misc: Implemented an 'all' mode for the Meson build system

include/meson.build

@@ -34,9 +34,11 @@ target_paths = {
 	'stm32f1': 'stm32/f1'
 }
 
-target_path = target_paths[target_platform]
-subdir(f'libopencm3/@target_path@')
-
-target_vector_nvic = declare_dependency(
-	sources: target_nvic_header,
-)
+if target_platform != 'all'
+	target_path = target_paths[target_platform]
+	subdir(f'libopencm3/@target_path@')
+else
+	foreach target_name, target_path : target_paths
+		subdir(f'libopencm3/@target_path@')
+	endforeach
+endif

lib/meson.build

@@ -36,6 +36,6 @@ subdir('cm3')
 locm3_ld_script_path = meson.current_source_dir()
 
 # Now take the platform target and map it to a suitable target family
-if target_platform.startswith('stm32')
+if target_platform.startswith('stm32') or target_platform == 'all'
 	subdir('stm32')
 endif

lib/stm32/meson.build

@@ -52,4 +52,10 @@ subdirs = {
 }
 
 # Bring in the proper target subdir for the requested target platform
-subdir(subdirs[target_platform])
+if target_platform != 'all'
+	subdir(subdirs[target_platform])
+else
+	foreach subdir_name, subdir_path : subdirs
+		subdir(subdir_path)
+	endforeach
+endif

meson_options.txt

@@ -2,7 +2,9 @@ option(
 	'target',
 	type: 'combo',
 	choices: [
+		'all',
 		'stm32f1'
 	],
+	value: 'all',
 	description: 'The hardware platform you wish to target'
 )