diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index c5c4b383a3..9fc1fb1c1c 100644 --- a/configure.ac +++ b/configure.ac @@ -1404,6 +1404,28 @@ rm -f conftest*]) AC_SUBST(libc_cv_mtls_dialect_gnu2) LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2]) +dnl clang emits an warning for a double alias redirection, to warn the +dnl original symbol is sed even when weak definition overriddes it. +dnl It is a usual pattern for weak_alias, where multiple alias point to +dnl same symbol. +AC_CACHE_CHECK([if -Wno-ignored-attributes is required for aliases], + libc_cv_wno_ignored_attributes, [dnl +cat > conftest.c <<EOF +void __foo (void) +{ +} +extern __typeof (__foo) foo __attribute__ ((weak, alias ("__foo"))); +extern __typeof (__foo) bar __attribute__ ((weak, alias ("foo"))); +EOF +libc_cv_wno_ignored_attributes="" +if ! AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -Werror -c conftest.c]) +then + libc_cv_wno_ignored_attributes="-Wno-ignored-attributes" +fi +rm -f conftest*]) +LIBC_CONFIG_VAR([config-cflags-wno-ignored-attributes], + [$libc_cv_wno_ignored_attributes]) + AC_CACHE_CHECK(whether cc puts quotes around section names, libc_cv_have_section_quotes, [cat > conftest.c <<EOF |