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| author | Reid Spencer <rspencer@reidspencer.com> | 2004-09-07 06:56:14 +0000 |
|---|---|---|
| committer | Reid Spencer <rspencer@reidspencer.com> | 2004-09-07 06:56:14 +0000 |
| commit | 491f6812ef173989612d987fa8706fd38e2e673f (patch) | |
| tree | 0ba6404a9be355d9bbd5e526efe32e3b0bc29afa /autoconf/m4/c_printf_a.m4 | |
| parent | 10c0a2e7f955cbe6cc8c842e6d8aebc10ac91f4c (diff) | |
Individual autoconf function broken out of acincludes.m4. This change
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
Diffstat (limited to 'autoconf/m4/c_printf_a.m4')
| -rw-r--r-- | autoconf/m4/c_printf_a.m4 | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/autoconf/m4/c_printf_a.m4 b/autoconf/m4/c_printf_a.m4 new file mode 100644 index 0000000000..62ed2ac8d7 --- /dev/null +++ b/autoconf/m4/c_printf_a.m4 @@ -0,0 +1,31 @@ +# +# 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 +]) |