[Bug lto/95677] New: undefined reference to `(anonymous namespace)::xx'

[sujian.liu at huawei dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95677

            Bug ID: 95677
           Summary: undefined reference to `(anonymous namespace)::xx'
           Product: gcc
           Version: lto
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sujian.liu at huawei dot com
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

Created attachment 48731
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48731&action=edit
dejagnu/testsuite-7.3/g++.old-deja/g++.ns/extern1.C

When compile with lto,it will be reported the following error:

./riscv32-unknown-elf-gcc dejagnu/testsuite-7.3/g++.old-deja/g++.ns/extern1.C
-o extern1.exe -flto
                                                  
/home/lsj/gits/gcc_10_1_0/build/hcc_riscv32/riscv32_elf_build_dir/hcc_riscv32/bin/../lib/gcc/riscv32-unknown-elf/10.1.0/../../../../riscv32-unknown-elf/bin/ld:
/tmp/extern1.exe.m1gfd6.ltrans0.ltrans.o: in function `.L0 ':
<artificial>:(.text+0x6): undefined reference to `(anonymous namespace)::xx'
/home/lsj/gits/gcc_10_1_0/build/hcc_riscv32/riscv32_elf_build_dir/hcc_riscv32/bin/../lib/gcc/riscv32-unknown-elf/10.1.0/../../../../riscv32-unknown-elf/bin/ld:
<artificial>:(.text+0xa): undefined reference to `(anonymous namespace)::xx'
collect2: error: ld returned 1 exit status

It seems that lto can't deal with the extern variable in the namespace.

The testcase which is one of deja in testsuite-7.3 will be attached.