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[PATCH,Fortran] RFC: Setup locale for Fortran programs

This patch initializes the locale system when using a Fortran main
program. For non-Fortran main programs that link to libgfortran this
is not done, as such programs are expeced to handle locales
themselves. Following the approach used by python
( ), if the user environment
uses the default C locale, it tries a few fallback options (C.UTF-8,
C.utf8, UTF-8) to set the LC_CTYPE to a UTF-8 locale.

This enables localized error messages for OS errors (strerror() etc.).

Currently this is done unconditionally when set_options() is called,
which is done by the Fortran main().  This should perhaps be handled
through the options array, in order to enable users to disable it,
e.g. for non-Fortran main programs that still want to properly
initialize libgfortran?

Regtested on x86_64-pc-linux-gnu, Ok for trunk?


2018-12-01  Janne Blomqvist  <>

	* runtime/compile_options.c (set_options): Initialize locale.
 libgfortran/runtime/compile_options.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/libgfortran/runtime/compile_options.c b/libgfortran/runtime/compile_options.c
index 1d37e7709df..02274c8251a 100644
--- a/libgfortran/runtime/compile_options.c
+++ b/libgfortran/runtime/compile_options.c
@@ -24,7 +24,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #include "libgfortran.h"
 #include <signal.h>
+#include <locale.h>
+#include <string.h>
 /* Useful compile-time options will be stored in here.  */
 compile_options_t compile_options;
@@ -161,6 +162,28 @@ set_options (int num, int options[])
     compile_options.fpe_summary = options[6];
+  /* Set the locale.  This is not selectable by a compile option, but
+     this should be setup only when using a Fortran main program, not
+     when loading libgfortran.  */
+  setlocale (LC_ALL, "");
+  char *ctype_loc = setlocale (LC_CTYPE, NULL);
+  if (ctype_loc && strcmp (ctype_loc, "C") == 0)
+    {
+      /* Try to set the LC_CTYPE to a locale supporting UTF-8 even if
+	 the environment specifies the default C locale.  This is
+	 similar to e.g. python (see PEP 538).  */
+      setlocale (LC_CTYPE, "C.UTF-8");
+      ctype_loc = setlocale (LC_CTYPE, NULL);
+      if (ctype_loc && strcmp (ctype_loc, "C") == 0)
+	{
+	  setlocale (LC_CTYPE, "C.utf8");
+	  ctype_loc = setlocale (LC_CTYPE, NULL);
+	  if (ctype_loc && strcmp (ctype_loc, "C") == 0)
+	    setlocale (LC_CTYPE, "UTF-8");
+	}
+    }
   /* If backtrace is required, we set signal handlers on the POSIX
      2001 signals with core action.  */
   if (compile_options.backtrace)

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