-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 According to Paul Eggert on 3/1/2006 11:28 AM: > "Gary V. Vaughan" <[EMAIL PROTECTED]> writes: > >> i) Let's just improve AC_CHECK_HEADERS (et al) to always make configure >> smaller and faster by despatching to (undocumented internal) >> _AC_CHECK_HEADERS_ONCE when it can. > > Won't that break old scripts? If they do something like this:
Not just old scripts. Read on. > > if test $ac_feature_foo = yes; then > AC_CHECK_HEADERS([sys/param.h]) > fi > > then we'd hoist the test for sys/param.h out of the then-part, which > is not what was intended. Indeed, my recent patch for gnulib's m4/sys_socket_h.m4 relies on the AC_CHECK_HEADERS *NOT* being run when expanded inside a conditional, since on cygwin, the header winsock2.h exists but is incompatible with sys/socket.h. If we used AC_CHECK_HEADERS_ONCE in that case, then cygwin would get annoying warning messages from CVS head coreutils that a header is present but cannot be compiled. - -- Life is short - so eat dessert first! Eric Blake [EMAIL PROTECTED] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.1 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFECiXc84KuGfSFAYARAsH5AKCBfxKg5uBBouPtbR/IUNvRB8KgHACgi7j/ 46ffnGOpm1pgxZ4OC9tkH7k= =HSQU -----END PGP SIGNATURE----- _______________________________________________ bug-gnulib mailing list bug-gnulib@gnu.org http://lists.gnu.org/mailman/listinfo/bug-gnulib
