gfortran.h (gfc_option_t): Add flag_backtrace field.

	* gfortran.h (gfc_option_t): Add flag_backtrace field.
	* lang.opt: Add -fbacktrace option.
	* invoke.texi: Document the new option.
	* trans-decl.c (gfc_build_builtin_function_decls): Add new
	option to the call to set_std.
	* options.c (gfc_init_options, gfc_handle_option): Handle the
	new option.

	* runtime/backtrace.c: New file.
	* runtime/environ.c (variable_table): New GFORTRAN_ERROR_BACKTRACE
	environment variable.
	* runtime/compile_options.c (set_std): Add new argument.
	* runtime/main.c (store_exe_path, full_exe_path): New functions.
	* runtime/error.c (sys_exit): Add call to show_backtrace.
	* libgfortran.h (options_t): New backtrace field.
	(store_exe_path, full_exe_path, show_backtrace): New prototypes.
	* configure.ac: Add checks for execinfo.h, execvp, pipe, dup2,
	close, fdopen, strcasestr, getrlimit, backtrace, backtrace_symbols
	and getppid.
	* Makefile.am: Add runtime/backtrace.c.
	* fmain.c (main): Add call to store_exe_path.
	* Makefile.in: Renegerate.
	* config.h.in: Renegerate.
	* configure: Regenerate.

From-SVN: r122954

1 files changed, 44 insertions, 0 deletions

diff --git a/libgfortran/runtime/main.c b/libgfortran/runtime/main.c
index cfd77f2..76e4aef 100644
--- a/libgfortran/runtime/main.c
+++ b/libgfortran/runtime/main.c
@@ -32,9 +32,15 @@ Boston, MA 02110-1301, USA.  */
 #include <string.h>
 #include <math.h>
 #include <stddef.h>
+#include <limits.h>
 
+#include "config.h"
 #include "libgfortran.h"
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 /* Stupid function to be sure the constructor is always linked in, even
    in the case of static linking.  See PR libfortran/22298 for details.  */
 void
@@ -92,6 +98,44 @@ get_args (int *argc, char ***argv)
 }
 
 
+static const char *exe_path;
+
+/* Save the path under which the program was called, for use in the
+   backtrace routines.  */
+void
+store_exe_path (const char * argv0)
+{
+#ifndef PATH_MAX
+#define PATH_MAX 1024
+#endif
+
+#ifndef DIR_SEPARATOR   
+#define DIR_SEPARATOR '/'
+#endif
+
+  char buf[PATH_MAX], *cwd, *path;
+
+  if (argv0[0] == '/')
+    {
+      exe_path = argv0;
+      return;
+    }
+
+  cwd = getcwd (buf, sizeof (buf));
+
+  /* exe_path will be cwd + "/" + argv[0] + "\0" */
+  path = malloc (strlen (cwd) + 1 + strlen (argv0) + 1);
+  st_sprintf (path, "%s%c%s", cwd, DIR_SEPARATOR, argv0);
+  exe_path = path;
+}
+
+/* Return the full path of the executable.  */
+char *
+full_exe_path (void)
+{
+  return (char *) exe_path;
+}
+
 /* Initialize the runtime library.  */
 
 static void __attribute__((constructor))