--- a/src/ccache.cpp
+++ b/src/ccache.cpp
@@ -1654,6 +1654,7 @@ calculate_result_name(Context& ctx,
"CPLUS_INCLUDE_PATH",
"OBJC_INCLUDE_PATH",
"OBJCPLUS_INCLUDE_PATH", // clang
+ "GCC_HONOUR_COPTS",
nullptr};
for (const char** p = envvars; *p; ++p) {
const char* v = getenv(*p);
