qapi: Fix code generation for sub-modules in other directories

The #include directives to pull in sub-modules use file names relative
to the main module.  Works only when all modules are in the same
directory, or the main module's output directory is in the compiler's
include path.  Use relative file names instead.

The dummy variable we generate to avoid empty .o files has an invalid
name for sub-modules in other directories.  Fix that.

Both messed up in commit 252dc3105fc "qapi: Generate separate .h, .c
for each module".  Escaped testing because tests/qapi-schema-test.json
doesn't cover sub-modules in other directories, only
tests/qapi-schema/include-relpath.json does, and we generate and
compile C code only for the former, not the latter.  Fold the latter
into the former.  This would have caught the mistakes fixed in this
commit.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190301154051.23317-5-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 21 insertions, 12 deletions

diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 8512cac..f519483 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -2017,8 +2017,8 @@ def mcgen(code, **kwds):
     return cgen(code, **kwds)
 
 
-def guardname(filename):
-    return re.sub(r'[^A-Za-z0-9_]', '_', filename).upper()
+def c_fname(filename):
+    return re.sub(r'[^A-Za-z0-9_]', '_', filename)
 
 
 def guardstart(name):
@@ -2027,7 +2027,7 @@ def guardstart(name):
 #define %(name)s
 
 ''',
-                 name=guardname(name))
+                 name=c_fname(name).upper())
 
 
 def guardend(name):
@@ -2035,7 +2035,7 @@ def guardend(name):
 
 #endif /* %(name)s */
 ''',
-                 name=guardname(name))
+                 name=c_fname(name).upper())
 
 
 def gen_if(ifcond):
@@ -2281,9 +2281,9 @@ class QAPIGenC(QAPIGenCCode):
         return mcgen('''
 
 /* Dummy declaration to prevent empty .o file */
-char dummy_%(name)s;
+char qapi_dummy_%(name)s;
 ''',
-                     name=c_name(self.fname))
+                     name=c_fname(self.fname))
 
 
 class QAPIGenH(QAPIGenC):
@@ -2337,21 +2337,29 @@ class QAPISchemaModularCVisitor(QAPISchemaVisitor):
     def _is_builtin_module(name):
         return not name
 
+    def _module_dirname(self, what, name):
+        if self._is_user_module(name):
+            return os.path.dirname(name)
+        return ''
+
     def _module_basename(self, what, name):
         ret = '' if self._is_builtin_module(name) else self._prefix
         if self._is_user_module(name):
-            dirname, basename = os.path.split(name)
+            basename = os.path.basename(name)
             ret += what
             if name != self._main_module:
                 ret += '-' + os.path.splitext(basename)[0]
-            ret = os.path.join(dirname, ret)
         else:
             name = name[2:] if name else 'builtin'
             ret += re.sub(r'-', '-' + name + '-', what)
         return ret
 
+    def _module_filename(self, what, name):
+        return os.path.join(self._module_dirname(what, name),
+                            self._module_basename(what, name))
+
     def _add_module(self, name, blurb):
-        basename = self._module_basename(self._what, name)
+        basename = self._module_filename(self._what, name)
         genc = QAPIGenC(basename + '.c', blurb, self._pydoc)
         genh = QAPIGenH(basename + '.h', blurb, self._pydoc)
         self._module[name] = (genc, genh)
@@ -2393,8 +2401,9 @@ class QAPISchemaModularCVisitor(QAPISchemaVisitor):
             self._begin_user_module(name)
 
     def visit_include(self, name, info):
-        basename = self._module_basename(self._what, name)
+        relname = os.path.relpath(self._module_filename(self._what, name),
+                                  os.path.dirname(self._genh.fname))
         self._genh.preamble_add(mcgen('''
-#include "%(basename)s.h"
+#include "%(relname)s.h"
 ''',
-                                      basename=basename))
+                                      relname=relname))