Hi-
It seems that there is some discrepancy between Linaro GCC 4.8 2015.06 and Linaro GCC 4.8 2014.11 with regards to precompiled headers.
It appears that 2015.06 doesn't even attempt to open the precompiled headers according to strace. I have been looking on gcc mailing list but have not been able to find any fixes related to precompiled headers.
Does anyone have any pointers as to what should I be looking at to get to the bottom of this issue?
This simple program compiles without any problems on 2014.11, but fails on 2015.06 because 2015.06 doesn't even attempt to read tst.h.gch created by "make header"
dragans@tst:~$ cat Makefile
PROJ=tst
CC=arm-linux-gcc
LD=arm-linux-ld
all: header $(PROJ)
header: $(PROJ)._
cp $(PROJ)._ $(PROJ).h
$(CC) -x c-header -c $(PROJ).h
$(PROJ):
$(RM) $(PROJ).h
$(CC) $(PROJ).c -o $(PROJ)
clean:
$(RM) $(PROJ).h.gch $(PROJ).h $(PROJ)
dragans@tst:~$ cat tst._
#include <stdio.h>
dragans@tst:~$ cat tst.c
#include "tst.h"
int main(int argc, char**argv)
{
char *s = "Test";
printf("%s\n", s);
return 0;
}
== Progress ==
LLDB development
-- Testing and bug fixing lldb on hikey AArch64 [TCWG-886] [7/10]
-- Improve error handling of AArch64 watchpoint code. Submitted,
got reviewed and committed http://reviews.llvm.org/D12328
-- Looked into ways to improve watchpoint installation lag.
-- Looked into issues pertaining to un-alligned watchpoints installation.
-- Committed upstream arm hardware breakpoint and watchpoint support
[TCWG-770] [TCWG-794] [1/10]
-- Ran lldb testsuite in various combinations to figure out Arm and
AArch64 status [1/10]
-- Testing on chromebook with precise chroot works.
Miscellaneous [1/10]
-- Meetings, emails, discussions etc.
== Plan ==
LLDB development
-- Try to find ways to debug lldb-server platform forked gdbserver instance.
-- Test, debug and fix testsuite failures on Arm and AArch64.
== Progress ==
LLDB development
-- Testing and bug fixing lldb on hikey AArch64 [TCWG-886] [2/10]
-- Looked into watchpoint tests which are still failing after
committing watchpoint support and bug fixes.
-- Modifications to arm hardware breakpoint and watchpoint support
[TCWG-770] [TCWG-794] [7/10]
-- Resubmitted the pending patch http://reviews.llvm.org/D9703
-- Testing on chromebook with precise chroot works.
Miscellaneous [1/10]
-- Meetings, emails, discussions etc.
-- Looking into slow data transfer issues on chromebook and highkey board
== Plan ==
LLDB development
-- Get patches reviewed and committ them.
-- Continue looking into tests which are still failing on Arm and AArch64
-- Run test comparison between linux x86, android arm and linux arm
o 3 days off (6/10)
== Progress ==
o Linaro GCC validation (3/10)
* Reviewed, validated and committed on-going backports
* backported more revisions
o Misc (1/10)
* Various meetings
== Plan ==
o Continue backports/validation
== Progress ==
* Annual Leave (2/10)
* Widening pass (TCWG-547) - 6/10
- Fixed all execution test failure.
- bootstrap failure due to “Drop copy-rename” is still not resolved.
Found a workaround.
- Sorted debug_stmt handling
* TACT 1/10
- Started looking to cross execution set-up
* Misc - 1/10
- gcc-patches, gcc-bugs list
== Plan ==
* Continue with widening pass
== This Week ==
* TCWG-777 (3/10)
- Fixed ICE with the patch - toolchain builds with the patch.
- Sent patch to tcwg list for review
- Investigating why combine fails to combine
arm_andsi3_insn/arm_cmpsi_insn into zeroextractsi_compare0_scratch
when the pass uses ud-chains to find def but works
when def is found using ad-hoc way.
* TCWG-871 (4/10)
- Getting familiar with firefox build system
- LTO build lto/non-lto on x86 and arm (doc)
- Figuring out how to resolve "plugin needed to handle lto object" error.
tried the following:
binutils configured with: --enable-plugin, --enable-lto
gcc configured with: --enable-lto --with-ld-plugin=<just built ld>
Doesn't appear to work.
* TCWG-835 (1/10)
- Build failure with spec (PR67399)
* Misc (2/10)
- Meetings
- Looked at rtl dataflow (df.h and df*.c) and ree.c
== Next Week ==
Continue with TCWG-777, TCWG-835, TCWG-871
== This week ==
* TCWG-832 -Exploit vector multiply by scalar instructions when multiple
scalars are used as
coefficients in a loop (2/10)
- Initial investigation.
* TCWG-833 - Exploit Wide Add operations when appropriate (4/10)
- Ramana is reviewing Aarch32 patch
- Recoded Aarch64 support to use vect_select
- Debugging Aarch64 lto, tree-dump regression suite failures
* TCWG-834 - Use non-unit stride loads by preference when applicable (1/10)
- TCWG 834 is Bugzilla 67323 upstream; Richard Biener took ownership
as a vectorizer failure
- My plan was to write a test case that failed until fixed, but
Richard indicated this is not
standard practice
- Bugzilla 57195 (mode iterator bug) blocked compiling new pattern (1/10)
- Separated patch from Bugzilla 67321 patch and sent upstream
- Pinged upstream for comments
- Bugzilla 67320 - Incorrect standard names for wide addition (1/10)
- committed upstream in trunk
* Misc (1/10)
- Conference calls
== Next week ==
- Resolve Aarch64 TCWG-833 patch, validate and upstream
- Additional investigation into TCWG-832
# Progress #
* TCWG-857 [3/10]
With one kernel fix, HW breakpoint works for unaligned address
(2-byte aligned).
Debug linux kernel with KGDB. KGDB exposes an existing GDB bug, I
fixed it, but need some time thinking about how to submit it upstream.
* TCWG-567, arm watchpoint fixes [4/10]. All fails are fixed, but need
another round of test to confirm. ARM HW watchpoint doesn't work on
4.0.0 kernel, but I don't investigate on it.
* TCWG-757 [2/10], some patches review.
* Misc, meeting, [1/10]
# Plan #
* TCWG-857.
* Upstream the leftover of aarch64 multi-arch patches.
--
Yao
