Linker errors on Windows msvc

[fowlmouth]

I get errors at the linking stage about the stb_image functions

[Linking]
Microsoft (R) C/C++ Optimizing Compiler Version 18.00.31101 for x86
Copyright (C) Microsoft Corporation.  All rights reserved.

Microsoft (R) Incremental Linker Version 12.00.31101.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/debug
/stack:33554432
/out:c:\users\phowl_000\src\nimx\test\main.exe
c:\users\phowl_000\src\nimx\test\nimcache\nimx_linkage_details.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_sdl_window.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_table_view.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_scroll_view.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_render_to_image.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_unistring.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_text_field.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_view_event_handling.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_window_event_handling.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_app.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_window.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_event.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_control.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_button.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_animation.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_write_image_impl.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_load_image_impl.obj
c:\users\phowl_000\src\nimx\test\nimcache\sdl2_sdl2.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_resource.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_image.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_portable_gl.obj
c:\users\phowl_000\src\nimx\test\nimcache\ttf_ttf.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_rect_packer.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_hashes.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_tables.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_unicode.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_font.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_math.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_matrixes.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_logging.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_unsigned.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_dynlib.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_times.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_parseutils.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_strutils.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_os.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_winlean.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_sequtils.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_macros.obj
c:\users\phowl_000\src\nimx\test\nimcache\opengl_opengl.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_context.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_types.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_typetraits.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_view.obj
c:\users\phowl_000\src\nimx\test\nimcache\stdlib_system.obj
c:\users\phowl_000\src\nimx\test\nimcache\nimx_main.obj
nimx_image.obj : error LNK2019: unresolved external symbol @stbi_load@20 referen
ced in function @imagewithcontentsoffile_769309@4
nimx_image.obj : error LNK2019: unresolved external symbol @stbi_image_free@4 re
ferenced in function @imagewithcontentsoffile_769309@4
nimx_image.obj : error LNK2019: unresolved external symbol @stbi_load_from_memor
y@24 referenced in function @imagewithresource_769326@8
nimx_image.obj : error LNK2019: unresolved external symbol @stbi_write_tga@20 re
ferenced in function @writetofile_770036@12
nimx_image.obj : error LNK2019: unresolved external symbol @stbi_write_hdr@20 re
ferenced in function @writetofile_770036@12
nimx_image.obj : error LNK2019: unresolved external symbol @stbi_write_bmp@20 re
ferenced in function @writetofile_770036@12
nimx_image.obj : error LNK2019: unresolved external symbol @stbi_write_png@24 re
ferenced in function @writetofile_770036@12
nimx_font.obj : error LNK2019: unresolved external symbol @stbtt_FindGlyphIndex@
8 referenced in function @bakechars_748115@8
nimx_font.obj : error LNK2019: unresolved external symbol @stbtt_GetGlyphBitmapB
ox@32 referenced in function @bakechars_748115@8
nimx_font.obj : error LNK2019: unresolved external symbol @stbtt_MakeGlyphBitmap
@32 referenced in function @bakechars_748115@8
c:\users\phowl_000\src\nimx\test\main.exe : fatal error LNK1120: 10 unresolved e
xternals
Error: execution of an external program failed

I tried making a .def file and compiling with nim c --passL:"/DEF:win.def" --parallelBuild:1 main that was all I could think of doing

[yglukhov]

This seems a lot like mangling problem. These are all the FFI functions. Unfortunately I don't have windows machine to play with it. Could you please provide the generated nimcache\ttf_ttf.c and nimcache\nimx_font.c?

[fowlmouth]

@yglukhov https://gist.github.com/fowlmouth/98f4ca4ed2204593f035

[yglukhov]

So indeed this looks like a mangling problem because of fastcall convention, that nim generates. Could I ask you to try and mark some C function (e.g. stbi_load in load_image_impl.nim) as N_RAW_NIMCALL? And test whether it helps the linker find it?

STBIDEF stbi_uc * N_RAW_NIMCALL stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
{
...

[fowlmouth]

Thanks @yglukhov that fixed the linker error for the first one I tried :) will close after I've fixed them all