Re: [patch] libstdc++/70503 Ensure std::thread helpers have internal linkage

[Jonathan Wakely <jwakely at redhat dot com>]

On 07/04/16 15:27 +0200, Tom de Vries wrote:
> Hi,
>
> FYI, this testcase fails for me as follows:
> ...
> /usr/bin/ld: Dwarf Error: found dwarf version '4', this reader only 
> handles version 2 and 3 information.^M
> /tmp/ccMBMHB5.o: In function `main':^M
> 70503.cc:(.text.startup.main+0x5): undefined reference to 
> `execute_native_thread_routine'^M
> /usr/bin/ld: Dwarf Error: found dwarf version '0', this reader only 
> handles version 2 and 3 information.^M
> 70503.cc:(.text.startup.main+0xa): undefined reference to 
> `execute_native_thread_routine_compat'^M
> collect2: error: ld returned 1 exit status^M
> compiler exited with status 1
> output is:
> /usr/bin/ld: Dwarf Error: found dwarf version '4', this reader only 
> handles version 2 and 3 information.^M
> /tmp/ccMBMHB5.o: In function `main':^M
> 70503.cc:(.text.startup.main+0x5): undefined reference to 
> `execute_native_thread_routine'^M
> /usr/bin/ld: Dwarf Error: found dwarf version '0', this reader only 
> handles version 2 and 3 information.^M
> 70503.cc:(.text.startup.main+0xa): undefined reference to 
> `execute_native_thread_routine_compat'^M
> collect2: error: ld returned 1 exit status^M
>
> FAIL: 30_threads/thread/70503.cc  (test for errors, line 31)
> FAIL: 30_threads/thread/70503.cc  (test for errors, line 32)
> FAIL: 30_threads/thread/70503.cc (test for excess errors)

Hmm, I'm not sure whether it's better to use -gdwarf-2 or add
{ dg-prune-output "dwarf version" }