diff options
Diffstat (limited to 'site_scons/site_tools/ccache.py')
| -rw-r--r-- | site_scons/site_tools/ccache.py | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/site_scons/site_tools/ccache.py b/site_scons/site_tools/ccache.py index 13a49463c46..76fef32d9b7 100644 --- a/site_scons/site_tools/ccache.py +++ b/site_scons/site_tools/ccache.py @@ -103,6 +103,17 @@ def generate(env): # but it doesn't work or is out of date. env["CCACHE_VERSION"] = _ccache_version_found + # Set up a performant ccache configuration. Here, we don't use a second preprocessor and + # pass preprocessor arguments that deterministically expand source files so a stable + # hash can be calculated on them. This both reduces the amount of work ccache needs to + # do and increases the likelihood of a cache hit. + env["ENV"]["CCACHE_NOCPP2"] = 1 + if env.ToolchainIs("clang"): + env.AppendUnique(CCFLAGS=["-frewrite-includes"]) + elif env.ToolchainIs("gcc"): + env.AppendUnique(CCFLAGS=["-fdirectives-only"]) + + # Make a generator to expand to CCACHE in the case where we are # not a conftest. We don't want to use ccache for configure tests # because we don't want to use icecream for configure tests, but |