| # | |
| # 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 | |
| ]) |