armv8/armv9: Avoid using -march when -mcpu is chosen

Current include logic goes into generic arm v8/v9 architecture tunes and
adds corresponding -march option after synthesizing it from various tune
fragments, this is fine for a machine which is using armv8/armv9 based
tunes but cortex tunes are intentionally using -mcpu option based on
selected tune value. So when cortex based default tune is selected for a
machine, it will add both -mcpu and -march to the compiler commandline
which can result in invalid combinations for this pair in gcc's own
logic. This can then result in compiler warnings/errors reporting this

e.g.

aarch64-yoe-linux-gcc  -mcpu=cortex-a72.cortex-a53 -march=armv8-a+crc+crypto -mbranch-protection=standard
...
cc1: error: switch '-mcpu=cortex-a72.cortex-a53' conflicts with '-march=armv8-a+crc+crypto' switch and resulted in options '+crc+crypto' being added [-Werror]

This is seen in lot of configure test results in glibc 2.39 and the
warning is promoted to errors by gcc in some of these checks especially
with gcc-14, the logs also show it as warning in other places in
configure checks.

mcpu option will compute relevant march implicitly as it specifies a cpu
implementation and this will be the right value to use, therefore do not
specify -march when -mcpu is already describing the cpu.

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Ross Burton <ross.burton@arm.com>
Cc: Jon Mason <jdmason@kudzu.us>
---
 meta/conf/machine/include/arm/armv8-1m/tune-cortexm55.inc      | 3 ++-
 meta/conf/machine/include/arm/armv8-2a/tune-cortexa55.inc      | 3 ++-
 meta/conf/machine/include/arm/armv8-2a/tune-cortexa65.inc      | 3 ++-
 meta/conf/machine/include/arm/armv8-2a/tune-cortexa65ae.inc    | 3 ++-
 .../machine/include/arm/armv8-2a/tune-cortexa75-cortexa55.inc  | 3 ++-
 meta/conf/machine/include/arm/armv8-2a/tune-cortexa75.inc      | 3 ++-
 .../machine/include/arm/armv8-2a/tune-cortexa76-cortexa55.inc  | 3 ++-
 meta/conf/machine/include/arm/armv8-2a/tune-cortexa76.inc      | 3 ++-
 meta/conf/machine/include/arm/armv8-2a/tune-cortexa76ae.inc    | 3 ++-
 meta/conf/machine/include/arm/armv8-2a/tune-cortexa77.inc      | 3 ++-
 meta/conf/machine/include/arm/armv8-2a/tune-neoversee1.inc     | 3 ++-
 meta/conf/machine/include/arm/armv8-2a/tune-octeontx2.inc      | 3 ++-
 meta/conf/machine/include/arm/armv8-m/tune-cortexm23.inc       | 3 ++-
 meta/conf/machine/include/arm/armv8-m/tune-cortexm33.inc       | 3 ++-
 meta/conf/machine/include/arm/armv8-m/tune-cortexm35p.inc      | 3 ++-
 meta/conf/machine/include/arm/armv8a/tune-cortexa32.inc        | 3 ++-
 meta/conf/machine/include/arm/armv8a/tune-cortexa34.inc        | 3 ++-
 meta/conf/machine/include/arm/armv8a/tune-cortexa35.inc        | 3 ++-
 meta/conf/machine/include/arm/armv8a/tune-cortexa53.inc        | 3 ++-
 .../machine/include/arm/armv8a/tune-cortexa57-cortexa53.inc    | 3 ++-
 meta/conf/machine/include/arm/armv8a/tune-cortexa57.inc        | 3 ++-
 .../machine/include/arm/armv8a/tune-cortexa72-cortexa53.inc    | 3 ++-
 meta/conf/machine/include/arm/armv8a/tune-cortexa72.inc        | 3 ++-
 .../machine/include/arm/armv8a/tune-cortexa73-cortexa35.inc    | 3 ++-
 .../machine/include/arm/armv8a/tune-cortexa73-cortexa53.inc    | 3 ++-
 meta/conf/machine/include/arm/armv8a/tune-cortexa73.inc        | 3 ++-
 meta/conf/machine/include/arm/armv8r/tune-cortexr52.inc        | 3 ++-
 meta/conf/machine/include/arm/armv9a/tune-neoversen2.inc       | 3 ++-
 28 files changed, 56 insertions(+), 28 deletions(-)

On Fri, Jan 26, 2024 at 03:31:41PM -0800, Khem Raj wrote:
> Current include logic goes into generic arm v8/v9 architecture tunes and
> adds corresponding -march option after synthesizing it from various tune
> fragments, this is fine for a machine which is using armv8/armv9 based
> tunes but cortex tunes are intentionally using -mcpu option based on
> selected tune value. So when cortex based default tune is selected for a
> machine, it will add both -mcpu and -march to the compiler commandline
> which can result in invalid combinations for this pair in gcc's own
> logic. This can then result in compiler warnings/errors reporting this
> 
> e.g.
> 
> aarch64-yoe-linux-gcc  -mcpu=cortex-a72.cortex-a53 -march=armv8-a+crc+crypto -mbranch-protection=standard
> ...
> cc1: error: switch '-mcpu=cortex-a72.cortex-a53' conflicts with '-march=armv8-a+crc+crypto' switch and resulted in options '+crc+crypto' being added [-Werror]
> 
> This is seen in lot of configure test results in glibc 2.39 and the
> warning is promoted to errors by gcc in some of these checks especially
> with gcc-14, the logs also show it as warning in other places in
> configure checks.
> 
> mcpu option will compute relevant march implicitly as it specifies a cpu
> implementation and this will be the right value to use, therefore do not
> specify -march when -mcpu is already describing the cpu.
> 
> Signed-off-by: Khem Raj <raj.khem@gmail.com>
> Cc: Ross Burton <ross.burton@arm.com>
> Cc: Jon Mason <jdmason@kudzu.us>

Looks good to me.

Reviewed-by: Jon Mason <jdmason@kudzu.us>

I have some coming that I'll need to tweak to match these.  So, expect
those soon.

Thanks,
Jon


> ---
>  meta/conf/machine/include/arm/armv8-1m/tune-cortexm55.inc      | 3 ++-
>  meta/conf/machine/include/arm/armv8-2a/tune-cortexa55.inc      | 3 ++-
>  meta/conf/machine/include/arm/armv8-2a/tune-cortexa65.inc      | 3 ++-
>  meta/conf/machine/include/arm/armv8-2a/tune-cortexa65ae.inc    | 3 ++-
>  .../machine/include/arm/armv8-2a/tune-cortexa75-cortexa55.inc  | 3 ++-
>  meta/conf/machine/include/arm/armv8-2a/tune-cortexa75.inc      | 3 ++-
>  .../machine/include/arm/armv8-2a/tune-cortexa76-cortexa55.inc  | 3 ++-
>  meta/conf/machine/include/arm/armv8-2a/tune-cortexa76.inc      | 3 ++-
>  meta/conf/machine/include/arm/armv8-2a/tune-cortexa76ae.inc    | 3 ++-
>  meta/conf/machine/include/arm/armv8-2a/tune-cortexa77.inc      | 3 ++-
>  meta/conf/machine/include/arm/armv8-2a/tune-neoversee1.inc     | 3 ++-
>  meta/conf/machine/include/arm/armv8-2a/tune-octeontx2.inc      | 3 ++-
>  meta/conf/machine/include/arm/armv8-m/tune-cortexm23.inc       | 3 ++-
>  meta/conf/machine/include/arm/armv8-m/tune-cortexm33.inc       | 3 ++-
>  meta/conf/machine/include/arm/armv8-m/tune-cortexm35p.inc      | 3 ++-
>  meta/conf/machine/include/arm/armv8a/tune-cortexa32.inc        | 3 ++-
>  meta/conf/machine/include/arm/armv8a/tune-cortexa34.inc        | 3 ++-
>  meta/conf/machine/include/arm/armv8a/tune-cortexa35.inc        | 3 ++-
>  meta/conf/machine/include/arm/armv8a/tune-cortexa53.inc        | 3 ++-
>  .../machine/include/arm/armv8a/tune-cortexa57-cortexa53.inc    | 3 ++-
>  meta/conf/machine/include/arm/armv8a/tune-cortexa57.inc        | 3 ++-
>  .../machine/include/arm/armv8a/tune-cortexa72-cortexa53.inc    | 3 ++-
>  meta/conf/machine/include/arm/armv8a/tune-cortexa72.inc        | 3 ++-
>  .../machine/include/arm/armv8a/tune-cortexa73-cortexa35.inc    | 3 ++-
>  .../machine/include/arm/armv8a/tune-cortexa73-cortexa53.inc    | 3 ++-
>  meta/conf/machine/include/arm/armv8a/tune-cortexa73.inc        | 3 ++-
>  meta/conf/machine/include/arm/armv8r/tune-cortexr52.inc        | 3 ++-
>  meta/conf/machine/include/arm/armv9a/tune-neoversen2.inc       | 3 ++-
>  28 files changed, 56 insertions(+), 28 deletions(-)
> 
> diff --git a/meta/conf/machine/include/arm/armv8-1m/tune-cortexm55.inc b/meta/conf/machine/include/arm/armv8-1m/tune-cortexm55.inc
> index 493ad67b21d..0a115be8a47 100644
> --- a/meta/conf/machine/include/arm/armv8-1m/tune-cortexm55.inc
> +++ b/meta/conf/machine/include/arm/armv8-1m/tune-cortexm55.inc
> @@ -10,5 +10,6 @@ require conf/machine/include/arm/arch-armv8-1m-main.inc
>  
>  AVAILTUNES                            += "cortexm55"
>  ARMPKGARCH:tune-cortexm55              = "cortexm55"
> -TUNE_FEATURES:tune-cortexm55           = "${TUNE_FEATURES:tune-armv8-1m-main} cortexm55"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexm55           = "cortexm55"
>  PACKAGE_EXTRA_ARCHS:tune-cortexm55     = "${PACKAGE_EXTRA_ARCHS:tune-armv8-1m-main} cortexm55"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa55.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa55.inc
> index d130b4b90ad..5e63b45ae0e 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa55.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa55.inc
> @@ -8,6 +8,7 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  # Little Endian base configs
>  AVAILTUNES += "cortexa55"
>  ARMPKGARCH:tune-cortexa55             = "cortexa55"
> -TUNE_FEATURES:tune-cortexa55          = "${TUNE_FEATURES:tune-armv8-2a-crypto} cortexa55"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa55          = "aarch64 crypto cortexa55"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa55    = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} cortexa55"
>  BASE_LIB:tune-cortexa55               = "lib64"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa65.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa65.inc
> index c7e86887b56..ba96d0452e2 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa65.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa65.inc
> @@ -11,6 +11,7 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  # Little Endian base configs
>  AVAILTUNES                                         += "cortexa65"
>  ARMPKGARCH:tune-cortexa65                           = "cortexa65"
> -TUNE_FEATURES:tune-cortexa65                        = "${TUNE_FEATURES:tune-armv8-2a-crypto} cortexa65"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa65                        = "aarch64 crypto cortexa65"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa65                  = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} cortexa65"
>  BASE_LIB:tune-cortexa65                             = "lib64"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa65ae.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa65ae.inc
> index dad6d1b174f..cc921474417 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa65ae.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa65ae.inc
> @@ -11,6 +11,7 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  # Little Endian base configs
>  AVAILTUNES                                         += "cortexa65ae"
>  ARMPKGARCH:tune-cortexa65ae                         = "cortexa65ae"
> -TUNE_FEATURES:tune-cortexa65ae                      = "${TUNE_FEATURES:tune-armv8-2a-crypto} cortexa65ae"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa65ae                      = "aarch64 crypto cortexa65ae"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa65ae                = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} cortexa65ae"
>  BASE_LIB:tune-cortexa65ae                           = "lib64"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75-cortexa55.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75-cortexa55.inc
> index 3a47e8278d2..e18b2cb6e0a 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75-cortexa55.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75-cortexa55.inc
> @@ -12,7 +12,8 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  AVAILTUNES                                         += "cortexa75-cortexa55 cortexa75-cortexa55-crypto"
>  ARMPKGARCH:tune-cortexa75-cortexa55                 = "cortexa75-cortexa55"
>  ARMPKGARCH:tune-cortexa75-cortexa55-crypto          = "cortexa75-cortexa55-crypto"
> -TUNE_FEATURES:tune-cortexa75-cortexa55              = "${TUNE_FEATURES:tune-armv8-2a} cortexa75-cortexa55"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa75-cortexa55              = "aarch64 cortexa75-cortexa55"
>  TUNE_FEATURES:tune-cortexa75-cortexa55-crypto       = "${TUNE_FEATURES:tune-cortexa75-cortexa55} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa75-cortexa55        = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a} cortexa75-cortexa55"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa75-cortexa55-crypto = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} cortexa75-cortexa55 cortexa75-cortexa55-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75.inc
> index 2d9a1159f1a..453be2e6fda 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75.inc
> @@ -11,6 +11,7 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  # Little Endian base configs
>  AVAILTUNES                                         += "cortexa75"
>  ARMPKGARCH:tune-cortexa75                           = "cortexa75"
> -TUNE_FEATURES:tune-cortexa75                        = "${TUNE_FEATURES:tune-armv8-2a-crypto} cortexa75"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa75                        = "aarch64 crypto cortexa75"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa75                  = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} cortexa75"
>  BASE_LIB:tune-cortexa75                             = "lib64"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76-cortexa55.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76-cortexa55.inc
> index f4c99ad6bbc..7daf9d91a8f 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76-cortexa55.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76-cortexa55.inc
> @@ -12,7 +12,8 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  AVAILTUNES                                         += "cortexa76-cortexa55 cortexa76-cortexa55-crypto"
>  ARMPKGARCH:tune-cortexa76-cortexa55                 = "cortexa76-cortexa55"
>  ARMPKGARCH:tune-cortexa76-cortexa55-crypto          = "cortexa76-cortexa55-crypto"
> -TUNE_FEATURES:tune-cortexa76-cortexa55              = "${TUNE_FEATURES:tune-armv8-2a} cortexa76-cortexa55"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa76-cortexa55              = "aarch64 cortexa76-cortexa55"
>  TUNE_FEATURES:tune-cortexa76-cortexa55-crypto       = "${TUNE_FEATURES:tune-cortexa76-cortexa55} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa76-cortexa55        = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a} cortexa76-cortexa55"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa76-cortexa55-crypto = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} cortexa76-cortexa55 cortexa76-cortexa55-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76.inc
> index 0dfdb8c5e48..14ed81214de 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76.inc
> @@ -11,6 +11,7 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  # Little Endian base configs
>  AVAILTUNES                                         += "cortexa76"
>  ARMPKGARCH:tune-cortexa76                           = "cortexa76"
> -TUNE_FEATURES:tune-cortexa76                        = "${TUNE_FEATURES:tune-armv8-2a-crypto} cortexa76"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa76                        = "aarch64 crypto cortexa76"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa76                  = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} cortexa76"
>  BASE_LIB:tune-cortexa76                             = "lib64"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76ae.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76ae.inc
> index b2863dca682..191863bac86 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76ae.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76ae.inc
> @@ -11,6 +11,7 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  # Little Endian base configs
>  AVAILTUNES                                         += "cortexa76ae"
>  ARMPKGARCH:tune-cortexa76ae                         = "cortexa76ae"
> -TUNE_FEATURES:tune-cortexa76ae                      = "${TUNE_FEATURES:tune-armv8-2a-crypto} cortexa76ae"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa76ae                      = "aarch64 crypto cortexa76ae"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa76ae                = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} cortexa76ae"
>  BASE_LIB:tune-cortexa76ae                           = "lib64"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa77.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa77.inc
> index 654b1f6323d..1522fd6abd9 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa77.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa77.inc
> @@ -11,6 +11,7 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  # Little Endian base configs
>  AVAILTUNES                                         += "cortexa77"
>  ARMPKGARCH:tune-cortexa77                           = "cortexa77"
> -TUNE_FEATURES:tune-cortexa77                        = "${TUNE_FEATURES:tune-armv8-2a-crypto} cortexa77"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa77                        = "aarch64 crypto cortexa77"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa77                  = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} cortexa77"
>  BASE_LIB:tune-cortexa77                             = "lib64"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-neoversee1.inc b/meta/conf/machine/include/arm/armv8-2a/tune-neoversee1.inc
> index 15ed595bdea..e906cf965cb 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-neoversee1.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-neoversee1.inc
> @@ -11,6 +11,7 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  # Little Endian base configs
>  AVAILTUNES                                         += "neoversee1"
>  ARMPKGARCH:tune-neoversee1                          = "neoversee1"
> -TUNE_FEATURES:tune-neoversee1                       = "${TUNE_FEATURES:tune-armv8-2a-crypto} neoversee1"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-neoversee1                       = "aarch64 crypto neoversee1"
>  PACKAGE_EXTRA_ARCHS:tune-neoversee1                 = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} neoversee1"
>  BASE_LIB:tune-neoversee1                            = "lib64"
> diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-octeontx2.inc b/meta/conf/machine/include/arm/armv8-2a/tune-octeontx2.inc
> index 2cac70ea525..e9d7a59c511 100644
> --- a/meta/conf/machine/include/arm/armv8-2a/tune-octeontx2.inc
> +++ b/meta/conf/machine/include/arm/armv8-2a/tune-octeontx2.inc
> @@ -8,6 +8,7 @@ require conf/machine/include/arm/arch-armv8-2a.inc
>  # Little Endian base configs
>  AVAILTUNES += "octeontx2"
>  ARMPKGARCH:tune-octeontx2             = "octeontx2"
> -TUNE_FEATURES:tune-octeontx2          = "${TUNE_FEATURES:tune-armv8-2a-crypto} octeontx2"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-octeontx2          = "aarch64 crypto octeontx2"
>  PACKAGE_EXTRA_ARCHS:tune-octeontx2    = "${PACKAGE_EXTRA_ARCHS:tune-armv8-2a-crypto} octeontx2"
>  BASE_LIB:tune-octeontx2               = "lib64"
> diff --git a/meta/conf/machine/include/arm/armv8-m/tune-cortexm23.inc b/meta/conf/machine/include/arm/armv8-m/tune-cortexm23.inc
> index 25780bc0802..e83e0ba68a7 100644
> --- a/meta/conf/machine/include/arm/armv8-m/tune-cortexm23.inc
> +++ b/meta/conf/machine/include/arm/armv8-m/tune-cortexm23.inc
> @@ -10,5 +10,6 @@ require conf/machine/include/arm/arch-armv8m-base.inc
>  
>  AVAILTUNES                          += "cortexm23"
>  ARMPKGARCH:tune-cortexm23            = "cortexm23"
> -TUNE_FEATURES:tune-cortexm23         = "${TUNE_FEATURES:tune-armv8m-base} cortexm23"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexm23         = "cortexm23"
>  PACKAGE_EXTRA_ARCHS:tune-cortexm23   = "${PACKAGE_EXTRA_ARCHS:tune-armv8m-base} cortexm23"
> diff --git a/meta/conf/machine/include/arm/armv8-m/tune-cortexm33.inc b/meta/conf/machine/include/arm/armv8-m/tune-cortexm33.inc
> index 04d1fe2bde8..606900d7a21 100644
> --- a/meta/conf/machine/include/arm/armv8-m/tune-cortexm33.inc
> +++ b/meta/conf/machine/include/arm/armv8-m/tune-cortexm33.inc
> @@ -13,5 +13,6 @@ require conf/machine/include/arm/arch-armv8m-main.inc
>  # be fixed in GCC
>  AVAILTUNES                          += "cortexm33"
>  ARMPKGARCH:tune-cortexm33            = "cortexm33"
> -TUNE_FEATURES:tune-cortexm33         = "${TUNE_FEATURES:tune-armv8m-maine-vfpv5spd16} cortexm33"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexm33         = "vfpv5spd16 dsp cortexm33"
>  PACKAGE_EXTRA_ARCHS:tune-cortexm33   = "${PACKAGE_EXTRA_ARCHS:tune-armv8m-maine-vfpv5spd16} cortexm33e-fpv5-spd16"
> diff --git a/meta/conf/machine/include/arm/armv8-m/tune-cortexm35p.inc b/meta/conf/machine/include/arm/armv8-m/tune-cortexm35p.inc
> index 60e978facdc..4394adab0b1 100644
> --- a/meta/conf/machine/include/arm/armv8-m/tune-cortexm35p.inc
> +++ b/meta/conf/machine/include/arm/armv8-m/tune-cortexm35p.inc
> @@ -13,5 +13,6 @@ require conf/machine/include/arm/arch-armv8m-main.inc
>  # be fixed in GCC
>  AVAILTUNES                          += "cortexm35p"
>  ARMPKGARCH:tune-cortexm35p           = "cortexm35p"
> -TUNE_FEATURES:tune-cortexm35p        = "${TUNE_FEATURES:tune-armv8m-maine-vfpv5spd16} cortexm35p"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexm35p        = "vfpv5spd16 dsp cortexm35p"
>  PACKAGE_EXTRA_ARCHS:tune-cortexm35p  = "${PACKAGE_EXTRA_ARCHS:tune-armv8m-maine-vfpv5spd16} cortexm35pe-fpv5-spd16"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa32.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa32.inc
> index c7b01a29065..25bdf12b185 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa32.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa32.inc
> @@ -9,7 +9,8 @@ require conf/machine/include/arm/arch-armv8a.inc
>  AVAILTUNES += "cortexa32 cortexa32-crypto"
>  ARMPKGARCH:tune-cortexa32             = "cortexa32"
>  ARMPKGARCH:tune-cortexa32-crypto      = "cortexa32"
> -TUNE_FEATURES:tune-cortexa32          = "armv8a cortexa32 crc callconvention-hard neon"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa32          = "aarch64 cortexa32 crc callconvention-hard neon"
>  TUNE_FEATURES:tune-cortexa32-crypto   = "${TUNE_FEATURES:tune-cortexa32} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa32             = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc} cortexa32 cortexa32hf-neon"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa32-crypto      = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc-crypto} cortexa32 cortexa32hf-neon cortexa32hf-neon-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa34.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa34.inc
> index 55dd845b005..c195d733784 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa34.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa34.inc
> @@ -12,7 +12,8 @@ require conf/machine/include/arm/arch-armv8a.inc
>  AVAILTUNES                                += "cortexa34 cortexa34-crypto"
>  ARMPKGARCH:tune-cortexa34                  = "cortexa34"
>  ARMPKGARCH:tune-cortexa34-crypto           = "cortexa34"
> -TUNE_FEATURES:tune-cortexa34               = "${TUNE_FEATURES:tune-armv8a-crc} cortexa34"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa34               = "aarch64 crc cortexa34"
>  TUNE_FEATURES:tune-cortexa34-crypto        = "${TUNE_FEATURES:tune-cortexa34} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa34         = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc} cortexa34"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa34-crypto  = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc-crypto} cortexa34 cortexa34-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa35.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa35.inc
> index 33afb193863..d811c84455c 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa35.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa35.inc
> @@ -9,7 +9,8 @@ require conf/machine/include/arm/arch-armv8a.inc
>  AVAILTUNES += "cortexa35 cortexa35-crypto"
>  ARMPKGARCH:tune-cortexa35             = "cortexa35"
>  ARMPKGARCH:tune-cortexa35-crypto      = "cortexa35"
> -TUNE_FEATURES:tune-cortexa35          = "${TUNE_FEATURES:tune-armv8a-crc} cortexa35"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa35          = "aarch64 crc cortexa35"
>  TUNE_FEATURES:tune-cortexa35-crypto   = "${TUNE_FEATURES:tune-cortexa35} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa35             = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc} cortexa35"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa35-crypto      = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc-crypto} cortexa35 cortexa35-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa53.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa53.inc
> index a534ad358d8..a88575eb156 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa53.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa53.inc
> @@ -9,7 +9,8 @@ require conf/machine/include/arm/arch-armv8a.inc
>  AVAILTUNES += "cortexa53 cortexa53-crypto"
>  ARMPKGARCH:tune-cortexa53             = "cortexa53"
>  ARMPKGARCH:tune-cortexa53-crypto      = "cortexa53-crypto"
> -TUNE_FEATURES:tune-cortexa53          = "${TUNE_FEATURES:tune-armv8a-crc} cortexa53"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa53          = "aarch64 crc cortexa53"
>  TUNE_FEATURES:tune-cortexa53-crypto   = "${TUNE_FEATURES:tune-cortexa53} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa53             = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc} cortexa53"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa53-crypto      = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc-crypto} cortexa53 cortexa53-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa57-cortexa53.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa57-cortexa53.inc
> index 7de671a2e5d..052d1173c9b 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa57-cortexa53.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa57-cortexa53.inc
> @@ -9,6 +9,7 @@ require conf/machine/include/arm/arch-armv8a.inc
>  # Little Endian base configs
>  AVAILTUNES += "cortexa57-cortexa53"
>  ARMPKGARCH:tune-cortexa57-cortexa53 = "cortexa57-cortexa53"
> -TUNE_FEATURES:tune-cortexa57-cortexa53 = "${TUNE_FEATURES:tune-armv8a-crc} cortexa57-cortexa53"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa57-cortexa53 = "aarch64 crc cortexa57-cortexa53"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa57-cortexa53 = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc} cortexa57-cortexa53"
>  BASE_LIB:tune-cortexa57-cortexa53 = "lib64"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa57.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa57.inc
> index 37650d8798c..b0de20f8369 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa57.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa57.inc
> @@ -9,7 +9,8 @@ require conf/machine/include/arm/arch-armv8a.inc
>  AVAILTUNES += "cortexa57 cortexa57-crypto"
>  ARMPKGARCH:tune-cortexa57             = "cortexa57"
>  ARMPKGARCH:tune-cortexa57-crypto      = "cortexa57-crypto"
> -TUNE_FEATURES:tune-cortexa57          = "${TUNE_FEATURES:tune-armv8a-crc} cortexa57"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa57          = "aarch64 crc cortexa57"
>  TUNE_FEATURES:tune-cortexa57-crypto   = "${TUNE_FEATURES:tune-cortexa57} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa57             = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc} cortexa57"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa57-crypto      = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc-crypto} cortexa57 cortexa57-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa72-cortexa53.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa72-cortexa53.inc
> index a77ef59d62d..ff188aec5fd 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa72-cortexa53.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa72-cortexa53.inc
> @@ -10,7 +10,8 @@ require conf/machine/include/arm/arch-armv8a.inc
>  AVAILTUNES += "cortexa72-cortexa53 cortexa72-cortexa53-crypto"
>  ARMPKGARCH:tune-cortexa72-cortexa53                  = "cortexa72-cortexa53"
>  ARMPKGARCH:tune-cortexa72-cortexa53-crypto           = "cortexa72-cortexa53-crypto"
> -TUNE_FEATURES:tune-cortexa72-cortexa53               = "${TUNE_FEATURES:tune-armv8a-crc} cortexa72-cortexa53"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa72-cortexa53               = "aarch64 crc cortexa72-cortexa53"
>  TUNE_FEATURES:tune-cortexa72-cortexa53-crypto        = "${TUNE_FEATURES:tune-cortexa72-cortexa53} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa72-cortexa53         = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc}        cortexa72-cortexa53"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa72-cortexa53-crypto  = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc-crypto} cortexa72-cortexa53 cortexa72-cortexa53-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa72.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa72.inc
> index b0a017e444b..cbb6418c069 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa72.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa72.inc
> @@ -9,7 +9,8 @@ require conf/machine/include/arm/arch-armv8a.inc
>  AVAILTUNES += "cortexa72 cortexa72-crypto"
>  ARMPKGARCH:tune-cortexa72             = "cortexa72"
>  ARMPKGARCH:tune-cortexa72-crypto      = "cortexa72"
> -TUNE_FEATURES:tune-cortexa72          = "${TUNE_FEATURES:tune-armv8a-crc} cortexa72"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa72          = "aarch64 crc cortexa72"
>  TUNE_FEATURES:tune-cortexa72-crypto   = "${TUNE_FEATURES:tune-cortexa72} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa72        = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc} cortexa72"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa72-crypto = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc-crypto} cortexa72 cortexa72-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa73-cortexa35.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa73-cortexa35.inc
> index 869670bf0cf..4f4f25f5119 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa73-cortexa35.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa73-cortexa35.inc
> @@ -13,7 +13,8 @@ require conf/machine/include/arm/arch-armv8a.inc
>  AVAILTUNES                                          += "cortexa73-cortexa35 cortexa73-cortexa35-crypto"
>  ARMPKGARCH:tune-cortexa73-cortexa35                  = "cortexa73-cortexa35"
>  ARMPKGARCH:tune-cortexa73-cortexa35-crypto           = "cortexa73-cortexa35-crypto"
> -TUNE_FEATURES:tune-cortexa73-cortexa35               = "${TUNE_FEATURES:tune-armv8a-crc} cortexa73-cortexa35"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa73-cortexa35               = "aarch64 crc cortexa73-cortexa35"
>  TUNE_FEATURES:tune-cortexa73-cortexa35-crypto        = "${TUNE_FEATURES:tune-cortexa73-cortexa35} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa73-cortexa35         = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc} cortexa73-cortexa35"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa73-cortexa35-crypto  = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc-crypto} cortexa73-cortexa35 cortexa73-cortexa35-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa73-cortexa53.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa73-cortexa53.inc
> index 9cebffd54dd..1d152ed83bf 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa73-cortexa53.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa73-cortexa53.inc
> @@ -10,7 +10,8 @@ require conf/machine/include/arm/arch-armv8a.inc
>  AVAILTUNES += "cortexa73-cortexa53 cortexa73-cortexa53-crypto"
>  ARMPKGARCH:tune-cortexa73-cortexa53                  = "cortexa73-cortexa53"
>  ARMPKGARCH:tune-cortexa73-cortexa53-crypto           = "cortexa73-cortexa53-crypto"
> -TUNE_FEATURES:tune-cortexa73-cortexa53               = "${TUNE_FEATURES:tune-armv8a-crc} cortexa73-cortexa53"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa73-cortexa53               = "aarch64 crc cortexa73-cortexa53"
>  TUNE_FEATURES:tune-cortexa73-cortexa53-crypto        = "${TUNE_FEATURES:tune-cortexa73-cortexa53} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa73-cortexa53         = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc}        cortexa73-cortexa53"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa73-cortexa53-crypto  = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc-crypto} cortexa73-cortexa53 cortexa73-cortexa53-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8a/tune-cortexa73.inc b/meta/conf/machine/include/arm/armv8a/tune-cortexa73.inc
> index 13876e72459..b3b06a4f09f 100644
> --- a/meta/conf/machine/include/arm/armv8a/tune-cortexa73.inc
> +++ b/meta/conf/machine/include/arm/armv8a/tune-cortexa73.inc
> @@ -12,7 +12,8 @@ require conf/machine/include/arm/arch-armv8a.inc
>  AVAILTUNES                                += "cortexa73 cortexa73-crypto"
>  ARMPKGARCH:tune-cortexa73                  = "cortexa73"
>  ARMPKGARCH:tune-cortexa73-crypto           = "cortexa73"
> -TUNE_FEATURES:tune-cortexa73               = "${TUNE_FEATURES:tune-armv8a-crc} cortexa73"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexa73               = "aarch64 crc cortexa73"
>  TUNE_FEATURES:tune-cortexa73-crypto        = "${TUNE_FEATURES:tune-cortexa73} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa73         = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc} cortexa73"
>  PACKAGE_EXTRA_ARCHS:tune-cortexa73-crypto  = "${PACKAGE_EXTRA_ARCHS:tune-armv8a-crc-crypto} cortexa73 cortexa73-crypto"
> diff --git a/meta/conf/machine/include/arm/armv8r/tune-cortexr52.inc b/meta/conf/machine/include/arm/armv8r/tune-cortexr52.inc
> index 3a97cf8ee82..02507d9b78a 100644
> --- a/meta/conf/machine/include/arm/armv8r/tune-cortexr52.inc
> +++ b/meta/conf/machine/include/arm/armv8r/tune-cortexr52.inc
> @@ -10,5 +10,6 @@ require conf/machine/include/arm/arch-armv8r.inc
>  
>  AVAILTUNES                             += "cortexr52"
>  ARMPKGARCH:tune-cortexr52               = "cortexr52"
> -TUNE_FEATURES:tune-cortexr52            = "${TUNE_FEATURES:tune-armv8r-crc-simd} cortexr52"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-cortexr52            = "aarch64 crc simd cortexr52"
>  PACKAGE_EXTRA_ARCHS:tune-cortexr52      = "${PACKAGE_EXTRA_ARCHS:tune-armv8r-crc-simd} cortexr52"
> diff --git a/meta/conf/machine/include/arm/armv9a/tune-neoversen2.inc b/meta/conf/machine/include/arm/armv9a/tune-neoversen2.inc
> index d26ab25e48f..ad60a3c9f39 100644
> --- a/meta/conf/machine/include/arm/armv9a/tune-neoversen2.inc
> +++ b/meta/conf/machine/include/arm/armv9a/tune-neoversen2.inc
> @@ -12,7 +12,8 @@ require conf/machine/include/arm/arch-armv9a.inc
>  AVAILTUNES                                         += "neoversen2 neoversen2-crypto"
>  ARMPKGARCH:tune-neoversen2                          = "neoversen2"
>  ARMPKGARCH:tune-neoversen2-crypto                   = "neoversen2-crypto"
> -TUNE_FEATURES:tune-neoversen2                       = "${TUNE_FEATURES:tune-armv9a} neoversen2"
> +# We do not want -march since -mcpu is added above to cover for it
> +TUNE_FEATURES:tune-neoversen2                       = "aarch64 neoversen2"
>  TUNE_FEATURES:tune-neoversen2-crypto                = "${TUNE_FEATURES:tune-neoversen2} crypto"
>  PACKAGE_EXTRA_ARCHS:tune-neoversen2                 = "${PACKAGE_EXTRA_ARCHS:tune-armv9a} neoversen2"
>  PACKAGE_EXTRA_ARCHS:tune-neoversen2-crypto          = "${PACKAGE_EXTRA_ARCHS:tune-armv9a-crypto} neoversen2 neoversen2-crypto"
> -- 
> 2.43.0
> 
>

On Sat, Jan 27, 2024 at 12:31 AM Khem Raj <raj.khem@gmail.com> wrote:

> Current include logic goes into generic arm v8/v9 architecture tunes and
> adds corresponding -march option after synthesizing it from various tune
> fragments, this is fine for a machine which is using armv8/armv9 based
> tunes but cortex tunes are intentionally using -mcpu option based on
> selected tune value. So when cortex based default tune is selected for a
> machine, it will add both -mcpu and -march to the compiler commandline
> which can result in invalid combinations for this pair in gcc's own
> logic. This can then result in compiler warnings/errors reporting this
>
> e.g.
>
> aarch64-yoe-linux-gcc  -mcpu=cortex-a72.cortex-a53
> -march=armv8-a+crc+crypto -mbranch-protection=standard
> ...
> cc1: error: switch '-mcpu=cortex-a72.cortex-a53' conflicts with
> '-march=armv8-a+crc+crypto' switch and resulted in options '+crc+crypto'
> being added [-Werror]
>
> This is seen in lot of configure test results in glibc 2.39 and the
> warning is promoted to errors by gcc in some of these checks especially
> with gcc-14, the logs also show it as warning in other places in
> configure checks.
>
> mcpu option will compute relevant march implicitly as it specifies a cpu
> implementation and this will be the right value to use, therefore do not
> specify -march when -mcpu is already describing the cpu.
>

I agree that keeping mapping between mcpu and march is tricky.

Just in case someone else hits similar issue, here is one new failure
caused by this change.

It is reproducible in xnnpack, it used to build with:
-march=armv8-a+crc and then -march=armv8.2-a+fp16+dotprod added by xnnpack
source
while with this change it ends with:
-mcpu=cortex-a72+crc and -march=armv8.2-a+fp16+dotprod
actually causing the issue you were trying to avoid, because tensorflow has
in some cases different expectations that what is set in TUNE_CCARGS and
needs to be fixed in tensorflow or worked around in metadata as before with:
https://github.com/webosose/meta-webosose/blob/master/meta-webos/recipes-upstreamable/xnnpack/xnnpack.bb#L70

which will need to be extended to avoid:
FAILED:
CMakeFiles/all_microkernels.dir/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S.o

TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/recipe-sysroot-native/usr/bin/aarch64-webos-linux/aarch64-webos-linux-gcc
--sysroot=TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/recipe-sysroot
-DFXDIV_USE_INLINE_ASSEMBLY=0 -DXNN_ENABLE_ARM_BF16=1
-DXNN_ENABLE_ARM_DOTPROD=1 -DXNN_ENABLE_ARM_FP16=1 -DXNN_ENABLE_ASSEMBLY=1
-DXNN_ENABLE_GEMM_M_SPECIALIZATION=1 -DXNN_ENABLE_JIT=0
-DXNN_ENABLE_MEMOPT=1 -DXNN_ENABLE_SPARSE=1
-ITOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src
-ITOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/pthreadpool-source/include
-ITOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/FXdiv-source/include
-ITOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/FP16-source/include
-mcpu=cortex-a72+crc -mbranch-protection=standard -fstack-protector-strong
 -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security
-Werror=return-type
 --sysroot=TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/recipe-sysroot
 -O2 -pipe -g -feliminate-unused-debug-types -fcanon-prefix-map
 -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git=/usr/src/debug/xnnpack/475884903
 -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git=/usr/src/debug/xnnpack/475884903
 -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/build=/usr/src/debug/xnnpack/475884903
 -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/build=/usr/src/debug/xnnpack/475884903
 -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/recipe-sysroot=
 -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/recipe-sysroot=
 -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/recipe-sysroot-native=
 -Wno-psabi -pthread  -fno-math-errno  -march=armv8.2-a+fp16+dotprod  -O2
-MD -MT
CMakeFiles/all_microkernels.dir/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S.o
-MF
CMakeFiles/all_microkernels.dir/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S.o.d
-o
CMakeFiles/all_microkernels.dir/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S.o
-c
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S
cc1: warning: switch '-mcpu=cortex-a72+crc' conflicts with
'-march=armv8.2-a+fp16+dotprod' switch
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:
Assembler messages:
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:64:
Error: selected processor does not support `fmla v16.8h,v20.8h,v0.h[0]'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:65:
Error: selected processor does not support `fmla v17.8h,v21.8h,v0.h[0]'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:66:
Error: selected processor does not support `fmla v18.8h,v22.8h,v0.h[1]'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:67:
Error: selected processor does not support `fmla v19.8h,v23.8h,v0.h[1]'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:75:
Error: selected processor does not support `fadd v16.8h,v16.8h,v18.8h'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:76:
Error: selected processor does not support `fadd v17.8h,v17.8h,v19.8h'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:80:
Error: selected processor does not support `fmax v16.8h,v16.8h,v4.8h'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:81:
Error: selected processor does not support `fmax v17.8h,v17.8h,v4.8h'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:82:
Error: selected processor does not support `fmin v16.8h,v16.8h,v5.8h'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:83:
Error: selected processor does not support `fmin v17.8h,v17.8h,v5.8h'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:102:
Error: selected processor does not support `fmla v16.8h,v20.8h,v0.h[0]'
TOPDIR/BUILD/work/raspberrypi4_64-webos-linux/xnnpack/475884903/git/src/f16-gemm/gen-inc/1x16inc-minmax-aarch64-neonfp16arith-ld32.S:103:
Error: selected processor does not support `fmla v17.8h,v21.8h,v0.h[0]'