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configure: Use -Wno-ignored-attributes if compiler warns about multiple aliases

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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.  Howerver, this is a common pattern for weak_alias, where
multiple alias are set to same symbol.
This commit is contained in:
Adhemerval Zanella 2022-03-11 10:40:44 -03:00
parent 5bcc666d76
commit 66a42a7099
4 changed files with 63 additions and 0 deletions
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30
configure vendored
View File

@ -7096,6 +7096,36 @@ printf "%s\n" "$libc_cv_wno_maybe_uninitialized" >&6; }
config_vars="$config_vars
config-cflags-wno-maybe-uninitialized = $libc_cv_wno_maybe_uninitialized"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if -Wno-ignored-attributes is required for aliases" >&5
printf %s "checking if -Wno-ignored-attributes is required for aliases... " >&6; }
if test ${libc_cv_wno_ignored_attributes+y}
then :
printf %s "(cached) " >&6
else $as_nop
cat > conftest.c <<EOF
void __foo (void)
{
}
extern __typeof (__foo) foo __attribute__ ((weak, alias ("__foo")));
extern __typeof (__foo) bar __attribute__ ((weak, alias ("foo")));
EOF
libc_cv_wno_ignored_attributes=""
if ! { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -Werror -c conftest.c'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }
then
libc_cv_wno_ignored_attributes="-Wno-ignored-attributes"
fi
rm -f conftest*
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_wno_ignored_attributes" >&5
printf "%s\n" "$libc_cv_wno_ignored_attributes" >&6; }
config_vars="$config_vars
config-cflags-wno-ignored-attributes = $libc_cv_wno_ignored_attributes"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether cc puts quotes around section names" >&5
printf %s "checking whether cc puts quotes around section names... " >&6; }
if test ${libc_cv_have_section_quotes+y}

22
configure.ac
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@ -1340,6 +1340,28 @@ AC_CACHE_CHECK([for -Wno-maybe-uninitialized], libc_cv_wno_maybe_uninitialized,
LIBC_CONFIG_VAR([config-cflags-wno-maybe-uninitialized],
[$libc_cv_wno_maybe_uninitialized])
dnl clang emits an warning when a double alias redirection is used, to warn
dnl the the original symbol will be used even when weak definition is overridden.
dnl This is a common pattern for weak_alias, where multiple alias are set to
dnl same symbol.
AC_CACHE_CHECK([if -Wno-ignored-attributes is required for aliases],
libc_cv_wno_ignored_attributes, [dnl
cat > conftest.c <<EOF
void __foo (void)
{
}
extern __typeof (__foo) foo __attribute__ ((weak, alias ("__foo")));
extern __typeof (__foo) bar __attribute__ ((weak, alias ("foo")));
EOF
libc_cv_wno_ignored_attributes=""
if ! AC_TRY_COMMAND([${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

10
math/Makefile
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@ -1535,6 +1535,16 @@ CFLAGS-s_y0f.c += -fno-builtin-y0f32
CFLAGS-s_y1f.c += -fno-builtin-y1f32
CFLAGS-s_ynf.c += -fno-builtin-ynf32
CFLAGS-s_fabsf128.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-s_sincos.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-w_exp10_compat.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-fraiseexcpt.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-fegetround.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-fesetround.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-fegetenv.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-fesetenv.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-feholdexcpt.c += $(config-cflags-wno-ignored-attributes)
# These files quiet sNaNs in a way that is optimized away without
# -fsignaling-nans.
CFLAGS-s_modf.c += $(config-cflags-signaling-nans)

1
string/Makefile
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@ -280,6 +280,7 @@ CFLAGS-memchr.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-mempcpy.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-stpcpy.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-strnlen.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-ffsll.c += $(config-cflags-wno-ignored-attributes)
ifeq ($(run-built-tests),yes)
$(objpfx)tst-svc-cmp.out: tst-svc.expect $(objpfx)tst-svc.out