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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/azanella/clang] Use -frounding-math iff compiler supports it Date: Thu, 12 May 2022 19:34:32 +0000 (GMT) [thread overview] Message-ID: <20220512193432.369ED3886C74@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=384b36a48d5ae2816ebfd011866a01d54a93e7b8 commit 384b36a48d5ae2816ebfd011866a01d54a93e7b8 Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Tue Mar 15 16:01:29 2022 -0300 Use -frounding-math iff compiler supports it Diff: --- Makeconfig | 2 +- configure | 22 ++++++++++++++++++++++ configure.ac | 9 +++++++++ 3 files changed, 32 insertions(+), 1 deletion(-) diff --git a/Makeconfig b/Makeconfig index b5aa07c4f4..ee39dc5711 100644 --- a/Makeconfig +++ b/Makeconfig @@ -846,7 +846,7 @@ endif # We have to assume that glibc functions are called in any rounding # mode and also change the rounding mode in a few functions. So, # disable any optimization that assume default rounding mode. -+math-flags = -frounding-math ++math-flags = $(config-cflags-frounding-math) # Logically only "libnldbl", "nonlib" and "testsuite" should be using # -fno-math-errno. However due to GCC bug #88576, only "libm" can use diff --git a/configure b/configure index 4738e16b9b..ef97002749 100755 --- a/configure +++ b/configure @@ -6491,6 +6491,28 @@ $as_echo "$libc_cv_cc_signaling_nans" >&6; } config_vars="$config_vars config-cflags-signaling-nans = $libc_cv_cc_signaling_nans" +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for compiler option -frounding-math" >&5 +$as_echo_n "checking for compiler option -frounding-math... " >&6; } +if ${libc_cv_cc_rounding_math+:} false; then : + $as_echo_n "(cached) " >&6 +else + if { ac_try='${CC-cc} -Werror -frounding-math -xc /dev/null -S -o /dev/null' + { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 + (eval $ac_try) 2>&5 + ac_status=$? + $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 + test $ac_status = 0; }; }; then : + libc_cv_cc_rounding_math=-frounding-math +else + libc_cv_cc_rounding_math= +fi + +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_rounding_math" >&5 +$as_echo "$libc_cv_cc_rounding_math" >&6; } +config_vars="$config_vars +config-cflags-frounding-math = $libc_cv_cc_rounding_math" + { $as_echo "$as_me:${as_lineno-$LINENO}: checking if $CC accepts -fno-tree-loop-distribute-patterns with \ __attribute__ ((__optimize__))" >&5 $as_echo_n "checking if $CC accepts -fno-tree-loop-distribute-patterns with \ diff --git a/configure.ac b/configure.ac index cf50761b3d..7a8412f86b 100644 --- a/configure.ac +++ b/configure.ac @@ -1535,6 +1535,15 @@ LIBC_TRY_CC_OPTION([-Werror -fsignaling-nans], LIBC_CONFIG_VAR([config-cflags-signaling-nans], [$libc_cv_cc_signaling_nans]) +dnl Determina if compiler support -frounding-math +AC_CACHE_CHECK([for compiler option -frounding-math], libc_cv_cc_rounding_math, [dnl +LIBC_TRY_CC_OPTION([-Werror -frounding-math], + [libc_cv_cc_rounding_math=-frounding-math], + [libc_cv_cc_rounding_math=]) +]) +LIBC_CONFIG_VAR([config-cflags-frounding-math], + [$libc_cv_cc_rounding_math]) + 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
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