[testsuite] PATCH: Check if -pg available

["H.J. Lu" <hjl.tools@gmail.com>]

On Mon, Jan 12, 2015 at 03:04:20PM -0700, Jeff Law wrote:
> On 01/12/15 14:51, Magnus Granberg wrote:
> >måndag 12 januari 2015 12.11.17 skrev  H.J. Lu:
> >>On Mon, Jan 12, 2015 at 12:03 PM, Jeff Law <law@redhat.com> wrote:
> >>>On 01/12/15 12:59, H.J. Lu wrote:
> >>>>I don't know if -pg will work PIE on any targets.  For Linux/x86
> >>>>the choices of crt1.o are
> >>>>
> >>>>%{!shared: %{pg|p|profile:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}
> >>>>
> >>>>-shared, -pg and -pie are mutually exclusive. Those crt1 files are
> >>>>only crt1 files provided by glibc.  You can't even try -pg -pie on
> >>>>Linux without changing glibc.
> >>>
> >>>You're totally missing the point.  What I care about is *why*.
> >>>
> >With -pg it use gcrt1.o object file and that file is not compile with -fPIC.
> >When you build a shared lib on x86_64 all the objects files need to be buiit
> >with -fPIC else you get a error like that one abow and it is the same problems
> >when you build bin with -fPIE and linke with -pie.
> >Glibc do not provide one that is compile with -fPIC
> Is there some reason why glibc could not provide gcrt1.o compiled with
> -fPIC?
> 
> 

Here is a patch to check if -pg is available.  If -pg doesn't link,
profiling isn't available.  OK for trunk?

Thanks.


H.J.
---
 gcc/testsuite/lib/target-supports.exp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 0ac9646..7c09399 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -546,6 +546,12 @@ proc check_profiling_available { test_what } {
 	    set profiling_available_saved 0
 	} else {
 	    set profiling_available_saved 1
+	    if { [check_no_compiler_messages_nocache profiling executable {
+		  int main() { return 0; } } "-pg"] } {
+		set profiling_available_saved 1
+	     } else {
+		set profiling_available_saved 0
+	    }
 	}
     }
 
-- 
1.9.3