Compliling Xen 4.5.0 Fails with error: ‘bufioreq_pfn’ may be used uninitialised in this function [-Werror=uninitialized]

[Ian Murray <murrayie@yahoo.co.uk>]

Hi,

This was originally posted to the user list but it was suggested to me to post it here also. I am getting a failed compilation when I try to compile Xen 4.5.0 from the tarball and also from Git. I can compile RC4, although a bisect reveals that they pertinent difference is debug=y in Config.mk, which allows it to compile. That compiles without a problem and that is what I am running with. I have tried to build on two different servers with the same result, however both are running Ubuntu 12.04.5 and are similarly configured.

Steps I (would) use to build are simply...

./configure
make dist
make install


which results in...

...
gcc -O2 -fomit-frame-pointer -m64 -fno-strict-aliasing -std=gnu99 -Wall 
-Wstrict-prototypes -Wdeclaration-after-statement -Wno-unused-but-set-variable  
-DNDEBUG -I/root/xen450/xen-4.5.0/xen/include  
-I/root/xen450/xen-4.5.0/xen/include/asm-x86/mach-generic 
-I/root/xen450/xen-4.5.0/xen/include/asm-x86/mach-default -msoft-float 
-fno-stack-protector -fno-exceptions -Wnested-externs -DHAVE_GAS_VMX 
-DHAVE_GAS_EPT -DHAVE_GAS_FSGSBASE -mno-red-zone -mno-sse -fpic 
-fno-asynchronous-unwind-tables -DGCC_HAS_VISIBILITY_ATTRIBUTE -fno-builtin 
-fno-common -Werror -Wredundant-decls -Wno-pointer-arith -pipe -g -D__XEN__ 
-include /root/xen450/xen-4.5.0/xen/include/xen/config.h -nostdinc -DHAS_ACPI 
-DHAS_GDBSX -DHAS_PASSTHROUGH -DHAS_MEM_ACCESS -DHAS_MEM_PAGING 
-DHAS_MEM_SHARING -DHAS_PCI -DHAS_IOPORTS -DHAS_PDX -MMD -MF .hvm.o.d -c hvm.c 
-o hvm.o
hvm.c: In function ‘hvm_create_ioreq_server’:
hvm.c:487:18: error: ‘bufioreq_pfn’ may be used uninitialised in this function 
[-Werror=uninitialized]
hvm.c:718:30: note: ‘bufioreq_pfn’ was declared here
cc1: all warnings being treated as errors
make[5]: *** [hvm.o] Error 1

Any suggestions are welcome,

Thanks for reading,

Ian.

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