---- a/src/ccache.c
-+++ b/src/ccache.c
-@@ -2277,6 +2277,7 @@ calculate_object_hash(struct args *args,
- "CPLUS_INCLUDE_PATH",
- "OBJC_INCLUDE_PATH",
- "OBJCPLUS_INCLUDE_PATH", // clang
-+ "GCC_HONOUR_COPTS",
- NULL
- };
- for (const char **p = envvars; *p; ++p) {
+--- 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);