[pushed] Fix build failure in linux-osdata.c

[Simon Marchi]

Commit

  Use std::vector in linux_xfer_osdata_processgroups
  b129dcac882da87767cb863ad8b2572f90e9e5bc

broke the build with older gcc (at least 4.7 and 4.8):

In file included from /usr/include/c++/4.7/algorithm:63:0,
                 from /home/emaisin/src/binutils-gdb/gdb/nat/linux-osdata.c:40:
/usr/include/c++/4.7/bits/stl_algo.h: In instantiation of ‘_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pid_pgid_entry*, std::vector<pid_pgid_entry> >; _Tp = pid_pgid_entry]’:
/usr/include/c++/4.7/bits/stl_algo.h:2315:70:   required from ‘_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pid_pgid_entry*, std::vector<pid_pgid_entry> >]’
/usr/include/c++/4.7/bits/stl_algo.h:2347:54:   required from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pid_pgid_entry*, std::vector<pid_pgid_entry> >; _Size = long int]’
/usr/include/c++/4.7/bits/stl_algo.h:5483:4:   required from ‘void std::sort(_RAIter, _RAIter) [with _RAIter = __gnu_cxx::__normal_iterator<pid_pgid_entry*, std::vector<pid_pgid_entry> >]’
/home/emaisin/src/binutils-gdb/gdb/nat/linux-osdata.c:480:57:   required from here
/usr/include/c++/4.7/bits/stl_algo.h:2277:4: error: passing ‘const pid_pgid_entry’ as ‘this’ argument of ‘bool pid_pgid_entry::operator<(const pid_pgid_entry&)’ discards qualifiers [-fpermissive]

Making the operator< method const fixes it.

gdb/ChangeLog:

	* nat/linux-osdata.c (struct pid_pgid_entry) <operator<>: Make
	const.
---
 gdb/ChangeLog          | 5 +++++
 gdb/nat/linux-osdata.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index af22deb..25ae470 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2017-10-14  Simon Marchi  <simon.marchi@ericsson.com>
+
+	* nat/linux-osdata.c (struct pid_pgid_entry) <operator<>: Make
+	const.
+
 2017-10-14  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* target.h: Include tracepoint.h.
diff --git a/gdb/nat/linux-osdata.c b/gdb/nat/linux-osdata.c
index 5d1a7bd..0980c8d 100644
--- a/gdb/nat/linux-osdata.c
+++ b/gdb/nat/linux-osdata.c
@@ -407,7 +407,7 @@ struct pid_pgid_entry
     return pid == pgid;
   }
 
-  bool operator< (const pid_pgid_entry &other)
+  bool operator< (const pid_pgid_entry &other) const
   {
     /* Sort by PGID.  */
     if (this->pgid != other.pgid)
-- 
2.7.4