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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-10-10 11:12:50 -0300 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-10-20 16:54:27 -0200 |
commit | 8f6f5362727dc93360fe37e6d4e964f386b7b8e7 (patch) | |
tree | 4def4f88d147070f708b932a97a195297deccd56 /sysdeps/powerpc/tst-tlsifunc.c | |
parent | fe05e1cb6d64dba6172249c79526f1e9af8f2bfd (diff) | |
download | glibc-8f6f5362727dc93360fe37e6d4e964f386b7b8e7.tar.gz glibc-8f6f5362727dc93360fe37e6d4e964f386b7b8e7.tar.xz glibc-8f6f5362727dc93360fe37e6d4e964f386b7b8e7.zip |
Avoid build multiarch if compiler warns about mismatched alias
GCC 8 emits an warning for alias for functions with incompatible types and it is used extensivelly for ifunc resolvers implementations in C (for instance on weak_alias with the internal symbol name to the external one or with the libc_hidden_def to set ifunc for internal usage). This breaks the build when the ifunc resolver is not defined using gcc attribute extensions (HAVE_GCC_IFUNC being 0). Although for all currently architectures that have multiarch support this compiler options is enabled for default, there is still the option where the user might try build glibc with a compiler without support for such extension. In this case this patch just disable the multiarch folder in sysdeps selections. GCC 7 and before still builds IFUNCs regardless of compiler support (although for the lack of attribute support debug information would be optimal). Checked with a build on multiarch support architectures (aarch64, arm, sparc, s390, powerpc, x86_64, i386) with multiarch enable and disable and with GCC 7 and GCC 8. * configure.ac (libc_cv_gcc_incompatbile_alias): New define: indicates whether compiler emits an warning for alias for functions with incompatible types.
Diffstat (limited to 'sysdeps/powerpc/tst-tlsifunc.c')
0 files changed, 0 insertions, 0 deletions