[gegl] Bug 631183 - failure to compile gegl-buffer due to unavailable backtrace

[Martin Nordholts <martinn src gnome org>]

commit ef633285385e8fcb7b8aded46e3e2b74aaecbc0e
Author: Martin Nordholts <martinn src gnome org>
Date:   Sat Oct 2 20:55:33 2010 +0200

    Bug 631183 - failure to compile gegl-buffer due to unavailable backtrace
    
    Not all platforms have backtrace() facility, such as Darwin <=10.4 and
    Solaris.
    
    See also
    https://trac.macports.org/browser/trunk/dports/graphics/gegl/files/patch-gegl-buffer-gegl-buffer.c.diff?rev=71233
    
    This patch uses a configure check to disable it based on existance of
    execinfo.h instead of hardcoded knowledge about the target platforms.

 configure.ac              |    1 +
 gegl/buffer/gegl-buffer.c |    6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6f4da7d..94e4960 100644
--- a/configure.ac
+++ b/configure.ac
@@ -986,6 +986,7 @@ AM_CONDITIONAL(HAVE_UMFPACK, test "x$have_umfpack" = "xyes")
 AC_SUBST(UMFPACK_CFLAGS)
 AC_SUBST(UMFPACK_LIBS)
 
+AC_CHECK_HEADERS([execinfo.h])
 
 #######################
 # Check for other items
diff --git a/gegl/buffer/gegl-buffer.c b/gegl/buffer/gegl-buffer.c
index 91f4aa3..8c5db72 100644
--- a/gegl/buffer/gegl-buffer.c
+++ b/gegl/buffer/gegl-buffer.c
@@ -80,7 +80,7 @@
 /* #define GEGL_BUFFER_DEBUG_ALLOCATIONS to print allocation stack
  * traces for leaked GeglBuffers using GNU C libs backtrace_symbols()
  */
-#ifndef G_OS_WIN32
+#ifdef HAVE_EXECINFO_H
 #include <execinfo.h>
 #endif
 
@@ -857,8 +857,8 @@ static gchar *
 gegl_buffer_get_alloc_stack (void)
 {
   char  *result         = NULL;
-#ifdef G_OS_WIN32
-  result = g_strdup ("backtrack not available on win32\n");
+#ifndef HAVE_EXECINFO_H
+  result = g_strdup ("backtrack not available for this platform\n");
 #else
   void  *functions[MAX_N_FUNCTIONS];
   int    n_functions    = 0;