[cmake] update cmake for PLATFORM_MEMORY

[CrackedPixel]

taken from #5731

also tagging cmake maintainers ray mentioned: @Peter0x44 @manuel5975p @JohnnyCena123 (victorHM doesnt appear for me)

How to test:

mkdir build
cd build
cmake .. -DPLATFORM=Memory
make

how to test cross compile (windows for linux users):

mkdir build
cd build
cmake .. -DPLATFORM=Memory -DCMAKE_C_COMPILER=x86_64-w64-mingw32-gcc
make

[Peter0x44]

It looks reasonable to me. How do I test it?

[Peter0x44]

raylib_opengl_interop.c fails to build with errors like:

C:/programming/homedir/raylib/examples/others/raylib_opengl_interop.c: In function 'main':
C:/programming/homedir/raylib/examples/others/raylib_opengl_interop.c:100:5: error: unknown type name 'GLuint'
  100 |     GLuint vao = 0;
      |     ^~~~~~
C:/programming/homedir/raylib/examples/others/raylib_opengl_interop.c:101:5: error: unknown type name 'GLuint'
  101 |     GLuint vbo = 0;
      |     ^~~~~~
C:/programming/homedir/raylib/examples/others/raylib_opengl_interop.c:102:5: error: implicit declaration of function 'glGenVertexArrays' [-Wimplicit-function-declaration]
  102 |     glGenVertexArrays(1, &vao);
      |     ^~~~~~~~~~~~~~~~~
C:/programming/homedir/raylib/examples/others/raylib_opengl_interop.c:103:5: error: implicit declaration of function 'glBindVertexArray'; did you mean 'rlLoadVertexArray'? [-Wimplicit-function-declaration]
  103 |     glBindVertexArray(vao);
      |     ^~~~~~~~~~~~~~~~~
      |     rlLoadVertexArray

it should probably be skipped?

Every example also fails to link with a missing symbol from winmm

C:\WINDOWS\system32\cmd.exe /C "cd . && C:\programming\toolchains\w64devkit\bin\cc.exe -std=c11 -fno-strict-aliasing -Werror=implicit-function-declaration -Werror=pointer-arith  examples/CMakeFiles/core_clipboard_text.dir/core/core_clipboard_text.c.obj -o examples\core_clipboard_text.exe -Wl,--out-implib,examples\libcore_clipboard_text.dll.a -Wl,--major-image-version,0,--minor-image-version,0  raylib/libraylib.a  -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ."
C:/programming/toolchains/w64devkit/bin/ld.exe: raylib/libraylib.a(rcore.c.obj):rcore.c:(.text+0x40b0e): undefined reference to `__imp_timeBeginPeriod'
collect2.exe: error: ld returned 1 exit status

[CrackedPixel]

raylib_opengl_interop.c fails to build with errors like:

C:/programming/homedir/raylib/examples/others/raylib_opengl_interop.c: In function 'main':
C:/programming/homedir/raylib/examples/others/raylib_opengl_interop.c:100:5: error: unknown type name 'GLuint'
  100 |     GLuint vao = 0;
      |     ^~~~~~
C:/programming/homedir/raylib/examples/others/raylib_opengl_interop.c:101:5: error: unknown type name 'GLuint'
  101 |     GLuint vbo = 0;
      |     ^~~~~~
C:/programming/homedir/raylib/examples/others/raylib_opengl_interop.c:102:5: error: implicit declaration of function 'glGenVertexArrays' [-Wimplicit-function-declaration]
  102 |     glGenVertexArrays(1, &vao);
      |     ^~~~~~~~~~~~~~~~~
C:/programming/homedir/raylib/examples/others/raylib_opengl_interop.c:103:5: error: implicit declaration of function 'glBindVertexArray'; did you mean 'rlLoadVertexArray'? [-Wimplicit-function-declaration]
  103 |     glBindVertexArray(vao);
      |     ^~~~~~~~~~~~~~~~~
      |     rlLoadVertexArray

it should probably be skipped?

Every example also fails to link with a missing symbol from winmm

C:\WINDOWS\system32\cmd.exe /C "cd . && C:\programming\toolchains\w64devkit\bin\cc.exe -std=c11 -fno-strict-aliasing -Werror=implicit-function-declaration -Werror=pointer-arith  examples/CMakeFiles/core_clipboard_text.dir/core/core_clipboard_text.c.obj -o examples\core_clipboard_text.exe -Wl,--out-implib,examples\libcore_clipboard_text.dll.a -Wl,--major-image-version,0,--minor-image-version,0  raylib/libraylib.a  -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ."
C:/programming/toolchains/w64devkit/bin/ld.exe: raylib/libraylib.a(rcore.c.obj):rcore.c:(.text+0x40b0e): undefined reference to `__imp_timeBeginPeriod'
collect2.exe: error: ld returned 1 exit status

1. updated OP with testing instructions
2. removed opengl example for memory platform
3. fixed missing -lwinmm

[Peter0x44]

Hmm. the desktop platform should need the winmm link too. I wonder where it comes from there.

I don't have the time to look now, just acknowledging I saw the push.

[raysan5]

@CrackedPixel I'm merging the changes. I'm a bit concerned about WinMM library because it is a raylib requirement on Win32 platform, afaik also GLFW requires it to be explicitly added...

About raylib_opengl_interop, that example should be moved from examples but not sure where to place it, maybe raylib-extras? others folder will be removed at some moment...