Big cmake changes (#1514)

* Delete emscripten.cmake

This file is not needed at this point. EMSDK provides a toolchain file that has a lot more things in it and is better supported. Project currently works fine with the documentation provided in Emscripten SDK on how to build projects.

* First pass file separation.

The main two files are cleaner now. Only important things can be seen. Major changes include:
- raylib_static is now the alias instead of raylib
- Repeating segments are removed and pulled into separate files into <root>/cmake
- File is reordered to make more sense
- Installs are better structured
- Library is build into an output directory "raylib" instead of "src"
- All public header files are now set as a public header file
- Source files need to be listed (it is a bad practice to capture them using wildcards and file globs)
- CMakeLists are better commented

* Second pass on the example dirs.

They are quite complex so I'm more hesitant to do major changes. Also it works pretty well. Noticed that I forgot one of the seperated files and added it into src/CMakeLists.txt.

* Returned the header copy as it was convenient to have the public headers copied.

* A better description to the variable RAYLIB_IS_MAIN

Co-authored-by: Rob Loach <[email protected]>

* Remove debug message

Co-authored-by: Rob Loach <[email protected]>

* Improvements based on review.

* Simplify the install condition to not be platform specific as it was before.

Co-authored-by: Alexander Neumann <[email protected]>

* Remove some CMAKE variables as they don't affect the build in any way

Co-authored-by: Alexander Neumann <[email protected]>

Co-authored-by: Rob Loach <[email protected]>
Co-authored-by: Alexander Neumann <[email protected]>

1 files changed, 33 insertions, 0 deletions

diff --git a/cmake/CompilerFlags.cmake b/cmake/CompilerFlags.cmake
new file mode 100644
index 00000000..41fee692
--- /dev/null
+++ b/cmake/CompilerFlags.cmake
@@ -0,0 +1,33 @@
+include(AddIfFlagCompiles)
+
+add_if_flag_compiles(-Werror=pointer-arith CMAKE_C_FLAGS)
+add_if_flag_compiles(-Werror=implicit-function-declaration CMAKE_C_FLAGS)
+# src/external/jar_xm.h does shady stuff
+add_if_flag_compiles(-fno-strict-aliasing CMAKE_C_FLAGS)
+
+if (ENABLE_ASAN)
+    add_if_flag_compiles(-fno-omit-frame-pointer CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+    add_if_flag_compiles(-fsanitize=address CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+endif()
+if (ENABLE_UBSAN)
+    add_if_flag_compiles(-fno-omit-frame-pointer CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+    add_if_flag_compiles(-fsanitize=undefined CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+endif()
+if (ENABLE_MSAN)
+    add_if_flag_compiles(-fno-omit-frame-pointer CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+    add_if_flag_compiles(-fsanitize=memory CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+endif()
+
+if (ENABLE_MSAN AND ENABLE_ASAN)
+    MESSAGE(WARNING "Compiling with both AddressSanitizer and MemorySanitizer is not recommended")
+endif()
+
+add_definitions("-DRAYLIB_CMAKE=1")
+
+if(CMAKE_VERSION VERSION_LESS "3.1")
+    if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
+        add_if_flag_compiles(-std=gnu99 CMAKE_C_FLAGS)
+    endif()
+else()
+    set (CMAKE_C_STANDARD 99)
+endif()