mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 03:29:40 +00:00
491f6812ef
per the recommended style guide for autoconf and so that individual autoconf functions can more easily be shared across projects. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16223 91177308-0d34-0410-b5e6-96231b3b80d8
32 lines
984 B
Plaintext
32 lines
984 B
Plaintext
#
|
|
# 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_MSG_CHECKING([for printf %a format specifier])
|
|
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
|
|
AC_MSG_RESULT($ac_c_printf_a)
|
|
if test "$ac_c_printf_a" = "yes"; then
|
|
AC_DEFINE([HAVE_PRINTF_A],[1],[Define to have the %a format string])
|
|
fi
|
|
])
|