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Fix cross-compiling servoshell on Mac hosts (#32504)

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`#[cfg(target_os = "xxx")]` when used in build scripts checks which
platform the **build script** is compiled for - i.e. the Host OS.
Since ware interested in the actual target os, we need to read
`CARGO_CFG_TARGET_OS`, a value that is set at **runtime of the build
script**.

Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>
This commit is contained in:
Jonathan Schwender 2024-06-15 00:38:53 +02:00 • committed by GitHub
parent 3370146490
commit 19067366df
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GPG key ID: B5690EEEBB952194
2 changed files with 19 additions and 15 deletions
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4
ports/servoshell/Cargo.toml
View file

@ -20,13 +20,11 @@ bench = false
[build-dependencies]
vergen = { version = "8.3.1", features = ["git", "git2"] }
cc = "1.0"
[target.'cfg(windows)'.build-dependencies]
winres = "0.1"
[target.'cfg(target_os = "macos")'.build-dependencies]
cc = "1.0"
[package.metadata.winres]
FileDescription = "Servo"
LegalCopyright = "© The Servo Project Developers"

14
ports/servoshell/build.rs
View file

@ -21,6 +21,11 @@ fn main() -> Result<(), Box<dyn Error>> {
println!("cargo:rustc-cfg=servo_do_not_use_in_production");
}
// Note: We can't use `#[cfg(windows)]`, since that would check the host platform
// and not the target platform
let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();
if target_os == "windows" {
#[cfg(windows)]
{
let mut res = winres::WindowsResource::new();
@ -28,8 +33,9 @@ fn main() -> Result<(), Box<dyn Error>> {
res.set_manifest_file("platform/windows/servo.exe.manifest");
res.compile().unwrap();
}
#[cfg(target_os = "macos")]
{
#[cfg(not(windows))]
panic!("Cross-compiling to windows is currently not supported");
} else if target_os == "macos" {
cc::Build::new()
.file("platform/macos/count_threads.c")
.compile("count_threads");
@ -50,8 +56,8 @@ fn main() -> Result<(), Box<dyn Error>> {
// On MacOS, all dylib dependencies are shipped along with the binary
// in the "/lib" directory. Setting the rpath here, allows the dynamic
// linker to locate them. See `man dyld` for more info.
#[cfg(target_os = "macos")]
if target_os == "macos" {
println!("cargo:rustc-link-arg=-Wl,-rpath,@executable_path/lib/");
}
Ok(())
}