[llvm-commits] CVS: llvm/autoconf/aclocal.m4 configure.ac

[John Criswell]

Changes in directory llvm/autoconf:

aclocal.m4 updated: 1.6 -> 1.7
configure.ac updated: 1.41 -> 1.42

---
Log message:

Added a macro and code that checks for the %a format string in sprintf().



---
Diffs of the changes:  (+32 -0)

Index: llvm/autoconf/aclocal.m4
diff -u llvm/autoconf/aclocal.m4:1.6 llvm/autoconf/aclocal.m4:1.7
--- llvm/autoconf/aclocal.m4:1.6	Wed Oct  8 16:45:58 2003
+++ llvm/autoconf/aclocal.m4	Mon Oct 13 11:22:00 2003
@@ -6166,4 +6166,33 @@
 [AC_CONFIG_COMMANDS($1,${SHELL} ${srcdir}/autoconf/install-sh -c ${srcdir}/$1 $1,${srcdir}/autoconf/mkinstalldirs `dirname $1`)
 ])
 
+#
+# Determine if the printf() functions have the %a format character.
+# This is modified from:
+# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_slist.html
+AC_DEFUN([AC_C_PRINTF_A],
+[
+	AC_LANG_SAVE
+	AC_LANG_C
+	AC_RUN_IFELSE(
+		AC_LANG_PROGRAM([#include <stdio.h>
+		                 #include <stdlib.h>],
+		                 [[[
+		                 volatile double A, B;
+		                 char Buffer[100];
+		                 A = 1;
+		                 A /= 10.0;
+		                 sprintf(Buffer, "%a", A);
+		                 B = atof(Buffer);
+		                 if (A != B)
+							 return (1);
+		                 if (A != 0x1.999999999999ap-4)
+							 return (1);
+		                 return (0);]]]),
+		ac_c_printf_a=yes,ac_c_printf_a=no)
+	AC_LANG_RESTORE
+	if test "$ac_c_printf_a" = "yes"; then
+		AC_DEFINE([HAVE_PRINTF_A],[1],[Define to have the %a format string])
+	fi
+])
 


Index: llvm/autoconf/configure.ac
diff -u llvm/autoconf/configure.ac:1.41 llvm/autoconf/configure.ac:1.42
--- llvm/autoconf/configure.ac:1.41	Fri Oct 10 12:04:43 2003
+++ llvm/autoconf/configure.ac	Mon Oct 13 11:22:00 2003
@@ -455,6 +455,9 @@
 AC_HEADER_TIME
 AC_STRUCT_TM
 
+dnl Check for various C features
+AC_C_PRINTF_A
+
 dnl Check for C++ extensions
 AC_CXX_HAVE_EXT_HASH_MAP
 AC_CXX_HAVE_EXT_HASH_SET