ag_check_strcspn

Not all systems have strcspn(3). See if we need to substitute. To make this work, you have to do horrible things. In one of your Makefile.am files, you must make an explicit rule to make this object. It should look like this:

  strcspn.lo : $(top_srcdir)/compat/strcspn.c
      $(LTCOMPILE) -o $@ -c $(top_srcdir)/compat/strcspn.c

and you must include ``@COMPATOBJ@'' in a LIBADD somewhere and, finally, you must add another artificial dependency, something like:

  makeshell.lo : genshell.c @COMPATOBJ@

It is all pretty horrific, but I have found nothing else that works.

AC_DEFUN([AG_CHECK_STRCSPN],[
  AC_MSG_CHECKING([whether strcspn matches prototype and works])
  AC_CACHE_VAL([ag_cv_strcspn],[
  AC_TRY_RUN([#include <string.h>
int main (int argc, char** argv) {
   char zRej[] = "reject";
   char zAcc[] = "a-ok-eject";
   return strcspn( zAcc, zRej ) - 5;
}],[ag_cv_strcspn=yes],[ag_cv_strcspn=no],[ag_cv_strcspn=no]
  ) # end of TRY_RUN]) # end of CACHE_VAL

  AC_MSG_RESULT([$ag_cv_strcspn])
  if test x$ag_cv_strcspn = xyes
  then
    AC_DEFINE(HAVE_STRCSPN, 1,
       [Define this if strcspn matches prototype and works])
  else
    COMPATOBJ="$COMPATOBJ strcspn.lo"
  fi
]) # end of AC_DEFUN of AG_CHECK_STRCSPN

Copyright © 2001 Bruce Korb <bkorb@gnu.org>

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