Print user defined options in meson-log.txt

It can be useful to know what options have been passed to the command
line, excluding default values.

Closes: #5956

mesonbuild/coredata.py

@@ -31,6 +31,7 @@ from typing import (
 )
 import typing
 import enum
+import shlex
 
 if typing.TYPE_CHECKING:
     from . import dependencies
@@ -776,6 +777,9 @@ def get_cmd_line_file(build_dir):
 
 def read_cmd_line_file(build_dir, options):
     filename = get_cmd_line_file(build_dir)
+    if not os.path.isfile(filename):
+        return
+
     config = CmdLineFileParser()
     config.read(filename)
 
@@ -816,6 +820,16 @@ def update_cmd_line_file(build_dir, options):
     with open(filename, 'w') as f:
         config.write(f)
 
+def get_cmd_line_options(build_dir, options):
+    copy = argparse.Namespace(**vars(options))
+    read_cmd_line_file(build_dir, copy)
+    cmdline = ['-D{}={}'.format(k, v) for k, v in copy.cmd_line_options.items()]
+    if options.cross_file:
+        cmdline += ['--cross-file {}'.format(f) for f in options.cross_file]
+    if options.native_file:
+        cmdline += ['--native-file {}'.format(f) for f in options.native_file]
+    return ' '.join([shlex.quote(x) for x in cmdline])
+
 def major_versions_differ(v1, v2):
     return v1.split('.')[0:2] != v2.split('.')[0:2]
 

mesonbuild/msetup.py

@@ -161,6 +161,7 @@ class MesonApp:
     def _generate(self, env):
         mlog.debug('Build started at', datetime.datetime.now().isoformat())
         mlog.debug('Main binary:', sys.executable)
+        mlog.debug('Build Options:', coredata.get_cmd_line_options(self.build_dir, self.options))
         mlog.debug('Python system:', platform.system())
         mlog.log(mlog.bold('The Meson build system'))
         mlog.log('Version:', coredata.version)