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Upgrade libpng to 1.6.34

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Upgrade src/png submodule to the latest library version and slightly
update its upgrade instructions.
This commit is contained in:
Vadim Zeitlin
2017-11-11 14:04:51 +01:00
parent a8e7d0ee12
commit 617250bc11
2 changed files with 7 additions and 6 deletions
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11
docs/contributing/how-to-update-third-party-library.md
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@@ -116,11 +116,12 @@ to perform an extra step after merging the new version (and before committing
your changes):
Create a temporary build directory and run libpng configure from it using
--with-libpng-prefix=wx_ option. Then run "make" (actually just "make png.lo"
is sufficient as we don't really need to build the library) to create
pnglibconf.h and pngprefix.h files in the build directory. And copy these
files to src/png subdirectory of the wxWidgets source tree, overwriting the
versions there.
--with-libpng-prefix=wx_ option. Then run `make pnglibconf.h pngprefix.h`
to create these files in the build directory. Next, search for the line
containing `PNG_ZLIB_VERNUM` in the `pnglibconf.h` and set it to 0 to disable
zlib version checks (this looks dangerous but seems to be unavoidable with the
current build system). And then, finally, copy these files to src/png
subdirectory of the wxWidgets source tree, overwriting the 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