firmware: apply build flags globally, move --cfg handling to build.rs.

artiq/firmware/libksupport/Cargo.toml

@@ -2,6 +2,7 @@
 authors = ["M-Labs"]
 name = "ksupport"
 version = "0.0.0"
+build = "build.rs"
 
 [lib]
 name = "ksupport"

artiq/firmware/libksupport/build.rs

@@ -0,0 +1,17 @@
+use std::env;
+use std::path::Path;
+use std::io::{BufRead, BufReader};
+use std::fs::File;
+
+fn main() {
+    let out_dir = env::var("BUILDINC_DIRECTORY").unwrap();
+    let cfg_path = Path::new(&out_dir).join("generated").join("rust-cfg");
+    println!("cargo:rerun-if-changed={}", cfg_path.to_str().unwrap());
+
+    let f = BufReader::new(File::open(&cfg_path).unwrap());
+    for line in f.lines() {
+        println!("cargo:rustc-cfg={}", line.unwrap());
+    }
+
+    println!("cargo:rustc-cfg={}", "ksupport");
+}

artiq/firmware/runtime/build.rs

@@ -2,13 +2,22 @@ extern crate walkdir;
 
 use std::env;
 use std::fs::File;
-use std::io::Write;
+use std::io::{Write, BufRead, BufReader};
 use std::path::Path;
 use std::process::Command;
 
 use walkdir::WalkDir;
 
 fn main() {
+    let out_dir = env::var("BUILDINC_DIRECTORY").unwrap();
+    let cfg_path = Path::new(&out_dir).join("generated").join("rust-cfg");
+    println!("cargo:rerun-if-changed={}", cfg_path.to_str().unwrap());
+
+    let f = BufReader::new(File::open(&cfg_path).unwrap());
+    for line in f.lines() {
+        println!("cargo:rustc-cfg={}", line.unwrap());
+    }
+
     let out_dir = env::var("OUT_DIR").unwrap();
     let dest_path = Path::new(&out_dir).join("git_info.rs");
     let mut f = File::create(&dest_path).unwrap();

artiq/runtime/Makefile

@@ -6,9 +6,8 @@ PYTHON ?= python3.5
 OBJECTS := flash_storage.o main.o
 OBJECTS_KSUPPORT := ksupport_glue.o artiq_personality.o
 
-RUSTOUT_DIRECTORY := cargo/or1k-unknown-none/debug
-CORE_IO_COMMIT := d40c593f42fafbac1ff3d827f6df96338b5b7d8b
-export CORE_IO_COMMIT
+RUSTOUT := cargo/or1k-unknown-none/debug
+RUSTOUT_KSUPPORT := cargo-ksupport/or1k-unknown-none/debug
 
 CFLAGS += \
 	-I$(LIBALLOC_DIRECTORY) \
@@ -31,17 +30,14 @@ LDFLAGS += --gc-sections \
 
 all: runtime.bin runtime.fbi
 
-.PHONY: $(RUSTOUT_DIRECTORY)/libruntime.a
-$(RUSTOUT_DIRECTORY)/libruntime.a: ksupport.elf
+.PHONY: $(RUSTOUT)/libruntime.a
+$(RUSTOUT)/libruntime.a: ksupport.elf
+	RUSTFLAGS="-C target-feature=+mul,+div,+ffl1,+cmov,+addc -C opt-level=s -Cpanic=abort" \
 	CARGO_TARGET_DIR=$(realpath .)/cargo \
-		cargo rustc --verbose \
-			--manifest-path $(realpath $(RUNTIME_DIRECTORY)/../firmware/runtime/Cargo.toml) \
-			--target=or1k-unknown-none -- \
-			$(shell cat $(BUILDINC_DIRECTORY)/generated/rust-cfg) \
-			-C target-feature=+mul,+div,+ffl1,+cmov,+addc -C opt-level=s -Cpanic=abort \
-			-L../libcompiler-rt
+		cargo build --target=or1k-unknown-none \
+			--manifest-path $(realpath $(RUNTIME_DIRECTORY)/../firmware/runtime/Cargo.toml)
 
-runtime.elf: $(OBJECTS) $(RUSTOUT_DIRECTORY)/libruntime.a
+runtime.elf: $(OBJECTS) $(RUSTOUT)/libruntime.a
 	$(LD) $(LDFLAGS) \
 		-T $(RUNTIME_DIRECTORY)/runtime.ld \
 		-o $@ \
@@ -49,18 +45,14 @@ runtime.elf: $(OBJECTS) $(RUSTOUT_DIRECTORY)/libruntime.a
 		-lbase-nofloat -lcompiler-rt -lalloc -llwip
 	@chmod -x $@
 
-.PHONY: $(RUSTOUT_DIRECTORY)/libksupport.a
-$(RUSTOUT_DIRECTORY)/libksupport.a:
-	CARGO_TARGET_DIR=$(realpath .)/cargo \
-		cargo rustc --verbose \
-			--manifest-path $(realpath $(RUNTIME_DIRECTORY)/../firmware/libksupport/Cargo.toml) \
-			--target=or1k-unknown-none -- \
-			$(shell cat $(BUILDINC_DIRECTORY)/generated/rust-cfg) \
-			--cfg ksupport \
-			-C target-feature=+mul,+div,+ffl1,+cmov,+addc -C opt-level=s -Cpanic=unwind \
-			-L../libcompiler-rt
+.PHONY: $(RUSTOUT_KSUPPORT)/libksupport.a
+$(RUSTOUT_KSUPPORT)/libksupport.a:
+	RUSTFLAGS="-C target-feature=+mul,+div,+ffl1,+cmov,+addc -C opt-level=s -Cpanic=unwind" \
+	CARGO_TARGET_DIR=$(realpath .)/cargo-ksupport \
+		cargo build --target=or1k-unknown-none \
+			--manifest-path $(realpath $(RUNTIME_DIRECTORY)/../firmware/libksupport/Cargo.toml)
 
-ksupport.elf: $(OBJECTS_KSUPPORT) $(RUSTOUT_DIRECTORY)/libksupport.a
+ksupport.elf: $(OBJECTS_KSUPPORT) $(RUSTOUT_KSUPPORT)/libksupport.a
 	$(LD) $(LDFLAGS) \
 		--eh-frame-hdr \
 		-T $(RUNTIME_DIRECTORY)/ksupport.ld \