On Wed, 2014-02-26 at 19:36 +0000, Latham, Robert J. wrote:

On Wed, 2014-02-26 at 17:47 +0000, Balaji, Pavan wrote:

...

Note for MPICH developers: It’ll be good to figure out what exactly changed between 3.0.4 and 3.1 that is causing this. My understanding is that this check for warnings has been there in MPICH for a long time.

git-bisect is awesome for this sort of thing.

Pavan! % git bisect start v3.1 v3.0.4 Bisecting: 467 revisions left to test after this (roughly 9 steps) ... ccf7f70c3252d4e38933de00dd2f4bb49a389a61 is the first bad commit commit ccf7f70c3252d4e38933de00dd2f4bb49a389a61 Author: Pavan Balaji <[email protected]> Date: Sat May 18 22:38:40 2013 -0500 Warning squash for clang. For the VA_ARGS test, clang was accepting it in C89 mode, but throwing warnings. This causes configure to enable it, but the build to throw many warnings. This patch will disable VA_ARGS support unless the compiler can accept it without warnings. No reviewer. :040000 040000 cb59b5abfef07e8076e405141f701798ecde55f9 5727410f767d93a42a31cd461c37750e588223e0 M confdb bisect run success