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cmake: set CCACHE_BASEDIR & CCACHE_NOHASHDIR when using ccache

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Dramatically improves build performance when building multiple
projects in different directories.
This commit is contained in:
Angus Gratton 2018-03-16 11:58:52 +11:00 committed by Angus Gratton
parent 800bffb8b0
commit 6bdc49b6e4
2 changed files with 29 additions and 10 deletions
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10
tools/cmake/idf_functions.cmake
View File

@ -98,10 +98,12 @@ function(idf_set_global_compiler_options)
add_compile_options("-I${CMAKE_BINARY_DIR}") # for sdkconfig.h
# Enable ccache if it's on the path
find_program(CCACHE_FOUND ccache)
if(CCACHE_FOUND)
message(STATUS "ccache will be used")
set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
if(NOT CCACHE_DISABLE)
find_program(CCACHE_FOUND ccache)
if(CCACHE_FOUND)
message(STATUS "ccache will be used for faster builds")
set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
endif()
endif()
endfunction()

29
tools/idf.py
View File

@ -56,11 +56,12 @@ else:
MAKE_GENERATOR = "Unix Makefiles"
GENERATORS = [
# ('generator name', 'build command line', 'version command line')
("Ninja", [ "ninja" ], [ "ninja", "--version" ]),
(MAKE_GENERATOR, [ MAKE_CMD, "-j", str(multiprocessing.cpu_count()+2) ], [ "make", "--version" ]),
# ('generator name', 'build command line', 'version command line', 'verbose flag')
("Ninja", [ "ninja" ], [ "ninja", "--version" ], "-v"),
(MAKE_GENERATOR, [ MAKE_CMD, "-j", str(multiprocessing.cpu_count()+2) ], [ "make", "--version" ], "VERBOSE=1"),
]
GENERATOR_CMDS = dict( (a[0], a[1]) for a in GENERATORS )
GENERATOR_VERBOSE = dict( (a[0], a[3]) for a in GENERATORS )
def _run_tool(tool_name, args, cwd):
def quote_arg(arg):
@ -107,7 +108,7 @@ def detect_cmake_generator():
"""
Find the default cmake generator, if none was specified. Raises an exception if no valid generator is found.
"""
for (generator, _, version_check) in GENERATORS:
for (generator, _, version_check, _) in GENERATORS:
if executable_exists(version_check):
return generator
raise FatalError("To use idf.py, either the 'ninja' or 'GNU make' build tool must be available in the PATH")
@ -144,6 +145,8 @@ def _ensure_build_directory(args, always_run_cmake=False):
cmake_args = ["cmake", "-G", args.generator]
if not args.no_warnings:
cmake_args += [ "--warn-uninitialized" ]
if args.no_ccache:
cmake_args += [ "-DCCACHE_DISABLE=1" ]
cmake_args += [ project_dir]
_run_tool("cmake", cmake_args, cwd=args.build_dir)
except:
@ -167,7 +170,7 @@ def _ensure_build_directory(args, always_run_cmake=False):
try:
home_dir = cache["CMAKE_HOME_DIRECTORY"]
if os.path.realpath(home_dir) != os.path.realpath(project_dir):
if os.path.normcase(os.path.realpath(home_dir)) != os.path.normcase(os.path.realpath(project_dir)):
raise FatalError("Build directory '%s' configured for project '%s' not '%s'. Run 'idf.py fullclean' to start again."
% (build_dir, os.path.realpath(home_dir), os.path.realpath(project_dir)))
except KeyError:
@ -201,6 +204,18 @@ def build_target(target_name, args):
"""
_ensure_build_directory(args)
generator_cmd = GENERATOR_CMDS[args.generator]
if not args.no_ccache:
# Setting CCACHE_BASEDIR & CCACHE_NO_HASHDIR ensures that project paths aren't stored in the ccache entries
# (this means ccache hits can be shared between different projects. It may mean that some debug information
# will point to files in another project, if these files are perfect duplicates of each other.)
#
# It would be nicer to set these from cmake, but there's no cross-platform way to set build-time environment
#os.environ["CCACHE_BASEDIR"] = args.build_dir
#os.environ["CCACHE_NO_HASHDIR"] = "1"
pass
if args.verbose:
generator_cmd += [ GENERATOR_VERBOSE[args.generator] ]
_run_tool(generator_cmd[0], generator_cmd + [target_name], args.build_dir)
@ -319,7 +334,9 @@ def main():
parser.add_argument('-C', '--project-dir', help="Project directory", default=os.getcwd())
parser.add_argument('-B', '--build-dir', help="Build directory", default=None)
parser.add_argument('-G', '--generator', help="Cmake generator", choices=GENERATOR_CMDS.keys())
parser.add_argument('-n', '--no-warnings', help="Disable Cmake warnings")
parser.add_argument('-n', '--no-warnings', help="Disable Cmake warnings", action="store_true")
parser.add_argument('-v', '--verbose', help="Verbose build output", action="store_true")
parser.add_argument('--no-ccache', help="Disable ccache. Otherwise, if ccache is available on the PATH then it will be used for faster builds.", action="store_true")
parser.add_argument('actions', help="Actions (build targets or other operations)", nargs='+',
choices=ACTIONS.keys())