Auto merge of rust-lang#127566 - GuillaumeGomez:sync-cg_gcc, r=GuillaumeGomez

Sync rustc_codegen_gcc

Follow-up of rust-lang/rustc_codegen_gcc#535.

cc `@antoyo`

Author: bors

Diff for: compiler/rustc_codegen_gcc/.github/workflows/ci.yml

@@ -49,11 +49,11 @@ jobs:
       # `llvm-14-tools` is needed to install the `FileCheck` binary which is used for asm tests.
       run: sudo apt-get install ninja-build ripgrep llvm-14-tools
 
-    - name: Install rustfmt
-      run: rustup component add rustfmt
+    - name: Install rustfmt & clippy
+      run: rustup component add rustfmt clippy
 
     - name: Download artifact
-      run: curl -LO https://github.com/antoyo/gcc/releases/latest/download/${{ matrix.libgccjit_version.gcc }}
+      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/${{ matrix.libgccjit_version.gcc }}
 
     - name: Setup path to libgccjit
       run: |
@@ -78,9 +78,16 @@ jobs:
     - name: Build
       run: |
         ./y.sh prepare --only-libcore
-        ./y.sh build
+        ./y.sh build --sysroot
         cargo test
-        ./y.sh clean all
+
+    - name: Run y.sh cargo build
+      run: |
+        ./y.sh cargo build --manifest-path tests/hello-world/Cargo.toml
+
+    - name: Clean
+      run: |
+        ./y.sh clean all      
 
     - name: Prepare dependencies
       run: |
@@ -96,7 +103,12 @@ jobs:
         ./y.sh test --release --clean --build-sysroot ${{ matrix.commands }}
 
     - name: Check formatting
-      run: cargo fmt -- --check
+      run: ./y.sh fmt --check
+
+    - name: clippy
+      run: |
+        cargo clippy --all-targets -- -D warnings
+        cargo clippy --all-targets --features master -- -D warnings
 
   duplicates:
     runs-on: ubuntu-latest

Diff for: compiler/rustc_codegen_gcc/.github/workflows/failures.yml

@@ -56,7 +56,7 @@ jobs:
 
     - name: Download artifact
       if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
-      run: curl -LO https://github.com/antoyo/gcc/releases/latest/download/gcc-13.deb
+      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/gcc-13.deb
 
     - name: Setup path to libgccjit
       if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
@@ -94,7 +94,20 @@ jobs:
       run: cat tests/failing-non-lto-tests.txt >> tests/failing-ui-tests.txt
 
     - name: Run tests
+      # TODO: re-enable those tests for libgccjit 12.
+      if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
       id: tests
       run: |
         ${{ matrix.libgccjit_version.env_extra }} ./y.sh test --release --clean --build-sysroot --test-failing-rustc ${{ matrix.libgccjit_version.extra }} | tee output_log
         rg --text "test result" output_log >> $GITHUB_STEP_SUMMARY
+
+    - name: Run failing ui pattern tests for ICE
+      # TODO: re-enable those tests for libgccjit 12.
+      if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
+      id: ui-tests
+      run: |
+        ${{ matrix.libgccjit_version.env_extra }} ./y.sh test --release --test-failing-ui-pattern-tests ${{ matrix.libgccjit_version.extra }} | tee output_log_ui
+        if grep -q "the compiler unexpectedly panicked" output_log_ui; then
+          echo "Error: 'the compiler unexpectedly panicked' found in output logs. CI Error!!"
+          exit 1
+        fi

Diff for: compiler/rustc_codegen_gcc/.github/workflows/gcc12.yml

@@ -68,21 +68,23 @@ jobs:
       run: |
         ./y.sh prepare --only-libcore --libgccjit12-patches
         ./y.sh build --no-default-features --sysroot-panic-abort
-        cargo test --no-default-features
-        ./y.sh clean all
-
-    - name: Prepare dependencies
-      run: |
-        git config --global user.email "[email protected]"
-        git config --global user.name "User"
-        ./y.sh prepare --libgccjit12-patches
-
-    - name: Add more failing tests for GCC 12
-      run: cat tests/failing-ui-tests12.txt >> tests/failing-ui-tests.txt
-
-    - name: Add more failing tests because the sysroot is not compiled with LTO
-      run: cat tests/failing-non-lto-tests.txt >> tests/failing-ui-tests.txt
-
-    - name: Run tests
-      run: |
-        ./y.sh test --release --clean --build-sysroot ${{ matrix.commands }} --no-default-features
+        # Uncomment when we no longer need to remove global variables.
+        #./y.sh build --sysroot --no-default-features --sysroot-panic-abort
+        #cargo test --no-default-features
+        #./y.sh clean all
+
+    #- name: Prepare dependencies
+      #run: |
+        #git config --global user.email "[email protected]"
+        #git config --global user.name "User"
+        #./y.sh prepare --libgccjit12-patches
+
+    #- name: Add more failing tests for GCC 12
+      #run: cat tests/failing-ui-tests12.txt >> tests/failing-ui-tests.txt
+
+    #- name: Add more failing tests because the sysroot is not compiled with LTO
+      #run: cat tests/failing-non-lto-tests.txt >> tests/failing-ui-tests.txt
+
+    #- name: Run tests
+      #run: |
+        #./y.sh test --release --clean --build-sysroot ${{ matrix.commands }} --no-default-features

Diff for: compiler/rustc_codegen_gcc/.github/workflows/m68k.yml

@@ -54,13 +54,7 @@ jobs:
       run: curl -LO https://github.com/cross-cg-gcc-tools/cross-gcc/releases/latest/download/gcc-m68k-13.deb
 
     - name: Download VM artifact
-      uses: dawidd6/action-download-artifact@v2
-      with:
-          workflow: m68k.yml
-          name: debian-m68k
-          repo: cross-cg-gcc-tools/vms
-          branch: master
-          event: push
+      run: curl -LO https://github.com/cross-cg-gcc-tools/vms/releases/latest/download/debian-m68k.img
 
     - name: Setup path to libgccjit
       run: |
@@ -88,10 +82,17 @@ jobs:
         sudo mount debian-m68k.img vm
         sudo cp $(which qemu-m68k-static) vm/usr/bin/
 
+    - name: Build sample project with target defined as JSON spec
+      run: |
+        ./y.sh prepare --only-libcore --cross
+        ./y.sh build --sysroot --target-triple m68k-unknown-linux-gnu --target ${{ github.workspace }}/target_specs/m68k-unknown-linux-gnu.json
+        ./y.sh cargo build --manifest-path=./tests/hello-world/Cargo.toml --target ${{ github.workspace }}/target_specs/m68k-unknown-linux-gnu.json
+        ./y.sh clean all
+
     - name: Build
       run: |
         ./y.sh prepare --only-libcore --cross
-        ./y.sh build --target-triple m68k-unknown-linux-gnu
+        ./y.sh build --sysroot --target-triple m68k-unknown-linux-gnu
         CG_GCC_TEST_TARGET=m68k-unknown-linux-gnu cargo test
         ./y.sh clean all
 

Diff for: compiler/rustc_codegen_gcc/.github/workflows/release.yml

@@ -37,7 +37,7 @@ jobs:
       run: sudo apt-get install ninja-build ripgrep
 
     - name: Download artifact
-      run: curl -LO https://github.com/antoyo/gcc/releases/latest/download/gcc-13.deb
+      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/gcc-13.deb
 
     - name: Setup path to libgccjit
       run: |
@@ -53,7 +53,7 @@ jobs:
     - name: Build
       run: |
         ./y.sh prepare --only-libcore
-        EMBED_LTO_BITCODE=1 ./y.sh build --release --release-sysroot
+        EMBED_LTO_BITCODE=1 ./y.sh build --sysroot --release --release-sysroot
         cargo test
         ./y.sh clean all
 
@@ -62,12 +62,12 @@ jobs:
         git config --global user.email "[email protected]"
         git config --global user.name "User"
         ./y.sh prepare
-        # FIXME(antoyo): we cannot enable LTO for stdarch tests currently because of some failing LTO tests using proc-macros.
-        echo -n 'lto = "fat"' >> build_sysroot/Cargo.toml
 
     - name: Add more failing tests because of undefined symbol errors (FIXME)
       run: cat tests/failing-lto-tests.txt >> tests/failing-ui-tests.txt
 
     - name: Run tests
       run: |
+        # FIXME(antoyo): we cannot enable LTO for stdarch tests currently because of some failing LTO tests using proc-macros.
+        echo -n 'lto = "fat"' >> build_system/build_sysroot/Cargo.toml
         EMBED_LTO_BITCODE=1 ./y.sh test --release --clean --release-sysroot --build-sysroot ${{ matrix.commands }}

Diff for: compiler/rustc_codegen_gcc/.github/workflows/stdarch.yml

@@ -58,7 +58,7 @@ jobs:
     - name: Build
       run: |
         ./y.sh prepare --only-libcore
-        ./y.sh build --release --release-sysroot
+        ./y.sh build --sysroot --release --release-sysroot
 
     - name: Set env (part 2)
       run: |
@@ -89,12 +89,11 @@ jobs:
     - name: Run stdarch tests
       if: ${{ !matrix.cargo_runner }}
       run: |
-        cd build_sysroot/sysroot_src/library/stdarch/
-        CHANNEL=release TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ../../../../y.sh cargo test
+        CHANNEL=release TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ./y.sh cargo test --manifest-path build/build_sysroot/sysroot_src/library/stdarch/Cargo.toml
 
     - name: Run stdarch tests
       if: ${{ matrix.cargo_runner }}
       run: |
-        cd build_sysroot/sysroot_src/library/stdarch/
         # FIXME: these tests fail when the sysroot is compiled with LTO because of a missing symbol in proc-macro.
-        STDARCH_TEST_EVERYTHING=1 CHANNEL=release CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER="${{ matrix.cargo_runner }}" TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ../../../../y.sh cargo test -- --skip rtm --skip tbm --skip sse4a
+        # TODO: remove --skip test_mm512_stream_ps when stdarch is updated in rustc.
+        STDARCH_TEST_EVERYTHING=1 CHANNEL=release CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER="${{ matrix.cargo_runner }}" TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ./y.sh cargo test --manifest-path build/build_sysroot/sysroot_src/library/stdarch/Cargo.toml -- --skip rtm --skip tbm --skip sse4a --skip test_mm512_stream_ps

Diff for: compiler/rustc_codegen_gcc/.gitignore

@@ -6,10 +6,6 @@ perf.data
 perf.data.old
 *.events
 *.string*
-/build_sysroot/sysroot
-/build_sysroot/sysroot_src
-/build_sysroot/Cargo.lock
-/build_sysroot/test_target/Cargo.lock
 gimple*
 *asm
 res

Diff for: compiler/rustc_codegen_gcc/Cargo.lock

@@ -79,18 +79,18 @@ dependencies = [
 
 [[package]]
 name = "gccjit"
-version = "2.0.0"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecaa4c3da2d74c1a991b4faff75d49ab1d0522d9a99d8e2614b3b04d226417ce"
+checksum = "62e0ba949ebee07c5cc21f02cb48f28f2c8db7fcbc15fdc5120476a6c43b4636"
 dependencies = [
  "gccjit_sys",
 ]
 
 [[package]]
 name = "gccjit_sys"
-version = "0.1.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "406a66fba005f1a02661f2f9443e5693dd3a667b7c58e70aa4ccc4c8b50b4758"
+checksum = "a5bbf85e12c2593772329a9d4e8310271f6706e6045ce4f41b041dd34fba6603"
 dependencies = [
  "libc",
 ]

Diff for: compiler/rustc_codegen_gcc/Cargo.toml

@@ -22,7 +22,7 @@ master = ["gccjit/master"]
 default = ["master"]
 
 [dependencies]
-gccjit = "2.0"
+gccjit = "2.1"
 
 # Local copy.
 #gccjit = { path = "../gccjit.rs" }

Diff for: compiler/rustc_codegen_gcc/Readme.md

@@ -12,6 +12,14 @@ This is a GCC codegen for rustc, which means it can be loaded by the existing ru
 The primary goal of this project is to be able to compile Rust code on platforms unsupported by LLVM.
 A secondary goal is to check if using the gcc backend will provide any run-time speed improvement for the programs compiled using rustc.
 
+### Dependencies
+
+**rustup:** Follow the instructions on the official [website](https://www.rust-lang.org/tools/install)
+
+**DejaGnu:** Consider to install DejaGnu which is necessary for running the libgccjit test suite. [website](https://www.gnu.org/software/dejagnu/#downloading)
+
+
+
 ## Building
 
 **This requires a patched libgccjit in order to work.
@@ -80,7 +88,7 @@ Then you can run commands like this:
 
 ```bash
 $ ./y.sh prepare # download and patch sysroot src and install hyperfine for benchmarking
-$ ./y.sh build --release
+$ ./y.sh build --sysroot --release
 ```
 
 To run the tests:
@@ -91,10 +99,16 @@ $ ./y.sh test --release
 
 ## Usage
 
-`$CG_GCCJIT_DIR` is the directory you cloned this repo into in the following instructions:
+You have to run these commands, in the corresponding order:
 
 ```bash
-export CG_GCCJIT_DIR=[the full path to rustc_codegen_gcc]
+$ ./y.sh prepare
+$ ./y.sh build --sysroot
+```
+To check if all is  working correctly, run:
+
+ ```bash
+$ ./y.sh cargo build --manifest-path tests/hello-world/Cargo.toml
 ```
 
 ### Cargo
@@ -107,8 +121,7 @@ If you compiled cg_gccjit in debug mode (aka you didn't pass `--release` to `./y
 
 ### LTO
 
-To use LTO, you need to set the variable `FAT_LTO=1` and `EMBED_LTO_BITCODE=1` in addition to setting `lto = "fat"` in the `Cargo.toml`.
-Don't set `FAT_LTO` when compiling the sysroot, though: only set `EMBED_LTO_BITCODE=1`.
+To use LTO, you need to set the variable `EMBED_LTO_BITCODE=1` in addition to setting `lto = "fat"` in the `Cargo.toml`.
 
 Failing to set `EMBED_LTO_BITCODE` will give you the following error:
 
@@ -118,26 +131,33 @@ error: failed to copy bitcode to object file: No such file or directory (os erro
 
 ### Rustc
 
-> You should prefer using the Cargo method.
+If you want to run `rustc` directly, you can do so with:
+
+```bash
+$ ./y.sh rustc my_crate.rs
+```
+
+You can do the same manually (although we don't recommend it):
 
 ```bash
 $ LIBRARY_PATH="[gcc-path value]" LD_LIBRARY_PATH="[gcc-path value]" rustc +$(cat $CG_GCCJIT_DIR/rust-toolchain | grep 'channel' | cut -d '=' -f 2 | sed 's/"//g' | sed 's/ //g') -Cpanic=abort -Zcodegen-backend=$CG_GCCJIT_DIR/target/release/librustc_codegen_gcc.so --sysroot $CG_GCCJIT_DIR/build_sysroot/sysroot my_crate.rs
 ```
 
 ## Env vars
 
-<dl>
-    <dt>CG_GCCJIT_INCR_CACHE_DISABLED</dt>
-    <dd>Don't cache object files in the incremental cache. Useful during development of cg_gccjit
-    to make it possible to use incremental mode for all analyses performed by rustc without caching
-    object files when their content should have been changed by a change to cg_gccjit.</dd>
-    <dt>CG_GCCJIT_DISPLAY_CG_TIME</dt>
-    <dd>Display the time it took to perform codegen for a crate</dd>
-    <dt>CG_RUSTFLAGS</dt>
-    <dd>Send additional flags to rustc. Can be used to build the sysroot without unwinding by setting `CG_RUSTFLAGS=-Cpanic=abort`.</dd>
-    <dt>CG_GCCJIT_DUMP_TO_FILE</dt>
-    <dd>Dump a C-like representation to /tmp/gccjit_dumps and enable debug info in order to debug this C-like representation.</dd>
-</dl>
+ * _**CG_GCCJIT_DUMP_ALL_MODULES**_: Enables dumping of all compilation modules. When set to "1", a dump is created for each module during compilation and stored in `/tmp/reproducers/`.
+ * _**CG_GCCJIT_DUMP_MODULE**_: Enables dumping of a specific module. When set with the module name, e.g., `CG_GCCJIT_DUMP_MODULE=module_name`, a dump of that specific module is created in `/tmp/reproducers/`.
+ * _**CG_RUSTFLAGS**_: Send additional flags to rustc. Can be used to build the sysroot without unwinding by setting `CG_RUSTFLAGS=-Cpanic=abort`.
+ * _**CG_GCCJIT_DUMP_TO_FILE**_: Dump a C-like representation to /tmp/gccjit_dumps and enable debug info in order to debug this C-like representation.
+ * _**CG_GCCJIT_DUMP_RTL**_: Dumps RTL (Register Transfer Language) for virtual registers.
+ * _**CG_GCCJIT_DUMP_RTL_ALL**_: Dumps all RTL passes.
+ * _**CG_GCCJIT_DUMP_TREE_ALL**_: Dumps all tree (GIMPLE) passes.
+ * _**CG_GCCJIT_DUMP_IPA_ALL**_: Dumps all Interprocedural Analysis (IPA) passes.
+ * _**CG_GCCJIT_DUMP_CODE**_: Dumps the final generated code.
+ * _**CG_GCCJIT_DUMP_GIMPLE**_: Dumps the initial GIMPLE representation.
+ * _**CG_GCCJIT_DUMP_EVERYTHING**_: Enables dumping of all intermediate representations and passes.
+ * _**CG_GCCJIT_KEEP_INTERMEDIATES**_: Keeps intermediate files generated during the compilation process.
+ * _**CG_GCCJIT_VERBOSE**_: Enables verbose output from the GCC driver.
 
 ## Extra documentation