[2/3] llvm-tblgen-native: add new recipe

Building the LLVM projects often means using the TableGen tools
(llvm-tblgen etc).

We currently build them as part of clang-native, but I am teasing the
clang recipe into its component parts and having to build llvm-native
or lldb-native simply for one tool isn't ideal.

Instead, add a native recipe that simply builds the tablegen binaries
for llvm, clang, and lldb
---
 meta/conf/distro/include/maintainers.inc      |  1 +
 meta/recipes-devtools/clang/clang_git.bb      | 10 +++----
 .../clang/llvm-tblgen-native_git.bb           | 27 +++++++++++++++++++
 3 files changed, 32 insertions(+), 6 deletions(-)
 create mode 100644 meta/recipes-devtools/clang/llvm-tblgen-native_git.bb

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---
Testing patch /home/patchtest/share/mboxes/2-3-llvm-tblgen-native-add-new-recipe.patch

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---

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On 7/11/25 8:51 AM, Ross Burton via lists.openembedded.org wrote:
> Building the LLVM projects often means using the TableGen tools
> (llvm-tblgen etc).
> 
> We currently build them as part of clang-native, but I am teasing the
> clang recipe into its component parts and having to build llvm-native
> or lldb-native simply for one tool isn't ideal.
> 
> Instead, add a native recipe that simply builds the tablegen binaries
> for llvm, clang, and lldb
> ---
>   meta/conf/distro/include/maintainers.inc      |  1 +
>   meta/recipes-devtools/clang/clang_git.bb      | 10 +++----
>   .../clang/llvm-tblgen-native_git.bb           | 27 +++++++++++++++++++
>   3 files changed, 32 insertions(+), 6 deletions(-)
>   create mode 100644 meta/recipes-devtools/clang/llvm-tblgen-native_git.bb
> 
> diff --git a/meta/conf/distro/include/maintainers.inc b/meta/conf/distro/include/maintainers.inc
> index 60f04da6089..331c438fd67 100644
> --- a/meta/conf/distro/include/maintainers.inc
> +++ b/meta/conf/distro/include/maintainers.inc
> @@ -480,6 +480,7 @@ RECIPE_MAINTAINER:pn-linux-yocto-dev = "Bruce Ashfield <bruce.ashfield@gmail.com
>   RECIPE_MAINTAINER:pn-linux-yocto-rt = "Bruce Ashfield <bruce.ashfield@gmail.com>"
>   RECIPE_MAINTAINER:pn-linux-yocto-tiny = "Bruce Ashfield <bruce.ashfield@gmail.com>"
>   RECIPE_MAINTAINER:pn-llvm-project-source-20.1.7 = "Khem Raj <raj.khem@gmail.com>"
> +RECIPE_MAINTAINER:pn-llvm-tblgen-native = "Khem Raj <raj.khem@gmail.com>"
>   RECIPE_MAINTAINER:pn-logrotate = "Yi Zhao <yi.zhao@windriver.com>"
>   RECIPE_MAINTAINER:pn-log4cplus = "Unassigned <unassigned@yoctoproject.org>"
>   RECIPE_MAINTAINER:pn-lrzsz = "Anuj Mittal <anuj.mittal@intel.com>"
> diff --git a/meta/recipes-devtools/clang/clang_git.bb b/meta/recipes-devtools/clang/clang_git.bb
> index 2b5d3a27524..0f1b950cc63 100644
> --- a/meta/recipes-devtools/clang/clang_git.bb
> +++ b/meta/recipes-devtools/clang/clang_git.bb
> @@ -207,7 +207,7 @@ EXTRA_OECMAKE:append:class-target = "\
>                     -DLLDB_PYTHON_EXT_SUFFIX=${SOLIBSDEV} \
>   "
>   
> -DEPENDS = "binutils zlib zstd libffi libxml2 libxml2-native ninja-native swig-native spirv-tools-native"
> +DEPENDS = "binutils zlib zstd libffi libxml2 libxml2-native ninja-native swig-native spirv-tools-native llvm-tblgen-native"
>   DEPENDS:append:class-nativesdk = " clang-crosssdk-${SDK_SYS} virtual/nativesdk-cross-binutils nativesdk-python3"
>   DEPENDS:append:class-target = " clang-cross-${TARGET_ARCH} python3 ${@bb.utils.contains('TC_CXX_RUNTIME', 'llvm', 'compiler-rt libcxx', '', d)} spirv-llvm-translator-native"
>   
> @@ -276,18 +276,16 @@ do_install:append:class-native () {
>           install -Dm 0755 ${B}${BINPATHPREFIX}/bin/clangd-indexer ${D}${bindir}/clangd-indexer
>       fi
>       install -Dm 0755 ${B}${BINPATHPREFIX}/bin/clang-tidy-confusable-chars-gen ${D}${bindir}/clang-tidy-confusable-chars-gen
> -    install -Dm 0755 ${B}${BINPATHPREFIX}/bin/clang-tblgen ${D}${bindir}/clang-tblgen
> -    install -Dm 0755 ${B}${BINPATHPREFIX}/bin/lldb-tblgen ${D}${bindir}/lldb-tblgen
> -    install -Dm 0755 ${B}${BINPATHPREFIX}/bin/llvm-min-tblgen ${D}${bindir}/llvm-min-tblgen

they are not installed but They are still being built internally I 
suppose ? in that case I wonder if it can use the binaries from 
llvm-tblgen-native during build and we can disable them from build in 
clang-native explicitly, should save some more time

>       install -Dm 0755 ${B}${BINPATHPREFIX}/bin/prepare_builtins ${D}${bindir}/prepare_builtins
>   
>       for f in `find ${D}${bindir} -executable -type f -not -type l`; do
>           test -n "`file -b $f|grep -i ELF`" && ${STRIP} $f
>           echo "stripped $f"
>       done
> -    ln -sf clang-tblgen ${D}${bindir}/clang-tblgen${PV}
> -    ln -sf llvm-tblgen ${D}${bindir}/llvm-tblgen${PV}
>       ln -sf llvm-config ${D}${bindir}/llvm-config${PV}
> +
> +    # These are provided by llvm-tblgen-native
> +    rm ${D}${bindir}/*-tblgen
>   }
>   
>   do_install:append:class-nativesdk () {
> diff --git a/meta/recipes-devtools/clang/llvm-tblgen-native_git.bb b/meta/recipes-devtools/clang/llvm-tblgen-native_git.bb
> new file mode 100644
> index 00000000000..be04c1aa4d1
> --- /dev/null
> +++ b/meta/recipes-devtools/clang/llvm-tblgen-native_git.bb
> @@ -0,0 +1,27 @@
> +SUMMARY = "LLVM TableGen binaries, for the build host"
> +SECTION = "devel"
> +
> +# Building the LLVM projects often means using the TableGen tools (llvm-tblgen,
> +# etc). We could build these as part of llvm-native, but there are cases where
> +# this would be overkill. For example, building a target LLDB needs native
> +# tablegen binaries and a target libllvm so having to build a complete native
> +# llvm is not needed.
> +
> +require common-clang.inc
> +require common-source.inc
> +
> +inherit cmake pkgconfig native
> +
> +OECMAKE_SOURCEPATH = "${S}/llvm"
> +
> +EXTRA_OECMAKE += "-DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS='llvm;clang;lldb'"
> +
> +BINARIES = "llvm-min-tblgen llvm-tblgen clang-tblgen lldb-tblgen"
> +
> +OECMAKE_TARGET_COMPILE = "${BINARIES}"
> +
> +do_install() {
> +    for f in ${BINARIES}; do
> +        install -D ${B}/bin/$f ${D}${bindir}/$f
> +    done
> +}
> 
> 
> 
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On 11 Jul 2025, at 17:35, Khem Raj <raj.khem@gmail.com> wrote:
>>      install -Dm 0755 ${B}${BINPATHPREFIX}/bin/clang-tidy-confusable-chars-gen ${D}${bindir}/clang-tidy-confusable-chars-gen
>> -    install -Dm 0755 ${B}${BINPATHPREFIX}/bin/clang-tblgen ${D}${bindir}/clang-tblgen
>> -    install -Dm 0755 ${B}${BINPATHPREFIX}/bin/lldb-tblgen ${D}${bindir}/lldb-tblgen
>> -    install -Dm 0755 ${B}${BINPATHPREFIX}/bin/llvm-min-tblgen ${D}${bindir}/llvm-min-tblgen
> 
> they are not installed but They are still being built internally I suppose ? in that case I wonder if it can use the binaries from llvm-tblgen-native during build and we can disable them from build in clang-native explicitly, should save some more time

Annoyingly, the native build does build its own copies even though I’ve told it where to find existing binaries.  Probably some quirk or another argument needed, feel free to figure out what I’m missing ;)

Ross