cake does not exit with non-zero return code when failing

[madebr]

Trying to transpile SDL3 sources with:

$ /home/maarten/projects/cake/src/cake -DDLL_EXPORT -DSDL_BUILD_MAJOR_VERSION=3 -DSDL_BUILD_MICRO_VERSION=3 -DSDL_BUILD_MINOR_VERSION=3 -DUSING_GENERATED_CONFIG_H -I/home/maarten/projects/SDL/cmake-build-debug-cake/include-config-relwithdebinfo/build_config -I/home/maarten/projects/SDL/cmake-build-debug-cake/include-revision -I/home/maarten/projects/SDL/include -I/home/maarten/projects/SDL/src -I/home/maarten/projects/SDL/cmake-build-debug-cake/wayland-generated-protocols -I/usr/include/pipewire-0.3 -I/usr/include/spa-0.2 -I/usr/include/fribidi -I/usr/include/libdrm -I/usr/include/libdecor-0 -I/usr/lib64/pkgconfig/../../include/dbus-1.0 -I/usr/lib64/pkgconfig/../../lib64/dbus-1.0/include -I/usr/include/ibus-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/sysprof-6 -I/usr/include/libusb-1.0 -DNDEBUG -D_REENTRANT -I/usr/lib/gcc/x86_64-redhat-linux/15/include -I/usr/local/include -I/usr/include -target=x86_x64_gcc -I/home/maarten/projects/SDL/src /home/maarten/projects/SDL/src/SDL.c -o /tmp/SDL.cake.c

fails with

Cake 0.12.61 (x86_x64_gcc)
/home/maarten/programming/SDL/src/SDL.c
int-ll64.h:20:9: error 860: invalid type
 20 |typedef __signed__ char __s8;
    |        ~~~~~~~~~~            
int-ll64.h:20:9: error 1270: storage size of '__signed__' isn't known
 20 |typedef __signed__ char __s8;
    |        ~~~~~~~~~~            
int-ll64.h:20:20: error 970: expected token ';', got 'char' 
 20 |typedef __signed__ char __s8;
    |                   ~~~~       

3 errors 0 warnings 0 notes 
1 files in 0.74 seconds

But the result code is 0, signifying success:

$ echo $?
0

(My cake-wrapper.py currently fails because of this)