meson: add support for llvm-style code coverage

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

.gitignore

@@ -72,6 +72,7 @@ doxygen/
 *.orig
 /tests/log
 /tests/testcases/__pycache__/
+*.profraw
 
 # Subproject files
 subprojects/libconfig

meson.build

@@ -36,6 +36,15 @@ if get_option('sanitize')
 	endif
 endif
 
+if get_option('llvm_coverage')
+	if cc.get_id() != 'clang'
+		error('option \'llvm_coverage\' requires clang')
+	endif
+	coverage_flags = ['-fprofile-instr-generate', '-fcoverage-mapping']
+	add_global_arguments(coverage_flags, language: 'c')
+	add_global_link_arguments(coverage_flags, language: 'c')
+endif
+
 if get_option('modularize')
 	if not cc.has_argument('-fmodules')
 		error('option \'modularize\' requires clang')

meson_options.txt

@@ -12,6 +12,9 @@ option('compton', type: 'boolean', value: true, description: 'Install backwards
 
 option('with_docs', type: 'boolean', value: false, description: 'Build documentation and man pages')
 
-option('modularize', type: 'boolean', value: false, description: 'Build with clang\'s module system')
-
 option('unittest', type: 'boolean', value: false, description: 'Enable unittests in the code')
+
+# Experimental options
+
+option('modularize', type: 'boolean', value: false, description: 'Build with clang\'s module system (experimental)')
+option('llvm_coverage', type: 'boolean', value: false, description: 'Use LLVM source-based code coverage, instead of --coverage. Do not use with b_coverage.')