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-rw-r--r--site_scons/site_tools/ccache.py11
1 files changed, 11 insertions, 0 deletions
diff --git a/site_scons/site_tools/ccache.py b/site_scons/site_tools/ccache.py
index 07de63f70a9..1a34571cc7e 100644
--- a/site_scons/site_tools/ccache.py
+++ b/site_scons/site_tools/ccache.py
@@ -111,6 +111,17 @@ 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# but it doesn't work or is out of date.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