Build Error when using Coroutines - photonwrapper.so empty

[rrpolanco]

Describe the bug

When building with -use-coroutinesflag on MacOS, I get the following error:

================== C compilation error (from cc): ==============
cc: ld: file is empty in '/Users/rhad/Documents/src/v/thirdparty/photon/photonwrapper.so'
cc: clang: error: linker command failed with exit code 1 (use -v to see invocation)
================================================================
(You can pass `-cg`, or `-show-c-output` as well, to print all the C error messages).
builder error: 
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .

photonwrapper.so actually exist but its 0B (empty) which tells me it was not actually downloaded.
Probing further, the issue is that the curl command used to download the shared object does not follow 302 location header: https://github.com/vlang/v/blob/master/vlib/v/pref/pref.v#L993

Reproduction Steps

Build with -use-coroutines on MacOS

Expected Behavior

Successful build with -use-coroutines flag.

Current Behavior

================== C compilation error (from cc): ==============
cc: ld: file is empty in '/Users/rhad/Documents/src/v/thirdparty/photon/photonwrapper.so'
cc: clang: error: linker command failed with exit code 1 (use -v to see invocation)
================================================================
(You can pass `-cg`, or `-show-c-output` as well, to print all the C error messages).
builder error: 
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .

Possible Solution

1. Add -L to cURL command here: https://github.com/vlang/v/blob/master/vlib/v/pref/pref.v#L993
2. Add CI to build with -use-coroutines to catch these types of errors.

Additional Information/Context

No response

V version

V 0.4.12 82d4ba6

Environment details (OS name and version, etc.)

V full version	V 0.4.12 82d4ba6
OS	macos, macOS, 15.7.1, 24G231
Processor	11 cpus, 64bit, little endian, Apple M3 Pro
Memory	0.51GB/18GB
V executable	/Users/rhad/Documents/src/v/v
V last modified time	2025-11-06 04:18:28
V home dir	OK, value: /Users/rhad/Documents/src/v
VMODULES	OK, value: /Users/rhad/.vmodules
VTMP	OK, value: /tmp/v_501
Current working dir	OK, value: /Users/rhad/Documents/src/retry-v
Git version	git version 2.44.0
V git status	82d4ba6
.git/config present	true
cc version	Apple clang version 17.0.0 (clang-1700.3.19.1)
gcc version	Apple clang version 17.0.0 (clang-1700.3.19.1)
clang version	Apple clang version 17.0.0 (clang-1700.3.19.1)
tcc version	tcc version 0.9.28rc 2024-02-05 HEAD@105d70f7 (AArch64 Darwin)
tcc git status	thirdparty-macos-arm64 1867108f
emcc version	N/A
glibc version	N/A

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[jorgeluismireles]

There is a note here: https://github.com/vlang/v/blob/master/examples/coroutines/coroutines_bench.v saying is not trivial to do CI test for coroutines.

Seems the direct URI is https://github.com/vlang/photonbin/blob/master/photonwrapper_macos_amd64.so instead https://github.com/vlang/photonbin/raw/master/photonwrapper_${os.user_os()}_${arch}.so

Did you already manually put the .so in your thirdparty folder and test the examples?