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Disable Clang -Wtautological-constant-compare.

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This is a recent Clang warning, but it's far too aggressive. The earlier
unsigned long silliness was worth fixing, but it otherwise complains on
32-bit platforms with:

  if (some_size_t > 0xffffffff) {
    ...
  }

which is unreasonable as, on 64-bit platforms, this check is meaningful
and requiring the programmer add ifdefs is error-prone. This matches
Chromium in https://crbug.com/767059.

Bug: chromium:767059
Change-Id: I0bb0f3a4b60f222e9d1b3c569471fbcf5518caed
Reviewed-on: https://boringssl-review.googlesource.com/23845
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
This commit is contained in:
David Benjamin 2017-12-04 17:19:49 -05:00 committed by CQ bot account: commit-bot@chromium.org
parent 56d5d7085d
commit 6979c7e8eb
1 changed files with 18 additions and 0 deletions
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18
CMakeLists.txt
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@ -1,5 +1,11 @@
cmake_minimum_required (VERSION 2.8.11)
# Report AppleClang separately from Clang. Their version numbers are different.
# https://cmake.org/cmake/help/v3.0/policy/CMP0025.html
if(POLICY CMP0025)
cmake_policy(SET CMP0025 NEW)
endif()
# Defer enabling C and CXX languages.
project (BoringSSL NONE)
@ -63,6 +69,18 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CLANG)
set(C_CXX_FLAGS "${C_CXX_FLAGS} -Wno-free-nonheap-object")
endif()
if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
NOT "6.0.0" VERSION_GREATER CMAKE_C_COMPILER_VERSION)
# Clang's -Wtautological-constant-compare is far too aggressive and does not
# account for, say, wanting the same code to work on both 32-bit and 64-bit
# platforms.
#
# Note "Clang" and "AppleClang" version differently, so we check for an
# exact match on the COMPILER_ID. As of writing, the warning is not in any
# release of AppleClang yet.
set(C_CXX_FLAGS "${C_CXX_FLAGS} -Wno-tautological-constant-compare -Wtautological-constant-out-of-range-compare")
endif()
if(CLANG OR NOT "7.0.0" VERSION_GREATER CMAKE_C_COMPILER_VERSION)
set(C_CXX_FLAGS "${C_CXX_FLAGS} -Wimplicit-fallthrough")
endif()