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math: Use -fexcess-precision=standard iff compiler supports it

This commit is contained in:
Adhemerval Zanella 2022-03-10 17:22:41 -03:00
parent abb5617df1
commit ebfca2ad16
5 changed files with 41 additions and 7 deletions
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26
configure vendored
View File

@ -7582,6 +7582,32 @@ 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 for -fexcess-precision=standard" >&5
printf %s "checking for -fexcess-precision=standard... " >&6; }
if test ${libc_cv_fexcess_precision_standard+y}
then :
printf %s "(cached) " >&6
else case e in #(
e) if { ac_try='${CC-cc} -Werror -fexcess-precision=standard -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 $ac_status = 0; }; }
then :
libc_cv_fexcess_precision_standard=-fexcess-precision=standard
else case e in #(
e) libc_cv_fexcess_precision_standard= ;;
esac
fi
;;
esac
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_fexcess_precision_standard" >&5
printf "%s\n" "$libc_cv_fexcess_precision_standard" >&6; }
config_vars="$config_vars
config-cflags-fexcess-precision-standard = $libc_cv_fexcess_precision_standard"
{ printf "%s\n" "$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}

8
configure.ac
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@ -1433,6 +1433,14 @@ AC_CACHE_CHECK([for -Wno-maybe-uninitialized],
LIBC_CONFIG_VAR([config-cflags-wno-maybe-uninitialized],
[$libc_cv_wno_maybe_uninitialized])
AC_CACHE_CHECK([for -fexcess-precision=standard], libc_cv_fexcess_precision_standard, [dnl
LIBC_TRY_CC_OPTION([-Werror -fexcess-precision=standard],
[libc_cv_fexcess_precision_standard=-fexcess-precision=standard],
[libc_cv_fexcess_precision_standard=])
])
LIBC_CONFIG_VAR([config-cflags-fexcess-precision-standard],
[$libc_cv_fexcess_precision_standard])
AC_CACHE_CHECK(whether cc puts quotes around section names,
libc_cv_have_section_quotes,
[cat > conftest.c <<EOF

6
math/Makefile
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@ -1126,9 +1126,9 @@ CFLAGS-test-math-iszero.cc += -std=gnu++11
CFLAGS-test-math-issignaling.cc += -std=gnu++11
CFLAGS-test-math-iscanonical.cc += -std=gnu++11
CFLAGS-test-iszero-excess-precision.c += -fexcess-precision=standard
CFLAGS-test-iseqsig-excess-precision.c += -fexcess-precision=standard
CFLAGS-test-flt-eval-method.c += -fexcess-precision=standard
CFLAGS-test-iszero-excess-precision.c += $(config-cflags-fexcess-precision-standard)
CFLAGS-test-iseqsig-excess-precision.c += $(config-cflags-fexcess-precision-standard)
CFLAGS-test-flt-eval-method.c += $(config-cflags-fexcess-precision-standard)
CFLAGS-test-fe-snans-always-signal.c += $(config-cflags-signaling-nans)

4
support/Makefile
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@ -258,8 +258,8 @@ CFLAGS-.oS += -fexceptions -fasynchronous-unwind-tables
# being within the observed range. The code uses double internally
# in support_timespec_check_in_range and for that computation we use
# -fexcess-precision=standard.
CFLAGS-timespec.c += -fexcess-precision=standard
CFLAGS-timespec-time64.c += -fexcess-precision=standard
CFLAGS-timespec.c += $(config-cflags-fexcess-precision-standard)
CFLAGS-timespec-time64.c += $(config-cflags-fexcess-precision-standard)
# Ensure that general support files use 64-bit time_t
CFLAGS-delayed_exit.c += -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64

4
sysdeps/x86/fpu/Makefile
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@ -16,7 +16,7 @@ endif
CFLAGS-test-fenv-sse.c += -msse2 -mfpmath=sse
CFLAGS-test-fenv-clear-sse.c += -msse2 -mfpmath=sse
CFLAGS-test-fenv-sse-2.c += -msse2 -mfpmath=sse
CFLAGS-test-flt-eval-method-387.c += -fexcess-precision=standard -mfpmath=387
CFLAGS-test-flt-eval-method-sse.c += -fexcess-precision=standard -msse2 \
CFLAGS-test-flt-eval-method-387.c += $(config-cflags-fexcess-precision-standard) -mfpmath=387
CFLAGS-test-flt-eval-method-sse.c += $(config-cflags-fexcess-precision-standard) -msse2 \
-mfpmath=sse
endif