diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 0ae5003..78bcbe7 100644 --- a/configure.ac +++ b/configure.ac @@ -1483,6 +1483,8 @@ AC_TYPE_INT32_T AC_TYPE_INT64_T AC_CHECK_TYPE(ssize_t, AC_DEFINE(HAVE_SSIZE_T, 1, [Define if your compiler provides ssize_t]),,) +AC_CHECK_TYPE(__uint128_t, + AC_DEFINE(HAVE_GCC_UINT128_T, 1, [Define if your compiler provides __uint128_t]),,) # Sizes of various common basic types # ANSI C requires sizeof(char) == 1, so no need to check it @@ -3329,6 +3331,21 @@ else AC_MSG_ERROR([proper usage is --with-libc=STRING]) fi], [AC_MSG_RESULT(default LIBC="$LIBC")]) +# ************************************** +# * Check for gcc x64 inline assembler * +# ************************************** + +AC_MSG_CHECKING(for x64 gcc inline assembler) +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[ + __asm__ __volatile__ ("movq %rcx, %rax"); +]])],[have_gcc_asm_for_x64=yes],[have_gcc_asm_for_x64=no]) +AC_MSG_RESULT($have_gcc_asm_for_x64) +if test "$have_gcc_asm_for_x64" = yes +then + AC_DEFINE(HAVE_GCC_ASM_FOR_X64, 1, + [Define if we can use x64 gcc inline assembler]) +fi + # ************************************************** # * Check for various properties of floating point * # ************************************************** @@ -4333,6 +4350,89 @@ for dir in $SRCDIRS; do done AC_MSG_RESULT(done) +# Availability of -O2: +AC_MSG_CHECKING(for -O2) +saved_cflags="$CFLAGS" +CFLAGS="-O2" +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[ +]])],[have_O2=yes],[have_O2=no]) +AC_MSG_RESULT($have_O2) +CFLAGS="$saved_cflags" + +# _FORTIFY_SOURCE wrappers for memmove and bcopy are incorrect: +# http://sourceware.org/ml/libc-alpha/2010-12/msg00009.html +AC_MSG_CHECKING(for glibc _FORTIFY_SOURCE/memmove bug) +saved_cflags="$CFLAGS" +CFLAGS="-O2 -D_FORTIFY_SOURCE=2" +if test "$have_O2" = no; then + CFLAGS="" +fi +AC_RUN_IFELSE([AC_LANG_SOURCE([[ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +void foo(void *p, void *q) { memmove(p, q, 19); } +int main() { + char a[32] = "123456789000000000"; + foo(&a[9], a); + if (strcmp(a, "123456789123456789000000000") != 0) + return 1; + foo(a, &a[9]); + if (strcmp(a, "123456789000000000") != 0) + return 1; + return 0; +} +]])], +[have_glibc_memmove_bug=no], +[have_glibc_memmove_bug=yes], +[have_glibc_memmove_bug=undefined]) +CFLAGS="$saved_cflags" +AC_MSG_RESULT($have_glibc_memmove_bug) +if test "$have_glibc_memmove_bug" = yes; then + AC_DEFINE(HAVE_GLIBC_MEMMOVE_BUG, 1, + [Define if glibc has incorrect _FORTIFY_SOURCE wrappers + for memmove and bcopy.]) +fi + +if test "$have_gcc_asm_for_x87" = yes; then + # Some versions of gcc miscompile inline asm: + # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491 + # http://gcc.gnu.org/ml/gcc/2010-11/msg00366.html + case $CC in + *gcc*) + AC_MSG_CHECKING(for gcc ipa-pure-const bug) + saved_cflags="$CFLAGS" + CFLAGS="-O2" + AC_RUN_IFELSE([AC_LANG_SOURCE([[ + __attribute__((noinline)) int + foo(int *p) { + int r; + asm ( "movl \$6, (%1)\n\t" + "xorl %0, %0\n\t" + : "=r" (r) : "r" (p) : "memory" + ); + return r; + } + int main() { + int p = 8; + if ((foo(&p) ? : p) != 6) + return 1; + return 0; + } + ]])], + [have_ipa_pure_const_bug=no], + [have_ipa_pure_const_bug=yes], + [have_ipa_pure_const_bug=undefined]) + CFLAGS="$saved_cflags" + AC_MSG_RESULT($have_ipa_pure_const_bug) + if test "$have_ipa_pure_const_bug" = yes; then + AC_DEFINE(HAVE_IPA_PURE_CONST_BUG, 1, + [Define if gcc has the ipa-pure-const bug.]) + fi + ;; + esac +fi + # generate output files AC_CONFIG_FILES(Makefile.pre Modules/Setup.config Misc/python.pc) AC_CONFIG_FILES([Modules/ld_so_aix], [chmod +x Modules/ld_so_aix]) |