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| author | Florian Weimer <fweimer@redhat.com> | 2019-12-03 18:48:18 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2019-12-03 18:48:18 +0100 |
| commit | 9fb8139079ef0bb1aa33a4ae418cbb113b9b9da7 (patch) | |
| tree | 0a48018fcd1d381c1a5f8bcfc2e0101fbd67c31e /configure.ac | |
| parent | 39c977b23e3e547e70d199a679b37bdf9c3223f6 (diff) | |
| download | glibc-9fb8139079ef0bb1aa33a4ae418cbb113b9b9da7.tar.gz | |
x86: Assume --enable-cet if GCC defaults to CET [BZ #25225]
This links in CET support if GCC defaults to CET. Otherwise, __CET__
is defined, yet CET functionality is not compiled and linked into the
dynamic loader, resulting in a linker failure due to undefined
references to _dl_cet_check and _dl_open_check.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index e69c88c543..49b900c1ed 100644 --- a/configure.ac +++ b/configure.ac @@ -473,11 +473,18 @@ AC_ARG_ENABLE([mathvec], [build_mathvec=$enableval], [build_mathvec=notset]) +AC_TRY_COMPILE([], [ +#ifndef __CET__ +# error no CET compiler support +#endif], + [libc_cv_compiler_default_cet=yes], + [libc_cv_compiler_default_cet=no]) + AC_ARG_ENABLE([cet], AC_HELP_STRING([--enable-cet], [enable Intel Control-flow Enforcement Technology (CET), x86 only]), [enable_cet=$enableval], - [enable_cet=no]) + [enable_cet=$libc_cv_compiler_default_cet]) # We keep the original values in `$config_*' and never modify them, so we # can write them unchanged into config.make. Everything else uses |