build/meson: add option to regenrate sources

Author: mochaaP

meson.build

@@ -123,9 +123,11 @@ if get_option('debug')
   )
 endif
 
-copy = find_program('cp', 'xcopy')
+copy = find_program('cp', 'xcopy', required: true)
+fs = import('fs')
 
 qjs_parser = get_option('parser')
+qjs_codegen = get_option('codegen').enable_auto_if(fs.is_dir('unicode/'))
 
 qjs_c_args = ['-D_GNU_SOURCE']
 
@@ -146,38 +148,44 @@ unicode_gen = executable(
   build_by_default: false,
 )
 
-unicode_table = custom_target(
-  'codegen_libunicode-table.h',
-  command: [
-    unicode_gen,
-    '@CURRENT_SOURCE_DIR@/unicode',
-    '@OUTPUT@',
-  ],
-  depend_files: files(
-    'unicode/CaseFolding.txt',
-    'unicode/CompositionExclusions.txt',
-    'unicode/DerivedCoreProperties.txt',
-    'unicode/DerivedNormalizationProps.txt',
-    'unicode/emoji-data.txt',
-    'unicode/NormalizationTest.txt',
-    'unicode/PropertyValueAliases.txt',
-    'unicode/PropList.txt',
-    'unicode/ScriptExtensions.txt',
-    'unicode/Scripts.txt',
-    'unicode/SpecialCasing.txt',
-    'unicode/UnicodeData.txt',
-  ),
-  output: 'codegen_libunicode-table.h',
-)
+if qjs_codegen.enabled()
+  unicode_table_gen = custom_target(
+    'codegen_libunicode-table.h',
+    command: [
+      unicode_gen,
+      '@CURRENT_SOURCE_DIR@/unicode',
+      '@OUTPUT@',
+    ],
+    depend_files: files(
+      'unicode/CaseFolding.txt',
+      'unicode/CompositionExclusions.txt',
+      'unicode/DerivedCoreProperties.txt',
+      'unicode/DerivedNormalizationProps.txt',
+      'unicode/emoji-data.txt',
+      'unicode/NormalizationTest.txt',
+      'unicode/PropertyValueAliases.txt',
+      'unicode/PropList.txt',
+      'unicode/ScriptExtensions.txt',
+      'unicode/Scripts.txt',
+      'unicode/SpecialCasing.txt',
+      'unicode/UnicodeData.txt',
+    ),
+    output: 'codegen_libunicode-table.h',
+  )
 
-run_target(
-  'libunicode-table.h',
-  command: [
-    copy,
-    unicode_table,
-    files('libunicode-table.h'),
-  ],
-)
+  run_target(
+    'libunicode-table.h',
+    command: [
+      copy,
+      unicode_table_gen,
+      files('libunicode-table.h'),
+    ],
+  )
+
+  unicode_table = unicode_table_gen
+else
+  unicode_table = files('libunicode-table.h')
+endif
 
 qjs_sys_deps = []
 
@@ -375,6 +383,7 @@ gen_repl_src = custom_target(
   ],
   input: files('repl.js'),
   output: 'repl.c',
+  build_by_default: false,
 )
 gen_standalone_src = custom_target(
   'gen_standalone.c',
@@ -388,6 +397,7 @@ gen_standalone_src = custom_target(
   ],
   input: files('standalone.js'),
   output: 'standalone.c',
+  build_by_default: false,
 )
 gen_function_source_src = custom_target(
   'gen_function_source.c',
@@ -400,6 +410,7 @@ gen_function_source_src = custom_target(
   ],
   input: files('tests/function_source.js'),
   output: 'function_source.c',
+  build_by_default: false,
 )
 gen_hello_src = custom_target(
   'gen_hello.c',
@@ -412,6 +423,7 @@ gen_hello_src = custom_target(
   ],
   input: files('examples/hello.js'),
   output: 'hello.c',
+  build_by_default: false,
 )
 gen_hello_module_src = custom_target(
   'gen_hello_module.c',
@@ -425,6 +437,7 @@ gen_hello_module_src = custom_target(
   ],
   input: files('examples/hello_module.js'),
   output: 'hello_module.c',
+  build_by_default: false,
 )
 gen_test_fib_src = custom_target(
   'gen_test_fib.c',
@@ -438,6 +451,7 @@ gen_test_fib_src = custom_target(
   ],
   input: files('examples/test_fib.js'),
   output: 'test_fib.c',
+  build_by_default: false,
 )
 alias_target('codegen',
   run_target(
@@ -500,6 +514,21 @@ alias_target('codegen',
     ],
   ),
 )
+if qjs_codegen.enabled()
+  repl_src = gen_repl_src
+  standalone_src = gen_standalone_src
+  function_source_src = gen_function_source_src
+  hello_src = gen_hello_src
+  hello_module_src = gen_hello_module_src
+  test_fib_src = gen_test_fib_src
+else
+  repl_src = files('gen/repl.c')
+  standalone_src = files('gen/standalone.c')
+  function_source_src = files('gen/function_source.c')
+  hello_src = files('gen/hello.c')
+  hello_module_src = files('gen/hello_module.c')
+  test_fib_src = files('gen/test_fib.c')
+endif
 
 mimalloc_dep = []
 mimalloc_sys_dep = dependency('mimalloc', required: get_option('cli_mimalloc'))
@@ -514,8 +543,8 @@ endif
 qjs_exe_srcs = files(
   'qjs.c',
 ) + [
-  gen_repl_src,
-  gen_standalone_src
+  repl_src,
+  standalone_src
 ]
 qjs_exe = executable(
   'qjs',
@@ -685,7 +714,7 @@ if tests.allowed()
     'function_source',
     executable(
       'function_source',
-      gen_function_source_src,
+      function_source_src,
       qjs_libc_srcs,
 
       c_args: qjs_c_args,
@@ -715,7 +744,7 @@ endif
 if examples.allowed()
   executable(
     'hello',
-    gen_hello_src,
+    hello_src,
     qjs_libc_srcs,
 
     c_args: qjs_c_args,
@@ -724,7 +753,7 @@ if examples.allowed()
 
   executable(
     'hello_module',
-    gen_hello_module_src,
+    hello_module_src,
     qjs_libc_srcs,
 
     c_args: qjs_c_args,
@@ -736,7 +765,7 @@ if examples.allowed()
   executable(
     'test_fib',
     'examples/fib.c',
-    gen_test_fib_src,
+    test_fib_src,
     qjs_libc_srcs,
 
     c_args: qjs_c_args,

meson_options.txt

@@ -3,4 +3,5 @@ option('examples', type: 'feature', description: 'build examples')
 option('libc', type: 'boolean', value: false, description: 'build qjs standard library modules as part of the library')
 option('cli_mimalloc', type: 'feature', value: 'disabled', description: 'build qjs cli with mimalloc')
 option('docdir', type: 'string', description: 'documentation directory')
-option('parser', type: 'boolean', value: true, description: 'Enable JS source code parser')
+option('parser', type: 'boolean', value: true, description: 'enable JS source code parser')
+option('codegen', type: 'feature', value: 'disabled', description: 'use regenerated source code')