From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id 32083382DE2E; Fri, 28 Oct 2022 17:41:40 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 32083382DE2E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1666978900; bh=eAAjQxoCoGERs/IPALqDZyhCA2LwhGFAvXK0rsgfJ4U=; h=From:To:Subject:Date:From; b=O9icNRCTsyx2llqeVUiaVs3Ia74Qe7XMcYX1ovUes5xK3kUCqngi+1GzoKuHvV/gm 5AhsDZGNmyOw5K1FjuQZL3sLq2bEFhb93kAShYdmi7ymwdoJgay8J1xpxEekok/Vqf b8+VM3yHH4GppDWGqx0O6sXEb5+AhHfkqtmOpvrE= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Adhemerval Zanella To: glibc-cvs@sourceware.org Subject: [glibc/azanella/clang] Use -frounding-math iff compiler supports it X-Act-Checkin: glibc X-Git-Author: Adhemerval Zanella X-Git-Refname: refs/heads/azanella/clang X-Git-Oldrev: 147b34c631865ddc470058f295df52038ae628dd X-Git-Newrev: f2543b764a6555a272c9ae572b84a661843171e5 Message-Id: <20221028174140.32083382DE2E@sourceware.org> Date: Fri, 28 Oct 2022 17:41:40 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f2543b764a6555a272c9ae572b84a661843171e5 commit f2543b764a6555a272c9ae572b84a661843171e5 Author: Adhemerval Zanella 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 08a869cd11..d80db88190 100644 --- a/Makeconfig +++ b/Makeconfig @@ -874,7 +874,7 @@ 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 8e0894742c..ef1557ef6d 100755 --- a/configure +++ b/configure @@ -6520,6 +6520,28 @@ $as_echo "$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 $CC accepts -fno-tree-loop-distribute-patterns with \ diff --git a/configure.ac b/configure.ac index 67af290952..043b6973e0 100644 --- a/configure.ac +++ b/configure.ac @@ -1557,6 +1557,15 @@ LIBC_TRY_CC_OPTION([-Werror -fsignaling-nans], LIBC_CONFIG_VAR([config-cflags-signaling-nans], [$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 <