diff options
Diffstat (limited to 'gcc/configure.ac')
| -rw-r--r-- | gcc/configure.ac | 52 |
1 files changed, 21 insertions, 31 deletions
diff --git a/gcc/configure.ac b/gcc/configure.ac index 2c43b38..2532523 100644 --- a/gcc/configure.ac +++ b/gcc/configure.ac @@ -563,35 +563,6 @@ if test $ac_cv_std_swap_in_utility = yes; then [Define if <utility> defines std::swap.]) fi -# Check whether compiler is affected by placement new aliasing bug (PR 29286). -# If the host compiler is affected by the bug, and we build with optimization -# enabled (which happens e.g. when cross-compiling), the pool allocator may -# get miscompiled. Use -fno-strict-aliasing to work around this problem. -# Since there is no reliable feature check for the presence of this bug, -# we simply use a GCC version number check. (This should never trigger for -# stages 2 or 3 of a native bootstrap.) -aliasing_flags= -if test "$GCC" = yes; then - saved_CXXFLAGS="$CXXFLAGS" - - # The following test compilation will succeed if and only if $CXX accepts - # -fno-strict-aliasing *and* is older than GCC 4.3. - CXXFLAGS="$CXXFLAGS -fno-strict-aliasing" - AC_MSG_CHECKING([whether $CXX is affected by placement new aliasing bug]) - AC_COMPILE_IFELSE([AC_LANG_SOURCE([ -#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) -#error compiler not affected by placement new aliasing bug -#endif -])], - [AC_MSG_RESULT([yes]); aliasing_flags='-fno-strict-aliasing'], - [AC_MSG_RESULT([no])]) - - CXXFLAGS="$saved_CXXFLAGS" -fi -AC_SUBST(aliasing_flags) - - - # --------------------- # Warnings and checking # --------------------- @@ -3336,8 +3307,8 @@ case $target in esac # Check if we have .[us]leb128, and support symbol arithmetic with it. -# Older versions of GAS and some non-GNU assemblers, have a bugs handling -# these directives, even when they appear to accept them. +# Older versions of GAS and some non-GNU assemblers have bugs in handling +# of these directives, even when they appear to accept them. gcc_GAS_CHECK_FEATURE([.sleb128 and .uleb128], gcc_cv_as_leb128, [$check_leb128_asflags], [ .data @@ -3359,6 +3330,11 @@ elif test "x$gcc_cv_otool" != x; then | grep '04 80 0a 8e 78 80 80 80 80 80 80 80 80 80 01' >/dev/null; then gcc_cv_as_leb128=yes fi +elif test "x$gcc_cv_readelf" != x; then + if $gcc_cv_readelf -x .data conftest.o 2>/dev/null \ + | grep '04800a8e 78808080 80808080 808001' >/dev/null; then + gcc_cv_as_leb128=yes + fi else # play safe, assume the assembler is broken. : @@ -6421,6 +6397,7 @@ if test x"$ld64_flag" = x"yes"; then gcc_cv_ld64_platform_version=0 gcc_cv_ld64_macos_version_min=0 gcc_cv_ld64_demangle=0 + gcc_cv_ld64_no_deduplicate=0 if test "$build" = "$host"; then darwin_try_test=1 @@ -6448,6 +6425,9 @@ if test x"$ld64_flag" = x"yes"; then if test "$gcc_cv_ld64_major" -ge 236; then gcc_cv_ld64_export_dynamic=1 fi + if test "$gcc_cv_ld64_major" -ge 262; then + gcc_cv_ld64_no_deduplicate=1 + fi if test "$gcc_cv_ld64_major" -ge 512; then gcc_cv_ld64_platform_version=1 gcc_cv_ld64_macos_version_min=1 @@ -6476,6 +6456,13 @@ if test x"$ld64_flag" = x"yes"; then fi AC_MSG_RESULT($gcc_cv_ld64_export_dynamic) + AC_MSG_CHECKING(linker for -no_deduplicate support) + gcc_cv_ld64_no_deduplicate=1 + if $gcc_cv_ld -no_deduplicate < /dev/null 2>&1 | grep 'unknown option' > /dev/null; then + gcc_cv_ld64_no_deduplicate=0 + fi + AC_MSG_RESULT($gcc_cv_ld64_no_deduplicate) + AC_MSG_CHECKING(linker for -platform_version support) gcc_cv_ld64_platform_version=1 if $gcc_cv_ld -platform_version macos 10.5 0.0 < /dev/null 2>&1 | grep 'unknown option' > /dev/null; then @@ -6502,6 +6489,9 @@ if test x"$ld64_flag" = x"yes"; then AC_DEFINE_UNQUOTED(LD64_HAS_EXPORT_DYNAMIC, $gcc_cv_ld64_export_dynamic, [Define to 1 if ld64 supports '-export_dynamic'.]) + AC_DEFINE_UNQUOTED(LD64_HAS_NO_DEDUPLICATE, $gcc_cv_ld64_no_deduplicate, + [Define to 1 if ld64 supports '-no_deduplicate'.]) + AC_DEFINE_UNQUOTED(LD64_HAS_PLATFORM_VERSION, $gcc_cv_ld64_platform_version, [Define to 1 if ld64 supports '-platform_version'.]) |