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Add libpng upgrade example for MSW.

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Catalin 2017-01-06 18:16:00 +02:00
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docs/contributing/how-to-update-third-party-library.md
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@ -125,3 +125,22 @@ versions there.
Notice that config.h generated by libpng configure is not used, we build it
without -DHAVE_CONFIG_H as it works just fine without it on any ANSI C system
(i.e. anywhere by now).
Example updating libpng files under MSW:
Since configure looked for zlib, the following 2 steps were also needed:
a) get zlib source code (www.zlib.net) to a separate location;
b) in zlib root dir run: mingw32-make -fwin32/Makefile.gcc
(will generate zlib1.dll)
1) get libpng source code (libpng.sourceforge.net) to a separate location;
2) in libpng root dir run:
configure --with-libpng-prefix=wx_
Alternatively, if configure still cannot find zlib, run:
export CPPFLAGS="-I zlib-root-dir"
export LDFLAGS="-L zlib-root-dir"
configure --with-libpng-prefix=wx_
3) in libpng root dir run:
mingw32-make png.lo
(will generate pnglibconf.h and pngprefix.h, among others)
4) copy files from libpng root dir and scripts subfolder to src/png, updating old files only (other new files were not needed);
5) commit the changes.