Fix c compile

examples/bzlmod/BUILD

@@ -6,7 +6,10 @@ load("@bazel_skylib//rules:build_test.bzl", "build_test")
 
 build_test(
     name = "arm_linux_test",
-    targets = ["//arm-linux:hex"],
+    targets = [
+        "//arm-linux:hex",
+        "//arm-linux:atomics",
+    ],
 )
 
 build_test(

examples/bzlmod/arm-linux/BUILD

@@ -25,10 +25,13 @@ cc_library(
         "-mthumb",
     ],
     includes = ["includes"],
-    target_compatible_with = [
-        "@platforms//cpu:arm",
-        "@platforms//os:linux",
-    ],
+   )
+
+cc_library(
+    name = "atomics",
+    srcs = ["atomics.c"],
+    copts = ["-std=c11"],
+    visibility = ["//visibility:public"],
 )
 
 cc_binary(

examples/bzlmod/arm-linux/atomics.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+// This should pick up the C-variant, not C++ one,
+#include <stdatomic.h>
+
+/**
+ * Minimal C11 stdatomic.h example without threads.
+ *
+ * This example is designed to test the compiler's support for the
+ * C11 _Atomic type specifier and the functions provided by <stdatomic.h>.
+ */
+int main(void) {
+    atomic_int counter = ATOMIC_VAR_INIT(0);
+    atomic_fetch_add(&counter, 1);
+    int final_value = atomic_load(&counter);
+
+    printf("Atomic counter initialized to 0, incremented once.\n");
+    printf("Final value (read atomically): %d\n", final_value);
+
+    return 0;
+}

examples/bzlmod/custom/toolchain/BUILD

@@ -32,7 +32,6 @@ arm_none_eabi_toolchain(
         "-mfloat-abi=hard",
         "-mfpu=fpv4-sp-d16",
     ],
-    gcc_tool = "g++",
     linkopts = [
         "-mcpu=cortex-m4",
         "-mthumb",