[RFA/testsuite] Suppress errors building thread tests

[Daniel Jacobowitz <drow at mvista dot com>]

This patch suppresses the compiler/linker's error messages when we're
probing for a threads library, by adding a "quiet" option to gdb_compile.
Tested i386-linux, no surprises, and no noise.  I also convert the other
copies of gdb_compile_pthreads into users of the copy in gdb.exp.

Note the use of gdb_suppress_entire_file.  I'm just doing that because it's
what the other tests do; I really dislike gdb_suppress_entire_file, so I
think I may send along a followup patch to change it to a "return -1". 
gdb_compile_pthreads already does an "unsupported" if compilation fails. If
we can't build the threads tests, there's no point in FAILing them, in my
opinion; this clutters up results when I run simulator testing.  Thoughts?

Is this OK?

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

2002-12-31  Daniel Jacobowitz  <drow@mvista.com>

	Fix PR gdb/844
	* lib/gdb.exp (gdb_compile): Handle "quiet" option.
	(gdb_compile_pthreads): Pass "quiet" to gdb_compile.

	* gdb.threads/gcore-thread.exp: Use gdb_compile_pthreads.
	* gdb.threads/print-threads.exp: Likewise.
	* gdb.threads/schedlock.exp: Likewise.

Index: testsuite/gdb.threads/gcore-thread.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.threads/gcore-thread.exp,v
retrieving revision 1.1
diff -u -p -r1.1 gcore-thread.exp
--- testsuite/gdb.threads/gcore-thread.exp	9 Jan 2002 00:37:41 -0000	1.1
+++ testsuite/gdb.threads/gcore-thread.exp	31 Dec 2002 15:56:06 -0000
@@ -32,39 +32,14 @@ set testfile "pthreads"
 set srcfile  ${testfile}.c
 set binfile  ${objdir}/${subdir}/${testfile}
 
-set built_binfile 0
 if [istarget "*-*-linux"] then {
     set target_cflags "-D_MIT_POSIX_THREADS"
 } else {
     set target_cflags ""
 }
-set why_msg "unrecognized error"
-foreach lib {-lpthreads -lpthread -lthread} {
-    set options "debug"
-    lappend options "incdir=${objdir}/${subdir}"
-    lappend options "libs=$lib"
-    set ccout [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable $options]
-    switch -regexp -- $ccout {
-	".*no posix threads support.*" {
-	    set why_msg "missing threads include file"
-	    break
-	}
-	".*cannot open -lpthread.*" {
-	    set why_msg "missing runtime threads library"
-	}
-	".*Can't find library for -lpthread.*" {
-	    set why_msg "missing runtime threads library"
-	}
-	{^$} {
-	    pass "successfully compiled posix threads test case"
-	    set built_binfile 1
-	    break
-	}
-    }
-}
-if {$built_binfile == "0"} {
-    unsupported "Couldn't compile ${srcfile}, ${why_msg}"
-    return -1
+
+if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "incdir=${objdir}/${subdir}"]] != "" } {
+    gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
 }
 
 # Now we can proceed with the real testing.
Index: testsuite/gdb.threads/print-threads.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.threads/print-threads.exp,v
retrieving revision 1.1
diff -u -p -r1.1 print-threads.exp
--- testsuite/gdb.threads/print-threads.exp	23 Aug 2002 20:32:02 -0000	1.1
+++ testsuite/gdb.threads/print-threads.exp	31 Dec 2002 15:56:06 -0000
@@ -38,42 +38,8 @@ set binfile ${objdir}/${subdir}/${testfi
 # carriage return)
 set horiz "\[^\n\r\]*"
 
-set built_binfile 0
-
-# Default to the usual (only?) -lpthread on GNU/Linux to quiet noise
-if [istarget "*-*-linux*"] then {
-    set possible_libs "-lpthread -lpthreads -lthread"
-} else {
-    set possible_libs "-lpthreads -lpthread -lthread"
-}
-
-set why_msg "unrecognized error"
-foreach lib $possible_libs {
-    set options "debug"
-    lappend options "incdir=${objdir}/${subdir}"
-    lappend options "libs=$lib"
-    set ccout [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable $options]
-    switch -regexp -- $ccout {
-	".*no posix threads support.*" {
-	    set why_msg "missing threads include file"
-	    break
-	}
-	".*cannot open -lpthread.*" {
-	    set why_msg "missing runtime threads library"
-	}
-	".*Can't find library for -lpthread.*" {
-	    set why_msg "missing runtime threads library"
-	}
-	{^$} {
-	    pass "successfully compiled posix threads test case"
-	    set built_binfile 1
-	    break
-	}
-    }
-}
-if {$built_binfile == "0"} {
-    unsupported "Couldn't compile ${srcfile}, ${why_msg}"
-    return -1
+if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "incdir=${objdir}/${subdir}"]] != "" } {
+    gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
 }
 
 # Now we can proceed with the real testing.
Index: testsuite/gdb.threads/schedlock.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.threads/schedlock.exp,v
retrieving revision 1.1
diff -u -p -r1.1 schedlock.exp
--- testsuite/gdb.threads/schedlock.exp	23 Aug 2002 20:32:02 -0000	1.1
+++ testsuite/gdb.threads/schedlock.exp	31 Dec 2002 15:56:06 -0000
@@ -33,42 +33,8 @@ set testfile "schedlock"
 set srcfile ${testfile}.c
 set binfile ${objdir}/${subdir}/${testfile}
 
-set built_binfile 0
-
-# Default to the usual (only?) -lpthread on GNU/Linux to quiet noise
-if [istarget "*-*-linux*"] then {
-    set possible_libs "-lpthread -lpthreads -lthread"
-} else {
-    set possible_libs "-lpthreads -lpthread -lthread"
-}
-
-set why_msg "unrecognized error"
-foreach lib $possible_libs {
-    set options "debug"
-    lappend options "incdir=${objdir}/${subdir}"
-    lappend options "libs=$lib"
-    set ccout [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable $options]
-    switch -regexp -- $ccout {
-	".*no posix threads support.*" {
-	    set why_msg "missing threads include file"
-	    break
-	}
-	".*cannot open -lpthread.*" {
-	    set why_msg "missing runtime threads library"
-	}
-	".*Can't find library for -lpthread.*" {
-	    set why_msg "missing runtime threads library"
-	}
-	{^$} {
-	    pass "successfully compiled posix threads test case"
-	    set built_binfile 1
-	    break
-	}
-    }
-}
-if {$built_binfile == "0"} {
-    unsupported "Couldn't compile ${srcfile}, ${why_msg}"
-    return -1
+if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "incdir=${objdir}/${subdir}"]] != "" } {
+    gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
 }
 
 # Now we can proceed with the real testing.
Index: testsuite/lib/gdb.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/lib/gdb.exp,v
retrieving revision 1.30
diff -u -p -r1.30 gdb.exp
--- testsuite/lib/gdb.exp	16 Dec 2002 19:33:54 -0000	1.30
+++ testsuite/lib/gdb.exp	31 Dec 2002 15:56:06 -0000
@@ -1134,7 +1134,7 @@ proc gdb_compile {source dest type optio
     set result [target_compile $source $dest $type $options];
     regsub "\[\r\n\]*$" "$result" "" result;
     regsub "^\[\r\n\]*" "$result" "" result;
-    if { $result != "" } {
+    if { $result != "" && [lsearch $options quiet] == -1} {
 	clone_output "gdb compile failed, $result"
     }
     return $result;
@@ -1150,7 +1150,7 @@ proc gdb_compile_pthreads {source dest t
     foreach lib {-lpthreads -lpthread -lthread} {
         # This kind of wipes out whatever libs the caller may have
         # set.  Or maybe theirs will override ours.  How infelicitous.
-        set options_with_lib [concat $options [list libs=$lib]]
+        set options_with_lib [concat $options [list libs=$lib quiet]]
         set ccout [gdb_compile $source $dest $type $options_with_lib]
         switch -regexp -- $ccout {
             ".*no posix threads support.*" {