Help with compiling my app

[crimson hinge]

Hi, i'm new to Rust and yesterday I made an app with gtk and I can compile it for my system. I'm running Manjaro Linux ( I did cargo build --release). Now I wanted to release it for Windows and macOs. For windows building i tried cargo build --release --target=x86_64-pc-windows-msvc but it fails (i'll give the console output in the file under this message). I maybe misunderstood something as I'm really new to this language (and btw i'm French so sorry for my grammatical errors). Anyone could help me to solve my problem please?

Here is my Cargo.toml if needed:

[package]
name = "SkymBootstrap"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
gtk = { version = "0.6.6", package = "gtk4"}
glib = "0.17.10"
tokio = { version = "1.29.1", features = ["full"] }
reqwest = "0.11.18"
flate2 = "1.0.26"
tar = "0.4.38"
zip = "0.6.6"
dirs = "5.0.1"
md5 = "0.7.0"
serde_json = "1.0.100"

[dusty cedar]

  Install a sysroot for the target platform and configure it via
  PKG_CONFIG_SYSROOT_DIR and PKG_CONFIG_PATH, or install a
  cross-compiling wrapper for pkg-config and set it via
  PKG_CONFIG environment variable.```
says right here at the bottom of that log

[crimson hinge]

Thanks, so here is what I did:

export PKG_CONFIG_SYSROOT_DIR=/usr
export PKG_CONFIG_PATH=/usr/lib/pkgconfig:/usr/share/pkgconfig

But now I get a new error:

error: linking with `x86_64-w64-mingw32-gcc` failed: exit status: 1

with a lot of files not found, so I maybe miss something. I'm search since a few hours on the internet about it but for now I can't figure out how to fix it
Note: I tried to compile with cargo build --target=x86_64-pc-windows-gnu --release

[spare hound]

For MacOs, you pretty much have to build on MacOs. There are (unsupported) workarounds, but basically you have to build for Mac/IOS on Mac.
See also: https://github.com/rust-lang/rust/issues/112501 and https://github.com/tpoechtrager/osxcross#how-does-it-work

For cross compiling to windows-msvc, you will need to install the Visual C/C++ Build Tools edit: Runtime, I suggest using xwinto install the required things https://github.com/Jake-Shadle/xwin .

For cross compiling when using additional libraries (on any non-host target basically), you will to have the versions of those libraries for the target where the cross-linker expects them to be (It looks like for x86_64-w64-mingw32-gcc, that's /usr/x86_64-w64-mingw32/lib, at least on my machine)

[vast tinsel]

pretty much what zachs said, the missing libs in the error message can be found here https://packages.msys2.org/package/?repo=mingw64, you need to install them

if you still have the issue after installing them, you can try to feed the paths for each of them by adding a file in .cargo/config.toml inside your project

something like this :

[target.x86_64-pc-windows-msvc]
rustflags = [
  "-Lnative=/mingw64/bin/",
  "-Lnative=/where/mingw64/is/installed/bin",
] ```