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Re: libpng issues

From: Elias Mårtenson
Subject: Re: libpng issues
Date: Mon, 12 Feb 2018 12:32:48 +0800

Hello Paul,

Your fix for this (e9ca57cfcbaf1a8dfc6bde5a2afd5f3c7b357cb1) causes the build to fail on Arch Linux.
Rolling back that change makes the build work again.

Here's the error:

make[2]: Leaving directory '/home/emartenson/src/emacs/admin/charsets'
make -C ../admin/unidata charscript.el
make[2]: Entering directory '/home/emartenson/src/emacs/admin/unidata'
make[2]: Nothing to be done for 'charscript.el'.
make[2]: Leaving directory '/home/emartenson/src/emacs/admin/unidata'
  CCLD     temacs
/bin/ld: image.o: undefined reference to symbol 'png_longjmp@@PNG16_0'
/usr/lib/libpng16.so.16: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:606: temacs] Error 1
make[1]: Leaving directory '/home/emartenson/src/emacs/src'
make: *** [Makefile:418: src] Error 2


On 12 February 2018 at 10:45, Paul Eggert <address@hidden> wrote:
Werner LEMBERG wrote:

I've just been bitten by


For this reason I suggest two improvements for the configure script of

(1) Use `pkg-config' before `libpng-config' to detect libpng.

(2) If `libpng-config' is used, filter out `-L/usr/lib' and
     `-L/usr/lib64' (as suggested in issue #206).

Thanks, I installed the attached into master. It does (1), and as I understand it when (1) works then (2) is unnecessary. I'm hoping we don't have to do (2) as I worry that it might break things on some platforms.

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