--- Begin Message ---
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Subject: |
25.1; configure.ac libpng search error |
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Date: |
Sat, 24 Dec 2016 16:31:08 -0500 |
configure.ac uses libpng-config, if installed, to determine the include
directive for the PNG library. Unfortuately, it does not correctly use
libpng-config for the linker flags. Consequently, it may mismatch the
header file to the library. In my case, configure misdiagnosed my
setup, and recommended --no-png.
On my system, a libpng-config was installed by the Anaconda scientific
Python package distribution. Because I had allowed Anaconda to place
itself earlier in the path than /usr/bin, that is the version configure
used. I suspect the error I describe below has not been detected before
because my setup is unusual.
First, let's see what libpng-config has to say on my system:
$ for opt in cflags ldflags libs
do
cmd="libpng-config --$opt"
printf "%-25s: %-s\n" "$cmd" "$($cmd)"
done
libpng-config --cflags : -I/usr/local/anaconda/include/libpng16
libpng-config --ldflags : -L/usr/local/anaconda/lib -lpng16
libpng-config --libs : -lpng16
Now, let's look at how libpng-config is used in configure.ac:
$ grep -n libpng-config configure.ac
3412: png_cflags=`(libpng-config --cflags) 2>&AS_MESSAGE_LOG_FD` &&
3413: png_libs=`(libpng-config --libs) 2>&AS_MESSAGE_LOG_FD` || {
3414: # libpng-config does not work; configure by hand.
As you can see, png_libs relies on
libpng-config --libs
not
libpng-config --ldflags
The produced configure script therefore finds an include file under
ananconda, but does not provide the associated -L option to the
linker. The configure test fails because a symbol declared in the
header file is not supplied by the (older) libpng found by the linker.
I believe the fix is to change line 3413 of configure.ac to read:
png_libs=`(libpng-config --ldflags) 2>&AS_MESSAGE_LOG_FD` || {
although IMO that's not quite sufficient, because it doesn't set RPATH.
I worked around the problem before completely diagnosing it simply by
renaming /usr/local/anaconda to /usr/local/.anaconda, taking it out of
the PATH and causing configure not to find it. The outputs are:
$ /usr/bin/libpng-config --cflags --libs
-I/usr/include/libpng12
-lpng12
which worked just fine. In fact, I used report-emacs-bug in the newly
built emacs to send this message.
The rest of this message was produced by report-emacs-bug. I include it
in case there are details you can use.
Humbly submitted,
--jkl
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--- End Message ---
--- Begin Message ---
|
Subject: |
Re: 25.1; configure.ac libpng search error |
|
Date: |
Sat, 24 Dec 2016 17:08:10 -0800 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 |
I believe the fix is to change line 3413 of configure.ac to read:
png_libs=`(libpng-config --ldflags) 2>&AS_MESSAGE_LOG_FD` || {
Thanks, I did something along those lines by installing the attached patch into
master, and I'm boldly marking the bug report as done.
although IMO that's not quite sufficient, because it doesn't set RPATH.
--ldflags is supposed to output any -R options needed, no? If it's not, it
sounds like the libpng-config configuration is incorrect.
0001-Use-libpng-config-ldflags-not-libs.patch
Description: Text Data
--- End Message ---