pngcrush library mismatch

[Peter Miller]

When pngcrush is used in the

  pngcrush infile.png outfile.png

form, the following error occurs:

  pngcrush: relocation error: pngcrush: symbol png_read_data, version PNG12_0 not defined in file libpng12.so.0 with link time reference

strangely, this doesn't occur for usage messages.

Ubuntu version: Dapper

dpkg reports...
ii libpng12-0 1.2.8rel-5 PNG library - runtime
ii pngcrush 1.5.10-2 optimizes PNG (Portable Network Graphics) files

[Peter Miller (pmiller-opensource)]

The /usr/lib/libpng.a file contains the definition of the png_read_data symbol, but the /usr/lib/libpng.so file has no mention of it.

The command

  apt-get --compile source pngcrush

fails with numerous undefined png_* symbols.

[Peter Miller (pmiller-opensource)]

This patch at least gets pngcrush to build, but highlights the disparity between the .a and .so form of libpng

--- Makefile-orig 2006-04-04 21:55:36.000000000 +1000
+++ Makefile 2006-04-04 21:56:30.000000000 +1000
@@ -6,7 +6,7 @@
 all: pngcrush

 pngcrush: pngcrush.o
- $(CC) -o pngcrush -lpng -lz pngcrush.o
+ $(CC) -static pngcrush.o -o pngcrush -lpng -lz -lm

 install:

[Peter Miller (pmiller-opensource)]

Rebuilding libpng using

  apt-get --compile source libpng

buils the same defective .so file.

[Daniel Richard G. (skunk)]

png_read_data() is a libpng 1.0.x function; that library was dropped after the Breezy release. Debian has a newer version of pngcrush (1.6.2) that uses libpng 1.2.x, and otherwise works fine on Ubuntu.

[LaserJock (laserjock)]

pngcrush 1.6.2-1 has been synced into Dapper from Debian unstable. This version fixed this bug for me. Please reopen this bug if 1.6.2-1 still gives the error.