Where can I find a list of all available warning and error flags I can set in clang and gcc? I've looked all over both of their respective documentation sites, and I can't find anything.
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5 Answers
gcc --help=warnings,seperate
gcc --help=warnings,joined
gcc --help=warnings,undocumented
gcc --help=warnings
seperate flags are like boolean values; they are either on or off.
-Wflag means on. -Wno-flag means off.
joined flags are flags that require a value.
-Wflag=value
by typing gcc --help=warnings you will recieve all the warning options provided by your compiler.
EDIT:
looking at GNU Documentation, these warnings messages have existed since GCC 4.3.6
3 Comments
Heath Borders
Can you update this with a required gcc version? I'm on OSX 10.8.2, which has llvm-gcc-4.2 by default, and these options don't work for me.
Trevor Hickey
@HeathBorders your version of gcc is just old enough to not have them.
Will
In particular this discusses many of the flags: Gnu Warnings. And I believe they apply very closely to Clang so can be used in Xcode.
answered Dec 11, 2011 at 18:17
Oliver Charlesworth
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If the question is just to find the list of all possible GCC diagnostic (error, warning, ...) messages, you could use the catalog of messages for localization utilities. With the GCC source tar ball, look inside gcc/po/ or libcpp/po/ or libstdc++-v3/po/ etc.
If you just ask about the options used to get these messages, follow the link in the answer by Oli Charlesworth
answered Dec 11, 2011 at 21:49
Basile Starynkevitch
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For Clang, there is -Weverything, which enables all warning flags.
1 Comment
Heath Borders
Thanks, but I'm interested in what all my options are, so I can turn things on and off.
The classic: man gcc. clang's manpage is not that populated yet, but since it mimics gcc's behavior anyway, many of gcc's -W options also work with clang.
