autoconf: Tolerate missing file when grepping.
authorJesse Gross <jesse@nicira.com>
Tue, 2 Nov 2010 23:00:16 +0000 (16:00 -0700)
committerJesse Gross <jesse@nicira.com>
Wed, 3 Nov 2010 00:23:22 +0000 (17:23 -0700)
commit7507ec485f72c2ec56731ee5c9790a20d6d694fd
treee9c54f7a5cc3d568f8d7dcc96b8599d209f413fe
parent0f9fc40325e390f23ef46cb2b3588da6b97ad5b1
autoconf: Tolerate missing file when grepping.

Currently we die when grepping for compatibility strings if the
file does not exist.  Since this can be a valid situation when
files are added in later versions, we shouldn't kill the build.
Instead, note that the file doesn't exist but otherwise treat it
as if the string was not found.
acinclude.m4