Breaking in a c++ method with current language set to c.

[Pedro Alves]

Hi all,

I got a fail in gdb.cp/psmang.exp while debugging gdbserver, related to the fact
that I have debug info in my c startup files, which in turn made me have the
current language set to c.  The test tried to do a break like,

break A::method

, which failed, because the current way of finding struct/union methods doesn't
take into account the language of A.  When we get to linespec.c:find_method, if
we know that A is a c++ class, we know that 'method' is a c++ method.

I've looked at several ways to fix it, and all but this one turned out more
invasive than I hoped for, because current_language is used in a several places
(in symtab.c).  Instead, I simply wrapped linespec.c:find_method with a
set_language (lang of A), guarded with a cleanup.

With class A from the new testcase in the patch,

before:
(gdb) set lang c
(gdb) b A::method
the class A does not have any method named method
Hint: try 'A::method<TAB> or 'A::method<ESC-?>
(Note leading single quote.)

after:
(gdb) set lang c
[0] cancel
[1] all
[2] A::method(A*) at main.cc:17
[3] A::method(int) at main.cc:12
[4] A::method() at main.cc:7


Tested on i686-pc-cygwin,

OK?

Cheers,
Pedro Alves
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