Generator rules can have more than one output.

backends.py

@@ -20,6 +20,7 @@ import environment
 from meson_install import InstallData
 from interpreter import InvalidArguments
 import shutil
+from coredata import MesonException
 
 if environment.is_windows():
     quote_char = '"'
@@ -525,22 +526,29 @@ class NinjaBackend(Backend):
             exe = generator.get_exe()
             infilelist = genlist.get_infilelist()
             outfilelist = genlist.get_outfilelist()
-            if len(infilelist) != len(outfilelist):
-                raise RuntimeError('Internal data structures broken.')
             if isinstance(exe, interpreter.BuildTarget):
                 exe_file = os.path.join(self.environment.get_build_dir(), self.get_target_filename(exe))
             else:
                 exe_file = exe.get_command()
             base_args = generator.get_arglist()
             for i in range(len(infilelist)):
-                infilename = os.path.join(self.environment.get_source_dir(), infilelist[i])
-                outfilename = os.path.join(self.get_target_private_dir(target), outfilelist[i])
-                args = [x.replace("@INPUT@", infilename).replace('@OUTPUT@', outfilename)\
+                if len(infilelist) == len(outfilelist):
+                    sole_output = os.path.join(self.get_target_private_dir(target), outfilelist[i])
+                else:
+                    for x in base_args:
+                        if '@OUTPUT@' in x:
+                            raise MesonException('Tried to use @OUTPUT@ in a rule with more than one output.')
+                    sole_output = ''
+                curfile = infilelist[i]
+                infilename = os.path.join(self.environment.get_source_dir(), curfile)
+                outfiles = genlist.get_outputs_for(curfile)
+                outfiles = [os.path.join(self.get_target_private_dir(target), of) for of in outfiles]
+                args = [x.replace("@INPUT@", infilename).replace('@OUTPUT@', sole_output)\
                         for x in base_args]
                 args = [x.replace("@SOURCE_DIR@", self.environment.get_source_dir()).replace("@BUILD_DIR@", self.get_target_private_dir(target))
                         for x in args]
                 cmdlist = [exe_file] + args
-                elem = NinjaBuildElement(outfilename, 'CUSTOM_COMMAND', infilename)
+                elem = NinjaBuildElement(outfiles, 'CUSTOM_COMMAND', infilename)
                 elem.add_item('DESC', 'Generating $out')
                 if isinstance(exe, interpreter.BuildTarget):
                     elem.add_dep(self.get_target_filename(exe))

environment.py

@@ -147,13 +147,12 @@ int main(int argc, char **argv) {
         os.close(fd)
         ofile = open(srcname, 'w')
         code = templ % (prefix, element)
-        print(code)
         ofile.write(code)
         ofile.close()
         commands = self.get_exelist()
         commands.append(srcname)
         commands += self.get_output_flags(exename)
-        p = subprocess.Popen(commands, cwd=os.path.split(srcname)[0])#s, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+        p = subprocess.Popen(commands, cwd=os.path.split(srcname)[0], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
         p.communicate()
         os.remove(srcname)
         if p.returncode != 0:

interpreter.py

@@ -148,21 +148,24 @@ class Generator(InterpreterObject):
                 raise InvalidArguments('A non-string object in "arguments" keyword argument.')
         self.arglist = args
         
-        if 'output_name' not in kwargs:
-            raise InvalidArguments('Generator must have "output_name" keyword argument.')
-        rule = kwargs['output_name']
-        if not isinstance(rule, str):
-            raise InvalidArguments('"output_name" keyword argument must be a string.')
-        if not '@BASENAME@' in rule and not '@PLAINNAME@' in rule:
-            raise InvalidArguments('"output_name" must contain @BASENAME@ or @PLAINNAME@.')
-        if '/' in rule:
-            raise InvalidArguments('"output_name" must not contain a slash.')
-        self.name_rule = rule
-
-    def get_base_outname(self, inname):
+        if 'outputs' not in kwargs:
+            raise InvalidArguments('Generator must have "outputs" keyword argument.')
+        outputs = kwargs['outputs']
+        if not isinstance(outputs, list):
+            outputs = [outputs]
+        for rule in outputs:
+            if not isinstance(rule, str):
+                raise InvalidArguments('"outputs" may only contain strings.')
+            if not '@BASENAME@' in rule and not '@PLAINNAME@' in rule:
+                raise InvalidArguments('"outputs" must contain @BASENAME@ or @PLAINNAME@.')
+            if '/' in rule or '\\' in rule:
+                raise InvalidArguments('"outputs" must not contain a directory separator.')
+        self.outputs = outputs
+
+    def get_base_outnames(self, inname):
         plainname = os.path.split(inname)[1]
         basename = plainname.split('.')[0]
-        return self.name_rule.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname)
+        return [x.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname) for x in self.outputs]
 
     def process_method(self, args, kwargs):
         if len(kwargs) > 0:
@@ -187,10 +190,13 @@ class GeneratedList(InterpreterObject):
         self.generator = generator
         self.infilelist = []
         self.outfilelist = []
+        self.outmap = {}
 
     def add_file(self, newfile):
         self.infilelist.append(newfile)
-        self.outfilelist.append(self.generator.get_base_outname(newfile))
+        outfiles = self.generator.get_base_outnames(newfile)
+        self.outfilelist += outfiles
+        self.outmap[newfile] = outfiles
 
     def get_infilelist(self):
         return self.infilelist
@@ -198,6 +204,9 @@ class GeneratedList(InterpreterObject):
     def get_outfilelist(self):
         return self.outfilelist
 
+    def get_outputs_for(self, filename):
+        return self.outmap[filename]
+
     def get_generator(self):
         return self.generator
 

test cases/common/29 pipeline/meson.build

@@ -3,7 +3,7 @@ project('pipeline test', 'c')
 e1 = executable('srcgen', 'srcgen.c')
 
 gen = generator(e1, \
- output_name  : '@BASENAME@.c', # Line continuation inside arguments should work without needing a "\".
+ outputs  : '@BASENAME@.c', # Line continuation inside arguments should work without needing a "\".
  arguments : ['@INPUT@', '@OUTPUT@'])
 
 generated = gen.process('input_src.dat')

test cases/common/30 pipeline/meson.build

@@ -2,8 +2,8 @@ project('pipeline test', 'c')
 
 e1 = executable('srcgen', 'srcgen.c')
 
-gen = generator(e1, \
- output_name  : '@BASENAME@.h', \
+gen = generator(e1,
+ outputs  : '@BASENAME@.h',
  arguments : ['@INPUT@', '@OUTPUT@'])
 
 generated = gen.process('input_src.dat')

test cases/common/31 find program/meson.build

@@ -11,7 +11,7 @@ if host.name() == 'windows'
 else
   cp = find_program('cp', required : true)
   gen = generator(cp, \
-   output_name  : '@BASENAME@.c', \
+   outputs  : '@BASENAME@.c', \
    arguments : ['@INPUT@', '@OUTPUT@'])
 
   generated = gen.process('source.in')

test cases/frameworks/5 protocol buffers/meson.build

@@ -4,7 +4,7 @@ protoc = find_program('protoc', required : true)
 dep = find_dep('protobuf', required : true)
 
 gen = generator(protoc, \
-  output_name  : '@BASENAME@.pb.cc',
+  outputs  : ['@BASENAME@.pb.cc', '@BASENAME@.pb.h'],
   arguments : ['-I=@SOURCE_DIR@', '--cpp_out=@BUILD_DIR@', '@INPUT@'])
 
 generated = gen.process('defs.proto')