CMake wx-config not present on mingw-cross.

[sinetek]

Hello again (#24451 ), I found a bug in the build system when cross compiling wx, it will not produce a wx-config like is expected.
I think we should always try to produce this file if on mingw, since mingw is a unix-like and everything fails to build without this file. On ./configure the wx-config is produced properly, which is what MSYS2 does.

Anyway, look at this:

build/cmake/functions.cmake

# Use the MSVC/makefile naming convention, or the configure naming convention,
# this is the same check as used in FindwxWidgets.
if(WIN32 AND NOT CYGWIN AND NOT MSYS)
    set(WIN32_MSVC_NAMING 1)
else()
    set(WIN32_MSVC_NAMING 0)
endif()

If we look at CMake.
CMake/Modules/FindwxWidgets.cmake

if(WIN32 AND NOT CYGWIN AND NOT MSYS AND NOT CMAKE_CROSSCOMPILING)
  set(wxWidgets_FIND_STYLE "win32")
else()
  set(wxWidgets_FIND_STYLE "unix")
endif()

Clearly these things are not the same, as claims the comment. The find package then fails because wx-config is not present, nor is the wx-config produced at build time.

[sinetek]

It's a bit more that just that. On the FindwxWidgets side, wx-config is picked up correctly, however the _LIBRARIES doesn't set because:

<some path>/cmake/modules/FindwxWidgets.cmake(191): wxWidgets not found due to following missing libraries: kernel32 user32 gdi32 comdlg32 winspool winmm shell32 shlwapi comctl32 ole32 oleaut32 uuid rpcrt4 advapi32 version ws2_32 wininet oleacc uxtheme

Unfortunately I don't know where to proceed from there.
EDIT: The answer is, adjust CMAKE_LIBRARY_PATH so that cmake finds these libraries.

[MaartenBent]

You could try find_package(wxWidgets CONFIG). Then it will use the cmake config files instead of FindwxWidgets.

However, I don't know if these are correct when cross-compiling.

[sinetek]

You could try find_package(wxWidgets CONFIG). Then it will use the cmake config files instead of FindwxWidgets.

However, I don't know if these are correct when cross-compiling.

thanks this works well as a solution!