blob: c5a1e1f84cd84c8588be1cc0c9bc4e772697974c [file] [log] [blame]
#
# 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_CACHE_CHECK([if printf has the %a format character],[llvm_cv_c_printf_a],
[AC_LANG_PUSH([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);]])],
llvm_cv_c_printf_a=yes,
llvmac_cv_c_printf_a=no,
llvmac_cv_c_printf_a=no)
AC_LANG_POP([C])])
if test "$llvm_cv_c_printf_a" = "yes"; then
AC_DEFINE([HAVE_PRINTF_A],[1],[Define to have the %a format string])
fi
])