linux-ext4 - Re: [PATCH XFSPROGS 2/3] Build without enabling DEBUG by default

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Date:	Fri, 22 Jul 2011 18:34:58 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>, xfs@....sgi.com
Subject: Re: [PATCH XFSPROGS 2/3] Build without enabling DEBUG by default

On Fri, Jul 22, 2011 at 02:38:30PM -0400, Christoph Hellwig wrote:
> 
> You can get most of this by simply using make V=1, not just in xfsprogs,
> but in most projects using silent make output (including those using
> automake)

Yeah, I know about V=1 (and I have been using it), but I wanted to
know which of the many Makefile variables which finally make up
$(CFLAGS) was getting set to which value, and V=1 doesn't do this.

> for me.  The biggest thing is that you have another directory in your
> include path.  How did you add that one? Did you add anything else
> special to the ./configure or make command lines?

Yes I needed it because I wanted to do a hermetic build; that is, I
didn't want to depend on the version of the acl, attr, dmapi, etc.,
shipped by the distribution.  (This is actually more important when
building xfstests, since I wanted to make sure we used the version of
the xfsprogs headers shipped by the very tip of xfsprogs-dev, since in
the past I've had problems because the distro-shipped header files
were too old.)

The way I did that was by setting the environment CFLAGS to
-I/kbuild/xfstests/bld/include.  And that seems to be the problem.  If
CFLAGS is set as an environment variable, then it's set as a :=, which
means that CFLAGS is set right away, the first time buildmacros is
included.

How about this instead?  A patch like this so that CFLAGS can be
remembered at configure time:

diff --git a/include/builddefs.in b/include/builddefs.in
index 4c8ec64..81ebfcd 100644
--- a/include/builddefs.in
+++ b/include/builddefs.in
@@ -25,6 +25,7 @@ OPTIMIZER = @opt_build@
 MALLOCLIB = @malloc_lib@
 LOADERFLAGS = @LDFLAGS@
 LTLDFLAGS = @LDFLAGS@
+CFLAGS = @CFLAGS@

 LIBRT = @librt@
 LIBUUID = @libuuid@

Then I don't have to set an environment variable when running make; I
just have to pass it to configure.

							- Ted
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