[Bug server/30199] New: cross compilation for arm64 fails

[Bug server/30199] New: cross compilation for arm64 fails

[mp3 at hello dot lv]

https://sourceware.org/bugzilla/show_bug.cgi?id=30199

            Bug ID: 30199
           Summary: cross compilation for arm64 fails
           Product: gdb
           Version: 13.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: server
          Assignee: unassigned at sourceware dot org
          Reporter: mp3 at hello dot lv
  Target Milestone: ---

Created attachment 14730
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14730&action=edit
Archived config.log, config.status and Makefile of gdbserver

I'm trying to cross compile using:
../../configure --prefix=/home/martinspuk/sources/aarch64-linux-musl/native
--host=aarch64-linux-musl --target=aarch64-linux-musl
make fails with:
make[2]: Entering directory
'/home/martinspuk/sources/gdb-13.1/build/arm64/gdbserver'
  CXX    linux-aarch64-low.o
../../../gdbserver/linux-aarch64-low.cc: In function 'void
aarch64_adjust_register_sets(const aarch64_features&)':
../../../gdbserver/linux-aarch64-low.cc:810:61: error: 'SVE_PT_REGS_SVE' was
not declared in this scope; did you mean 'SVE_SIG_REGS_SIZE'?
  810 |             regset->size = SVE_PT_SIZE (AARCH64_MAX_SVE_VQ,
SVE_PT_REGS_SVE);
      |                                                            
^~~~~~~~~~~~~~~
      |                                                            
SVE_SIG_REGS_SIZE
../../../gdbserver/linux-aarch64-low.cc:810:28: error: 'SVE_PT_SIZE' was not
declared in this scope
  810 |             regset->size = SVE_PT_SIZE (AARCH64_MAX_SVE_VQ,
SVE_PT_REGS_SVE);
      |                            ^~~~~~~~~~~
make[2]: *** [Makefile:545: linux-aarch64-low.o] Error 1

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[Bug server/30199] cross compilation for arm64 fails

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30199

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
This seems strange because at first glance these are defined
in gdb/nat/aarch64-sve-linux-sigcontext.h, which seems to
be included indirectly from linux-aarch64-low.cc.
Could you look into what's going on there?

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[Bug server/30199] cross compilation for arm64 fails

[mp3 at hello dot lv]

https://sourceware.org/bugzilla/show_bug.cgi?id=30199

--- Comment #2 from Mārtiņš Puķītis <mp3 at hello dot lv> ---
Hi Tom.
Thanks for helping. Somehow SVE_SIG_ZREGS_SIZE is defined and
./gdb/nat/aarch64-sve-linux-sigcontext.h doesn't get included from
./gdb/nat/aarch64-sve-linux-ptrace.h.

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[Bug server/30199] cross compilation for arm64 fails

[mp3 at hello dot lv]

https://sourceware.org/bugzilla/show_bug.cgi?id=30199

--- Comment #3 from Mārtiņš Puķītis <mp3 at hello dot lv> ---
SVE_SIG_ZREGS_SIZE is defined in toolchain file
/opt/buildroot-11/aarch64-linux-musl/include/bits/signal.h. Here's the full
path of includes:
In file included from /opt/buildroot-11/aarch64-linux-musl/include/signal.h:48,
                 from ../gnulib/import/signal.h:52,
                 from ../gnulib/import/sys/select.h:118,
                 from
/opt/buildroot-11/aarch64-linux-musl/include/sys/time.h:9,
                 from ../gnulib/import/sys/time.h:39,
                 from ../gnulib/import/sys/select.h:89,
                 from
/opt/buildroot-11/aarch64-linux-musl/include/sys/types.h:71,
                 from ../gnulib/import/sys/types.h:39,
                 from ../gnulib/import/stdio.h:58,
                 from ../../../gdbserver/../gdbsupport/common-defs.h:88,
                 from ../../../gdbserver/server.h:22,
                 from ../../../gdbserver/linux-aarch64-low.cc:22:
/opt/buildroot-11/aarch64-linux-musl/include/bits/signal.h:74:2: warning:
#warning SVE_SIG_ZREGS_SIZE [-Wcpp]
   74 | #warning SVE_SIG_ZREGS_SIZE

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[Bug server/30199] cross compilation for arm64 fails

[mp3 at hello dot lv]

https://sourceware.org/bugzilla/show_bug.cgi?id=30199

--- Comment #4 from Mārtiņš Puķītis <mp3 at hello dot lv> ---
SVE_PT_REGS_SVE isn't defined anywhere in the toolchain.

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[Bug server/30199] cross compilation for arm64 fails

[luis.machado at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30199

Luis Machado <luis.machado at arm dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |luis.machado at arm dot com
   Last reconfirmed|                            |2023-03-13
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |WAITING

--- Comment #5 from Luis Machado <luis.machado at arm dot com> ---
Hi,

What are the specs of the toolchain you're using. I've cross-built aarch64
before, but did not run into this.

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[Bug server/30199] cross compilation for arm64 fails

[luis.machado at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30199

--- Comment #6 from Luis Machado <luis.machado at arm dot com> ---
These definitions come from the Linux Kernel headers. Supposedly glibc picks
them up and duplicates them. Is it possible that musl has a slightly
out-of-sync version of the headers?

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[Bug server/30199] cross compilation for arm64 fails

[mp3 at hello dot lv]

https://sourceware.org/bugzilla/show_bug.cgi?id=30199

--- Comment #7 from Mārtiņš Puķītis <mp3 at hello dot lv> ---
Hi Luis.
I don't know the specs of toolchain. It seems to be some version of buildroot.
I was able to cross compile by commenting out #ifndef SVE_SIG_ZREGS_SIZE so
that aarch64-sve-linux-sigcontext.h gets included.

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[Bug server/30199] cross compilation for arm64 fails

[luis.machado at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30199

Luis Machado <luis.machado at arm dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #8 from Luis Machado <luis.machado at arm dot com> ---
That's good to know. But I suspect the right solution is to have the proper
headers for musl. Might be worth opening a ticket against musl to get those
headers adjusted.

I'll close this ticket, but feel free to reopen it if you see something else
off that might need investigation.

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