From dfa0e92fa034019252305d62e42387bf6a758500 Mon Sep 17 00:00:00 2001
From: Joerg Sonnenberger <joerg@bec.de>
Date: Sat, 27 Apr 2013 22:12:32 +0000
Subject: [PATCH] Only use cxxabi.h's demangler, if it is actually available.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180684 91177308-0d34-0410-b5e6-96231b3b80d8
---
 autoconf/configure.ac              |  2 +-
 cmake/config-ix.cmake              |  1 +
 configure                          |  2 +-
 include/llvm/Config/config.h.cmake |  3 +++
 include/llvm/Config/config.h.in    |  3 +++
 lib/Support/Unix/Signals.inc       | 10 ++++++++--
 6 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 9c116f7c006..3101e9a5a16 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -1507,7 +1507,7 @@ AC_HEADER_STAT
 AC_HEADER_SYS_WAIT
 AC_HEADER_TIME
 
-AC_CHECK_HEADERS([dlfcn.h execinfo.h fcntl.h inttypes.h limits.h link.h])
+AC_CHECK_HEADERS([cxxabi.h dlfcn.h execinfo.h fcntl.h inttypes.h limits.h link.h])
 AC_CHECK_HEADERS([malloc.h setjmp.h signal.h stdint.h termios.h unistd.h])
 AC_CHECK_HEADERS([utime.h windows.h])
 AC_CHECK_HEADERS([sys/mman.h sys/param.h sys/resource.h sys/time.h sys/uio.h])
diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index 7c4285a299b..e5bcc0e9b11 100755
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -37,6 +37,7 @@ endfunction()
 check_include_file(argz.h HAVE_ARGZ_H)
 check_include_file(assert.h HAVE_ASSERT_H)
 check_include_file(ctype.h HAVE_CTYPE_H)
+check_include_file(cxxabi.h HAVE_CXXABI_H)
 check_include_file(dirent.h HAVE_DIRENT_H)
 check_include_file(dl.h HAVE_DL_H)
 check_include_file(dld.h HAVE_DLD_H)
diff --git a/configure b/configure
index 26b612d2799..4e146189e6f 100755
--- a/configure
+++ b/configure
@@ -14868,7 +14868,7 @@ fi
 
 
 
-for ac_header in dlfcn.h execinfo.h fcntl.h inttypes.h limits.h link.h
+for ac_header in cxxabi.h dlfcn.h execinfo.h fcntl.h inttypes.h limits.h link.h
 do
 as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
 if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
diff --git a/include/llvm/Config/config.h.cmake b/include/llvm/Config/config.h.cmake
index 97af6955d9e..93c2582ae23 100644
--- a/include/llvm/Config/config.h.cmake
+++ b/include/llvm/Config/config.h.cmake
@@ -69,6 +69,9 @@
 /* Define to 1 if you have the `closedir' function. */
 #cmakedefine HAVE_CLOSEDIR ${HAVE_CLOSEDIR}
 
+/* Define to 1 if you have the <cxxabi.h> header file. */
+#cmakedefine HAVE_CXXABI_H ${HAVE_CXXABI_H}
+
 /* Define to 1 if you have the <CrashReporterClient.h> header file. */
 #undef HAVE_CRASHREPORTERCLIENT_H
 
diff --git a/include/llvm/Config/config.h.in b/include/llvm/Config/config.h.in
index 7f75f4df69c..0cffd0febec 100644
--- a/include/llvm/Config/config.h.in
+++ b/include/llvm/Config/config.h.in
@@ -69,6 +69,9 @@
 /* Define to 1 if you have the `closedir' function. */
 #undef HAVE_CLOSEDIR
 
+/* Define to 1 if you have the <cxxabi.h> header file. */
+#undef HAVE_CXXABI_H
+
 /* Define to 1 if you have the <CrashReporterClient.h> header file. */
 #undef HAVE_CRASHREPORTERCLIENT_H
 
diff --git a/lib/Support/Unix/Signals.inc b/lib/Support/Unix/Signals.inc
index 66338f17d88..1f8c8158d7f 100644
--- a/lib/Support/Unix/Signals.inc
+++ b/lib/Support/Unix/Signals.inc
@@ -27,9 +27,11 @@
 #if HAVE_SYS_STAT_H
 #include <sys/stat.h>
 #endif
-#if HAVE_DLFCN_H && __GNUG__
+#if HAVE_CXXABI_H
+#include cxxabi.h>
+#endif
+#if HAVE_DLFCN_H
 #include <dlfcn.h>
-#include <cxxabi.h>
 #endif
 #if HAVE_MACH_MACH_H
 #include <mach/mach.h>
@@ -292,7 +294,11 @@ void llvm::sys::PrintStackTrace(FILE *FD) {
     if (dlinfo.dli_sname != NULL) {
       int res;
       fputc(' ', FD);
+#  if HAVE_CXXABI_H
       char* d = abi::__cxa_demangle(dlinfo.dli_sname, NULL, NULL, &res);
+#  else
+      char* d = NULL;
+#  endif
       if (d == NULL) fputs(dlinfo.dli_sname, FD);
       else           fputs(d, FD);
       free(d);