Guard declarations of 'sve_{vq,vl}_from_{vl,vq}' macros on Aarch64 (and unbreak build)
authorSergio Durigan Junior <sergiodj@redhat.com>
Tue, 5 Jun 2018 21:55:39 +0000 (17:55 -0400)
committerSergio Durigan Junior <sergiodj@redhat.com>
Wed, 6 Jun 2018 21:35:01 +0000 (17:35 -0400)
commite5a77256e8961294b3ea7d483124834311ca363b
tree56b7ac0759929c66ee27b479327873f46a867840
parenteb5c42e511321b51849735a6d2762941fd5d6520
Guard declarations of 'sve_{vq,vl}_from_{vl,vq}' macros on Aarch64 (and unbreak build)

Commit 122394f1476b1c925a281b15399119500c8231c1 ("Function for reading
the Aarch64 SVE vector length") has added macros to manipulate SVE
vector sizes based on Linux kernel sources, but did not guard them
with #ifndef's, which breaks the build when the system headers already
have these macros:

    CXX    aarch64-linux-nat.o
  In file included from ../../gdb/aarch64-tdep.h:25,
                   from ../../gdb/aarch64-linux-nat.c:30:
  ../../gdb/arch/aarch64.h:79: error: "sve_vq_from_vl" redefined [-Werror]
   #define sve_vq_from_vl(vl) ((vl) / 0x10)

  In file included from /usr/include/bits/sigcontext.h:30,
                   from /usr/include/signal.h:291,
                   from build-gnulib/import/signal.h:52,
                   from ../../gdb/linux-nat.h:23,
                   from ../../gdb/aarch64-linux-nat.c:26:
  /usr/include/asm/sigcontext.h:154: note: this is the location of the previous definition
   #define sve_vq_from_vl(vl) ((vl) / SVE_VQ_BYTES)

  In file included from ../../gdb/aarch64-tdep.h:25,
                   from ../../gdb/aarch64-linux-nat.c:30:
  ../../gdb/arch/aarch64.h:80: error: "sve_vl_from_vq" redefined [-Werror]
   #define sve_vl_from_vq(vq) ((vq) * 0x10)

  In file included from /usr/include/bits/sigcontext.h:30,
                   from /usr/include/signal.h:291,
                   from build-gnulib/import/signal.h:52,
                   from ../../gdb/linux-nat.h:23,
                   from ../../gdb/aarch64-linux-nat.c:26:
  /usr/include/asm/sigcontext.h:155: note: this is the location of the previous definition
   #define sve_vl_from_vq(vq) ((vq) * SVE_VQ_BYTES)

In order to fix this breakage, this commit guards the declaration of
the macros using #ifndef's.

gdb/ChangeLog:
2018-06-06  Sergio Durigan Junior  <sergiodj@redhat.com>

* arch/aarch64.h (sve_vg_from_vl): Guard with #ifndef.
(sve_vl_from_vg): Likewise.
(sve_vq_from_vl): Likewise.
(sve_vl_from_vq): Likewise.
(sve_vq_from_vg): Likewise.
(sve_vg_from_vq): Likewise.
gdb/arch/aarch64.h