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libpng-config isn't SYSROOT aware, which is bad if you try to package it, for example in a cross build system.~/
patch that fixes the issue
I forwarded the request to email@example.com. Thanks for the patch.
Don't libdir and includedir also need to be modified?
I've made libpng-1.5.0alpha01 (in the "alpha" branch of
the GIT repository) sysroot-aware.
They don't use the $SYSROOT environment variable
that was suggested.
libpng-config.in takes a --sysroot=DIR option, with "" as
the default value.
libpng.pc.in also takes a --sysroot=DIR option, with
$PKG_CONFIG_SYSROOT_DIR as the default value.
Further modifications are probably needed, to CMakeLists.txt,
the configure scripts, and the scripts/makefiles, to
use the --sysroot option properly.
I HAVE NOT TESTED THIS except to verify that things
still work when the --sysroot option or the
PKG_CONFIG_SYSROOT_DIR environment variable is not
Thanks for the commit; I'd like to test the branch, but unfortunately there are some issues.
1) The sourceforge git doesn't contain the branches (like alpha). So I checked it out with
git checkout 8c8e58a2ee673b5dbd79c3d18c3a43680e917a87
2) The tree seems to be in a strange shape: after running "sh autogen.sh", I get this when I try to
package it for testing in my build system:
rsc@thebe:libpng$ make dist
make: *** No rule to make target `dist'. Stop.
3) If I try to build "as it is", without running autogen, I get this:
rsc@thebe:libpng$ ./configure && make
(cd .libs && rm -f libpng14.la && ln -s ../libpng14.la libpng14.la)
make: *** No rule to make target `libpng14-config', needed by `all-am'. Stop.
make: Leaving directory `/home/rsc/git/libpng'
make: *** [all] Error 2
Do you have an idea what may be wrong?
1) I don't know what that is about. Sourceforge branches are in a "libpng" subdirectory.
You should see branches "master", "devel", "stable", and "alpha".
2) There might not be a "dist" target. I see "distclean:" but no "dist:" in Makefile.in
3) It was still (partly) trying to build libpng14 instead of libpng15. I think that is fixed now; try again.
libpng-config.in doesn't has any parser for the --sysroot option, thus it won't work.
IMHO adding an option to libpng-config isn't such a good idea, because it requires "fixing" each packet using it. With the proposed approach it's not possible to set a default without the --sysroot option from outside.
Thanks for your feedback.
> 1) I don't know what that is about. Sourceforge branches are in a "libpng"
> You should see branches "master", "devel", "stable", and "alpha".
Ah, sorry, pilot error.
> 2) There might not be a "dist" target. I see "distclean:" but no "dist:"
> in Makefile.in
Automake *always* generates a 'make dist' target. It is usually be used to actually create your distribution tarball. In fact, you should use 'make distcheck' (which builds the tarball, extracts it, makes it read-only and performs an out-of-tree build).
However, it doesn't seem to be your favourite method to create tarballs :-) Are you interested in patches in that area?
> 3) It was still (partly) trying to build libpng14 instead of libpng15. I
> think that is fixed now; try again.
Builds now, compile-tested on arm1136, thanks.
the .pc file fix doesn't work either:
[frogger@hardanger:local]$ export PKG_CONFIG_SYSROOT_DIR=/foo/bar
[frogger@hardanger:local]$ export PKG_CONFIG_LIBDIR=/tmp/install/usr/local/lib/pkgconfig
[frogger@hardanger:local]$ ~/pengutronix/bsp/OSELAS.BSP-Pengutronix-AllYes-trunk/platform-ARM-reference/sysroot-host/bin/pkg-config --cflags libpng
Variable 'PKG_CONFIG_SYSROOT_DIR' not defined in '/tmp/install/usr/local/lib/pkgconfig/libpng.pc'
If I understand pkg-config correct, you don't have to fiddle around with PKG_CONFIG_SYSROOT_DIR in your .pc files. pkg-config does this transparently for you. With the attached patch in works for me.....
From 5c183c639d9fa7037c19883bb6559582478e0a52 Mon Sep 17 00:00:00 2001
From: Marc Kleine-Budde <firstname.lastname@example.org>
Date: Sun, 3 Jan 2010 01:25:11 +0100
Subject: [PATCH] libpng.pc.in: don't fiddle with PKG_CONFIG_SYSROOT_DIR
pkg-config does this for you transparently.
Signed-off-by: Marc Kleine-Budde <email@example.com>
libpng.pc.in | 9 ++++-----
1 files changed, 4 insertions(+), 5 deletions(-)
diff --git a/libpng.pc.in b/libpng.pc.in
index 4ba1c62..3e7e2c5 100644
@@ -1,8 +1,7 @@
Description: Loads and saves PNG files
The discussion on png-mng-implement (and marc's comment) leads me to believe
that it would be a mistake to put sysroot processing in any foo.pc. The change
in libpng_alpha, which I'm about to remove, would work on old versions of
pkg-config that don't recognize the variable, but the current version would
end up prepending the directory twice, once by libpng.pc and again by
...or it wouldn't work at all, as marc observed!
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