[Xen-devel] xen/x86: unable to build with gcc5

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

This was originally reported against Xen 4.4 in
http://bugs.debian.org/778181 but I have reproduced with current staging
using debug=n. Compiler I used is:
        $ gcc --version
        gcc (Debian 5-20150205-1) 5.0.0 20150205 (experimental) [trunk revision 
220455]

Error: size of boot.o:.text is 0x026c
/build/gcc5/xen.git/xen/Rules.mk:180: recipe for target 'boot.init.o' failed

$ objdump -t ./xen/arch/x86/efi/boot.o | grep -P '[^t]\.text[^\.]'
0000000000000000 l    d  .text  0000000000000000 .text
0000000000000000 l     F .text  00000000000000e9 pre_parse.constprop.9
00000000000000f0 l     F .text  0000000000000123 get_value.constprop.10
0000000000000220 l     F .text  000000000000004c set_color.part.4.constprop.11

pre_parse, get_value and set_color are all annotated with __init, but I
guess this is something else. Any idea what to do? Possibly a gcc bug?

Building with -k -s I also see:

Error: size of unxz.o:.text is 0x06b
->
0000000000000000 l    d  .text  0000000000000000 .text
0000000000000000 l     F .text  000000000000006b dec_vli.isra.1

Error: size of dmi_scan.o:.text is 0x018f
->
 grep -P '[^t]\.text\b'
0000000000000000 l    d  .text  0000000000000000 .text
0000000000000000 l     F .text  000000000000018f _dmi_iterate.constprop.6

And:

symbols.c: In function 'symbols_lookup':
symbols.c:128:359: error: array subscript is above array bounds 
[-Werror=array-bounds]
symbols.c:136:176: error: array subscript is above array bounds 
[-Werror=array-bounds]

from common/symbols.c. I suppose because of
        extern const unsigned int symbols_offsets[1]
        #define symbols_address(n) (SYMBOLS_ORIGIN + symbols_offsets[n])

I'm not sure why that needs to be a singleton array instead of []?

Ian.


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