Files
clang-p2996/llvm/lib/Support/CMakeLists.txt
Reid Kleckner 697d6cb8ee [cmake] Speed up check-llvm 5x by delay loading shell32 and ole32
Summary:
Previously, check-llvm on my Windows 10 workstation took about 300s to
run, and it would lock up my mouse. Now, it takes just under 60s.
Previously running the tests only used about 15% of the available CPU
time, now it uses up to 60%.

Shell32.dll and ole32.dll have direct dependencies on user32.dll and
gdi32.dll. These DLLs are mostly used to for Windows GUI functionality,
which most LLVM tools don't need. It seems that these DLLs acquire and
release some system resources on startup and exit, and that requires
acquiring the same highly contended lock discussed in this post:
https://randomascii.wordpress.com/2017/07/09/24-core-cpu-and-i-cant-move-my-mouse/

Most LLVM tools still have a transitive dependency on
SHGetKnownFolderPathW, which is used to look up the user home directory
and local AppData directory. We also use SHFileOperationW to recursively
delete a directory, but only LLDB and clang-doc use this today. At some
point, we might consider removing these last shell32.dll deps, but for
now, I would like to take this free performance.

Many thanks to Bruce Dawson for suggesting this fix. He looked at an ETW
trace of an LLVM test run, noticed these DLLs, and suggested avoiding
them.

Reviewers: zturner, pcc, thakis

Subscribers: mgorny, llvm-commits, hiraditya

Differential Revision: https://reviews.llvm.org/D51952

llvm-svn: 342002
2018-09-11 22:25:13 +00:00

177 lines
3.9 KiB
CMake

set(system_libs)
if ( LLVM_ENABLE_ZLIB AND HAVE_LIBZ )
set(system_libs ${system_libs} ${ZLIB_LIBRARIES})
endif()
if( MSVC OR MINGW )
# libuuid required for FOLDERID_Profile usage in lib/Support/Windows/Path.inc.
# advapi32 required for CryptAcquireContextW in lib/Support/Windows/Path.inc.
set(system_libs ${system_libs} psapi shell32 ole32 uuid advapi32)
elseif( CMAKE_HOST_UNIX )
if( HAVE_LIBRT )
set(system_libs ${system_libs} rt)
endif()
if( HAVE_LIBDL )
set(system_libs ${system_libs} ${CMAKE_DL_LIBS})
endif()
if( HAVE_BACKTRACE AND NOT "${Backtrace_LIBRARIES}" STREQUAL "" )
# On BSDs, CMake returns a fully qualified path to the backtrace library.
# We need to remove the path and the 'lib' prefix, to make it look like a
# regular short library name, suitable for appending to a -l link flag.
get_filename_component(Backtrace_LIBFILE ${Backtrace_LIBRARIES} NAME_WE)
STRING(REGEX REPLACE "^lib" "" Backtrace_LIBFILE ${Backtrace_LIBFILE})
set(system_libs ${system_libs} ${Backtrace_LIBFILE})
endif()
if(LLVM_ENABLE_TERMINFO)
if(HAVE_TERMINFO)
set(system_libs ${system_libs} ${TERMINFO_LIBS})
endif()
endif()
if( LLVM_ENABLE_THREADS AND HAVE_LIBATOMIC )
set(system_libs ${system_libs} atomic)
endif()
set(system_libs ${system_libs} ${LLVM_PTHREAD_LIB})
if( UNIX AND NOT (BEOS OR HAIKU) )
set(system_libs ${system_libs} m)
endif()
if( FUCHSIA )
set(system_libs ${system_libs} zircon)
endif()
endif( MSVC OR MINGW )
# Delay load shell32.dll if possible to speed up process startup.
set (delayload_flags)
if (MSVC)
set (delayload_flags delayimp -delayload:shell32.dll -delayload:ole32.dll)
endif()
add_llvm_library(LLVMSupport
AMDGPUMetadata.cpp
APFloat.cpp
APInt.cpp
APSInt.cpp
ARMBuildAttrs.cpp
ARMAttributeParser.cpp
ARMWinEH.cpp
Allocator.cpp
BinaryStreamError.cpp
BinaryStreamReader.cpp
BinaryStreamRef.cpp
BinaryStreamWriter.cpp
BlockFrequency.cpp
BranchProbability.cpp
CachePruning.cpp
circular_raw_ostream.cpp
Chrono.cpp
COM.cpp
CodeGenCoverage.cpp
CommandLine.cpp
Compression.cpp
ConvertUTF.cpp
ConvertUTFWrapper.cpp
CrashRecoveryContext.cpp
DataExtractor.cpp
Debug.cpp
DebugCounter.cpp
DeltaAlgorithm.cpp
DAGDeltaAlgorithm.cpp
DJB.cpp
Error.cpp
ErrorHandling.cpp
FileCheck.cpp
FileUtilities.cpp
FileOutputBuffer.cpp
FoldingSet.cpp
FormattedStream.cpp
FormatVariadic.cpp
GlobPattern.cpp
GraphWriter.cpp
Hashing.cpp
InitLLVM.cpp
IntEqClasses.cpp
IntervalMap.cpp
ItaniumManglingCanonicalizer.cpp
JamCRC.cpp
JSON.cpp
KnownBits.cpp
LEB128.cpp
LineIterator.cpp
Locale.cpp
LockFileManager.cpp
LowLevelType.cpp
ManagedStatic.cpp
MathExtras.cpp
MemoryBuffer.cpp
MD5.cpp
NativeFormatting.cpp
Options.cpp
Parallel.cpp
PluginLoader.cpp
PrettyStackTrace.cpp
RandomNumberGenerator.cpp
Regex.cpp
ScaledNumber.cpp
ScopedPrinter.cpp
SHA1.cpp
SmallPtrSet.cpp
SmallVector.cpp
SourceMgr.cpp
SpecialCaseList.cpp
Statistic.cpp
StringExtras.cpp
StringMap.cpp
StringPool.cpp
StringSaver.cpp
StringRef.cpp
SystemUtils.cpp
TarWriter.cpp
TargetParser.cpp
ThreadPool.cpp
Timer.cpp
ToolOutputFile.cpp
TrigramIndex.cpp
Triple.cpp
Twine.cpp
Unicode.cpp
UnicodeCaseFold.cpp
VersionTuple.cpp
WithColor.cpp
YAMLParser.cpp
YAMLTraits.cpp
raw_os_ostream.cpp
raw_ostream.cpp
regcomp.c
regerror.c
regexec.c
regfree.c
regstrlcpy.c
xxhash.cpp
# System
Atomic.cpp
DynamicLibrary.cpp
Errno.cpp
Host.cpp
Memory.cpp
Mutex.cpp
Path.cpp
Process.cpp
Program.cpp
RWMutex.cpp
Signals.cpp
TargetRegistry.cpp
ThreadLocal.cpp
Threading.cpp
Valgrind.cpp
Watchdog.cpp
ADDITIONAL_HEADER_DIRS
Unix
Windows
${LLVM_MAIN_INCLUDE_DIR}/llvm/ADT
${LLVM_MAIN_INCLUDE_DIR}/llvm/Support
${Backtrace_INCLUDE_DIRS}
LINK_LIBS ${system_libs} ${delayload_flags}
)
set_property(TARGET LLVMSupport PROPERTY LLVM_SYSTEM_LIBS "${system_libs}")