build: fix reproducibility re. -fdebug-prefix-map

If CFLAGS contains something like `-fdebug-prefix-map=/build/path=.`, we
need to remove it from CONFIG_ARGS so it doesn't get baked into `show
version`.  Otherwise, build becomes non-reproducible if the build path
changes.  To avoid other things creeping in, let's just remove *FLAGS in
their entirety.  (Not really reliable information anyway.)

With this commit, FRR build should be 100% reproducible.

Signed-off-by: David Lamparter <equinox@diac24.net>

diff --git a/configure.ac b/configure.ac
index 559b8088aeb745912d15f26a388564463e026826..c424511612fee2abddfed04dac5164fd1a6c9786 100755 (executable)
--- a/configure.ac
+++ b/configure.ac
@@ -13,7 +13,7 @@ AC_SUBST(PACKAGE_URL)
 PACKAGE_FULLNAME="FRRouting"
 AC_SUBST(PACKAGE_FULLNAME)
 
-CONFIG_ARGS="$ac_configure_args"
+CONFIG_ARGS="`echo $ac_configure_args | sed -e \"s% '[[A-Z]]*FLAGS=[[^']]\+'%%g\"`"
 AC_SUBST(CONFIG_ARGS)
 
 AC_CONFIG_SRCDIR(lib/zebra.h)