Improve support for AVR and MSP430 custom targets

.cspell.json

@@ -48,6 +48,7 @@
   "ignorePaths": [
     // TODO
     "src/imp/**",
+    "target-specs/**",
     "**/linker.ld"
   ]
 }

CHANGELOG.md

@@ -10,6 +10,10 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Fix build error when not using `portable_atomic_unsafe_assume_single_core` cfg on AVR and MSP430 custom targets. ([#50](https://github.com/taiki-e/portable-atomic/pull/50))
+
+  Since 0.3.11, atomic CAS was supported without the cfg on AVR and MSP430 builtin targets, but that change was not applied to custom targets.
+
 ## [0.3.17] - 2022-12-14
 
 - Optimize x86_64 128-bit atomic load/store on AMD CPU with AVX. ([#49](https://github.com/taiki-e/portable-atomic/pull/49))

src/imp/mod.rs

@@ -2,15 +2,19 @@
 // Lock-free implementations
 
 // cfg(target_has_atomic_load_store = "ptr")
-#[cfg(not(portable_atomic_no_atomic_load_store))]
+#[cfg(not(any(
+    portable_atomic_no_atomic_load_store,
+    portable_atomic_unsafe_assume_single_core,
+    target_arch = "avr",
+    target_arch = "msp430",
+)))]
 #[cfg_attr(
     not(portable_atomic_no_cfg_target_has_atomic),
     cfg(not(all(
         any(target_arch = "riscv32", target_arch = "riscv64"),
         not(target_has_atomic = "ptr")
     )))
 )]
-#[cfg(any(test, not(portable_atomic_unsafe_assume_single_core)))]
 mod core_atomic;
 
 // Miri and Sanitizer do not support inline assembly.
@@ -137,38 +141,27 @@ pub(crate) mod float;
 // -----------------------------------------------------------------------------
 
 // Atomic{Isize,Usize,Bool,Ptr}, Atomic{I,U}{8,16}
-#[cfg_attr(
-    portable_atomic_no_cfg_target_has_atomic,
-    cfg(any(
-        not(portable_atomic_no_atomic_cas),
-        all(
-            not(portable_atomic_no_atomic_load_store),
-            not(portable_atomic_unsafe_assume_single_core)
-        )
-    ))
-)]
+#[cfg(not(any(
+    portable_atomic_no_atomic_load_store,
+    portable_atomic_unsafe_assume_single_core,
+    target_arch = "avr",
+    target_arch = "msp430",
+)))]
 #[cfg_attr(
     not(portable_atomic_no_cfg_target_has_atomic),
-    cfg(any(
-        target_has_atomic = "ptr",
-        all(
-            not(portable_atomic_no_atomic_load_store),
-            not(portable_atomic_unsafe_assume_single_core),
-            not(all(
-                any(target_arch = "riscv32", target_arch = "riscv64"),
-                not(target_has_atomic = "ptr")
-            ))
-        )
-    ))
+    cfg(not(all(
+        any(target_arch = "riscv32", target_arch = "riscv64"),
+        not(target_has_atomic = "ptr")
+    )))
 )]
 pub(crate) use self::core_atomic::{
     AtomicBool, AtomicI16, AtomicI8, AtomicIsize, AtomicPtr, AtomicU16, AtomicU8, AtomicUsize,
 };
 // RISC-V without A-extension
 #[cfg(not(portable_atomic_unsafe_assume_single_core))]
-#[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
 #[cfg_attr(portable_atomic_no_cfg_target_has_atomic, cfg(portable_atomic_no_atomic_cas))]
 #[cfg_attr(not(portable_atomic_no_cfg_target_has_atomic), cfg(not(target_has_atomic = "ptr")))]
+#[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
 pub(crate) use self::riscv::{
     AtomicBool, AtomicI16, AtomicI8, AtomicIsize, AtomicPtr, AtomicU16, AtomicU8, AtomicUsize,
 };
@@ -185,37 +178,25 @@ pub(crate) use self::interrupt::{
 };
 
 // Atomic{I,U}32
-#[cfg(not(target_pointer_width = "16"))]
-#[cfg_attr(
-    portable_atomic_no_cfg_target_has_atomic,
-    cfg(any(
-        not(portable_atomic_no_atomic_cas),
-        all(
-            not(portable_atomic_no_atomic_load_store),
-            not(portable_atomic_unsafe_assume_single_core)
-        )
-    ))
-)]
+#[cfg(not(any(
+    portable_atomic_no_atomic_load_store,
+    portable_atomic_unsafe_assume_single_core,
+    target_arch = "avr",
+    target_arch = "msp430",
+)))]
 #[cfg_attr(
     not(portable_atomic_no_cfg_target_has_atomic),
-    cfg(any(
-        target_has_atomic = "ptr",
-        all(
-            not(portable_atomic_no_atomic_load_store),
-            not(portable_atomic_unsafe_assume_single_core),
-            not(all(
-                any(target_arch = "riscv32", target_arch = "riscv64"),
-                not(target_has_atomic = "ptr")
-            ))
-        )
-    ))
+    cfg(not(all(
+        any(target_arch = "riscv32", target_arch = "riscv64"),
+        not(target_has_atomic = "ptr")
+    )))
 )]
 pub(crate) use self::core_atomic::{AtomicI32, AtomicU32};
 // RISC-V without A-extension
 #[cfg(not(portable_atomic_unsafe_assume_single_core))]
-#[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
 #[cfg_attr(portable_atomic_no_cfg_target_has_atomic, cfg(portable_atomic_no_atomic_cas))]
 #[cfg_attr(not(portable_atomic_no_cfg_target_has_atomic), cfg(not(target_has_atomic = "ptr")))]
+#[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
 pub(crate) use self::riscv::{AtomicI32, AtomicU32};
 // no core Atomic{I,U}32 & no CAS & assume single core => critical section based fallback
 #[cfg(any(not(target_pointer_width = "16"), feature = "fallback"))]
@@ -229,15 +210,17 @@ pub(crate) use self::riscv::{AtomicI32, AtomicU32};
 pub(crate) use self::interrupt::{AtomicI32, AtomicU32};
 
 // Atomic{I,U}64
+#[cfg(not(any(
+    portable_atomic_no_atomic_load_store,
+    portable_atomic_unsafe_assume_single_core,
+)))]
 #[cfg_attr(portable_atomic_no_cfg_target_has_atomic, cfg(not(portable_atomic_no_atomic_64)))]
 #[cfg_attr(
     not(portable_atomic_no_cfg_target_has_atomic),
     cfg(any(
         target_has_atomic = "64",
         all(
             not(any(target_pointer_width = "16", target_pointer_width = "32")),
-            not(portable_atomic_no_atomic_load_store),
-            not(portable_atomic_unsafe_assume_single_core),
             not(all(
                 any(target_arch = "riscv32", target_arch = "riscv64"),
                 not(target_has_atomic = "ptr")
@@ -248,16 +231,20 @@ pub(crate) use self::interrupt::{AtomicI32, AtomicU32};
 pub(crate) use self::core_atomic::{AtomicI64, AtomicU64};
 // RISC-V without A-extension
 #[cfg(not(portable_atomic_unsafe_assume_single_core))]
-#[cfg(target_arch = "riscv64")]
 #[cfg_attr(portable_atomic_no_cfg_target_has_atomic, cfg(portable_atomic_no_atomic_cas))]
 #[cfg_attr(not(portable_atomic_no_cfg_target_has_atomic), cfg(not(target_has_atomic = "ptr")))]
+#[cfg(target_arch = "riscv64")]
 pub(crate) use self::riscv::{AtomicI64, AtomicU64};
 // no core Atomic{I,U}64 & has CAS => use lock-base fallback
 #[cfg(feature = "fallback")]
-#[cfg_attr(portable_atomic_no_cfg_target_has_atomic, cfg(portable_atomic_no_atomic_64))]
-#[cfg_attr(not(portable_atomic_no_cfg_target_has_atomic), cfg(not(target_has_atomic = "64")))]
-#[cfg_attr(portable_atomic_no_cfg_target_has_atomic, cfg(not(portable_atomic_no_atomic_cas)))]
-#[cfg_attr(not(portable_atomic_no_cfg_target_has_atomic), cfg(target_has_atomic = "ptr"))]
+#[cfg_attr(
+    portable_atomic_no_cfg_target_has_atomic,
+    cfg(all(portable_atomic_no_atomic_64, not(portable_atomic_no_atomic_cas)))
+)]
+#[cfg_attr(
+    not(portable_atomic_no_cfg_target_has_atomic),
+    cfg(all(not(target_has_atomic = "64"), target_has_atomic = "ptr"))
+)]
 pub(crate) use self::fallback::{AtomicI64, AtomicU64};
 // no core Atomic{I,U}64 & no CAS & assume single core => critical section based fallback
 #[cfg(any(

target-specs/avr-unknown-gnu-atmega168.json

@@ -0,0 +1,20 @@
+{
+  "arch": "avr",
+  "atomic-cas": false,
+  "cpu": "atmega168",
+  "data-layout": "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8",
+  "eh-frame-header": false,
+  "exe-suffix": ".elf",
+  "late-link-args": {
+    "gcc": ["-lgcc"]
+  },
+  "linker": "avr-gcc",
+  "llvm-target": "avr-unknown-unknown",
+  "max-atomic-width": 0,
+  "pre-link-args": {
+    "gcc": ["-mmcu=atmega168"]
+  },
+  "relocation-model": "static",
+  "target-c-int-width": "16",
+  "target-pointer-width": "16"
+}

target-specs/msp430-unknown-none-elf.json

@@ -0,0 +1,18 @@
+{
+  "arch": "msp430",
+  "asm-args": ["-mcpu=msp430"],
+  "atomic-cas": false,
+  "data-layout": "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16",
+  "default-codegen-units": 1,
+  "eh-frame-header": false,
+  "emit-debug-gdb-scripts": false,
+  "linker": "msp430-elf-gcc",
+  "linker-is-gnu": false,
+  "llvm-target": "msp430-none-elf",
+  "max-atomic-width": 0,
+  "panic-strategy": "abort",
+  "relocation-model": "static",
+  "target-c-int-width": "16",
+  "target-pointer-width": "16",
+  "trap-unreachable": false
+}

tools/build.sh

@@ -9,14 +9,16 @@ trap -- 'exit 0' SIGINT
 
 default_targets=(
     # no atomic load/store (16-bit)
+    avr-unknown-gnu-atmega168 # for checking custom target
     avr-unknown-gnu-atmega328
     msp430-none-elf
+    msp430-unknown-none-elf # same as msp430-none-elf, but for checking custom target
     # no atomic load/store (32-bit)
     riscv32i-unknown-none-elf
     riscv32im-unknown-none-elf
     riscv32imc-unknown-none-elf
     # no atomic load/store (64-bit)
-    riscv64i-unknown-none-elf
+    riscv64i-unknown-none-elf # custom target
 
     # no atomic CAS (32-bit)
     thumbv4t-none-eabi