[Bug c/85870] [6/7/8/9 Regression][LTO1] ICE in linemap_line_start, at libcpp/line-map.c:794

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85870

--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Ramana Radhakrishnan from comment #4)
> (In reply to Martin Liška from comment #3)
> > Can't reproduce with GCC 7.3.0 on x86_64:
> > 
> > + gcc-7 -O2 -flto -c test_1.i -o test_1.o
> > + gcc-7 -O2 -flto -c test_2.i -o test_2.o
> > + gcc-7 test_1.o test_2.o
> > /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld:
> > /usr/lib64/gcc/x86_64-suse-linux/7/../../../../lib64/crt1.o: in function
> > `_start':
> > /home/abuild/rpmbuild/BUILD/glibc-2.27/csu/../sysdeps/x86_64/start.S:104:
> > undefined reference to `main'
> > collect2: error: ld returned 1 exit status
> > 
> > Richi how did you achieve to reproduce that?
> 
> It's still failing on aarch64-none-linux-gnu. So that doesn't mean this goes
> waiting.

Native or cross compiler? Because cross compiler works fine for me:

$ aarch64-suse-linux-g++-8 -c test_1.i -c -flto
$ aarch64-suse-linux-g++-8 -c test_2.i -c -flto
$ /usr/lib64/gcc/aarch64-suse-linux/8/lto1 test_1.o test_2.o
Reading object files: test_1.o test_2.o {GC start 1697k} 
Reading the callgraph
Merging declarations
Reading summaries
Reading function bodies:
Performing interprocedural optimizations
 <whole-program> <profile_estimate> <icf> <devirt> <cp> <cdtor> <fnsummary>
<inline> <pure-const> <free-fnsummary> <static-var> <single-use>
<comdats>Assembling functions:
 <materialize-all-clones> init_xyz_0 init_xyz_1
Time variable                                   usr           sys          wall
              GGC
 phase setup                        :   0.00 (  0%)   0.00 (  0%)   0.00 (  0%)
   1847 kB (  1%)
 phase opt and generate             :   2.11 (100%)   0.12 ( 92%)   2.23 (100%)
 188629 kB ( 99%)
 phase finalize                     :   0.00 (  0%)   0.01 (  8%)   0.01 (  0%)
      0 kB (  0%)
 lto stream inflate                 :   0.12 (  6%)   0.03 ( 23%)   0.15 (  7%)
      0 kB (  0%)
 ipa lto constructors in            :   0.65 ( 31%)   0.03 ( 23%)   0.69 ( 31%)
 188513 kB ( 99%)
 TOTAL                              :   2.11          0.13          2.24       
 190523 kB