Silence spurious clang warnings

Silence clang warnings under --enable-expensive-hardening, including:
  + implicit truncation of 64 bit values to 32 bit;
  + const char assignment to self;
  + tautological compare; and
  + additional parentheses around equality tests. (gcc uses these to
    silence assignment, so clang warns when they're present in an
    equality test. But we need to use extra parentheses in macros to
    isolate them from other code).

1 files changed, 10 insertions, 0 deletions

diff --git a/changes/spurious-clang-warnings b/changes/spurious-clang-warnings
new file mode 100644
index 0000000000..d039920476
--- /dev/null
+++ b/changes/spurious-clang-warnings
@@ -0,0 +1,10 @@
+  o Minor bugfixes:
+    - Silence clang warnings under --enable-expensive-hardening, including:
+        + implicit truncation of 64 bit values to 32 bit;
+        + const char assignment to self;
+        + tautological compare; and
+        + additional parentheses around equality tests. (gcc uses these to
+          silence assignment, so clang warns when they're present in an
+          equality test. But we need to use extra parentheses in macros to
+          isolate them from other code).
+      Fixes bug 13577.