diff options
Diffstat (limited to 'autoconf')
| -rw-r--r-- | autoconf/configure.ac | 8 | ||||
| -rw-r--r-- | autoconf/m4/linux_mixed_64_32.m4 | 17 |
2 files changed, 25 insertions, 0 deletions
diff --git a/autoconf/configure.ac b/autoconf/configure.ac index e305869342..bdd665ccd6 100644 --- a/autoconf/configure.ac +++ b/autoconf/configure.ac @@ -284,6 +284,14 @@ if test "$llvm_cv_target_arch" = "Unknown" ; then AC_MSG_WARN([Configuring LLVM for an unknown target archicture]) fi +dnl Handle 32-bit linux systems running a 64-bit kernel. +if test "$llvm_cv_os_type" = "Linux" -a "$llvm_cv_target_arch" = "x86_64" ; then + AC_IS_LINUX_MIXED + if test "$llvm_cv_linux_mixed" = "yes"; then + llvm_cv_target_arch="x86" + fi +fi + # Determine the LLVM native architecture for the target case "$llvm_cv_target_arch" in x86) LLVM_NATIVE_ARCH="X86" ;; diff --git a/autoconf/m4/linux_mixed_64_32.m4 b/autoconf/m4/linux_mixed_64_32.m4 new file mode 100644 index 0000000000..123491f87e --- /dev/null +++ b/autoconf/m4/linux_mixed_64_32.m4 @@ -0,0 +1,17 @@ +# +# Some Linux machines run a 64-bit kernel with a 32-bit userspace. 'uname -m' +# shows these as x86_64. Ask the system 'gcc' what it thinks. +# +AC_DEFUN([AC_IS_LINUX_MIXED], +[AC_CACHE_CHECK(for 32-bit userspace on 64-bit system,llvm_cv_linux_mixed, +[ AC_LANG_PUSH([C]) + AC_COMPILE_IFELSE([AC_LANG_PROGRAM( + [[#ifndef __x86_64__ + error: Not x86-64 even if uname says so! + #endif + ]])], + [llvm_cv_linux_mixed=no], + [llvm_cv_linux_mixed=yes]) + AC_LANG_POP([C]) +]) +]) |