From: Nguyen Thai Ngoc Duy Date: Fri, 18 Nov 2011 14:12:02 GMT Subject: Re: A flaw in dep generation with gcc -MMD? Message-ID: In-Reply-To: On Fri, Nov 18, 2011 at 6:34 PM, Nguyen Thai Ngoc Duy wrote: > OK it's not gcc problem. I upgraded to 4.5.3 and still had the same > problem. I used ccache though. Without ccache, gcc produced correct > .o.d files. "gcc -MF depfile -MMD -MP -c -o path/to/file.o" will produce "depfile" with target given by "-o". When ccache runs, it executes "gcc -MF depfile -MMD -MP -E" instead to get the final content for hashing. Notice that "-c -o" combination is replaced by "-E". The latter produces target without leading path. Not sure if I should report this to ccache or gcc. In the meantime, may be we should recognize the situation and switch off COMPUTE_HEADER_DEPENDENCIES when ccache is used (maybe hard). -- Duy