MSVC builds fail with #pkgconfig: gcc-style -l/-L flags treated as inputs (e.g., -lintl → intl.obj)

[quaesitor-scientiam]

Describe the bug

When compiling with -cc msvc, V’s internal #pkgconfig emits gcc-style flags (-I/-L/-l). MSVC ignores -L and treats -lfoo as an input file,

Reproduction Steps

1. Ensure vcpkg libs (e.g., pango, freetype, glib) are installed.

2. Build a module that uses #pkgconfig (e.g., vglyph from vmodules).

3. Compile with MSVC:

   v -cc msvc -o clicks.exe C:\Users\john3.vmodules\gui\examples\clicks.v

Actual Result
MSVC warnings and link failure:

cl : warning D9002 : ignoring unknown option '-L...'
cl : warning D9024 : unrecognized source file type 'intl', object file assumed
LINK : fatal error LNK1104: cannot open file 'intl.obj'

Expected Behavior

MSVC build should succeed; pkgconfig-derived flags should be converted to MSVC-style /I, /LIBPATH:, and foo.lib.

Current Behavior

MSVC warnings and link failure:

cl : warning D9002 : ignoring unknown option '-L...'
cl : warning D9024 : unrecognized source file type 'intl', object file assumed
LINK : fatal error LNK1104: cannot open file 'intl.obj'

Possible Solution

When -cc msvc is selected, translate pkgconfig output flags before passing to the C compiler:

• -Ipath → /Ipath
• -Lpath → /LIBPATH:path
• -lfoo → foo.lib

This should be applied only for MSVC and not affect gcc/clang.

Additional Context
Attempting to override PKG_CONFIG is not effective because V uses its internal pkgconfig implementation for #pkgconfig, which always emits
gcc-style flags.

Additional Information/Context

No response

V version

V version: V 0.5.0 aca3797

Environment details (OS name and version, etc.)

|V full version      |V 0.5.0 c34ea2be9dba47a93aa206326aac3aa2b7365a77.aca3797
|:-------------------|:-------------------
|OS                  |windows, Microsoft Windows 11 Pro 26200 64-bit
|Processor           |24 cpus, 64bit, little endian, AMD Ryzen 9 5900X 12-Core Processor
|Memory              |82.77GB/127.92GB
|                    |
|V executable        |S:\repo\vlang\v.exe
|V last modified time|2026-02-19 14:28:41
|                    |
|V home dir          |OK, value: S:\repo\vlang
|VMODULES            |OK, value: C:\Users\john3\.vmodules
|VTMP                |OK, value: S:\temp\v_0
|Current working dir |OK, value: S:\repo\vlang
|                    |
|env VFLAGS          |"-cc clang"
|Git version         |git version 2.52.0.windows.1
|V git status        |weekly.2026.08-10-gaca3797f
|.git/config present |true
|                    |
|cc version          |cc (x86_64-posix-seh-rev0, Built by MinGW-Builds project) 15.2.0
|gcc version         |gcc (x86_64-posix-seh-rev0, Built by MinGW-Builds project) 15.2.0
|clang version       |clang version 21.1.7 (https://github.com/llvm/llvm-project.git 292dc2b86f66e39f4b85ec8b185fd8b60f5213ce)
|msvc version        |N/A
|tcc version         |tcc version 0.9.27 (x86_64 Windows)
|tcc git status      |thirdparty-windows-amd64 b425ac82
|emcc version        |N/A
|glibc version       |N/A

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[quaesitor-scientiam]

Causes this issue vlang/gui#46