Re: [Xen-devel] Errors of doing "make install-tools" with xen-4.2-unstable?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-05-11 at 15:08 +0100, Bei Guan wrote:
> When I do the "make install-tools" with xen-4.2-unstable, there are
> some errors about "warn_unused_result".
> Is it the error in code or the error in the compiling environment?
> Thank you so much.

This commit
        changeset:   25275:27d63b9f111a
        user:        Keir Fraser <keir@xxxxxxx>
        date:        Thu May 10 11:22:18 2012 +0100
        summary:     blktap2: Do not build with -O0
has caused more warnings to be generated by the compiler, which in turn
leads to build failures. Since this is a compiler specific thing we are
still tracking them all down.

Can you confirm which versionof xen-unstable.hg you are using -- there
have been several fixup patches since the above. If you are completely
up to date and you still see errors we can dig into whatever is left.

Ian. (starting to think that this change wasn't suitable during a
feature freeze....)

> 
> 
> gcc  -O1 -fno-omit-frame-pointer -m64 -g -fno-strict-aliasing
> -std=gnu99 -Wall -Wstrict-prototypes -Wdeclaration-after-statement
> -D__XEN_TOOLS__ -MMD -MF .tapdisk-queue.o.d  -D_LARGEFILE_SOURCE
> -D_LARGEFILE64_SOURCE -fno-optimize-sibling-calls -Werror -g
> -Wno-unused -fno-strict-aliasing -I../include -I../drivers
> -I/root/Xen/xen-4.2-unstable/tools/blktap2/drivers/../../../tools/libxc 
> -I/root/Xen/xen-4.2-unstable/tools/blktap2/drivers/../../../tools/include 
> -D_GNU_SOURCE -DUSE_NFS_LOCKS -fPIC -I 
> /root/Xen/xen-4.2-unstable/tools/blktap2/drivers/../../../tools/libaio/src  
> -c -o tapdisk-queue.o tapdisk-queue.c 
> cc1: warnings being treated as errors
> tapdisk-queue.c: In function âtapdisk_lio_ack_eventâ:
> tapdisk-queue.c:438: error: ignoring return value of âreadâ, declared
> with attribute warn_unused_result
> make[5]: *** [tapdisk-queue.o] Error 1
> make[5]: Leaving directory
> `/root/Xen/xen-4.2-unstable/tools/blktap2/drivers'
> make[4]: *** [subdir-install-drivers] Error 2
> make[4]: Leaving directory `/root/Xen/xen-4.2-unstable/tools/blktap2'
> make[3]: *** [subdirs-install] Error 2
> make[3]: Leaving directory `/root/Xen/xen-4.2-unstable/tools/blktap2'
> make[2]: *** [subdir-install-blktap2] Error 2
> make[2]: Leaving directory `/root/Xen/xen-4.2-unstable/tools'
> make[1]: *** [subdirs-install] Error 2
> make[1]: Leaving directory `/root/Xen/xen-4.2-unstable/tools'
> make: *** [install-tools] Error 2
> ------
> root/Xen/xen-4.2-unstable/tools/blktap2/drivers/../../../tools/libaio/src  -c 
> -o tapdisk-log.o tapdisk-log.c 
> cc1: warnings being treated as errors
> tapdisk-log.c: In function âtlog_flushâ:
> tapdisk-log.c:250: error: ignoring return value of âwriteâ, declared
> with attribute warn_unused_result
> ------
> /root/Xen/xen-4.2-unstable/tools/blktap2/drivers/../../../tools/libaio/src  
> -c -o tapdisk2.o tapdisk2.c 
> cc1: warnings being treated as errors
> tapdisk2.c: In function âmainâ:
> tapdisk2.c:82: error: ignoring return value of âchdirâ, declared with
> attribute warn_unused_result
> ------
> cc1: warnings being treated as errors
> tapdisk-stream.c: In function âtapdisk_stream_poll_clearâ:
> tapdisk-stream.c:148: error: ignoring return value of âreadâ, declared
> with attribute warn_unused_result
> tapdisk-stream.c: In function âtapdisk_stream_poll_setâ:
> tapdisk-stream.c:158: error: ignoring return value of âwriteâ,
> declared with attribute warn_unused_result
> tapdisk-stream.c: In function âtapdisk_stream_print_requestâ:
> tapdisk-stream.c:206: error: ignoring return value of âwriteâ,
> declared with attribute warn_unused_result
> 
> 
> 
> Best Regards,
> Bei Guan
> 



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