with a 64-bit kernel, which confuses LLVM. Make LLVM double-check this by
checking which defines the system gcc actually sets.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83047
91177308-0d34-0410-b5e6-
96231b3b80d8
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" ;;
--- /dev/null
+#
+# 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])
+])
+])