From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id 4027F3947425; Wed, 16 Mar 2022 18:04:48 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4027F3947425 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: a0bdfed04cb897804a9e7a516ac34e2343bb10ad X-Git-Newrev: bba43a7040c4f1604281c9d9fd56e860c296a57b Message-Id: <20220316180448.4027F3947425@sourceware.org> Date: Wed, 16 Mar 2022 18:04:48 +0000 (GMT) X-BeenThere: glibc-cvs@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Glibc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Mar 2022 18:04:48 -0000 https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bba43a7040c4f1604281c9d9fd56e860c296a57b commit bba43a7040c4f1604281c9d9fd56e860c296a57b 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 47db08d6ae..c0cf1e2890 100644 --- a/Makeconfig +++ b/Makeconfig @@ -861,7 +861,7 @@ 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 d891044cef..dd764161e1 100755 --- a/configure +++ b/configure @@ -6646,6 +6646,28 @@ fi $as_echo "$libc_cv_cc_signaling_nans" >&6; } +{ $as_echo "$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 $CC accepts -fno-tree-loop-distribute-patterns with \ diff --git a/configure.ac b/configure.ac index 64fbbce11f..ee92ee42b4 100644 --- a/configure.ac +++ b/configure.ac @@ -1666,6 +1666,15 @@ LIBC_TRY_CC_OPTION([-Werror -fsignaling-nans], ]) AC_SUBST(libc_cv_cc_signaling_nans) +dnl Determina if compiler support -frounding-math +AC_CACHE_CHECK([for compiler option -frounding-math], libc_cv_cc_rounding_math, [dnl +LIBC_TRY_CC_OPTION([-Werror -frounding-math], + [libc_cv_cc_rounding_math=-frounding-math], + [libc_cv_cc_rounding_math=]) +]) +LIBC_CONFIG_VAR([config-cflags-frounding-math], + [$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 <