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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16415 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
775 B
Plaintext
33 lines
775 B
Plaintext
#
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# Determine if the printf() functions have the %a format character.
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# This is modified from:
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# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_slist.html
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AC_DEFUN([AC_C_PRINTF_A],[
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AC_MSG_CHECKING([for printf %a format specifier])
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AC_LANG_PUSH([C])
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AC_RUN_IFELSE([
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AC_LANG_PROGRAM([[
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#include <stdio.h>
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#include <stdlib.h>
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]],[[
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volatile double A, B;
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char Buffer[100];
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A = 1;
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A /= 10.0;
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sprintf(Buffer, "%a", A);
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B = atof(Buffer);
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if (A != B)
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return (1);
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if (A != 0x1.999999999999ap-4)
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return (1);
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return (0);]])],
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ac_c_printf_a=yes,
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ac_c_printf_a=no,
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ac_c_printf_a=no)
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AC_LANG_POP([C])
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AC_MSG_RESULT($ac_c_printf_a)
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if test "$ac_c_printf_a" = "yes"; then
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AC_DEFINE([HAVE_PRINTF_A],[1],[Define to have the %a format string])
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fi
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])
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