pw_polyfill: Provide the static_assert macro in C
In C11, assert.h is supposed to define static_assert as a convenience
alias for _Static_assert. Add a wrapper that defines static_assert if
the system header didn't.
Change-Id: Ibcc7d32517388fcb6284bb8b99fc96c76860b063
diff --git a/pw_polyfill/BUILD b/pw_polyfill/BUILD
index 8cb5d1f..3c9669d 100644
--- a/pw_polyfill/BUILD
+++ b/pw_polyfill/BUILD
@@ -35,6 +35,7 @@
pw_cc_library(
name = "overrides",
hdrs = [
+ "public_overrides/assert.h",
"public_overrides/cstddef",
"public_overrides/iterator",
"public_overrides/type_traits",
@@ -46,6 +47,7 @@
pw_cc_library(
name = "standard_library",
hdrs = [
+ "standard_library_public/pw_polyfill/standard_library/assert.h",
"standard_library_public/pw_polyfill/standard_library/cstddef.h",
"standard_library_public/pw_polyfill/standard_library/iterator.h",
"standard_library_public/pw_polyfill/standard_library/type_traits.h",
diff --git a/pw_polyfill/BUILD.gn b/pw_polyfill/BUILD.gn
index 85c1125..c2d00d3 100644
--- a/pw_polyfill/BUILD.gn
+++ b/pw_polyfill/BUILD.gn
@@ -41,6 +41,7 @@
":standard_library",
]
inputs = [
+ "public_overrides/assert.h",
"public_overrides/cstddef",
"public_overrides/iterator",
"public_overrides/type_traits",
@@ -54,6 +55,7 @@
source_set("standard_library") {
public_configs = [ ":standard_library_public" ]
public = [
+ "standard_library_public/pw_polyfill/standard_library/assert.h",
"standard_library_public/pw_polyfill/standard_library/cstddef.h",
"standard_library_public/pw_polyfill/standard_library/iterator.h",
"standard_library_public/pw_polyfill/standard_library/type_traits.h",
diff --git a/pw_polyfill/public_overrides/assert.h b/pw_polyfill/public_overrides/assert.h
new file mode 100644
index 0000000..b2f07e5
--- /dev/null
+++ b/pw_polyfill/public_overrides/assert.h
@@ -0,0 +1,18 @@
+// Copyright 2020 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+#pragma once
+
+#include_next <assert.h>
+
+#include "pw_polyfill/standard_library/assert.h"
diff --git a/pw_polyfill/standard_library_public/pw_polyfill/standard_library/assert.h b/pw_polyfill/standard_library_public/pw_polyfill/standard_library/assert.h
new file mode 100644
index 0000000..30f10f6
--- /dev/null
+++ b/pw_polyfill/standard_library_public/pw_polyfill/standard_library/assert.h
@@ -0,0 +1,27 @@
+// Copyright 2020 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+#pragma once
+
+#include <assert.h>
+
+// In C11, assert.h should define static_assert as _Static_assert.
+#if !defined(__cplusplus) && !defined(static_assert)
+
+#if __STDC_VERSION__ >= 201112L
+#define static_assert _Static_assert
+#else // _Static_assert requires C11.
+#define static_assert(...)
+#endif // __STDC_VERSION__ >= 201112L
+
+#endif // !defined(__cplusplus) && !defined(static_assert)
