From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id 4E29B3857C52; Tue, 4 Oct 2022 12:59:31 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4E29B3857C52 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1664888371; bh=FDLyShXtB2s7zZxnUr5O+JT6uhH0Tfl4etlAHrdWoYk=; h=From:To:Subject:Date:From; b=GJW/QwJSMAhq2OyRqFYvxQJln6bJ5kGvwfNNyOjprhj4RAIcOX228uQUhcnC1Ohnc 6WXZHBQaRAWpLnC8uyIxOb9ScODtrnuzbvHw0ljnmwu0RgeARZTn7igGEIaL1zy2qM Po6olFZNsGcw1gm2eE9X0AX01ekxtvQWzx/t7wsc= 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: 44883f257b6ac4c5899fd3288d474a1dcf46027c X-Git-Newrev: 91bda0ee2596703ff94600339b632c54246e41e5 Message-Id: <20221004125931.4E29B3857C52@sourceware.org> Date: Tue, 4 Oct 2022 12:59:31 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=91bda0ee2596703ff94600339b632c54246e41e5 commit 91bda0ee2596703ff94600339b632c54246e41e5 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 842f49eb58..adb83e6801 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 5fc7d6f0d4..f777e4fafd 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 $CC accepts -fno-tree-loop-distribute-patterns with \ diff --git a/configure.ac b/configure.ac index fb698c3d7d..03e14b13a0 100644 --- a/configure.ac +++ b/configure.ac @@ -1557,6 +1557,15 @@ LIBC_TRY_CC_OPTION([-Werror -fsignaling-nans], LIBC_CONFIG_VAR([config-cflags-signaling-nans], [$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 <