[Bug bootstrap/94739] New: GCC won't build on CET enabled Linux OS

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94739

            Bug ID: 94739
           Summary: GCC won't build on CET enabled Linux OS
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

[hjl@gnu-tgl-1 build-x86_64-linux]$ readelf -n /bin/ld 2>&1|more

Displaying notes found in: .note.gnu.property
  Owner                Data size        Description
  GNU                  0x00000030       NT_GNU_PROPERTY_TYPE_0
      Properties: x86 feature: IBT, SHSTK
        x86 ISA used: CMOV, SSE, SSE2
        x86 feature used: x86, XMM

and I got

build-x86_64-linux/./gcc/liblto_plugin.so: indirect branch tracking isn't
enabled: Invalid argument
collect2: error: ld returned 1 exit status
make[7]: *** [Makefile:994: libgcc_s.so] Error 1

Since ld is CET enabled, dlopen failed on liblto_plugin.so since it isn't CET
enabled.  On CET enabled Linux OS, we need to always enable CET on
liblto_plugin.so.