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configure: Only use -fno-fp-int-builtin-inexact if compiler supports it 

Checked on x86_64-linux-gnu.

Reviewed-by: Sam James <sam@gentoo.org>
This commit is contained in:
Adhemerval Zanella 2025-11-20 15:30:10 -03:00
parent 2885d8a3ab
commit 25de0771ec
3 changed files with 87 additions and 16 deletions
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60
configure vendored
View File

@ -9210,6 +9210,66 @@ have-cc-gcs = $libc_cv_cc_gcs"
config_vars="$config_vars
have-test-cc-gcs = $libc_cv_test_cc_gcs"
# Check if compiler supports -fno-fp-int-builtin-inexact
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if compiler supports -fno-fp-int-builtin-inexact" >&5
printf %s "checking if compiler supports -fno-fp-int-builtin-inexact... " >&6; }
if test ${libc_cv_cc_no_fp_builtin_inexact+y}
then :
printf %s "(cached) " >&6
else case e in #(
e) if { ac_try='${CC-cc} -Werror -fno-fp-int-builtin-inexact -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 $ac_status = 0; }; }
then :
libc_cv_cc_no_fp_builtin_inexact=-fno-fp-int-builtin-inexact
else case e in #(
e) libc_cv_cc_no_fp_builtin_inexact= ;;
esac
fi ;;
esac
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_no_fp_builtin_inexact" >&5
printf "%s\n" "$libc_cv_cc_no_fp_builtin_inexact" >&6; }
if test "$TEST_CC" = "$CC"; then
libc_cv_test_cc_no_fp_builtin_inexact=$libc_cv_cc_no_fp_builtin_inexact
else
saved_CC="$CC"
CC="$TEST_CC"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if compiler supports -fno-fp-int-builtin-inexact in testing" >&5
printf %s "checking if compiler supports -fno-fp-int-builtin-inexact in testing... " >&6; }
if test ${libc_cv_test_cc_no_fp_builtin_inexact+y}
then :
printf %s "(cached) " >&6
else case e in #(
e) if { ac_try='${CC-cc} -Werror -fno-fp-int-builtin-inexact -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 $ac_status = 0; }; }
then :
libc_cv_test_cc_no_fp_builtin_inexact=-fno-fp-int-builtin-inexact
else case e in #(
e) libc_cv_test_cc_no_fp_builtin_inexact= ;;
esac
fi ;;
esac
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_test_cc_no_fp_builtin_inexact" >&5
printf "%s\n" "$libc_cv_test_cc_no_fp_builtin_inexact" >&6; }
CC="$saved_CC"
fi
config_vars="$config_vars
config-cflags-no-fp-builtin-inexact = $libc_cv_cc_no_fp_builtin_inexact"
# Check if linker supports GCS marking
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for linker that supports -z gcs=always" >&5
printf %s "checking for linker that supports -z gcs=always... " >&6; }

11
configure.ac
View File

@ -2061,6 +2061,17 @@ LIBC_TRY_CC_AND_TEST_CC_OPTION([if compiler supports -mbranch-protection=gcs],
LIBC_CONFIG_VAR([have-cc-gcs], [$libc_cv_cc_gcs])
LIBC_CONFIG_VAR([have-test-cc-gcs], [$libc_cv_test_cc_gcs])
# Check if compiler supports -fno-fp-int-builtin-inexact
LIBC_TRY_CC_AND_TEST_CC_OPTION([if compiler supports -fno-fp-int-builtin-inexact],
[-Werror -fno-fp-int-builtin-inexact],
libc_cv_cc_no_fp_builtin_inexact,
[libc_cv_cc_no_fp_builtin_inexact=-fno-fp-int-builtin-inexact],
[libc_cv_cc_no_fp_builtin_inexact=],
libc_cv_test_cc_no_fp_builtin_inexact,
[libc_cv_test_cc_no_fp_builtin_inexact=-fno-fp-int-builtin-inexact],
[libc_cv_test_cc_no_fp_builtin_inexact=])
LIBC_CONFIG_VAR([config-cflags-no-fp-builtin-inexact], [$libc_cv_cc_no_fp_builtin_inexact])
# Check if linker supports GCS marking
LIBC_LINKER_FEATURE([-z gcs=always], [-Wl,-z,gcs=always],
[libc_cv_ld_gcs=yes], [libc_cv_ld_gcs=no])

32
math/Makefile
View File

@ -1827,22 +1827,22 @@ CFLAGS-s_modff128.c += $(config-cflags-signaling-nans)
# These files rely on C23 semantics for avoiding "inexact" exceptions
# from rounding functions. These settings can be removed when glibc
# builds with -std=gnu23 or later.
CFLAGS-s_fromfp.c += -fno-fp-int-builtin-inexact
CFLAGS-s_fromfpx.c += -fno-fp-int-builtin-inexact
CFLAGS-s_ufromfp.c += -fno-fp-int-builtin-inexact
CFLAGS-s_ufromfpx.c += -fno-fp-int-builtin-inexact
CFLAGS-s_fromfpf.c += -fno-fp-int-builtin-inexact
CFLAGS-s_fromfpxf.c += -fno-fp-int-builtin-inexact
CFLAGS-s_ufromfpf.c += -fno-fp-int-builtin-inexact
CFLAGS-s_ufromfpxf.c += -fno-fp-int-builtin-inexact
CFLAGS-s_fromfpl.c += -fno-fp-int-builtin-inexact
CFLAGS-s_fromfpxl.c += -fno-fp-int-builtin-inexact
CFLAGS-s_ufromfpl.c += -fno-fp-int-builtin-inexact
CFLAGS-s_ufromfpxl.c += -fno-fp-int-builtin-inexact
CFLAGS-s_fromfpf128.c += -fno-fp-int-builtin-inexact
CFLAGS-s_fromfpxf128.c += -fno-fp-int-builtin-inexact
CFLAGS-s_ufromfpf128.c += -fno-fp-int-builtin-inexact
CFLAGS-s_ufromfpxf128.c += -fno-fp-int-builtin-inexact
CFLAGS-s_fromfp.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_fromfpx.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_ufromfp.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_ufromfpx.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_fromfpf.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_fromfpxf.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_ufromfpf.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_ufromfpxf.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_fromfpl.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_fromfpxl.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_ufromfpl.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_ufromfpxl.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_fromfpf128.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_fromfpxf128.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_ufromfpf128.c += $(config-cflags-no-fp-builtin-inexact)
CFLAGS-s_ufromfpxf128.c += $(config-cflags-no-fp-builtin-inexact)
$(addprefix $(objpfx),\
$(filter-out $(tests-static) $(libm-tests-vector),\