C Compiler Error in Build of GUI

[mike-ward]

Describe the bug

Building the buttons.v program described below causes a C compiler build error.

Reproduction Steps

• Clone https://github.com/mike-ward/gui/tree/c-bug
• cd into examples folder
• v -path "/Users/mike/gui/src|@vlib|@vmodules" run button.v

(substitute the /Users/mike/gui/src with cloned source

Expected Behavior

Builds the program successfully

Current Behavior

================== C compilation error (from cc): ==============
cc:       |                                ^
cc: /tmp/v_501/buttons.01JSJ00CX3TQS83956TAQPH7WW.tmp.c:7177:51: error: indirection requires pointer operand ('gui__Container' (aka 'struct gui__Container') invalid)
cc:  7177 |         return I_gui__Container_to_Interface_gui__View(&(*(_V_closure_ctx->view)));
cc:       |                                                          ^~~~~~~~~~~~~~~~~~~~~~~
cc: /tmp/v_501/buttons.01JSJ00CX3TQS83956TAQPH7WW.tmp.c:14085:103: warning: implicit conversion from enumeration type 'sokol__gfx__LoadAction' to different enumeration type 'sg_load_action' (aka 'enum sg_load_action') [-Wenum-conversion]
cc:  14085 |         sokol__gfx__ColorAttachmentAction color_action = ((sokol__gfx__ColorAttachmentAction){.load_action = sokol__gfx__LoadAction__clear,.store_action = 0,.clear_value = ((sokol__gfx__Color){.r = r,.g = g,.b = b,.a = a,}),});
cc:        |                                                                                              ~               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc: /tmp/v_501/buttons.01JSJ00CX3TQS83956TAQPH7WW.tmp.c:14511:32: warning: implicit conversion from enumeration type 'sokol__gfx__PixelFormat' to different enumeration type 'sg_pixel_format' (aka 'enum sg_pixel_format') [-Wenum-conversion]
cc:  14511 |         env.defaults.color_format = (*(sokol__gfx__PixelFormat*)_t1.data);
cc:        |                                   ~  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc: /tmp/v_501/buttons.01JSJ00CX3TQS83956TAQPH7WW.tmp.c:14518:32: warning: implicit conversion from enumeration type 'sokol__gfx__PixelFormat' to different enumeration type 'sg_pixel_format' (aka 'enum sg_pixel_format') [-Wenum-conversion]
cc:  14518 |         env.defaults.depth_format = (*(sokol__gfx__PixelFormat*)_t2.data);
...

Possible Solution

The problem function is on line 138 of buttons.v (fn msg_box). Commenting out the call to w.message_box allows for a successful build.

Additional Information/Context

Tried working around this by passing Window reference in MessageBoxCfg. Same error.

V version

V 0.4.10 a0a8324

Environment details (OS name and version, etc.)

V full version	V 0.4.10 da3112e.a0a8324
OS	macos, macOS, 15.3.2, 24D81
Processor	8 cpus, 64bit, little endian, Apple M2
Memory	0.15GB/8GB
V executable	/Users/mike/Documents/github/v/v
V last modified time	2025-04-21 20:29:18
V home dir	OK, value: /Users/mike/Documents/github/v
VMODULES	OK, value: /Users/mike/.vmodules
VTMP	OK, value: /tmp/v_501
Current working dir	OK, value: /Users/mike/Documents/github/gui/src/examples
env VFLAGS	"-path /Users/mike/Documents/github/gui/src
Git version	git version 2.49.0
V git status	weekly.2025.14-79-ga0a83248 (4 commit(s) behind V master)
.git/config present	true
cc version	Apple clang version 17.0.0 (clang-1700.0.13.3)
gcc version	Apple clang version 17.0.0 (clang-1700.0.13.3)
clang version	Apple clang version 17.0.0 (clang-1700.0.13.3)
tcc version	tcc version 0.9.28rc 2024-02-05 HEAD@105d70f7 (AArch64 Darwin)
tcc git status	thirdparty-macos-arm64 c8df4e27
emcc version	N/A
glibc version	N/A

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[huly-for-github]

Connected to Huly®: V_0.6-22683