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Diffstat (limited to 'm4/realloc.m4')
| -rw-r--r-- | m4/realloc.m4 | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/m4/realloc.m4 b/m4/realloc.m4 new file mode 100644 index 0000000..bfbef0c --- /dev/null +++ b/m4/realloc.m4 @@ -0,0 +1,35 @@ +#serial 3 + +dnl From Jim Meyering. +dnl Determine whether realloc works when both arguments are 0. +dnl If it doesn't, arrange to use the replacement function. +dnl + +AC_DEFUN(jm_FUNC_REALLOC, +[ + dnl xmalloc.c requires that this symbol be defined so it doesn't + dnl mistakenly use a broken realloc -- as it might if this test were omitted. + AC_DEFINE_UNQUOTED(HAVE_DONE_WORKING_REALLOC_CHECK, 1, + [Define if the realloc check has been performed. ]) + + AC_CACHE_CHECK([for working realloc], jm_cv_func_working_realloc, + [AC_TRY_RUN([ + char *realloc (); + int + main () + { + exit (realloc (0, 0) ? 0 : 1); + } + ], + jm_cv_func_working_realloc=yes, + jm_cv_func_working_realloc=no, + dnl When crosscompiling, assume realloc is broken. + jm_cv_func_working_realloc=no) + ]) + if test $jm_cv_func_working_realloc = no; then + AC_SUBST(LIBOBJS) + LIBOBJS="$LIBOBJS realloc.$ac_objext" + AC_DEFINE_UNQUOTED(realloc, rpl_realloc, + [Define to rpl_realloc if the replacement function should be used.]) + fi +]) |