[v2,1/3] cmake: drop CCACHE_COMPILERCHECK

This variable controls how ccache determines if the cache is valid or not
for a given compiler.

By default, ccache looks at the mtime of the compiler binary.

Signed-off-by: Ross Burton <ross.burton@arm.com>
---
 meta/classes/ccache.bbclass | 3 ---
 1 file changed, 3 deletions(-)

Note that I didn’t send 2/3 and 3/3 as they’re WIP patches and I didn’t mean to (almost) send them. This one is good.

Ross


> On 18 Jul 2025, at 16:10, Ross Burton via lists.openembedded.org <ross.burton=arm.com@lists.openembedded.org> wrote:
> 
> This variable controls how ccache determines if the cache is valid or not
> for a given compiler.
> 
> By default, ccache looks at the mtime of the compiler binary.
> 
> Signed-off-by: Ross Burton <ross.burton@arm.com>
> ---
> meta/classes/ccache.bbclass | 3 ---
> 1 file changed, 3 deletions(-)
> 
> diff --git a/meta/classes/ccache.bbclass b/meta/classes/ccache.bbclass
> index 01e9816c706..5ce23e50f34 100644
> --- a/meta/classes/ccache.bbclass
> +++ b/meta/classes/ccache.bbclass
> @@ -42,9 +42,6 @@ CCACHE_NATIVE_RECIPES_ALLOWED ?= ""
> # in different builds.
> export CCACHE_BASEDIR ?= "${TMPDIR}"
> 
> -# Used for sharing cache files after compiler is rebuilt
> -export CCACHE_COMPILERCHECK ?= "%compiler% -dumpspecs"
> -
> export CCACHE_CONFIGPATH ?= "${COREBASE}/meta/conf/ccache.conf"
> 
> export CCACHE_DIR ?= "${CCACHE_TOP_DIR}/${MULTIMACH_TARGET_SYS}/${PN}"
> -- 
> 2.43.0
> 
> 
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On Fri, Jul 18, 2025 at 8:10 AM Ross Burton via lists.openembedded.org
<ross.burton=arm.com@lists.openembedded.org> wrote:
>
> This variable controls how ccache determines if the cache is valid or not
> for a given compiler.
>
> By default, ccache looks at the mtime of the compiler binary.
>

this may become interesting when compiler binary is used from sstate
built on another machine, it might be identical binary
but mtime maybe different.

> Signed-off-by: Ross Burton <ross.burton@arm.com>
> ---
>  meta/classes/ccache.bbclass | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/meta/classes/ccache.bbclass b/meta/classes/ccache.bbclass
> index 01e9816c706..5ce23e50f34 100644
> --- a/meta/classes/ccache.bbclass
> +++ b/meta/classes/ccache.bbclass
> @@ -42,9 +42,6 @@ CCACHE_NATIVE_RECIPES_ALLOWED ?= ""
>  # in different builds.
>  export CCACHE_BASEDIR ?= "${TMPDIR}"
>
> -# Used for sharing cache files after compiler is rebuilt
> -export CCACHE_COMPILERCHECK ?= "%compiler% -dumpspecs"
> -
>  export CCACHE_CONFIGPATH ?= "${COREBASE}/meta/conf/ccache.conf"
>
>  export CCACHE_DIR ?= "${CCACHE_TOP_DIR}/${MULTIMACH_TARGET_SYS}/${PN}"
> --
> 2.43.0
>
>
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