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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2022-03-11 10:40:44 -0300 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2022-11-01 09:51:06 -0300 |
commit | 8d98c7c00f3f06545de9e5ce5cf778d2ab2450a4 (patch) | |
tree | 9fe2d950df8424164112464dfbb5ec906b279757 /configure.ac | |
parent | 5c5a8b99cf96b71940e36a9db66d3a61bc315016 (diff) | |
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configure: Use -Wno-ignored-attributes if compiler warns about multiple aliases
clang emits an warning when a double alias redirection is used, to warn
the the original symbol will be used even when weak definition is
overridden. However, this is a common pattern for weak_alias, where
multiple alias are set to same symbol.
Reviewed-by: Fangrui Song <maskray@google.com>
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 |