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Link precompiled hosts on Linux

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This commit is contained in:
Richard Feldman 2020-09-30 21:42:18 -04:00
parent 4ec16749a0
commit 9741784604
3 changed files with 29 additions and 58 deletions
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68
cli/src/lib.rs
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@ -180,52 +180,42 @@ fn build_file(
let cwd = dest_filename.parent().unwrap();
// Step 2: have rustc compile the host
let host_output_path = cwd.join("libhost.a"); // TODO should be host.lib on Windows
Command::new("rustc")
.args(&[
"-L",
".",
"--crate-type",
"staticlib",
"host.rs",
"-o",
host_output_path.as_path().to_str().unwrap(),
// ensure we don't make a position-independent executable
"-C",
"link-arg=-no-pie",
// explicitly link in the c++ stdlib, for exceptions
"-C",
"link-arg=-lc++",
])
.current_dir(cwd)
.spawn()
.map_err(|_| {
todo!("gracefully handle `rustc` failing to spawn.");
})?
.wait()
.map_err(|_| {
todo!("gracefully handle error after `rustc` spawned");
})?;
// Step 3: link the compiled host and compiled app
let binary_path = cwd.join("app"); // TODO should be app.exe on Windows
// Step 2: link the precompiled host and compiled app
let arch = "x86_64"; // TODO determine this based on target
let target_triple = "x86_64-unknown-linux-gnu";
let host_input_path = cwd
.join("platform")
.join("host")
.join(target_triple)
.join("host.o");
let binary_path = cwd.join("app"); // TODO should be app.exe on Windows
// TODO do we need -lSystem on macOS? -lpthread? -lm? -lresolv? -lc++?
// TODO try to move as much of this linking as possible to the precompiled
// host, to minimize the amount of host-application linking required.
Command::new("ld") // TODO use lld
.args(&[
"-L",
".",
"-arch",
arch,
"-lc", // libc
"-lhost", // libhost.a
"-e",
"_main", // assume hosts use `main` as their entry points
"/usr/lib/x86_64-linux-gnu/crti.o",
"/usr/lib/x86_64-linux-gnu/crtn.o",
"/usr/lib/x86_64-linux-gnu/Scrt1.o",
"-dynamic-linker",
"/lib64/ld-linux-x86-64.so.2",
// Libraries - see https://github.com/rtfeldman/roc/pull/554#discussion_r496365925
// for discussion and further references
"-lc",
"-lm",
"-lpthread",
"-ldl",
"-lrt",
"-lutil",
"-lc_nonshared",
// "-lc++", // TODO shouldn't we need this?
// "-lgcc", // TODO will eventually need compiler_rt from gcc or something - see https://github.com/rtfeldman/roc/pull/554#discussion_r496370840
// "-lunwind", // TODO will eventually need this, see https://github.com/rtfeldman/roc/pull/554#discussion_r496370840
"-o",
binary_path.as_path().to_str().unwrap(),
binary_path.as_path().to_str().unwrap(), // app
host_input_path.as_path().to_str().unwrap(), // host.o
dest_filename.as_path().to_str().unwrap(), // roc_app.o
])
.current_dir(cwd)