# HG changeset patch
# Parent 9dfb537207e5e0f280d5b4b7a2cadde3eebcada2
# User Jeff Walden <jwalden@mit.edu>
Bug 851237 - Mark the static-assert typedef with an unused attribute so it doesn't trigger compiler warnings.  NOT REVIEWED YET

diff --git a/mfbt/Assertions.h b/mfbt/Assertions.h
--- a/mfbt/Assertions.h
+++ b/mfbt/Assertions.h
@@ -76,6 +76,11 @@
 #  endif
 #endif
 #ifndef MOZ_STATIC_ASSERT
+#  if defined(__GNUC__)
+#    define MOZ_STATIC_ASSERT_UNUSED_ATTRIBUTE __attribute__((unused))
+#  else
+#    define MOZ_STATIC_ASSERT_UNUSED_ATTRIBUTE /* nothing */
+#  endif
 #  define MOZ_STATIC_ASSERT_GLUE1(x, y)          x##y
 #  define MOZ_STATIC_ASSERT_GLUE(x, y)           MOZ_STATIC_ASSERT_GLUE1(x, y)
 #  if defined(__SUNPRO_CC)
@@ -108,10 +113,10 @@
       * code.
       */
 #    define MOZ_STATIC_ASSERT(cond, reason) \
-       typedef int MOZ_STATIC_ASSERT_GLUE(moz_static_assert, __COUNTER__)[(cond) ? 1 : -1]
+       typedef int MOZ_STATIC_ASSERT_GLUE(moz_static_assert, __COUNTER__)[(cond) ? 1 : -1] MOZ_STATIC_ASSERT_UNUSED_ATTRIBUTE
 #  else
 #    define MOZ_STATIC_ASSERT(cond, reason) \
-       extern void MOZ_STATIC_ASSERT_GLUE(moz_static_assert, __LINE__)(int arg[(cond) ? 1 : -1])
+       extern void MOZ_STATIC_ASSERT_GLUE(moz_static_assert, __LINE__)(int arg[(cond) ? 1 : -1]) MOZ_STATIC_ASSERT_UNUSED_ATTRIBUTE
 #  endif
 #endif