configure.ac: Add AC_HEADER_TIOCGWINSZ macro.

2013-06-01  Janus Weil  <janus@gcc.gnu.org>
	    Mikael Morin  <mikael@gcc.gnu.org>

	* configure.ac: Add AC_HEADER_TIOCGWINSZ macro.
	* config.in: Regenerated.
	* configure: Regenerated.


2013-06-01  Janus Weil  <janus@gcc.gnu.org>
	    Mikael Morin  <mikael@gcc.gnu.org>

	* error.c (get_terminal_width): Only limit the width if we're
	outputting to a terminal. Try to determine width via ioctl.

Co-Authored-By: Mikael Morin <mikael@gcc.gnu.org>

From-SVN: r199585

6 files changed, 111 insertions, 4 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3df45d8..d9ab9ea 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2013-06-01  Janus Weil  <janus@gcc.gnu.org>
+	    Mikael Morin  <mikael@gcc.gnu.org>
+
+	* configure.ac: Add AC_HEADER_TIOCGWINSZ macro.
+	* config.in: Regenerated.
+	* configure: Regenerated.
+
 2013-06-01  Jan Hubicka  <jh@suse.cz>
 
 	PR middle-end/57366
diff --git a/gcc/config.in b/gcc/config.in
index f122d48..288c11f 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -199,6 +199,12 @@
 #endif
 
 
+/* Define to 1 if `TIOCGWINSZ' requires <sys/ioctl.h>. */
+#ifndef USED_FOR_TARGET
+#undef GWINSZ_IN_SYS_IOCTL
+#endif
+
+
 /* mcontext_t fields start with __ */
 #ifndef USED_FOR_TARGET
 #undef HAS_MCONTEXT_T_UNDERSCORES
@@ -1247,7 +1253,7 @@
 #endif
 
 
-/* Define if your AIX linker supports a large TOC. */
+/* Define if your PowerPC64 linker supports a large TOC. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_LD_LARGE_TOC
 #endif
diff --git a/gcc/configure b/gcc/configure
index 1f03eac..8c22107 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -8293,6 +8293,66 @@ $as_echo "#define HAVE_SYS_WAIT_H 1" >>confdefs.h
 
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether termios.h defines TIOCGWINSZ" >&5
+$as_echo_n "checking whether termios.h defines TIOCGWINSZ... " >&6; }
+if test "${ac_cv_sys_tiocgwinsz_in_termios_h+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <sys/types.h>
+#include <termios.h>
+#ifdef TIOCGWINSZ
+  yes
+#endif
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "yes" >/dev/null 2>&1; then :
+  ac_cv_sys_tiocgwinsz_in_termios_h=yes
+else
+  ac_cv_sys_tiocgwinsz_in_termios_h=no
+fi
+rm -f conftest*
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_sys_tiocgwinsz_in_termios_h" >&5
+$as_echo "$ac_cv_sys_tiocgwinsz_in_termios_h" >&6; }
+
+if test $ac_cv_sys_tiocgwinsz_in_termios_h != yes; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether sys/ioctl.h defines TIOCGWINSZ" >&5
+$as_echo_n "checking whether sys/ioctl.h defines TIOCGWINSZ... " >&6; }
+if test "${ac_cv_sys_tiocgwinsz_in_sys_ioctl_h+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#ifdef TIOCGWINSZ
+  yes
+#endif
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "yes" >/dev/null 2>&1; then :
+  ac_cv_sys_tiocgwinsz_in_sys_ioctl_h=yes
+else
+  ac_cv_sys_tiocgwinsz_in_sys_ioctl_h=no
+fi
+rm -f conftest*
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_sys_tiocgwinsz_in_sys_ioctl_h" >&5
+$as_echo "$ac_cv_sys_tiocgwinsz_in_sys_ioctl_h" >&6; }
+
+  if test $ac_cv_sys_tiocgwinsz_in_sys_ioctl_h = yes; then
+
+$as_echo "#define GWINSZ_IN_SYS_IOCTL 1" >>confdefs.h
+
+  fi
+fi
+
 for ac_header in limits.h stddef.h string.h strings.h stdlib.h time.h iconv.h \
 		 fcntl.h unistd.h sys/file.h sys/time.h sys/mman.h \
 		 sys/resource.h sys/param.h sys/times.h sys/stat.h \
@@ -17834,7 +17894,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 17837 "configure"
+#line 17897 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -17940,7 +18000,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 17943 "configure"
+#line 18003 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 855affd..41b64c7 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -939,6 +939,7 @@ AC_HEADER_STDC
 AC_HEADER_TIME
 ACX_HEADER_STRING
 AC_HEADER_SYS_WAIT
+AC_HEADER_TIOCGWINSZ
 AC_CHECK_HEADERS(limits.h stddef.h string.h strings.h stdlib.h time.h iconv.h \
 		 fcntl.h unistd.h sys/file.h sys/time.h sys/mman.h \
 		 sys/resource.h sys/param.h sys/times.h sys/stat.h \
diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index 4d76a44..2043691 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,9 @@
+2013-06-01  Janus Weil  <janus@gcc.gnu.org>
+	    Mikael Morin  <mikael@gcc.gnu.org>
+
+	* error.c (get_terminal_width): Only limit the width if we're
+	outputting to a terminal. Try to determine width via ioctl.
+
 2013-06-01  Tobias Burnus  <burnus@net-b.de>
 
 	* decl.c (add_global_entry): Take locus.
diff --git a/gcc/fortran/error.c b/gcc/fortran/error.c
index ee0dea0..35fe627 100644
--- a/gcc/fortran/error.c
+++ b/gcc/fortran/error.c
@@ -30,6 +30,15 @@ along with GCC; see the file COPYING3.  If not see
 #include "flags.h"
 #include "gfortran.h"
 
+#ifdef HAVE_TERMIOS_H
+# include <termios.h>
+#endif
+
+#ifdef GWINSZ_IN_SYS_IOCTL
+# include <sys/ioctl.h>
+#endif
+
+
 static int suppress_errors = 0;
 
 static int warnings_not_errors = 0; 
@@ -59,9 +68,26 @@ gfc_pop_suppress_errors (void)
 }
 
 
+/* Determine terminal width (for trimming source lines in output).  */
+
 static int
 get_terminal_width (void)
 {
+  /* Only limit the width if we're outputting to a terminal.  */
+#ifdef HAVE_UNISTD_H
+  if (!isatty (STDERR_FILENO))
+    return INT_MAX;
+#endif
+  
+  /* Method #1: Use ioctl (not available on all systems).  */
+#ifdef TIOCGWINSZ
+  struct winsize w;
+  w.ws_col = 0;
+  if (ioctl (0, TIOCGWINSZ, &w) == 0 && w.ws_col > 0)
+    return w.ws_col;
+#endif
+
+  /* Method #2: Query environment variable $COLUMNS.  */
   const char *p = getenv ("COLUMNS");
   if (p)
     {
@@ -69,7 +95,8 @@ get_terminal_width (void)
       if (value > 0)
 	return value;
     }
-  /* Use a reasonable default.  */
+
+  /* If both fail, use reasonable default.  */
   return 80;
 }