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Code Issues Releases Activity

SERVER-8463 Make control of link time optimization explicit

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This commit is contained in:
Andrew Morrow 2013-03-04 17:06:17 -05:00
parent 037ccf6382
commit 1b2a4e07f2
1 changed files with 26 additions and 6 deletions
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@ -156,6 +156,7 @@ add_option( "full", "include client and headers when doing scons install", 0 , F
add_option( "release" , "release build" , 0 , True )
add_option( "static" , "fully static build" , 0 , False )
add_option( "static-libstdc++" , "statically link libstdc++" , 0 , False )
add_option( "lto", "enable link time optimizations (experimental, except with MSVC)" , 0 , True )
# base compile flags
add_option( "64" , "whether to force 64 bit" , 0 , True , "force64" )
@ -636,12 +637,6 @@ elif "win32" == os.sys.platform:
# /MT: use the multithreaded, static version of the run-time library (LIBCMT.lib)
env.Append( CCFLAGS= ["/O2", "/Oy-", "/MT"] )
# TODO: this has caused some linking problems :
# /GL whole program optimization
# /LTCG link time code generation
env.Append( CCFLAGS= ["/GL"] )
env.Append( LINKFLAGS=" /LTCG " )
env.Append( ARFLAGS=" /LTCG " ) # for the Library Manager
# /DEBUG will tell the linker to create a .pdb file
# which WinDbg and Visual Studio will use to resolve
# symbols if you want to debug a release-mode image.
@ -1000,6 +995,31 @@ def doConfigure(myenv):
print( 'libc++ requested, but compiler does not support -stdlib=libc++' )
Exit(1)
# Apply any link time optimization settings as selected by the 'lto' option.
if has_option('lto'):
if using_msvc():
# Note that this is actually more aggressive than LTO, it is whole program
# optimization due to /GL. However, this is historically what we have done for
# windows, so we are keeping it.
#
# /GL implies /LTCG, so no need to say it in CCFLAGS, but we do need /LTCG on the
# link flags.
myenv.Append(CCFLAGS=['/GL'])
myenv.Append(LINKFLAGS=['/LTCG'])
myenv.Append(ARFLAGS=['/LTCG'])
elif using_gcc() or using_clang():
# For GCC and clang, the flag is -flto, and we need to pass it both on the compile
# and link lines.
if AddToCCFLAGSIfSupported(myenv, '-flto'):
myenv.Append(LINKFLAGS=['-flto'])
else:
print( "Link time optimization requested, " +
"but selected compiler does not honor -flto" )
Exit(1)
else:
printf("Don't know how to enable --lto on current toolchain")
Exit(1)
# glibc's memcmp is faster than gcc's
if linux:
AddToCCFLAGSIfSupported(myenv, "-fno-builtin-memcmp")