[ACTIVITY] Week 22

[Prathamesh Kulkarni]

== This week ==

* TCWG-619 (4/10)
- Chromium builds with LTO single-partition with gold by changing
arm_is_long_call_p() to always return true, thereby disabling short
calls.

- Fails to build with ld.bfd for single partiition with the following error:
obj/third_party/webrtc/base/rtc_base.ipaddress.o: In function
`rtc::IPAddress::IPAddress(unsigned int)':
ipaddress.cc:(.text._ZN3rtc9IPAddressC2Ej[_ZN3rtc9IPAddressC5Ej]+0x28):
undefined reference to `vtable for rtc::IPAddress'

- gas debug for "Thumb2 branch out of range" in config/tc-arm.c:
Fails in md_apply_fix at following condition:
if ((value & ~0x3fffff) && ((value & ~0x3fffff) != ~0x3fffff))
{
if (!(ARM_CPU_HAS_FEATURE (cpu_variant, arm_arch_t2)))
as_bad_where (fixP->fx_file, fixP->fx_line, BAD_RANGE);
else if ((value & ~0x1ffffff)
&& ((value & ~0x1ffffff) != ~0x1ffffff))
as_bad_where (fixP->fx_file, fixP->fx_line,
_("Thumb2 branch out of range"));
}

The condition became true for value == fffffda

Backtrace: http://pastebin.com/QZqbwNCy

Options passed to as: -march=armv7-a -march=armv7-a -mfloat-abi=hard
-mfloat-abi=hard -mfpu=neon -mfpu=neon -meabi=5

- Disabling the above condition results in:
arm-linux-gnueabihf-g++: internal compiler error: Killed (program lto1)

* PR49551 (2/10)
- Modified patch and retested on x86 and arm.
- Submitted patch upstream for review.

* Misc (4/10)
- Exams ended on Monday.
- College Annual day.

== Next Week ==
- Work towards getting the patch approved.
- Continue investigating "Thumb2 branch out of range" error.
- Begin with TCWG-777.
- Submit cfgloop.h flattening patch upstream.