868d75dbdc
* 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
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