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Add test-config-cflags-float-store for -ffloat-store

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Clang doesn't support -ffloat-store:

clang: error: optimization flag '-ffloat-store' is not supported [-Werror,-Wignored-optimization-argument]

Define test-config-cflags-float-store for -ffloat-store and use it in
math/Makefile for testing.

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 2024-12-15 21:24:14 +08:00
parent 90edd56c01
commit 56cdc529fb
3 changed files with 46 additions and 2 deletions
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33
configure vendored
View File

@ -7680,6 +7680,39 @@ config_vars="$config_vars
config-cflags-signaling-nans = $libc_cv_cc_signaling_nans"
saved_CC="$CC"
CC="$TEST_CC"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -ffloat-store in testing" >&5
printf %s "checking for -ffloat-store in testing... " >&6; }
if test ${libc_cv_test_cc_float_store+y}
then :
printf %s "(cached) " >&6
else case e in #(
e) if { ac_try='${CC-cc} -Werror -ffloat-store -xc /dev/null -S -o /dev/null'
{ { 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 $ac_status = 0; }; }
then :
libc_cv_test_cc_float_store="-ffloat-store"
else case e in #(
e) libc_cv_test_cc_float_store= ;;
esac
fi ;;
esac
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_test_cc_float_store" >&5
printf "%s\n" "$libc_cv_test_cc_float_store" >&6; }
CC="$saved_CC"
config_vars="$config_vars
test-config-cflags-float-store = $libc_cv_test_cc_float_store"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if $CC accepts -fno-tree-loop-distribute-patterns with \
__attribute__ ((__optimize__))" >&5
printf %s "checking if $CC accepts -fno-tree-loop-distribute-patterns with \

9
configure.ac
View File

@ -1497,6 +1497,15 @@ LIBC_CONFIG_VAR([config-cflags-signaling-nans],
[$libc_cv_cc_signaling_nans])
AC_SUBST(libc_cv_test_cc_signaling_nans)
dnl Determine if TEST_CC supports -ffloat-store.
LIBC_TRY_TEST_CC_OPTION([for -ffloat-store],
[-Werror -ffloat-store],
libc_cv_test_cc_float_store,
[libc_cv_test_cc_float_store="-ffloat-store"],
[libc_cv_test_cc_float_store=])
LIBC_CONFIG_VAR([test-config-cflags-float-store],
[$libc_cv_test_cc_float_store])
AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
__attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
cat > conftest.c <<EOF

6
math/Makefile
View File

@ -1062,7 +1062,8 @@ endif
libm-test-fast-math-cflags = -fno-builtin -D__FAST_MATH__ -DTEST_FAST_MATH
libm-test-vec-cflags = $(libm-test-fast-math-cflags) -fno-inline \
-ffloat-store -D_OPENMP=201307 -Wno-unknown-pragmas
$(test-config-cflags-float-store) \
-D_OPENMP=201307 -Wno-unknown-pragmas
CFLAGS-test-double-vlen4-wrappers.c += $(double-vlen4-arch-ext-cflags)
@ -1078,7 +1079,8 @@ CFLAGS-test-float-vlen16-wrappers.c += $(float-vlen16-arch-ext-cflags)
# raise spurious exceptions for sNaNs, but also do not test for
# exceptions. Thus both versions of the classification macros are
# validated.
libm-test-no-inline-cflags = -fno-inline -ffloat-store -fno-builtin \
libm-test-no-inline-cflags = -fno-inline -fno-builtin \
$(test-config-cflags-float-store) \
$(config-cflags-signaling-nans)
CFLAGS-test-tgmath.c += -fno-builtin
# The following testcase uses very long lines (>3 million), so it may take a