Improve GDB support for FreeBSD host/target.

To configure.in: make PRINTF_HAS_LONG_LONG check more pedantic; check
that SCANF_HAS_LONG_DOUBLE instead of assuming PRINTF_HAS_LONG_DOUBLE
implies it; document.

gdb/ChangeLog

@@ -1,3 +1,21 @@
+Mon Nov 24 08:59:28 1997  Andrew Cagney  <cagney@b1.cygnus.com>
+
+	* config/i386/tm-fbsd.h: New file.
+	* config/i386/fbsd.mt (TM_FILE): Change to tm-fbsd.h.
+
+	* config/i386/nm-fbsd.h (FLOAT_INFO): Move definition from here.
+ 	* config/i386/tm-fbsd.h (FLOAT_INFO): To here.
+
+	* configure.in (PRINTF_HAS_LONG_LONG): Check full functionality of
+ 	%ll format specifier.
+	(SCANF_HAS_LONG_DOUBLE): Check the scanf family for support of
+ 	long double using %Lg.
+	* acconfig.h: Provide default undef for SCANF_HAS_LONG_DOUBLE.
+	* configure: Re-generate.
+	
+	* c-exp.y (parse_number): Use sscanf %Lg when host has
+ 	SCANF_HAS_LONG_DOUBLE not PRINTF_HAS_LONG_DOUBLE
+
 Sun Nov 23 17:12:58 1997  Andrew Cagney  <cagney@b1.cygnus.com>
 
 	* printcmd.c (print_insn): Set the machine type if known.

gdb/acconfig.h

@@ -24,6 +24,9 @@
 /* Define if the "%Lg" format works to print long doubles. */
 #undef PRINTF_HAS_LONG_DOUBLE
 
+/* Define if the "%Lg" format works to scan long doubles. */
+#undef SCANF_HAS_LONG_DOUBLE
+
 /* Define if using Solaris thread debugging.  */
 #undef HAVE_THREAD_DB_LIB
 

gdb/c-exp.y

@@ -936,7 +936,7 @@ parse_number (p, len, parsed_float, putithere)
 	num = sscanf (p, "%lg%c", (double *) &putithere->typed_val_float.dval,&c);
       else
 	{
-#ifdef PRINTF_HAS_LONG_DOUBLE
+#ifdef SCANF_HAS_LONG_DOUBLE
 	  num = sscanf (p, "%Lg%c", &putithere->typed_val_float.dval,&c);
 #else
 	  /* Scan it into a double, then assign it to the long double.

gdb/config/i386/tm-fbsd.h

@@ -0,0 +1,32 @@
+/* Target macro definitions for i386 running FreeBSD
+   Copyright (C) 1997 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "i386/tm-i386bsd.h"
+
+
+#undef NUM_REGS
+#define NUM_REGS 14
+
+
+#undef IN_SOLIB_CALL_TRAMPOLINE
+#define IN_SOLIB_CALL_TRAMPOLINE(pc, name) STREQ (name, "_DYNAMIC")
+
+
+extern i386_float_info ();
+#define FLOAT_INFO  i386_float_info ()

gdb/configure.in

@@ -119,10 +119,14 @@ AC_MSG_CHECKING(for long long support in printf)
 AC_CACHE_VAL(gdb_cv_printf_has_long_long,
 [AC_TRY_RUN([
 int main () {
-  char buf[16];
-  long long l = 0x12345;
-  sprintf (buf, "%llx", l);
-  return (strcmp ("12345", buf));
+  char buf[32];
+  long long l = 0;
+  l = (l << 16) + 0x0123;
+  l = (l << 16) + 0x4567;
+  l = (l << 16) + 0x89ab;
+  l = (l << 16) + 0xcdef;
+  sprintf (buf, "0x%016llx", l);
+  return (strcmp ("0x0123456789abcdef", buf));
 }],
 gdb_cv_printf_has_long_long=yes,
 gdb_cv_printf_has_long_long=no,
@@ -164,6 +168,25 @@ if test $gdb_cv_printf_has_long_double = yes; then
 fi
 AC_MSG_RESULT($gdb_cv_printf_has_long_double)
 
+dnl See if the compiler and runtime support scanning long doubles
+
+AC_MSG_CHECKING(for long double support in scanf)
+AC_CACHE_VAL(gdb_cv_scanf_has_long_double,
+[AC_TRY_RUN([
+int main () {
+  char *buf = "3.141592653";
+  long double f = 0;
+  sscanf (buf, "%Lg", &f);
+  return !(f > 3.14159 && f < 3.14160);
+}],
+gdb_cv_scanf_has_long_double=yes,
+gdb_cv_scanf_has_long_double=no,
+gdb_cv_scanf_has_long_double=no)])
+if test $gdb_cv_scanf_has_long_double = yes; then
+  AC_DEFINE(SCANF_HAS_LONG_DOUBLE)
+fi
+AC_MSG_RESULT($gdb_cv_scanf_has_long_double)
+
 AC_FUNC_MMAP
 
 BFD_NEED_DECLARATION(malloc)

gdb/doc/ChangeLog

@@ -1,3 +1,8 @@
+Mon Nov 24 13:55:21 1997  Andrew Cagney  <cagney@b1.cygnus.com>
+
+	* gdbint.texinfo (Host Conditionals): Document
+ 	PRINTF_HAS_LONG_DOUBLE, SCANF_HAS_LONG_DOUBLE, HAVE_LONG_DOUBLE.
+
 Fri Jul  4 14:52:31 1997  Ian Lance Taylor  <ian@cygnus.com>
 
 	* gdbint.texinfo (Host Conditionals): Add CRLF_SOURCE_LINES.