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scons: Support clang.

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clang is supports most gcc options / extensions, with a some exceptions.

The biggest advantage of using clang is that compilation times are much
short.

One can tell scons to use clang when building by invoking it as

   CC=clang CXX=clang++ scons libgl-xlib
This commit is contained in:
José Fonseca
2013-04-24 22:02:18 +01:00
parent f0c296773d
commit 1687932d2b
4 changed files with 18 additions and 14 deletions
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24
scons/gallium.py
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@@ -152,7 +152,7 @@ def generate(env):
platform = env['platform']
x86 = env['machine'] == 'x86'
ppc = env['machine'] == 'ppc'
gcc = env['gcc']
gcc_compat = env['gcc'] or env['clang']
msvc = env['msvc']
suncc = env['suncc']
icc = env['icc']
@@ -279,7 +279,7 @@ def generate(env):
('_WIN32_WINNT', '0x0601'),
('WINVER', '0x0601'),
]
if gcc:
if gcc_compat:
cppdefines += [('__MSVCRT_VERSION__', '0x0700')]
if msvc:
cppdefines += [
@@ -309,19 +309,20 @@ def generate(env):
cflags = [] # C
cxxflags = [] # C++
ccflags = [] # C & C++
if gcc:
if gcc_compat:
ccversion = env['CCVERSION']
if env['build'] == 'debug':
ccflags += ['-O0']
elif ccversion.startswith('4.2.'):
elif env['gcc'] and ccversion.startswith('4.2.'):
# gcc 4.2.x optimizer is broken
print "warning: gcc 4.2.x optimizer is broken -- disabling optimizations"
ccflags += ['-O0']
else:
ccflags += ['-O3']
# gcc's builtin memcmp is slower than glibc's
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
ccflags += ['-fno-builtin-memcmp']
if env['gcc']:
# gcc's builtin memcmp is slower than glibc's
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
ccflags += ['-fno-builtin-memcmp']
# Work around aliasing bugs - developers should comment this out
ccflags += ['-fno-strict-aliasing']
ccflags += ['-g']
@@ -329,8 +330,9 @@ def generate(env):
# See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
ccflags += [
'-fno-omit-frame-pointer',
'-fno-optimize-sibling-calls',
]
if env['gcc']:
ccflags += ['-fno-optimize-sibling-calls']
if env['machine'] == 'x86':
ccflags += [
'-m32',
@@ -448,7 +450,7 @@ def generate(env):
env.Append(SHCCFLAGS = ['/LD'])
# Assembler options
if gcc:
if gcc_compat:
if env['machine'] == 'x86':
env.Append(ASFLAGS = ['-m32'])
if env['machine'] == 'x86_64':
@@ -457,7 +459,7 @@ def generate(env):
# Linker options
linkflags = []
shlinkflags = []
if gcc:
if gcc_compat:
if env['machine'] == 'x86':
linkflags += ['-m32']
if env['machine'] == 'x86_64':
@@ -495,7 +497,7 @@ def generate(env):
env.Append(SHLINKFLAGS = shlinkflags)
# We have C++ in several libraries, so always link with the C++ compiler
if env['gcc'] or env['clang']:
if gcc_compat:
env['LINK'] = env['CXX']
# Default libs