This fixes a ton of instances of the following warning, introduced in
cmake-3.14.0:
CMake Warning (dev) at cmake/libs/CheckGettext.cmake:30 (SET):
implicitly converting 'msgfmt executable.' to 'STRING' type.
Call Stack (most recent call first):
src/libi18n/CMakeLists.txt:9 (CHECK_GETTEXT)
This warning is for project developers. Use -Wno-dev to suppress it.
I'll eventually make them delayload so they won't be loaded unless they're
actually needed.
Rearranged the build directory layout such that all binaries are located
in the top-level bin/ directory. This is needed in order for the test
suites to work, since they might depend on zlib and/or libpng.
NOTE: We have to use CACHE INTERNAL; otherwise, the KDE5 build ignores
the directory options. (Maybe this is why the KDE4 build always used
this directory layout in the first place?)
NOTE 2: On Windows, DLLs are copied to ${CMAKE_RUNTIME_OUTPUT_DIRECTORY},
whereas on Linux, SOs are copied to ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}.
Test images are now copied using a custom command, since the output
directory isn't easily determined at generate time. (It could be
the same as ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}, but msbuild uses
configuration-specific subdirectories.
TODO: Keep test images in a subdirectory. This will need adjustments in
the test suites to look in img/ first, then the current directory.
I've decided to get rid of the GDI+ PNG handling. It doesn't improve
anything performance-wise, adds coding overhead, and probably isn't
any faster than libpng.
GDI+ also doesn't support APNG. This version does.
NOTE: If I add APNG export, I'll need to use the included libpng
in Ubuntu builds, since Ubuntu still has libpng-1.2, and it's a
version that doesn't support APNG.
Reworked the bundled library system to be similar to the one in
mcrecover, but improved.
Added "-fpic -fPIC" to all extlib static libraries when building
for Linux systems. This is needed for libpng, but might not be
needed for other libraries; nevertheless, it should be set.
TODO: Use libpng in the Windows build. It's being linked in,
but it isn't actually being used for anything yet.
