Add config for gcc build directory

Author: antoyo

.gitignore

@@ -1,3 +1,4 @@
+gcc_path
 target
 **/*.rs.bk
 *.rlib

Readme.md

@@ -10,6 +10,8 @@ The following two patches need to be applied:**
  * https://gcc.gnu.org/pipermail/jit/2020q3/001228.html
  * https://gcc.gnu.org/pipermail/jit/2020q3/001247.html
 
+**Put the path to your custom build of libgccjit in the file `gcc_path`.**
+
 ```bash
 $ git clone https://github.com/antoyo/rustc_codegen_gcc.git
 $ cd rustc_codegen_gcc

config.sh

@@ -2,6 +2,8 @@ set -e
 
 export CARGO_INCREMENTAL=0
 
+export GCC_PATH=$(cat gcc_path)
+
 unamestr=`uname`
 if [[ "$unamestr" == 'Linux' ]]; then
    dylib_ext='so'
@@ -39,7 +41,7 @@ fi
 RUSTC="rustc $RUSTFLAGS -L crate=target/out --out-dir target/out"
 export RUSTC_LOG=warn # display metadata load errors
 
-export LD_LIBRARY_PATH="$(pwd)/target/out:$(pwd)/build_sysroot/sysroot/lib/rustlib/$TARGET_TRIPLE/lib:$(pwd)/../../../Projets/gcc-build/build/gcc/"
+export LD_LIBRARY_PATH="$(pwd)/target/out:$(pwd)/build_sysroot/sysroot/lib/rustlib/$TARGET_TRIPLE/lib:$GCC_PATH"
 export DYLD_LIBRARY_PATH=$LD_LIBRARY_PATH
 
 export CG_CLIF_DISPLAY_CG_TIME=1

gcc-test-backend/Cargo.lock

@@ -0,0 +1 @@
+/tmp/gcc-build/build/gcc

gcc_path

@@ -182,7 +182,7 @@ pub(crate) unsafe fn codegen(cgcx: &CodegenContext<GccCodegenBackend>, diag_hand
             }
 
             EmitObj::Bitcode => {
-                unimplemented!();
+                //unimplemented!();
                 /*debug!("copying bitcode {:?} to obj {:?}", bc_out, obj_out);
                 if let Err(e) = link_or_copy(&bc_out, &obj_out) {
                     diag_handler.err(&format!("failed to copy bitcode to object file: {}", e));

src/back/write.rs

@@ -3,7 +3,9 @@
 #set -x
 set -e
 
-export LD_LIBRARY_PATH="$(pwd)/../../../Projets/gcc-build/build/gcc/"
+export GCC_PATH=$(cat gcc_path)
+
+export LD_LIBRARY_PATH="$GCC_PATH"
 if [[ "$1" == "--release" ]]; then
     export CHANNEL='release'
     CARGO_INCREMENTAL=1 cargo rustc --release -- -Zrun_dsymutil=no

test.sh

@@ -8,11 +8,12 @@ use lang_tester::LangTester;
 use tempfile::TempDir;
 
 fn main() {
-    // TODO: load correct libgccjit.so file.
     let tempdir = TempDir::new().expect("temp dir");
     let current_dir = current_dir().expect("current dir");
     let current_dir = current_dir.to_str().expect("current dir").to_string();
-    env::set_var("LD_LIBRARY_PATH", format!("{}/../../../Projets/gcc-build/build/gcc/", current_dir));
+    let gcc_path = include_str!("../gcc_path");
+    let gcc_path = gcc_path.trim();
+    env::set_var("LD_LIBRARY_PATH", gcc_path);
     LangTester::new()
         .test_dir("tests/run")
         .test_file_filter(|path| path.extension().expect("extension").to_str().expect("to_str") == "rs")