[OE-core] syslinux + gcc 5.2 build error

[Andre McCurdy]

On Wed, Oct 14, 2015 at 11:37 PM, Khem Raj <raj.khem at gmail.com> wrote:
>
>> On Oct 14, 2015, at 2:38 PM, Andre McCurdy <armccurdy at gmail.com> wrote:
>>
>> I'm seeing what looks like a gcc bug when building syslinux with
>> certain combinations of TUNE_CCARGS. A specific combination which
>> fails is:
>>
>>  TUNE_CCARGS = " -m32 -march=core2 -mtune=core2 -msse3 -mfpmath=sse
>> -fschedule-insns”
>
>
> and why would you use -fschedule-insns on something like ia32 with so few general purpose regs
> at disposal ?
> applying any insn schedule opts before machine registers are assigned may not always work.

Mainly just following advice from Intel on tuning for Atom:

  https://software.intel.com/en-us/blogs/2013/05/28/why-should-i-update-gcc-x86-compiler-or-gcc-compiler-performance-on-intel-atom-from

I didn't do my own benchmarks so maybe that flag doesn't help much,
but it didn't cause a build failure with gcc 4.9.x.

>>
>> ( ie the default flags set by tune-core2.inc with one additional flag:
>> -fschedule-insns )
>>
>> Problem is only seen with gcc 5.2
>>
>> Compiler error is:
>>
>> i686-rdk-linux-gcc -m32 -march=core2 -mtune=core2 -msse3 -mfpmath=sse
>> -fschedule-insns
>> --sysroot=/home/andre/rdk/rdk-master/build-vbox32/tmp/sysroots/vbox32
>> -O2 -pipe -g -feliminate-unused-debug-types -fstack-protector-strong
>> -D_FORTIFY_SOURCE=2 -MT zlib/deflate.o -MD -Os -march=i386
>> -falign-functions=0 -falign-jumps=0 -falign-labels=0 -ffast-math
>> -fomit-frame-pointer -std=gnu99 -m32 -mpreferred-stack-boundary=2
>> -fno-stack-protector -fwrapv -freg-struct-return -fPIC -fno-exceptions
>> -fno-asynchronous-unwind-tables -fno-strict-aliasing
>> -falign-functions=0 -falign-jumps=0 -falign-labels=0 -falign-loops=0
>> -g -D__COM32__ -D__FIRMWARE_BIOS__ -nostdinc -iwithprefix include -I.
>> -I/home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/lib/sys
>> -I/home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/lib/../include
>> -I/home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/include/sys
>> -I/home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/core/include
>> -I/home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/lib/
>> -I/home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/lib/sys/module
>> -I/home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/bios/com32/lib//../..
>> -W -Wall -Wstrict-prototypes -Wpointer-arith -Wwrite-strings
>> -Wstrict-prototypes -Winline -DDYNAMIC_CRC_TABLE -DPNG_NO_CONSOLE_IO
>> -DPNG_NO_WRITE_SUPPORTED -DPNG_NO_MNG_FEATURES -DPNG_NO_READ_tIME
>> -DPNG_NO_WRITE_tIME -mregparm=3 -DREGPARM=3 -c -o zlib/deflate.o
>> /home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/lib/zlib/deflate.c
>>
>> /home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/lib/zlib/deflate.c:
>> In function 'deflate':
>> /home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/lib/zlib/deflate.c:892:1:
>> error: unable to find a register to spill
>> }
>> ^
>> /home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/lib/zlib/deflate.c:892:1:
>> error: this is the insn:
>> (insn 745 1859 1860 94 (set (reg:QI 995)
>>        (mem/j:QI (plus:SI (reg/v/f:SI 965 [orig:676 strm ] [676])
>>                (const_int 48 [0x30])) [0 strm_54(D)->adler+0 S1
>> A32])) /home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/lib/zlib/deflate.c:775
>> 86 {*movqi_internal}
>>     (nil))
>> /home/andre/rdk/rdk-master/build-vbox32/tmp/work/core2-32-rdk-linux/syslinux/6.03-r0/syslinux-6.03/com32/lib/zlib/deflate.c:892:
>> confused by earlier errors, bailing out
>> --
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