Compile fails for Nuklear

[icexin]

$ cat nuklear.c
#define NK_IMPLEMENTATION
#define NK_INCLUDE_FIXED_TYPES
#define NK_INCLUDE_STANDARD_IO
#define NK_INCLUDE_DEFAULT_ALLOCATOR
#define NK_INCLUDE_FONT_BAKING
#define NK_INCLUDE_DEFAULT_FONT
#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT

#include "nuklear.h"

nuklear.h is from https://github.com/Immediate-Mode-UI/Nuklear/blob/master/nuklear.h

Output of cxgo file nuklear.c

Error: parsing failed: nuklear.h:428:1: front-end: undefined: size_t
nuklear.h:429:1: front-end: undefined: size_t
nuklear.h:430:1: front-end: undefined: size_t
nuklear.h:431:1: front-end: undefined: size_t
nuklear.h:432:1: front-end: undefined: size_t

[TotallyGamerJet]

I was actually just testing this. I got a similar error but at a different location in nuklear.h.

nuklear_context.c: parsing failed: .../Nuklear/src/nuklear.h:207:1: front-end: undefined: size_t
.../Nuklear/src/nuklear.h:208:1: front-end: undefined: size_t
.../Nuklear/src/nuklear.h:209:1: front-end: undefined: size_t
.../Nuklear/src/nuklear.h:210:1: front-end: undefined: size_t
.../Nuklear/src/nuklear.h:211:1: front-end: undefined: size_t

Strangely ,nuklear.h doesn't include stddef.h and it doesn't use size_t anywhere so I'm a little confused why it's erroring

[dennwc]

I think you could workaround it temporarily by using define section in cxgo config, see example.

[TotallyGamerJet]

Oh correction.nuklear.h does in fact include stdlib.h which include stddef.h

[icexin]

$ cat cxgo.yml
define:
  - name: size_t
    value: int

files:
  - name: nuklear.c

$ cxgo
2021/08/07 13:07:25 writing to /home/fanbingxin.linux/test/nk
2021/08/07 13:07:25 nuklear.c
Error: nuklear.c: parsing failed: nuklear.h:428:1: front-end: undefined: size_t
nuklear.h:429:1: front-end: undefined: size_t
nuklear.h:430:1: front-end: undefined: size_t
nuklear.h:431:1: front-end: undefined: size_t
nuklear.h:432:1: front-end: undefined: size_t

Still the same error.

[dennwc]

Shortest reproducer:

int a = sizeof(int);

And the error:

sizeof_only.c:2:9: front-end: undefined: size_t

Which definitely comes from cc, so I opened an issue.

For now the workaround is to remove define from the config and add typedef int size_t; before #include "nuklear.h".

Nuklear still doesn't compile, but with a different error, which deserves a separate issue.

[dennwc]

Additional #define is required to make Nuklear compile at least partially:

#define NK_INCLUDE_STANDARD_BOOL

Another failure on NK_ALIGNOF is related to #31, but can be worked around by defining _MSC_VER.

Next, it makes sense to map Nuklear's stbtt_(u)intN types to cxgo fixed int types:

define:
  - name: stbtt_uint8
    value: _cxgo_uint8
  - name: stbtt_int8
    value: _cxgo_sint8
  - name: stbtt_uint16
    value: _cxgo_uint16
  - name: stbtt_int16
    value: _cxgo_sint16
  - name: stbtt_uint32
    value: _cxgo_uint32
  - name: stbtt_int32
    value: _cxgo_sint32

There was a bug with missing fmod function, now fixed by 18fb1b5c975c8890cba921ffac06dc86540f5c42.

Next error is related to NK_OFFSETOF used in NK_CONTAINER_OF and also caused by #31. Temporary workaround is to replace definitions in nuklear.h with:

#define NK_OFFSETOF(st,m) offsetof(st,m)
#define NK_CONTAINER_OF(ptr,type,member)\
    (type*)((void*)((char*)(1 ? (ptr): &((type*)1)->member) - NK_OFFSETOF(type, member)))

This finally allows cxgo to convert the code, but it then fails on gofmt due to a collision between type names and function names which is #32. It can be fixed by renaming these functions:

files:
  - name: nuklear.c
    replace:
      - old: 'nk_vec2('
        new: 'nk_vec2f('
      - old: 'nk_vec2i('
        new: 'nk_vec2if('
      - old: 'nk_rect('
        new: 'nk_rectf('
      - old: 'nk_recti('
        new: 'nk_rectif('
      - old: 'nk_font_baker('
        new: 'nk_font_bakerf('
      - old: 'nk_font_config('
        new: 'nk_font_configf('

At the end there are a few more issues that you'd have to fix on a case-by-case basis (either manually or with replace).

I will come back to this later to file issues on Github and eventually fix them.

So the config I have at the moment is:

package: gonuke
int_size: 8
ptr_size: 8
define:
  - name: _MSC_VER
  - name: stbtt_uint8
    value: _cxgo_uint8
  - name: stbtt_int8
    value: _cxgo_sint8
  - name: stbtt_uint16
    value: _cxgo_uint16
  - name: stbtt_int16
    value: _cxgo_sint16
  - name: stbtt_uint32
    value: _cxgo_uint32
  - name: stbtt_int32
    value: _cxgo_sint32
files:
  - name: nuklear.c
    replace:
      - old: 'nk_vec2('
        new: 'nk_vec2f('
      - old: 'nk_vec2i('
        new: 'nk_vec2if('
      - old: 'nk_rect('
        new: 'nk_rectf('
      - old: 'nk_recti('
        new: 'nk_rectif('
      - old: 'nk_font_baker('
        new: 'nk_font_bakerf('
      - old: 'nk_font_config('
        new: 'nk_font_configf('