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Make the host endianness check an integer constant expression.

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I will remove the isBigEndianHost function once I update clang.

The ifdef logic is designed to
* not use configure/cmake to avoid breaking -arch i686 -arch ppc.
* default to little endian
* be as small as possible

It looks like sys/endian.h is the preferred header on most modern BSD systems,
but it is better to change this in a followup patch as machine/endian.h is
available on FreeBSD, OpenBSD, NetBSD and OS X.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179527 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2013-04-15 14:44:24 +00:00
parent 604b3573f9
commit 21a01d1ea8
8 changed files with 30 additions and 22 deletions
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2
lib/Support/DataExtractor.cpp
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@ -20,7 +20,7 @@ static T getU(uint32_t *offset_ptr, const DataExtractor *de,
uint32_t offset = *offset_ptr;
if (de->isValidOffsetForDataOfSize(offset, sizeof(val))) {
std::memcpy(&val, &Data[offset], sizeof(val));
if (sys::isLittleEndianHost() != isLittleEndian)
if (sys::IsLittleEndianHost != isLittleEndian)
val = sys::SwapByteOrder(val);
// Advance the offset