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| author | John Criswell <criswell@uiuc.edu> | 2003-10-13 16:22:01 +0000 |
|---|---|---|
| committer | John Criswell <criswell@uiuc.edu> | 2003-10-13 16:22:01 +0000 |
| commit | a0137d3d825f4d562b55d4358d66e005c10eea01 (patch) | |
| tree | bf3ae883e7f2e0acbf609f79b6d07c70e503aeba /autoconf/aclocal.m4 | |
| parent | b5ca43e000427d220f90dc120502ad7b54392eca (diff) | |
| download | llvm-a0137d3d825f4d562b55d4358d66e005c10eea01.tar.gz llvm-a0137d3d825f4d562b55d4358d66e005c10eea01.tar.bz2 llvm-a0137d3d825f4d562b55d4358d66e005c10eea01.tar.xz | |
Added a macro and code that checks for the %a format string in sprintf().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9089 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'autoconf/aclocal.m4')
| -rw-r--r-- | autoconf/aclocal.m4 | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/autoconf/aclocal.m4 b/autoconf/aclocal.m4 index 51040fb523..da725af8a4 100644 --- a/autoconf/aclocal.m4 +++ b/autoconf/aclocal.m4 @@ -6166,4 +6166,33 @@ AC_DEFUN([AC_CONFIG_MAKEFILE], [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 +]) |