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Diffstat (limited to 'm4/malloc.m4')
| -rw-r--r-- | m4/malloc.m4 | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/m4/malloc.m4 b/m4/malloc.m4 new file mode 100644 index 0000000..4978eaf --- /dev/null +++ b/m4/malloc.m4 @@ -0,0 +1,35 @@ +#serial 3 + +dnl From Jim Meyering. +dnl Determine whether malloc accepts 0 as its argument. +dnl If it doesn't, arrange to use the replacement function. +dnl + +AC_DEFUN(jm_FUNC_MALLOC, +[ + dnl xmalloc.c requires that this symbol be defined so it doesn't + dnl mistakenly use a broken malloc -- as it might if this test were omitted. + AC_DEFINE_UNQUOTED(HAVE_DONE_WORKING_MALLOC_CHECK, 1, + [Define if the malloc check has been performed. ]) + + AC_CACHE_CHECK([for working malloc], jm_cv_func_working_malloc, + [AC_TRY_RUN([ + char *malloc (); + int + main () + { + exit (malloc (0) ? 0 : 1); + } + ], + jm_cv_func_working_malloc=yes, + jm_cv_func_working_malloc=no, + dnl When crosscompiling, assume malloc is broken. + jm_cv_func_working_malloc=no) + ]) + if test $jm_cv_func_working_malloc = no; then + AC_SUBST(LIBOBJS) + LIBOBJS="$LIBOBJS malloc.$ac_objext" + AC_DEFINE_UNQUOTED(malloc, rpl_malloc, + [Define to rpl_malloc if the replacement function should be used.]) + fi +]) |