Date: Mon, 20 Jun 2011 14:09:23 -0500 From: Stephen Montgomery-Smith <stephen@missouri.edu> To: Chuck Swiger <cswiger@mac.com> Cc: Niclas Zeising <niclas.zeising@gmail.com>, Roman Divacky <rdivacky@freebsd.org>, "freebsd-ports@freebsd.org" <freebsd-ports@freebsd.org> Subject: Re: [ANNOUNCE]: clang compiling ports Message-ID: <4DFF9AE3.10609@missouri.edu> In-Reply-To: <432743E3-272A-40F5-AF31-6C1805F620F3@mac.com> References: <20110620153753.GA41541@freebsd.org> <4DFF73E3.5010405@gmail.com> <4DFF76C7.5070001@missouri.edu> <432743E3-272A-40F5-AF31-6C1805F620F3@mac.com>
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On 06/20/2011 12:59 PM, Chuck Swiger wrote: > On Jun 20, 2011, at 9:35 AM, Stephen Montgomery-Smith wrote: >> What I would like is a primer on how to suppress all the warnings and errors created by K&R code. > > OK: > > http://clang.llvm.org/docs/UsersManual.html#cl_diagnostics Yes, I did see that. > Of course, you can only suppress warnings; you cannot suppress actual errors. > > clang doesn't currently support -traditional aka pure K&R C. It's possible that compiling with -ansi aka -std=c89 might help-- at least you should get -Wno-implicit-function-declaration and maybe -Wno-implicit-int. > >> Also, why is this an error: >> error: non-void function 'top_button_cross' should return a value [-Wreturn-type] >> when most everything else is a warning. (See http://pointyhat.freebsd.org/errorlogs/amd64-errorlogs/e.9-exp.20110616185105/xppaut-5.99.log.) > > top_button_cross() probably should be declared as returning void. What's presumably happening is that it gets a default return type of int since it doesn't otherwise specify a return type, and then fails to have an explicit return, which is an error. Is a return with no value, from a function of type int, meant to be an error in K&R code? If so, I will change the code so that "return" becomes "return 0". Otherwise, I think the clang compiler should be changed so that this is a warning, not an error. Or at least an error that can be switched off with -Wno-return-type. I will say that I have no desire to put ansii patches into working K&R code. Stephen
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