On 07/29/2018 02:40 AM, Bin Meng wrote:
Hi Heinrich,
On Sat, Jul 28, 2018 at 11:42 PM, Heinrich Schuchardt xypron.glpk@gmx.de wrote:
Debian Buster has upgraded gcc to version 8.1.
Do you know any pre-built gcc 8.1 that can be used on other distributions than Debian Buster, so that I can take a look? I am currently on Ubuntu 16.04.
Ubuntu Cosmic has gcc 8.2. Setting up a virtual machine with virt-manager is quite easy.
With gcc 8.1 I get an error when trying to build qemu-x86_defconfig
{standard input}: Assembler messages: {standard input}:7465: Error: junk at end of line, first unrecognized character is `@'
The problematic line in the generated assembler code is
.long end.6133@gotoff-start.6130@gotoff
This difference relates to the length of a linker generated list and is only needed for debugging. It is not generated when compiling without option -g.
Without '-g', does gcc 8.1 build?
Yes, if I remove the lines setting -g in /Makefile I have no build problem.
Compilation on x86 works fine with gcc 7.3. gcc 7.3 simply does not generate the line at all.
Does gcc 8.1 on Debin Buster come with multilib support? I vaguely remember old version did not which would cause build error.
There is also a gcc-multilib package with version 8.1 in Debian Buster.
Best regards
Heinrich
To generate the complete assembler code use gcc with options -S -fverbose-asm.
Regards, Bin