Re: [PATCH][2/2] early LTO debug, main part

[Szabolcs Nagy <szabolcs dot nagy at arm dot com>]

On 22/08/17 11:17, Richard Biener wrote:
> On Tue, 22 Aug 2017, Szabolcs Nagy wrote:
>> on aarch64_be-none-elf i see
>>
>> PASS->FAIL: gcc.dg/debug/pr41893-1.c -gdwarf-2 (test for excess errors)
>> PASS->FAIL: gcc.dg/debug/pr41893-1.c -gdwarf-2 -O (test for excess errors)
>> PASS->FAIL: gcc.dg/debug/pr41893-1.c -gdwarf-2 -O3 (test for excess errors)
>> PASS->FAIL: gcc.dg/debug/pr41893-1.c -gdwarf-2 -g1 (test for excess errors)
>> PASS->FAIL: gcc.dg/debug/pr41893-1.c -gdwarf-2 -g1 -O (test for excess errors)
>> PASS->FAIL: gcc.dg/debug/pr41893-1.c -gdwarf-2 -g1 -O3 (test for excess errors)
>> PASS->FAIL: gcc.dg/debug/pr41893-1.c -gdwarf-2 -g3 (test for excess errors)
>> PASS->FAIL: gcc.dg/debug/pr41893-1.c -gdwarf-2 -g3 -O (test for excess errors)
>> PASS->FAIL: gcc.dg/debug/pr41893-1.c -gdwarf-2 -g3 -O3 (test for excess errors)
>> PASS->FAIL: gcc.dg/lto/20090914-1 c_lto_20090914-1_0.o-c_lto_20090914-1_0.o link, -flto
>> PASS->FAIL: gcc.dg/lto/20100426 c_lto_20100426_0.o-c_lto_20100426_0.o link, -r -nostdlib -flto -g
>> PASS->FAIL: gcc.dg/lto/20111207-2 c_lto_20111207-2_0.o-c_lto_20111207-2_0.o link,  -g -O -flto
>> PASS->FAIL: gcc.dg/lto/20111213-1 c_lto_20111213-1_0.o-c_lto_20111213-1_0.o link,  -flto -g
>> PASS->FAIL: gcc.dg/lto/pr51572-1 c_lto_pr51572-1_0.o-c_lto_pr51572-1_0.o link,  -flto -g
>> PASS->FAIL: gcc.dg/lto/pr53470 c_lto_pr53470_0.o-c_lto_pr53470_0.o link,  -flto -g
>> PASS->FAIL: gcc.dg/lto/pr59323 c_lto_pr59323_0.o-c_lto_pr59323_0.o link,  -O2 -g -flto
>> PASS->FAIL: gcc.dg/lto/pr59323-2 c_lto_pr59323-2_0.o-c_lto_pr59323-2_0.o link,  -O2 -g -flto
>> PASS->FAIL: gcc.dg/pr43557-1.c (test for excess errors)
>>
>> linking seems to fail with
>>
>> /tmp/ccqAb1Wfdebugobjtem: file not recognized: Bad value
>> collect2: error: ld returned 1 exit status
>> lto-wrapper: fatal error: B/gcc/xgcc returned 1 exit status
>> compilation terminated.
>> P/aarch64_be-none-elf/bin/ld: error: lto-wrapper failed
>> collect2: error: ld returned 1 exit status
>> compiler exited with status 1
> 
> Can you file a bugreport please?  Can you investigate a bit, I suspect
> a simple int main() {} and ./xgcc -B. -flto -g t.c fails the same way.
> With -save-temps -v you should be able to inspect the generated
> debugobj with readelf.
> 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81925

i could not figure much out, readelf could parse lto1 input
but printed errors on the final link command input.

> Is this a native compiler or a cross-compiler?  [I suspect endianess
> issues somewhere?]

cross compiler (from aarch64-linux-gnu to aarch64_be-none-elf)