diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 1f9ba21..f2510ce 100644 --- a/configure.in +++ b/configure.in @@ -582,6 +582,32 @@ AC_MSG_RESULT($ac_cv_func_getopt) test $ac_cv_func_getopt = no && LIBOBJS="$LIBOBJS getopt.o" AC_SUBST(LIBOBJS)dnl +# check whether malloc(0) returns NULL or not +AC_SUBST(MALLOC_ZERO_RETURNS_NULL) +AC_MSG_CHECKING(what malloc(0) returns) +AC_CACHE_VAL(ac_cv_malloc_zero, +[AC_TRY_RUN([#include <stdio.h> +#ifdef HAVE_STDLIB +#include <stdlib.h> +#else +char *malloc(), *realloc(); +int *free(); +#endif +main() { + char *p; + p = malloc(0); + if (p == NULL) exit(1); + p = realloc(p, 0); + if (p == NULL) exit(1); + free(p); + exit(0); +}], ac_cv_malloc_zero=nonnull, ac_cv_malloc_zero=null)]) +AC_MSG_RESULT($ac_cv_malloc_zero) +if test "$ac_cv_malloc_zero" = null +then + AC_DEFINE(MALLOC_ZERO_RETURNS_NULL) +fi + # generate output files AC_OUTPUT(Makefile \ Objects/Makefile \ |