From b873ba78fd0673160927fd3bf9cb6c44de6aeafa Mon Sep 17 00:00:00 2001
From: Paul Cornett <paulcor@bullseye.com>
Date: Wed, 2 Jan 2013 18:11:30 +0000
Subject: [PATCH 1/1] look for backtrace() in -lexecinfo, fixes #14942

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73333 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 configure    | 81 +++++++++++++++++++++++++++++++++++++++++++++-------
 configure.in | 23 ++++++++-------
 2 files changed, 83 insertions(+), 21 deletions(-)

diff --git a/configure b/configure
index 2504a67cc9..435cefc3c4 100755
--- a/configure
+++ b/configure
@@ -30433,49 +30433,108 @@ if ${wx_cv_func_backtrace+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
-            ac_ext=cpp
+            { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing backtrace" >&5
+$as_echo_n "checking for library containing backtrace... " >&6; }
+if ${ac_cv_search_backtrace+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char backtrace ();
+int
+main ()
+{
+return backtrace ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' execinfo; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_backtrace=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if ${ac_cv_search_backtrace+:} false; then :
+  break
+fi
+done
+if ${ac_cv_search_backtrace+:} false; then :
+
+else
+  ac_cv_search_backtrace=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_backtrace" >&5
+$as_echo "$ac_cv_search_backtrace" >&6; }
+ac_res=$ac_cv_search_backtrace
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+                    ac_ext=cpp
 ac_cpp='$CXXCPP $CPPFLAGS'
 ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
 ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
-            cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+                    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <execinfo.h>
 int
 main ()
 {
 
-                    void *trace[1];
-                    char **messages;
-
-                    backtrace(trace, 1);
-                    messages = backtrace_symbols(trace, 1);
+                            void *trace[1];
+                            char **messages;
+                            backtrace(trace, 1);
+                            messages = backtrace_symbols(trace, 1);
 
   ;
   return 0;
 }
 _ACEOF
-if ac_fn_cxx_try_compile "$LINENO"; then :
+if ac_fn_cxx_try_link "$LINENO"; then :
   wx_cv_func_backtrace=yes
 else
   wx_cv_func_backtrace=no
 
 fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-            ac_ext=c
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+                    ac_ext=c
 ac_cpp='$CPP $CPPFLAGS'
 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
+else
+  wx_cv_func_backtrace=no
+
+fi
+
+
 
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $wx_cv_func_backtrace" >&5
 $as_echo "$wx_cv_func_backtrace" >&6; }
 
-
     if test "$wx_cv_func_backtrace" = "no"; then
         { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: backtrace() is not available, wxStackWalker will not be available" >&5
 $as_echo "$as_me: WARNING: backtrace() is not available, wxStackWalker will not be available" >&2;}
diff --git a/configure.in b/configure.in
index b1c305a5dd..20a45a24d4 100644
--- a/configure.in
+++ b/configure.in
@@ -4366,23 +4366,26 @@ dnl backtrace() and backtrace_symbols() for wxStackWalker
 if test "$wxUSE_STACKWALKER" = "yes" -a "$wxUSE_UNIX" = "yes"; then
     AC_CACHE_CHECK([for backtrace() in <execinfo.h>], wx_cv_func_backtrace,
         [
-            AC_LANG_PUSH(C++)
-            AC_TRY_COMPILE([#include <execinfo.h>],
+            AC_SEARCH_LIBS(backtrace, execinfo,
                 [
-                    void *trace[1];
-                    char **messages;
-
-                    backtrace(trace, 1);
-                    messages = backtrace_symbols(trace, 1);
+                    AC_LANG_PUSH(C++)
+                    AC_TRY_LINK([#include <execinfo.h>],
+                        [
+                            void *trace[1];
+                            char **messages;
+                            backtrace(trace, 1);
+                            messages = backtrace_symbols(trace, 1);
+                        ],
+                        wx_cv_func_backtrace=yes,
+                        wx_cv_func_backtrace=no
+                    )
+                    AC_LANG_POP()
                 ],
-                wx_cv_func_backtrace=yes,
                 wx_cv_func_backtrace=no
             )
-            AC_LANG_POP()
         ]
     )
 
-
     if test "$wx_cv_func_backtrace" = "no"; then
         AC_MSG_WARN([backtrace() is not available, wxStackWalker will not be available])
         wxUSE_STACKWALKER=no
-- 
2.45.2