fix(tests): remove the __extension__ keyword in filter_complex_blocks (#32483)

Problem: This keyword is used by GCC and Clang to prevent -Wpedantic
(and other options) from emitting warnings for many GNU C extensions.
This is used heavily in Alpine Linux through musl libc and
foritfy-headers. Without filtering the __extension__ keyword some type
definitions are duplicated. For example, timeval is defined once as

  struct timeval { time_t tv_sec; suseconds_t tv_usec; };

and once as:

  __extension__ struct timeval { time_t tv_sec; suseconds_t tv_usec; };

Without this patch, the LuaJIT C parser doesn't recognize that these
definitions are equivalent, causing unit test to fail on Alpine Linux.

Solution: Filter out the keyword in filter_complex_blocks.

1 files changed, 3 insertions, 0 deletions

diff --git a/test/unit/testutil.lua b/test/unit/testutil.lua
index 4720d4d730..7fe27ad735 100644
--- a/test/unit/testutil.lua
+++ b/test/unit/testutil.lua
@@ -151,6 +151,9 @@ local function filter_complex_blocks(body)
         or string.find(line, 'mach_vm_range_recipe')
       )
     then
+      -- Remove GCC's extension keyword which is just used to disable warnings.
+      line = string.gsub(line, '__extension__', '')
+
       -- HACK: remove bitfields from specific structs as luajit can't seem to handle them.
       if line:find('struct VTermState') then
         line = string.gsub(line, 'state : 8;', 'state;')