Saw this doing a full build today. Quick look it is a coding error, but what ever project this is doesn't have chromium_code:1 set so we aren't getting -Wall and -Wextra which is probably why this slipped in in the first place, other things might be lurking as a result in that compile too. src/third_party/WebKit/WebKit/chromium/../../WebKitTools/DumpRenderTree/chromium/ImageDiff.cpp: In function 'bool writeFile(const char*, const unsigned char*, size_t)': src/third_party/WebKit/WebKit/chromium/../../WebKitTools/DumpRenderTree/chromium/ImageDiff.cpp:324: warning: format '%s' expects type 'char*', but argument 3 has type 'FILE*'
*** This bug has been marked as a duplicate of bug 43747 ***