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elf: Check if __attribute__ ((aligned (65536))) is supported 

The BZ #32763 tests fail to build for MicroBlaze (which defines
MAX_OFILE_ALIGNMENT to (32768*8) in GCC, so __attribute__ ((aligned
(65536))) is unsupported).  Add a configure-time check to enable BZ #32763
tests only if __attribute__ ((aligned (65536))) is supported.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>
This commit is contained in:
H.J. Lu 2025-03-07 08:58:47 +08:00
parent 4e68a5ca5d
commit 9b91484bee
3 changed files with 48 additions and 5 deletions
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30
configure vendored
View File

@ -8678,6 +8678,35 @@ if test $libc_cv_builtin_trap = yes; then
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports __attribute__ ((aligned (65536)))" >&5
printf %s "checking whether the compiler supports __attribute__ ((aligned (65536)))... " >&6; }
if test ${libc_cv_aligned_65536+y}
then :
printf %s "(cached) " >&6
else case e in #(
e)
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
char bss0xb5dce8 __attribute__ ((aligned (65536)));
_ACEOF
if ac_fn_c_try_compile "$LINENO"
then :
libc_cv_aligned_65536=yes
else case e in #(
e) libc_cv_aligned_65536=no ;;
esac
fi
rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
;;
esac
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_aligned_65536" >&5
printf "%s\n" "$libc_cv_aligned_65536" >&6; }
config_vars="$config_vars
aligned-65536 = $libc_cv_aligned_65536"
ac_ext=cpp
ac_cpp='$CXXCPP $CPPFLAGS'
ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
@ -8945,7 +8974,6 @@ load-address-ldflag = $libc_cv_load_address_ldflag"
# Check if compilers support GCS in branch protection:
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if compiler supports -mbranch-protection=gcs" >&5
printf %s "checking if compiler supports -mbranch-protection=gcs... " >&6; }
if test ${libc_cv_cc_gcs+y}

11
configure.ac
View File

@ -1824,6 +1824,17 @@ if test $libc_cv_builtin_trap = yes; then
AC_DEFINE([HAVE_BUILTIN_TRAP])
fi
dnl Check if
AC_CACHE_CHECK([whether the compiler supports __attribute__ ((aligned (65536)))],
libc_cv_aligned_65536, [
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
char bss[0xb5dce8] __attribute__ ((aligned (65536)));
])],
[libc_cv_aligned_65536=yes],
[libc_cv_aligned_65536=no])
])
LIBC_CONFIG_VAR([aligned-65536], [$libc_cv_aligned_65536])
dnl C++ feature tests.
AC_LANG_PUSH([C++])

12
elf/Makefile
View File

@ -1137,17 +1137,19 @@ tests += \
tst-dlopen-pie \
tst-dlopen-self-pie \
tst-dlopen-tlsmodid-pie \
tst-pie-bss \
tst-pie1 \
tst-pie2 \
# tests
tests-pie += \
tst-dlopen-self-pie \
tst-dlopen-tlsmodid-pie \
tst-pie-bss \
tst-pie1 \
tst-pie2 \
# tests-pie
ifeq (yes,$(aligned-65536))
tests += tst-pie-bss
tests-pie += tst-pie-bss
endif
ifneq (,$(load-address-ldflag))
tests += \
tst-pie-address \
@ -1159,12 +1161,14 @@ LDFLAGS-tst-pie-address += $(load-address-ldflag)=$(pde-load-address)
ifeq (yes,$(enable-static-pie))
tests += \
tst-pie-address-static \
tst-pie-bss-static \
# tests
tests-static += \
tst-pie-address-static \
tst-pie-bss-static \
# tests-static
ifeq (yes,$(aligned-65536))
tests += tst-pie-bss-static
tests-static += tst-pie-bss-static
endif
LDFLAGS-tst-pie-address-static += \
$(load-address-ldflag)=$(pde-load-address)
endif