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configure: use TEST_CC to check for --no-error-execstack

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The ld.lld does not support the --no-error-execstack option, and it is
required only to suppress the linker warning while building tests. A new
configure macro, LIBC_TEST_LINKER_FEATURE, is added to check for linker
features using TEST_CC instead of CC.

Checked on x86_64-linux-gnu and aarch64-linux-gnu with gcc and
TEST_CC set to clang-18 and clan-21.

Reviewed-by: Sam James <sam@gentoo.org>
This commit is contained in:
Adhemerval Zanella
2025-12-09 11:58:32 -03:00
parent 522310e26b
commit a8455a0b7f
3 changed files with 41 additions and 6 deletions
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32
aclocal.m4 vendored
View File

@@ -268,6 +268,38 @@ else
fi
AC_MSG_RESULT($libc_linker_feature)])
dnl Check linker option support.
dnl LIBC_TEST_LINKER_FEATURE([ld_option], [cc_option], [action-if-true], [action-if-false])
AC_DEFUN([LIBC_TEST_LINKER_FEATURE],
[AC_MSG_CHECKING([for linker that supports $1])
libc_linker_feature=no
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
saved_CC="$CC"
CC="$TEST_CC"
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
$2 -nostdlib -nostartfiles
-fPIC -shared -o conftest.so conftest.c
1>&AS_MESSAGE_LOG_FD])
then
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp $2 -nostdlib \
-nostartfiles -fPIC -shared -o conftest.so conftest.c 2>&1 \
| grep "warning: $1 ignored" > /dev/null 2>&1; then
true
else
libc_linker_feature=yes
fi
fi
rm -f conftest*
if test $libc_linker_feature = yes; then
$3
else
$4
fi
CC="$saved_CC"
AC_MSG_RESULT($libc_linker_feature)])
dnl Add a makefile variable, with value set from a shell string
dnl (expanded by the shell inside double quotes), to config.make.
dnl LIBC_CONFIG_VAR(make-variable, shell-value)

9
configure vendored
View File

@@ -659,7 +659,7 @@ libc_cv_has_glob_dat
libc_cv_fpie
libc_cv_test_static_pie
libc_cv_z_execstack
libc_cv_no_error_execstack
libc_cv_test_no_error_execstack
ASFLAGS_config
libc_cv_cc_with_libunwind
libc_cv_insert
@@ -7142,6 +7142,8 @@ libc_linker_feature=no
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
saved_CC="$CC"
CC="$TEST_CC"
if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
-Wl,--no-error-execstack -nostdlib -nostartfiles
-fPIC -shared -o conftest.so conftest.c
@@ -7162,10 +7164,11 @@ then
fi
rm -f conftest*
if test $libc_linker_feature = yes; then
libc_cv_no_error_execstack=yes
libc_cv_test_no_error_execstack=yes
else
libc_cv_no_error_execstack=no
libc_cv_test_no_error_execstack=no
fi
CC="$saved_CC"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_linker_feature" >&5
printf "%s\n" "$libc_linker_feature" >&6; }

6
configure.ac
View File

@@ -1328,9 +1328,9 @@ if test $libc_cv_as_noexecstack = yes; then
fi
AC_SUBST(ASFLAGS_config)
LIBC_LINKER_FEATURE([--no-error-execstack], [-Wl,--no-error-execstack],
[libc_cv_no_error_execstack=yes], [libc_cv_no_error_execstack=no])
AC_SUBST(libc_cv_no_error_execstack)
LIBC_TEST_LINKER_FEATURE([--no-error-execstack], [-Wl,--no-error-execstack],
[libc_cv_test_no_error_execstack=yes], [libc_cv_test_no_error_execstack=no])
AC_SUBST(libc_cv_test_no_error_execstack)
LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
[libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])