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Date: Tue, 28 Aug 2012 23:19:22 +0200
From: Dimitry Andric <dim@FreeBSD.org>
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To: Eir Nym <eirnym@gmail.com>
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Cc: FreeBSD Mail Lists <freebsd-current@freebsd.org>
Subject: Re: Can't build FreeBSD-head with CLANG
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On 2012-08-28 23:05, Eir Nym wrote:
...
> This one for example:
> cc -c -O2 -pipe -fno-strict-aliasing  -std=c99  -Wall
> -Wredundant-decls -Wnested-externs -Wstrict-prototypes
> -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef
> -Wno-pointer-sign -fformat-extensions  -Wmissing-include-dirs
> -fdiagnostics-show-option  -Wno-error-tautological-compare
> -Wno-error-empty-body  -Wno-error-parentheses-equality -nostdinc  -I.
> -I/usr/head/src/sys -I/usr/head/src/sys/contrib/altq -D_KERNEL
> -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h
> -fno-omit-frame-pointer -mno-aes -mno-avx -mcmodel=kernel
> -mno-red-zone -mno-mmx -mno-sse -msoft-float
> -fno-asynchronous-unwind-tables -ffreestanding -fstack-protector
> -Werror  /usr/head/src/sys/gnu/fs/xfs/xfs_alloc.c
> -I/usr/head/src/sys/gnu/fs/xfs/FreeBSD
> -I/usr/head/src/sys/gnu/fs/xfs/FreeBSD/support
> -I/usr/head/src/sys/gnu/fs/xfs
> /usr/head/src/sys/gnu/fs/xfs/xfs_alloc.c:1449:11: error: variable
> 'fbno' is used uninitialized whenever 'if' condition is false
> [-Werror,-Wsometimes-uninitialized]
>          else if (args->minlen == 1 && args->alignment == 1 && !args->isfl &&
>                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Weird, how are you building the xfs module?  It has WERROR= in its
Makefile, so the '-Werror' option above should not be there.  This is
because the XFS code was imported more than 6 years ago, and is very
unlikely to ever be fixed. :)