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[Modules] Extend Darwin hack to include the modification time of SystemVersion.plist. 

Fixes <rdar://problem/13856838>.

llvm-svn: 181635
This commit is contained in:
Douglas Gregor 2013-05-10 21:54:08 +00:00
parent 38079fd26f
commit d7193795bd
1 changed files with 7 additions and 1 deletions
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8
clang/lib/Frontend/CompilerInvocation.cpp
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@ -30,6 +30,7 @@
#include "llvm/Support/Host.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/system_error.h"
#include <sys/stat.h>
using namespace clang;
//===----------------------------------------------------------------------===//
@ -1689,7 +1690,8 @@ std::string CompilerInvocation::getModuleHash() const {
hsOpts.UseStandardCXXIncludes,
hsOpts.UseLibcxx);
// Darwin-specific hack: if we have a sysroot, use the contents of
// Darwin-specific hack: if we have a sysroot, use the contents and
// modification time of
// $sysroot/System/Library/CoreServices/SystemVersion.plist
// as part of the module hash.
if (!hsOpts.Sysroot.empty()) {
@ -1702,6 +1704,10 @@ std::string CompilerInvocation::getModuleHash() const {
llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
if (!llvm::MemoryBuffer::getFile(systemVersionFile, buffer)) {
code = hash_combine(code, buffer.get()->getBuffer());
struct stat statBuf;
if (stat(systemVersionFile.c_str(), &statBuf) == 0)
code = hash_combine(code, statBuf.st_mtime);
}
}