[gimp] windows: Add support for generating crash backtraces using Dr. MingW

[Mukund Sivaraman <muks src gnome org>]

commit 6a6604871fe9493cb0f7ec331d0629a4a4764973
Author: Mukund Sivaraman <muks banu com>
Date:   Mon Aug 31 18:56:51 2015 +0530

    windows: Add support for generating crash backtraces using Dr. MingW

 app/Makefile.am     |    6 ++++++
 app/main.c          |   37 +++++++++++++++++++++++++++++++++++++
 configure.ac        |   12 ++++++++++++
 libgimp/Makefile.am |    5 +++++
 libgimp/gimp.c      |   37 +++++++++++++++++++++++++++++++++++++
 5 files changed, 97 insertions(+), 0 deletions(-)
---
diff --git a/app/Makefile.am b/app/Makefile.am
index f46ef97..acd124f 100644
--- a/app/Makefile.am
+++ b/app/Makefile.am
@@ -92,6 +92,11 @@ endif
 
 if OS_WIN32
 win32_ldflags = -mwindows -Wl,--tsaware $(WIN32_LARGE_ADDRESS_AWARE)
+
+if HAVE_EXCHNDL
+exchndl = -lexchndl
+endif
+
 else
 libm = -lm
 endif
@@ -186,6 +191,7 @@ gimp_ GIMP_APP_VERSION@_LDADD = \
        $(GTK_MAC_INTEGRATION_LIBS)     \
        $(DBUS_GLIB_LIBS)               \
        $(gimpconsoleldadd)             \
+       $(exchndl)                      \
        $(GIMPRC)
 
 
diff --git a/app/main.c b/app/main.c
index c3c1dba..f498a79 100644
--- a/app/main.c
+++ b/app/main.c
@@ -35,8 +35,14 @@
 
 #ifdef G_OS_WIN32
 #include <io.h> /* get_osfhandle */
+
+#ifdef HAVE_EXCHNDL
+#include <time.h>
+#include <exchndl.h>
 #endif
 
+#endif /* G_OS_WIN32 */
+
 #ifndef GIMP_CONSOLE_COMPILATION
 #include <gdk/gdk.h>
 #else
@@ -354,6 +360,37 @@ main (int    argc,
     g_free (bin_dir);
   }
 
+#ifdef HAVE_EXCHNDL
+  /* Use Dr. Mingw (dumps backtrace on crash) if it is available. */
+  {
+    time_t t;
+    gchar *filename;
+    gchar *dir;
+    gchar *path;
+
+    /* This has to be the non-roaming directory (i.e., the local
+       directory) as backtraces correspond to the binaries on this
+       system. */
+    dir = g_build_filename (g_get_user_data_dir (),
+                            GIMPDIR, GIMP_USER_VERSION, "CrashLog",
+                            NULL);
+    /* Ensure the path exists. */
+    g_mkdir_with_parents (dir, 0700);
+
+    time (&t);
+    filename = g_strdup_printf ("%s-crash-%" G_GUINT64_FORMAT ".txt",
+                                g_get_prgname(), t);
+    path = g_build_filename (dir, filename, NULL);
+    g_free (filename);
+    g_free (dir);
+
+    ExcHndlInit ();
+    ExcHndlSetLogFileNameA (path);
+
+    g_free (path);
+  }
+#endif
+
 #ifndef _WIN64
   {
     typedef BOOL (WINAPI *t_SetProcessDEPPolicy) (DWORD dwFlags);
diff --git a/configure.ac b/configure.ac
index a909906..36305a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -785,6 +785,18 @@ PKG_CHECK_MODULES(HARFBUZZ, harfbuzz >= harfbuzz_required_version,,
 PKG_CHECK_MODULES(GEXIV2, gexiv2 >= gexiv2_required_version,,
                  [add_deps_error([gexiv2 >= gexiv2_required_version])])
 
+#####################
+# Check for Dr. Mingw
+#####################
+
+if test "x$platform_win32" = "xyes"; then
+   # Check for Dr. Mingw
+   AC_CHECK_LIB(exchndl, ExcHndlSetLogFileNameA,
+               [AC_DEFINE(HAVE_EXCHNDL, 1, [Define to 1 when Dr. MingW is available])]
+               )
+fi
+AM_CONDITIONAL(HAVE_EXCHNDL, test "x$ac_cv_lib_exchndl_ExcHndlSetLogFileNameA" = "xyes")
+
 ##########################################
 # Check for some special functions we need
 ##########################################
diff --git a/libgimp/Makefile.am b/libgimp/Makefile.am
index f857e59..ac154c5 100644
--- a/libgimp/Makefile.am
+++ b/libgimp/Makefile.am
@@ -17,6 +17,10 @@ framework_cocoa = -framework Cocoa
 endif
 
 if OS_WIN32
+if HAVE_EXCHNDL
+exchndl = -lexchndl
+endif
+
 gimp_def = gimp.def
 gimpui_def = gimpui.def
 libgimp_export_symbols = -export-symbols $(srcdir)/gimp.def
@@ -388,6 +392,7 @@ libgimp_ GIMP_API_VERSION@_la_LIBADD = \
        $(libgimpconfig)        \
        $(libgimpcolor)         \
        $(libgimpbase)          \
+       $(exchndl)              \
        $(CAIRO_LIBS)           \
        $(GEGL_LIBS)            \
        $(GDK_PIXBUF_LIBS)      \
diff --git a/libgimp/gimp.c b/libgimp/gimp.c
index b871909..1835fc9 100644
--- a/libgimp/gimp.c
+++ b/libgimp/gimp.c
@@ -53,6 +53,12 @@
 
 #ifndef G_OS_WIN32
 #include "libgimpbase/gimpsignal.h"
+
+#ifdef HAVE_EXCHNDL
+#include <time.h>
+#include <exchndl.h>
+#endif
+
 #else
 #include <signal.h>
 #endif
@@ -295,6 +301,37 @@ gimp_main (const GimpPlugInInfo *info,
     g_free (bin_dir);
   }
 
+#ifdef HAVE_EXCHNDL
+  /* Use Dr. Mingw (dumps backtrace on crash) if it is available. */
+  {
+    time_t t;
+    gchar *filename;
+    gchar *dir;
+    gchar *path;
+
+    /* This has to be the non-roaming directory (i.e., the local
+       directory) as backtraces correspond to the binaries on this
+       system. */
+    dir = g_build_filename (g_get_user_data_dir (),
+                            GIMPDIR, GIMP_USER_VERSION, "CrashLog",
+                            NULL);
+    /* Ensure the path exists. */
+    g_mkdir_with_parents (dir, 0700);
+
+    time (&t);
+    filename = g_strdup_printf ("%s-crash-%" G_GUINT64_FORMAT ".txt",
+                                g_get_prgname(), t);
+    path = g_build_filename (dir, filename, NULL);
+    g_free (filename);
+    g_free (dir);
+
+    ExcHndlInit ();
+    ExcHndlSetLogFileNameA (path);
+
+    g_free (path);
+  }
+#endif
+
 #ifndef _WIN64
   {
     typedef BOOL (WINAPI *t_SetProcessDEPPolicy) (DWORD dwFlags);