| Summary: | sys-libs/glibc-2.39-r6 -mfpmath=sse and -march=i686 don't go together | ||
|---|---|---|---|
| Product: | Gentoo Linux | Reporter: | Esteve Varela Colominas <esteve.varela> |
| Component: | Current packages | Assignee: | Gentoo Toolchain Maintainers <toolchain> |
| Status: | UNCONFIRMED --- | ||
| Severity: | normal | CC: | esteve.varela |
| Priority: | Normal | ||
| Version: | unspecified | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Package list: | Runtime testing required: | --- | |
| Attachments: |
config.log
build.log |
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Created attachment 899710 [details]
build.log
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Created attachment 899709 [details] config.log The following command on a multilib x86_64 toolchain will cause an error: $ gcc -m32 -march=i686 -mfpmath=sse -Werror -o /dev/null -c -xc - <<< 'int a(){}' cc1: error: SSE instruction set disabled, using 387 arithmetics [-Werror] cc1: all warnings being treated as errors This is executed in this ebuild, causing it to fail, due to a few uncommon circumstances. I'm cross-compiling glibc, using a toolchain targetting x86_64 multilib, but without an existing glibc in the sysroot directory. It should be noted that this doesn't seem to happen with crossdev, but I still think the ebuild is slightly incorrect. The default CFLAGS_x86 value from arch/amd64/make.defaults in the profile is "-m32 -mfpmath=sse". Not being able to link a binary means that the "do_compile_test" in sys-libs/glibc/glibc-2.39-r6.ebuild:355 fails. This causes the ebuild to append "-march=i686" to CFLAGS_x86. The glibc configure tests, in particular "checking for broken __attribute__((alias()))", add the "-Werror" flag. All combined, these cause the glibc build to fail unnecessarily. Currently there's two ways to tweak CFLAGS_x86 to make this initial build pass: I can either remove "-mfpmath=sse" or add "-msse" to the flags. I think I'd solve this issue by adding the "-msse" flag to CFLAGS_x86 in the glibc ebuild.