[Bug bootstrap/94998] New: GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[Bug bootstrap/94998] New: GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[harald at gigawatt dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

            Bug ID: 94998
           Summary: GCC 10 won't configure for host=x86, build!=host,
                    linker=bfd due to CET
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: harald at gigawatt dot nl
  Target Milestone: ---

Configuring libiberty fails when gcc is configured as

  ../gcc-10.1.0/configure --build=x86_64-forcecross-linux-gnu
--host=x86_64-pc-linux-gnu --enable-languages=c,c++ CC='gcc-10.1.0
-fuse-ld=bfd' CXX='g++-10.1.0 -fuse-ld=bfd'

(This is a shorter simplified configure line to make it easier to reproduce the
problem, not the one I was originally using. Please ignore the fact that it's
weird to trick the configure script into thinking it's cross-compiling when
it's not.)

It fails like so:

[...]
checking for CET support... configure: error: in
`/h/gcc-10.1.0-build/libiberty':
configure: error: cannot run test program while cross compiling
See `config.log' for more details
make[1]: *** [Makefile:7986: configure-libiberty] Error 1
make[1]: Leaving directory '/h/gcc-10.1.0-build'
make: *** [Makefile:955: all] Error 2

It works with gold because the linker options '-Wl,-z,ibt,-z,shstk' are not
accepted by gold (at least in binutils 2.34), so it never gets to the point
where it tries to run the test program.

[Bug target/94998] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[harald at gigawatt dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

Harald van Dijk <harald at gigawatt dot nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|bootstrap                   |target

--- Comment #1 from Harald van Dijk <harald at gigawatt dot nl> ---
(The bootstrap component is probably wrong if this only shows up in cross
compilations.)

[Bug target/94998] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |10.2
   Last reconfirmed|                            |2020-05-08
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |WAITING
           Assignee|unassigned at gcc dot gnu.org      |hjl.tools at gmail dot com

[Bug bootstrap/94998] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
          Component|target                      |bootstrap
               Host|                            |x86_64-linux

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ugh.

[Bug bootstrap/94998] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch
                URL|                            |https://gcc.gnu.org/piperma
                   |                            |il/gcc-patches/2020-May/545
                   |                            |392.html

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
A patch is posted at

https://gcc.gnu.org/pipermail/gcc-patches/2020-May/545392.html

[Bug bootstrap/94998] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[harald at gigawatt dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

--- Comment #4 from Harald van Dijk <harald at gigawatt dot nl> ---
Just confirming that that patch works for me, thanks.

[Bug bootstrap/94998] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@gcc.gnu.org>:

https://gcc.gnu.org/g:d17cdc17c90ce77cb90c569322c1f241d3530cec

commit r11-333-gd17cdc17c90ce77cb90c569322c1f241d3530cec
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue May 12 10:39:42 2020 -0700

    Enable CET in cross compiler if possible

    Don't perform CET run-time check for host when cross compiling.  Instead,
    enable CET in cross compiler if possible so that it will run on both CET
    and non-CET hosts.

    config/

            PR bootstrap/94998
            * cet.m4 (GCC_CET_HOST_FLAGS): Enable CET in cross compiler if
            possible.

    libiberty/

            PR bootstrap/94998
            * configure: Regenerated.

    lto-plugin/

            PR bootstrap/94998
            * configure: Regenerated.

[Bug bootstrap/94998] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed on master branch so far.

[Bug bootstrap/94998] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[slyfox at inbox dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

Sergei Trofimovich <slyfox at inbox dot ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |slyfox at inbox dot ru

--- Comment #7 from Sergei Trofimovich <slyfox at inbox dot ru> ---
*** Bug 95811 has been marked as a duplicate of this bug. ***

[Bug bootstrap/94998] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
HJ, can you please backport?

[Bug bootstrap/94998] [10 Regression] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by H.J. Lu <hjl@gcc.gnu.org>:

https://gcc.gnu.org/g:2c7ae01349f779f1d4e66d8831052ee59f9c948b

commit r10-8336-g2c7ae01349f779f1d4e66d8831052ee59f9c948b
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue May 12 10:39:42 2020 -0700

    Enable CET in cross compiler if possible

    Don't perform CET run-time check for host when cross compiling.  Instead,
    enable CET in cross compiler if possible so that it will run on both CET
    and non-CET hosts.

    config/

            PR bootstrap/94998
            * cet.m4 (GCC_CET_HOST_FLAGS): Enable CET in cross compiler if
            possible.

    libiberty/

            PR bootstrap/94998
            * configure: Regenerated.

    lto-plugin/

            PR bootstrap/94998
            * configure: Regenerated.

    (cherry picked from commit d17cdc17c90ce77cb90c569322c1f241d3530cec)

[Bug bootstrap/94998] [10 Regression] GCC 10 won't configure for host=x86, build!=host, linker=bfd due to CET

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94998

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 11 and GCC 10.2.