gdb/gdb-testsuite-ada-pie.patch

[gdb/testsuite] Compile ada hello world for skip_ada_tests

For openSUSE Leap 15.0 with gcc-PIE installed (which makes gcc create PIE
executables by default) we get:
...
FAIL: gdb.ada/O2_float_param.exp: compilation foo.adb
...

The problem is that while gcc-PIE affects gcc, it does not affect gnatlink,
so it links in the libgnat.a, rather than libgnat_pic.a.  [ This is
bsc#1115034. ]

[ Without gcc-PIE, we have a related problem: if we run ada tests with
--target_board=unix/-fPIE/-pie, which makes sure PIE executables are generated
for c/c++ test-cases, still we get non-PIE ada executables, because gnatmake
does not pass -pie to gnatlink.  And if gnatmake would pass -pie to gnatlink,
we'd run into the same FAIL as above because gnatlink does not use use
libgnat_pic.a when -pie is specified (this is PR gcc/87936).  So, in order to
have ada tests generate PIE executables, we need
--target_board=unix/-fPIE/-largs/-pie/-lgnat_pic/-margs, which will not work
with c/c++ test-cases.  ]

For now, we check whether we can compile an ada hello world, and if not,
generate an UNSUPPORTED in either skip_ada_tests or gdb_compile_ada, to
not have this problem result in ~200 FAILs.

gdb/testsuite/ChangeLog:

2020-11-06  Tom de Vries  <tdevries@suse.de>

	* lib/ada.exp (gdb_compile_ada): Call gdb_can_compile_ada.
	(gdb_can_compile_ada): New gdb_caching_proc.
	* lib/gdb.exp: Add load_lib ada.exp.
	(skip_ada_tests): Return 1 if !gdb_can_compile_ada.

---
 gdb/testsuite/lib/ada.exp | 31 +++++++++++++++++++++++++++++++
 gdb/testsuite/lib/gdb.exp |  6 ++++++
 2 files changed, 37 insertions(+)

diff --git a/gdb/testsuite/lib/ada.exp b/gdb/testsuite/lib/ada.exp
index 0ffc5957c8..8370ce5b9b 100644
--- a/gdb/testsuite/lib/ada.exp
+++ b/gdb/testsuite/lib/ada.exp
@@ -87,12 +87,43 @@ proc gdb_compile_ada_1 {source dest type options} {
 # compile was successful.
 
 proc gdb_compile_ada {source dest type options} {
+    if { [gdb_can_compile_ada] == 0 } {
+	global gdb_test_file_name
+	unsupported "$gdb_test_file_name"
+	return "Cannot compile ada"
+    }
     set result [gdb_compile_ada_1 $source $dest $type $options]
 
     gdb_compile_test $source $result
     return $result
 }
 
+gdb_caching_proc gdb_can_compile_ada {
+    set name "hello"
+    set dir "[pwd]/tmp-ada-hello-[pid]"
+    set src "$dir/$name.adb"
+    set dest "$dir/$name"
+
+    set code {
+	with Ada.Text_IO;
+
+	procedure Hello is
+	begin
+	  Ada.Text_IO.Put_Line("Hello, world!");
+	end Hello;
+    }
+
+    file mkdir $dir
+    gdb_produce_source $src $code
+    set res [gdb_compile_ada_1 $src $dest executable {debug}]
+    file delete -force $dir
+
+    if { $res != "" } {
+	return 0
+    }
+    return 1
+}
+
 # Like standard_testfile, but for Ada.  Historically the Ada tests
 # used a different naming convention from many of the other gdb tests,
 # and this difference was preserved during the conversion to
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 653f145c1c..a0f2961a75 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -84,6 +84,7 @@ load_lib cache.exp
 load_lib gdb-utils.exp
 load_lib memory.exp
 load_lib check-test-names.exp
+load_lib ada.exp
 
 global GDB
 
@@ -2093,6 +2094,11 @@ proc skip_fortran_tests {} {
 # Return a 1 if I don't even want to try to test ada.
 
 proc skip_ada_tests {} {
+    if { [gdb_can_compile_ada] == 0 } {
+	global gdb_test_file_name
+	unsupported "$gdb_test_file_name"
+	return 1
+    }
     return 0
 }