[Bug-gnulib] Re: final argp patch

[Paul Eggert]

Simon Josefsson <address@hidden> writes:

> if an application is written for argp 1 and glibc is changed in an
> incompatible way, I cannot see any way the (old) argp code in gnulib
> that is shipped with an application could detect this.

If you want it to depend on a version number in an include file, you
can have argp.m4 try to compile something like this program:

#include <gnu-versions.h>
#if _GNU_ARGP_INTERFACE_VERSION < 1
  #error "system argp interface is too old"
#endif

If it doesn't compile, then either the system lacks argp, or its
interface is too old.