[gcc r10-10776] Darwin, X86, config: Adjust 'as' command lines [PR100340].

[gcc r10-10776] Darwin, X86, config: Adjust 'as' command lines [PR100340].

[Iain D Sandoe]

https://gcc.gnu.org/g:8e4e6100d7fdef22e3f3c8475699a32aeb3e60ea

commit r10-10776-g8e4e6100d7fdef22e3f3c8475699a32aeb3e60ea
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Sat Jul 31 16:29:03 2021 +0100

    Darwin, X86, config: Adjust 'as' command lines [PR100340].
    
    Versions of the assembler using clang from XCode 12.5/12.5.1
    have a bug which produces different code layout between debug and
    non-debug input, leading to a compare fail for default configure
    parameters.
    
    This is a workaround fix to disable the optimisation that is
    responsible for the bug.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
    
    PR target/100340 - Bootstrap fails with Clang 12.0.5 (XCode 12.5)
    
            PR target/100340
    
    gcc/ChangeLog:
    
            * config.in: Regenerate.
            * config/i386/darwin.h (EXTRA_ASM_OPTS): New
            (ASM_SPEC): Pass options to disable branch shortening where
            needed.
            * configure: Regenerate.
            * configure.ac: Detect versions of 'as' that support the
            optimisation which has the bug.
    
    (cherry picked from commit 743b8dd6fd757e997eb060d70fd4ae8e04fb56cd)

Diff:
---
 gcc/config.in            |  7 +++++++
 gcc/config/i386/darwin.h | 10 +++++++++-
 gcc/configure            | 35 +++++++++++++++++++++++++++++++++++
 gcc/configure.ac         |  9 +++++++++
 4 files changed, 60 insertions(+), 1 deletion(-)

diff --git a/gcc/config.in b/gcc/config.in
index 364eba47737..0938ca9013f 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -570,6 +570,13 @@
 #endif
 
 
+/* Define if your Mac OS X assembler supports -mllvm -x86-pad-for-align=false.
+   */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_MLLVM_X86_PAD_FOR_ALIGN
+#endif
+
+
 /* Define if your Mac OS X assembler supports the -mmacos-version-min option.
    */
 #ifndef USED_FOR_TARGET
diff --git a/gcc/config/i386/darwin.h b/gcc/config/i386/darwin.h
index 5faa1f40089..187697f1ab0 100644
--- a/gcc/config/i386/darwin.h
+++ b/gcc/config/i386/darwin.h
@@ -135,10 +135,18 @@ along with GCC; see the file COPYING3.  If not see
   %{mfentry*:%eDarwin does not support -mfentry or associated options}" \
   DARWIN_CC1_SPEC
 
+/* This is a workaround for a tool bug: see PR100340.  */
+
+#ifdef HAVE_AS_MLLVM_X86_PAD_FOR_ALIGN
+#define EXTRA_ASM_OPTS " -mllvm -x86-pad-for-align=false"
+#else
+#define EXTRA_ASM_OPTS ""
+#endif
+
 #undef ASM_SPEC
 #define ASM_SPEC "-arch %(darwin_arch) \
   " ASM_OPTIONS " -force_cpusubtype_ALL \
-  %{static}" ASM_MMACOSX_VERSION_MIN_SPEC
+  %{static}" ASM_MMACOSX_VERSION_MIN_SPEC EXTRA_ASM_OPTS
 
 #undef ENDFILE_SPEC
 #define ENDFILE_SPEC \
diff --git a/gcc/configure b/gcc/configure
index 84e0ea21054..10331ec5535 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -26421,6 +26421,41 @@ $as_echo "$as_me: WARNING: LTO for $target requires binutils >= 2.20.1, but vers
 	fi
 	;;
     esac
+    case $target_os in
+       darwin2[0-9]* | darwin19*)
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for llvm assembler x86-pad-for-align option" >&5
+$as_echo_n "checking assembler for llvm assembler x86-pad-for-align option... " >&6; }
+if ${gcc_cv_as_mllvm_x86_pad_for_align+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  gcc_cv_as_mllvm_x86_pad_for_align=no
+  if test x$gcc_cv_as != x; then
+    $as_echo '.text' > conftest.s
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -mllvm -x86-pad-for-align=false -o conftest.o conftest.s >&5'
+  { { eval echo "\"\$as_me\":${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
+	gcc_cv_as_mllvm_x86_pad_for_align=yes
+    else
+      echo "configure: failed program was" >&5
+      cat conftest.s >&5
+    fi
+    rm -f conftest.o conftest.s
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_mllvm_x86_pad_for_align" >&5
+$as_echo "$gcc_cv_as_mllvm_x86_pad_for_align" >&6; }
+if test $gcc_cv_as_mllvm_x86_pad_for_align = yes; then
+
+$as_echo "#define HAVE_AS_MLLVM_X86_PAD_FOR_ALIGN 1" >>confdefs.h
+
+fi
+
+       ;;
+    esac
 
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for -xbrace_comment" >&5
 $as_echo_n "checking assembler for -xbrace_comment... " >&6; }
diff --git a/gcc/configure.ac b/gcc/configure.ac
index d068618bd8f..a254528493f 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -4534,6 +4534,15 @@ foo:	nop
 	fi
 	;;
     esac
+    case $target_os in
+       darwin2[[0-9]]* | darwin19*)
+        gcc_GAS_CHECK_FEATURE([llvm assembler x86-pad-for-align option],
+          gcc_cv_as_mllvm_x86_pad_for_align,,
+          [-mllvm -x86-pad-for-align=false], [.text],,
+          [AC_DEFINE(HAVE_AS_MLLVM_X86_PAD_FOR_ALIGN, 1,
+	    [Define if your Mac OS X assembler supports -mllvm -x86-pad-for-align=false.])])
+       ;;
+    esac
 
     gcc_GAS_CHECK_FEATURE([-xbrace_comment], gcc_cv_as_ix86_xbrace_comment,,
       [-xbrace_comment=no], [.text],,