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commit: e61ffcd622d34570b294e7f4a3e922bdc980cd65 |
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Author: Marek Behún <kabel <AT> kernel <DOT> org> |
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AuthorDate: Thu Aug 18 18:01:58 2022 +0000 |
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Commit: Sam James <sam <AT> gentoo <DOT> org> |
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CommitDate: Tue Aug 23 05:23:56 2022 +0000 |
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URL: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=e61ffcd6 |
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|
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toolchain.eclass: build multilibs for ARM's A, R and M architecture profiles |
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|
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For ARM targets, with USE=multilib and with CTARGET that does not imply |
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any of --with-arch, --with-cpu, --with-mode or --with-float options to |
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gcc's configuration (when arm_arch=arm), pass option |
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--with-multilib-list=aprofile,rmprofile to gcc's configuration to make |
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it build multilibs for A, R and M architecture profiles. |
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|
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This makes it possible to have one compiler capable of generating |
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correct code (linking correct libgcc/CRT) for various ARM targets: from |
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armv6 to armv7, for both soft float and half float, for various FPU |
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types. |
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|
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Example of arm-none-eabi-gcc -print-libgcc-file-name output for various |
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options: |
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default: |
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/usr/lib/gcc/arm-none-eabi/12.1.1/libgcc.a |
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-mcpu=cortex-m0 |
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/usr/lib/gcc/arm-none-eabi/12.1.1/thumb/v6-m/nofp/libgcc.a |
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-march=armv7-m |
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/usr/lib/gcc/arm-none-eabi/12.1.1/thumb/v7-m/nofp/libgcc.a |
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-march=armv7-a |
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/usr/lib/gcc/arm-none-eabi/12.1.1/thumb/v7-a/nofp/libgcc.a |
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-march=armv7-a -mhard-float -mfpu=neon |
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/usr/lib/gcc/arm-none-eabi/12.1.1/thumb/v7-a+simd/hard/libgcc.a |
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-march=armv7-a -mhard-float -mfpu=vfp |
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/usr/lib/gcc/arm-none-eabi/12.1.1/thumb/v7-a+fp/hard/libgcc.a |
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|
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Signed-off-by: Marek Behún <kabel <AT> kernel.org> |
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Signed-off-by: Sam James <sam <AT> gentoo.org> |
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|
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eclass/toolchain.eclass | 11 +++++++++++ |
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1 file changed, 11 insertions(+) |
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|
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diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass |
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index ed473e0c626f..29076efc3f54 100644 |
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--- a/eclass/toolchain.eclass |
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+++ b/eclass/toolchain.eclass |
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@@ -1213,6 +1213,17 @@ toolchain_src_configure() { |
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armv7*) confgcc+=( --with-fpu=vfpv3-d16 ) ;; |
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esac |
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fi |
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+ |
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+ # If multilib is used, make the compiler build multilibs |
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+ # for A or R and M architecture profiles. Do this only |
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+ # when no specific arch/mode/float is specified, e.g. |
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+ # for target arm-none-eabi, since doing this is |
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+ # incompatible with --with-arch/cpu/float/fpu. |
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+ if is_multilib && [[ ${arm_arch} == arm ]] && \ |
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+ tc_version_is_at_least 7.1 |
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+ then |
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+ confgcc+=( --with-multilib-list=aprofile,rmprofile ) |
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+ fi |
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;; |
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mips) |
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# Add --with-abi flags to set default ABI |
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