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amd64-linux-siginfo.c: Adjust include order to avoid gnulib error

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On Fedora rawhide, after updating to glibc-2.33, I'm seeing the
following build failure:

  CXX    nat/amd64-linux-siginfo.o
In file included from /usr/include/bits/sigstksz.h:24,
                 from /usr/include/signal.h:315,
                 from ../gnulib/import/signal.h:52,
                 from /ironwood1/sourceware-git/rawhide-gnulib/bld/../../worktree-gnulib/gdbserver/../gdb/nat/amd64-linux-siginfo.c:20:
../gnulib/import/unistd.h:663:3: error: #error "Please include config.h first."
  663 |  #error "Please include config.h first."
      |   ^~~~~

glibc-2.33 has changed signal.h to now include <bits/sigstksz.h> which,
in turn, includes <unistd.h>. For a gdb build, this causes the gnulib
version of unistd.h to be pulled in first.  The build failure shown
above happens because gnulib's config.h has not been included before
the include of <signal.h>.

The fix is simple - we just rearrange the order of the header file
includes to make sure that gdbsupport/commondefs.h is included before
attempting to include signal.h.  Note that gdbsupport/commondefs.h
includes <gnulib/config.h>.

Build and regression tested on Fedora 33.  On Fedora rawhide, GDB
builds again.

gdb/ChangeLog:

	* nat/amd64-linux-siginfo.c: Include "gdbsupport/common-defs.h"
	(which in turn includes <gnulib/config.h>) before include
	of <signal.h>.
This commit is contained in:
Kevin Buettner 2021-02-18 22:46:58 -07:00
parent 5a9f5403c7
commit 8488c357ce
2 changed files with 7 additions and 1 deletions
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6
gdb/ChangeLog
View File

@ -1,3 +1,9 @@
2021-02-19 Kevin Buettner <kevinb@redhat.com>
* nat/amd64-linux-siginfo.c: Include "gdbsupport/common-defs.h"
(which in turn includes <gnulib/config.h>) before include
of <signal.h>.
2021-02-19 Nelson Chu <nelson.chu@sifive.com>
PR 27158

2
gdb/nat/amd64-linux-siginfo.c
View File

@ -17,8 +17,8 @@
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <signal.h>
#include "gdbsupport/common-defs.h"
#include <signal.h>
#include "amd64-linux-siginfo.h"
#define GDB_SI_SIZE 128