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Disable Visual C++ 2013 Debug mode assert on null pointer in some STL algorithms,

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such as std::equal on the third argument. This reverts previous workarounds.

Predefining _DEBUG_POINTER_IMPL disables Visual C++ 2013 headers from defining
it to a function performing the null pointer check. In practice, it's not that
bad since any function actually using the nullptr will seg fault. The other
iterator sanity checks remain enabled in the headers.

Reviewed by Aaron Ballmanþ and Duncan P. N. Exon Smith.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245711 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Yaron Keren 2015-08-21 17:31:03 +00:00
parent ded00c79af
commit 3f1c66ca7d
4 changed files with 7 additions and 5 deletions
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6
cmake/modules/HandleLLVMOptions.cmake
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@ -247,6 +247,12 @@ if( MSVC_IDE )
endif()
if( MSVC )
if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0 )
# For MSVC 2013, disable iterator null pointer checking in debug mode,
# especially so std::equal(nullptr, nullptr, nullptr) will not assert.
add_llvm_definitions("-D_DEBUG_POINTER_IMPL=")
endif()
include(ChooseMSVCCRT)
if( NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11) )

2
docs/CodingStandards.rst
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@ -178,8 +178,6 @@ being aware of:
* While most of the atomics library is well implemented, the fences are
missing. Fortunately, they are rarely needed.
* The locale support is incomplete.
* ``std::equal()`` (and other algorithms) incorrectly assert in MSVC when given
``nullptr`` as an iterator.
Other than these areas you should assume the standard library is available and
working as expected until some build bot tells you otherwise. If you're in an

2
include/llvm/ADT/ArrayRef.h
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@ -156,8 +156,6 @@ namespace llvm {
bool equals(ArrayRef RHS) const {
if (Length != RHS.Length)
return false;
if (Length == 0)
return true;
return std::equal(begin(), end(), RHS.begin());
}

2
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -5676,7 +5676,7 @@ UpdateNodeOperands(SDNode *N, ArrayRef<SDValue> Ops) {
"Update with wrong number of operands");
// If no operands changed just return the input node.
if (Ops.empty() || std::equal(Ops.begin(), Ops.end(), N->op_begin()))
if (std::equal(Ops.begin(), Ops.end(), N->op_begin()))
return N;
// See if the modified node already exists.