scripts: Ignore compatibility constants in wrapper

When the working group changes the name of a constant:

  VK_KHR_MAINTENANCE1_SPEC_VERSION ->
  VK_KHR_MAINTENANCE_1_SPEC_VERSION

they will still #define the original name to maintain backward
compatibility with existing code that uses it:

  #define VK_KHR_MAINTENANCE_1_SPEC_VERSION 2
  #define VK_KHR_MAINTENANCE_1_EXTENSION_NAME "VK_KHR_maintenance1"
  #define VK_KHR_MAINTENANCE1_SPEC_VERSION  VK_KHR_MAINTENANCE_1_SPEC_VERSION
  #define VK_KHR_MAINTENANCE1_EXTENSION_NAME VK_KHR_MAINTENANCE_1_EXTENSION_NAME

In this case, we need to ignore the non-numeric _SPEC_VERSION and
unquoted _EXTENSION_NAME constants because they don't define a separate
extension.

1 files changed, 11 insertions, 6 deletions

diff --git a/scripts/generate_vulkan_wrapper.py b/scripts/generate_vulkan_wrapper.py
index 5abdc279..09be2ca4 100755
--- a/scripts/generate_vulkan_wrapper.py
+++ b/scripts/generate_vulkan_wrapper.py
@@ -1800,14 +1800,19 @@ def parse_subheader(filename, ext_guard):
                 current_ext.add_command(Command.from_c_typedef(line))
             elif line.startswith("#define") and "SPEC_VERSION " in line:
                 version_begin = line.rfind(" ") + 1
-                spec_version = int(line[version_begin:])
+                version_str = line[version_begin:]
+                # Non-numeric versions are used for backward compatibility and should be ignored
+                if version_str.isdigit():
+                    spec_version = int(version_str)
             elif line.startswith("#define") and "EXTENSION_NAME " in line:
                 name_end = line.rfind("\"")
-                name_begin = line.rfind("\"", 0, name_end) + 1
-                name = line[name_begin:name_end]
-                # add extension
-                current_ext = Extension(name, spec_version, ext_guard)
-                sub_extensions.append(current_ext)
+                name_begin = line.rfind("\"", 0, name_end)
+                # Unquoted names are used for backward compatibility and should be ignored
+                if name_begin != -1 and name_end != -1:
+                    name = line[name_begin + 1:name_end]
+                    # add extension
+                    current_ext = Extension(name, spec_version, ext_guard)
+                    sub_extensions.append(current_ext)
 
     return sub_extensions;