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(localhost [IPv6:::1]) by gnu-tgl-3.localdomain (Postfix) with ESMTP id 2A140C0232; Thu, 19 Dec 2024 03:21:22 +0800 (CST) From: "H.J. Lu" To: libc-alpha@sourceware.org Cc: sam@gentoo.org, josmyers@redhat.com Subject: [PATCH] Add test-config-cflags-float-store for -ffloat-store Date: Thu, 19 Dec 2024 03:21:22 +0800 Message-ID: <20241218192122.3709015-1-hjl.tools@gmail.com> X-Mailer: git-send-email 2.47.1 MIME-Version: 1.0 X-Spam-Status: No, score=-3017.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~patchwork=sourceware.org@sourceware.org Clang doesn't support -ffloat-store: clang: error: optimization flag '-ffloat-store' is not supported [-Werror,-Wignored-optimization-argument] Define test-config-cflags-float-store for -ffloat-store and use it in math/Makefile for testing. Signed-off-by: H.J. Lu --- aclocal.m4 | 11 +++++++++++ configure | 33 +++++++++++++++++++++++++++++++++ configure.ac | 9 +++++++++ math/Makefile | 6 ++++-- 4 files changed, 57 insertions(+), 2 deletions(-) diff --git a/aclocal.m4 b/aclocal.m4 index fb4c1ef1c4..915bcf4601 100644 --- a/aclocal.m4 +++ b/aclocal.m4 @@ -447,3 +447,14 @@ LIBC_CHECK_TEST_CXX( fi]) ) rm -f conftest*]) + +dnl Test a TEST_CC compiler option or options with an empty input file. +dnl LIBC_TRY_TEST_CC_OPTION([message], [options], +dnl [TEST_CC-cache-id], [TEST_CC-action-if-true], [TEST_CC-action-if-false]) +AC_DEFUN([LIBC_TRY_TEST_CC_OPTION], +[ +LIBC_CHECK_TEST_CC( + AC_CACHE_CHECK([$1 in testing], $3, + [LIBC_TRY_CC_OPTION([$2], [$4], [$5])]) + ) +]) diff --git a/configure b/configure index c231507721..30e95f0838 100755 --- a/configure +++ b/configure @@ -7681,6 +7681,39 @@ config_vars="$config_vars config-cflags-signaling-nans = $libc_cv_cc_signaling_nans" + + +saved_CC="$CC" +CC="$TEST_CC" +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -ffloat-store in testing" >&5 +printf %s "checking for -ffloat-store in testing... " >&6; } +if test ${libc_cv_test_cc_float_store+y} +then : + printf %s "(cached) " >&6 +else case e in #( + e) if { ac_try='${CC-cc} -Werror -ffloat-store -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 $ac_status = 0; }; } +then : + libc_cv_test_cc_float_store="-ffloat-store" +else case e in #( + e) libc_cv_test_cc_float_store= ;; +esac +fi ;; +esac +fi +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_test_cc_float_store" >&5 +printf "%s\n" "$libc_cv_test_cc_float_store" >&6; } + +CC="$saved_CC" + + +config_vars="$config_vars +test-config-cflags-float-store = $libc_cv_test_cc_float_store" + { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if $CC accepts -fno-tree-loop-distribute-patterns with \ __attribute__ ((__optimize__))" >&5 printf %s "checking if $CC accepts -fno-tree-loop-distribute-patterns with \ diff --git a/configure.ac b/configure.ac index cc1c76f5c8..e1d7c28eba 100644 --- a/configure.ac +++ b/configure.ac @@ -1498,6 +1498,15 @@ LIBC_CONFIG_VAR([config-cflags-signaling-nans], [$libc_cv_cc_signaling_nans]) AC_SUBST(libc_cv_test_cc_signaling_nans) +dnl Determine if TEST_CC supports -ffloat-store. +LIBC_TRY_TEST_CC_OPTION([for -ffloat-store], + [-Werror -ffloat-store], + libc_cv_test_cc_float_store, + [libc_cv_test_cc_float_store="-ffloat-store"], + [libc_cv_test_cc_float_store=]) +LIBC_CONFIG_VAR([test-config-cflags-float-store], + [$libc_cv_test_cc_float_store]) + AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \ __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl cat > conftest.c <3 million), so it may take a