Remove Metal feature (lambdaclass#993)

* rm all metal features

* fix clippy

* fix attribute

* fix another attribute

Author: ColoCarletti

.github/workflows/ci.yaml

@@ -182,7 +182,7 @@ jobs:
           components: clippy
 
       - name: Run clippy
-        run: make clippy-metal
+        run: make clippy
 
       - name: Run tests
-        run: make test-metal
+        run: make test

Makefile

@@ -1,4 +1,4 @@
-.PHONY: test clippy docker-shell nix-shell benchmarks benchmark docs build-cuda build-metal clippy-metal test-metal coverage clean
+.PHONY: test clippy docker-shell nix-shell benchmarks benchmark docs build-cuda coverage clean
 
 FUZZ_DIR = fuzz/no_gpu_fuzz
 
@@ -33,18 +33,8 @@ benchmark:
 flamegraph_stark:
 	CARGO_PROFILE_BENCH_DEBUG=true cargo flamegraph --root --bench stark_benchmarks -- --bench
 
-coverage: 
+coverage:
 	cargo llvm-cov nextest --lcov --output-path lcov.info
-	
-METAL_DIR = math/src/gpu/metal
-build-metal:
-	xcrun -sdk macosx metal $(METAL_DIR)/all.metal -o $(METAL_DIR)/lib.metallib
-
-clippy-metal:
-	cargo clippy --workspace --all-targets -F metal -- -D warnings
-
-test-metal: 
-	cargo test -F metal
 
 CUDA_DIR = math/src/gpu/cuda/shaders
 CUDA_FILES:=$(wildcard $(CUDA_DIR)/**/*.cu)
@@ -69,10 +59,6 @@ run-fuzzer:
 
 proof-deserializer-fuzzer:
 		cargo +nightly fuzz run --fuzz-dir $(FUZZ_DIR)  deserialize_stark_proof
-		
-run-metal-fuzzer:
-		cd fuzz/metal_fuzz
-		cargo +nightly fuzz run --fuzz-dir  $(FUZZ_DIR) fft_diff
 
 run-cuda-fuzzer:
 		cd fuzz/cuda_fuzz

README.md

@@ -135,7 +135,7 @@ This can be used in a multi prover setting for extra security, or as a standalon
 
 ### Fuzzers
 
-Fuzzers are divided between the ones that use only the CPU, the ones that use Metal, and the ones that use CUDA.
+Fuzzers are divided between the ones that use only the CPU, and the ones that use CUDA.
 
 To use them, make sure you have installed ```cargo fuzzer```
 
@@ -153,7 +153,7 @@ make run-fuzzer FUZZER=stark252
 
 The list of fuzzers can be found in `fuzz/no_gpu_fuzz`
 
-Fuzzers for FTT in Metal and Cuda can be run with `make run-metal-fuzzer` and `make run-cuda-fuzzer`
+Fuzzers for FTT in Cuda can be run with `make run-cuda-fuzzer`
 
 
 Run a specific fuzzer from the ones contained in **fuzz/fuzz_targets/** folder with`cargo`, for example to run the one for the target `field_from_hex`:
@@ -222,7 +222,7 @@ The following links, repos, companies and projects have been important in the de
 
 # Security
 
-We take security seriously. If you discover a vulnerability in this project, please report it responsibly. 
+We take security seriously. If you discover a vulnerability in this project, please report it responsibly.
 
 - You can report vulnerabilities directly via the **[GitHub "Report a Vulnerability" feature](../../security/advisories/new)**.
 - Alternatively, send an email to **[security@lambdaclass.com](mailto:security@lambdaclass.com)**.

crates/gpu/Cargo.toml

@@ -9,8 +9,6 @@ license.workspace = true
 
 [dependencies]
 thiserror = "1.0.38"
-metal = { version = "0.24.0", optional = true }
-objc = { version = "0.2.7", optional = true }
 
 [dev-dependencies]
 proptest = "1.1.0"
@@ -20,7 +18,6 @@ rand = "0.8.5"
 walkdir = { version = "2.3.3", optional = true }
 
 [features]
-metal = ["dep:metal", "dep:objc"]
 cuda = ["dep:walkdir"]
 
 # Some features activate compilation of code which isn't

crates/gpu/build.rs

@@ -50,43 +50,7 @@ fn compile_cuda_shaders() {
     });
 }
 
-#[cfg(feature = "metal")]
-fn compile_metal_shaders() {
-    use std::process::Command;
-    let source_dir = env!("CARGO_MANIFEST_DIR").to_string() + "/../math/src/gpu/metal";
-
-    // Tell cargo to invalidate the built crate whenever the source changes
-    println!("cargo:rerun-if-changed={source_dir}");
-
-    let input = source_dir.clone() + "/all.metal";
-    let output = source_dir + "/lib.metallib";
-
-    println!("cargo:warning=compiling:'{input}'->'{output}'");
-
-    let cmd = Command::new("xcrun")
-        .args(["-sdk", "macosx", "metal"])
-        .arg(&input)
-        .arg("-o")
-        .arg(&output)
-        .spawn()
-        .expect("Failed to spawn process");
-
-    let res = cmd.wait_with_output().expect("Command waiting failed");
-
-    if !res.status.success() {
-        println!();
-        println!("{}", String::from_utf8(res.stdout).unwrap());
-        println!();
-        eprintln!("{}", String::from_utf8(res.stderr).unwrap());
-        println!();
-        panic!("Compilation failed for source '{}'", input);
-    }
-}
-
 fn main() {
     #[cfg(feature = "cuda")]
     compile_cuda_shaders();
-
-    #[cfg(feature = "metal")]
-    compile_metal_shaders();
 }

crates/gpu/src/lib.rs

@@ -1,11 +1,2 @@
-#[cfg(all(feature = "metal", feature = "cuda"))]
-compile_error!(
-    "Can't enable both \"metal\" and \"cuda\" features at the same time.
-If you were using the `--all-features` flag please read this crate's Cargo.toml"
-);
-
-#[cfg(feature = "metal")]
-pub mod metal;
-
 #[cfg(feature = "cuda")]
 pub mod cuda;