[Bug sanitizer/80953] Support libsanitizer on Solaris

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80953

--- Comment #33 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> I found that enabling it causes quite a number of regressions.  Here's
> the list that I've just recreated:
> 
> +FAIL: c-c++-common/asan/heap-overflow-1.c   -O0  output pattern test
> +FAIL: c-c++-common/asan/heap-overflow-1.c   -O1  output pattern test
> +FAIL: c-c++-common/asan/heap-overflow-1.c   -O2  output pattern test
> +FAIL: c-c++-common/asan/heap-overflow-1.c   -O2 -flto  output pattern test
> +FAIL: c-c++-common/asan/heap-overflow-1.c   -O2 -flto -flto-partition=none 
> output pattern test
> +FAIL: c-c++-common/asan/heap-overflow-1.c   -O3 -g  output pattern test
> +FAIL: c-c++-common/asan/heap-overflow-1.c   -Os  output pattern test
> 
> +FAIL: c-c++-common/asan/pr70541.c   -O0  output pattern test
> 
> +FAIL: c-c++-common/asan/strncpy-overflow-1.c   -O0  output pattern test
> +FAIL: c-c++-common/asan/strncpy-overflow-1.c   -O1  output pattern test
> +FAIL: c-c++-common/asan/strncpy-overflow-1.c   -O2  output pattern test
> +FAIL: c-c++-common/asan/strncpy-overflow-1.c   -O2 -flto  output pattern
> test
> +FAIL: c-c++-common/asan/strncpy-overflow-1.c   -O2 -flto
> -flto-partition=none  output pattern test
> +FAIL: c-c++-common/asan/strncpy-overflow-1.c   -O3 -g  output pattern test
> +FAIL: c-c++-common/asan/strncpy-overflow-1.c   -Os  output pattern test
> +FAIL: c-c++-common/asan/use-after-free-1.c   -O0  output pattern test
> +FAIL: c-c++-common/asan/use-after-free-1.c   -O1  output pattern test
> +FAIL: c-c++-common/asan/use-after-free-1.c   -O2  output pattern test
> +FAIL: c-c++-common/asan/use-after-free-1.c   -O2 -flto  output pattern test
> +FAIL: c-c++-common/asan/use-after-free-1.c   -O2 -flto -flto-partition=none
> output pattern test
> +FAIL: c-c++-common/asan/use-after-free-1.c   -O3 -g  output pattern test
> +FAIL: c-c++-common/asan/use-after-free-1.c   -Os  output pattern test
> +FAIL: g++.dg/asan/deep-stack-uaf-1.C   -O0  output pattern test
> 
> Maybe this goes away with your unwinding fix, though.

OK, that was a second unwinding issue, now fixed too.

Can you remind me of the issue in 64-bit mode?  Inconvenient memory layout,
right?  It seems to be present on Linux as well.