Include stddef.h before including cxxabi.h

On FreeBSD 10.0, size_t needs to be defined before including cxxabi.h.
Currenty HAVE_CXXABI_H is not defined on FreeBSD because of that reason.
This patch teaches cmake and configure how to include it.

http://reviews.llvm.org/D5940



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220665 91177308-0d34-0410-b5e6-96231b3b80d8

autoconf/configure.ac

@@ -1592,8 +1592,12 @@ AC_HEADER_SYS_WAIT
 AC_HEADER_TIME
 
 AC_LANG_PUSH([C++])
-AC_CHECK_HEADERS([cxxabi.h])
+dnl size_t must be defined before including cxxabi.h on FreeBSD 10.0.
+AC_CHECK_HEADERS([cxxabi.h], [], [],
+[#include <stddef.h>
+])
 AC_LANG_POP([C++])
+
 AC_CHECK_HEADERS([dlfcn.h execinfo.h fcntl.h inttypes.h link.h])
 AC_CHECK_HEADERS([malloc.h setjmp.h signal.h stdint.h termios.h unistd.h])
 AC_CHECK_HEADERS([utime.h])

cmake/config-ix.cmake

@@ -42,7 +42,6 @@ function(check_type_exists type files variable)
 endfunction()
 
 # include checks
-check_include_file_cxx(cxxabi.h HAVE_CXXABI_H)
 check_include_file(dirent.h HAVE_DIRENT_H)
 check_include_file(dlfcn.h HAVE_DLFCN_H)
 check_include_file(errno.h HAVE_ERRNO_H)
@@ -81,6 +80,12 @@ check_symbol_exists(FE_INEXACT "fenv.h" HAVE_DECL_FE_INEXACT)
 check_include_file(mach/mach.h HAVE_MACH_MACH_H)
 check_include_file(mach-o/dyld.h HAVE_MACH_O_DYLD_H)
 
+# size_t must be defined before including cxxabi.h on FreeBSD 10.0.
+check_cxx_source_compiles("
+#include <stddef.h>
+#include <cxxabi.h>
+" HAVE_CXXABI_H)
+
 # library checks
 if( NOT PURE_WINDOWS )
   check_library_exists(pthread pthread_create "" HAVE_LIBPTHREAD)