fix: flexible build.rs for algorithms (support both host and stm32)

.cargo/config.toml

@@ -1,7 +1,6 @@
 [target.thumbv6m-none-eabi]
 runner = 'probe-rs run --chip STM32L053R8'
 
-
 [alias]
 arun = "run --target thumbv6m-none-eabi"
 atest = "test --target x86_64-unknown-linux-gnu"

crates/algorithms/algorithms-c/README.md

@@ -1,7 +1,7 @@
 # Algorithms-c
 
-This subproject contains all C Code for the benchmarking. It is built with 
-[ceedling](https://www.throwtheswitch.org/ceedling), a more modern build tool 
+This subproject contains all C Code for the benchmarking. It is built with
+[ceedling](https://www.throwtheswitch.org/ceedling), a more modern build tool
 for C projects that also integrates well with the Unity framework.
 
 ## Compiler
@@ -12,9 +12,13 @@ To compile for STM32, you need to crosscompile
 # apt install binutils-arm-none-eabi gcc-arm-none-eabi
 ```
 
-Then, use your tool with an `arm-none-eabi-` prefix: `arm-none-eabi-gcc`. This 
-project has been configured to use `arm-none-eabi-gcc` to compile modules and to 
-"link" the object files into a static library with `arm-none-eabi-ar`.
+Then, use your tool with an `arm-none-eabi-` prefix: `arm-none-eabi-gcc`. This
+project has been configured to use the compiler specified in `$CC` to compile modules and `$AR` to
+"link" the object files (this should be `ar` for a static library like this).
 
-The unit tests will be compiled with `gcc` to be ran on the host computer, not 
-on the STM32.
+```bash
+# compile for STM32
+CC=arm-none-eabi-gcc AR=arm-none-eabi-ar ceedling release
+# compile for this computer
+CC=gcc AR=ar ceedling release
+```

crates/algorithms/algorithms-c/project.yml

@@ -381,7 +381,7 @@
 #     :name: 
 #     :optional: FALSE
   :release_compiler: 
-    :executable: arm-none-eabi-gcc
+    :executable: "#{ENV['CC']}"
     :arguments: 
       - "-g" 
       - "-Wall"
@@ -391,7 +391,7 @@
       - "${2}"
     :optional: FALSE
   :release_linker: 
-    :executable: arm-none-eabi-ar
+    :executable: "#{ENV['AR']}"
     :arguments:
       - "-rcs"
       - "${2}"

crates/algorithms/benches/crc32bench.rs

@@ -1,12 +1,12 @@
-use crc::{Crc, Crc32, ffi};
+use algorithms::crc::{CHECK_DATA, Crc, Crc32, ffi};
 use criterion::{Criterion, black_box, criterion_group, criterion_main};
 
 pub fn criterion_benchmark(c: &mut Criterion) {
     c.bench_function("crc32", |b| {
-        b.iter(|| Crc32::checksum(black_box(&crc::CHECK_DATA)))
+        b.iter(|| Crc32::checksum(black_box(&CHECK_DATA)))
     });
     c.bench_function("ffi::crc32", |b| {
-        b.iter(|| ffi::Crc32::checksum(black_box(&crc::CHECK_DATA)))
+        b.iter(|| ffi::Crc32::checksum(black_box(&CHECK_DATA)))
     });
 }
 

crates/algorithms/benches/crc32bench_iai.rs

@@ -1,11 +1,11 @@
-use crc::{Crc, Crc32, ffi};
+use algorithms::crc::{CHECK_DATA, Crc, Crc32, ffi};
 use iai::black_box;
 
 fn iai_benchmark_native() -> <Crc32 as Crc>::Checksum {
-    Crc32::checksum(black_box(&crc::CHECK_DATA))
+    Crc32::checksum(black_box(&CHECK_DATA))
 }
 fn iai_benchmark_ffi() -> <Crc32 as Crc>::Checksum {
-    ffi::Crc32::checksum(black_box(&crc::CHECK_DATA))
+    ffi::Crc32::checksum(black_box(&CHECK_DATA))
 }
 
 iai::main!(iai_benchmark_native, iai_benchmark_ffi);

crates/algorithms/build.rs

@@ -1,6 +1,31 @@
+fn env(s: &str) -> String {
+    std::env::var(s).unwrap()
+}
+
 fn main() {
-    let status = std::process::Command::new("ceedling")
-        .arg("release")
+    std::process::Command::new("ceedling")
+        .arg("clobber")
+        .current_dir("./algorithms-c/")
+        .status()
+        .expect("could not cleanup old algorithms-c files");
+
+    let mut cmd = std::process::Command::new("ceedling");
+    cmd.arg("release");
+
+    let arch = env("CARGO_CFG_TARGET_ARCH");
+    let pw = env("CARGO_CFG_TARGET_POINTER_WIDTH");
+    let os = env("CARGO_CFG_TARGET_OS");
+
+    if arch == "arm" && pw == "32" && os == "none" {
+        cmd.env("CC", "arm-none-eabi-gcc")
+            .env("AR", "arm-none-eabi-ar");
+    } else if os == "linux" {
+        cmd.env("CC", "gcc").env("AR", "ar");
+    } else {
+        panic!("Unsupported build target")
+    }
+
+    let status = cmd
         .current_dir("./algorithms-c/")
         .status()
         .expect("could not make c stuff");