diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index ea0e3eb18..b093d0af6 100644 --- a/configure.ac +++ b/configure.ac @@ -619,6 +619,18 @@ AC_DEFINE([HAVE_GCC_ATOMICS], 1, [Define to 1 if your GCC C compiler provides at AC_MSG_RESULT(no) ) +# glibc, AFAIK, is the only C library that makes printing a NULL to a string safe. +AC_MSG_CHECKING([if your system printf is NULL-safe.]) +AC_RUN_IFELSE( + AC_LANG_PROGRAM([#include <stdio.h>], + [printf("%s", NULL)]), + AC_DEFINE([HAVE_NULLSAFE_PRINTF], 1, [Define to 1 if your C library can safely print NULL to string formats.]) + AC_MSG_RESULT(yes), + AC_MSG_RESULT(no), + # It's unlikely an embedded system will have this. + AC_MSG_RESULT(unknown) +) + AST_GCC_ATTRIBUTE(pure) AST_GCC_ATTRIBUTE(malloc) AST_GCC_ATTRIBUTE(const) |