compilation

cmake flags

-L: list all variable
-H: help
-A: all (that a lot normaly not needed)
-D<var>=<value>: Sets a CMake variable to the specified value.
-G<generatorName>: Specifies the build system generator to use.
-C<pathToCacheFile>: Preloads the CMake cache with values from the given file.

-DLLVM_ENABLE_PROJECT=<project1>;<project2>
-DLLVM_TARGESTS_TO_BUILD=<Target1>;<Target2>
-DCMAKE_BUILD_TYPE= # Debug or Release
 
-DLLVM_OPTIMIZED_TABLEGEN=1
-DBUILD_SHARED_LIBS=1
-DBUILD_SHARED_LIBS=1
-DLLVM_ENABLE_ASSERTIONS=1
 
-GNinja

ninja

ninja             # Build all
ninja <target>    # Build specific target
ninja clean       # Clean build
ninja check       # Run tests
ninja intrinsics_gen #gen the TableGen file

Useful Flags

-j <n>            # Parallel jobs (use for -j1 with -v to see what happen)
-v                # Verbose output
-d explain        # Debug why a rule runs
-t targets all    # List targets
-t compdb cxx     # Export compile_commands.json