[committed][gdb/testsuite] Fix .debug_aranges in gdb.dlang/watch-loc.c

[Tom de Vries <tdevries@suse.de>]

Hi,

While investigating PR25862 (an assertion failure with target board
cc-with-debug-names), I noticed that the .debug_aranges section in
gdb.dlang/watch-loc.c contains a hardcoded 0x1000:
...
"      .4byte  _Dmain \n"      // Address
"      .4byte  0x1000 \n"      // Length
...

Fix this by using the actual length of _Dmain, along the lines of how that
is done in gdb.mi/dw2-ref-missing-frame-func.c:
...
"      .4byte  _Dmain_end - _Dmain \n" // Length
...
such that the .debug_aranges entry:
...
    Address    Length
    004004a7 0000000b
    00000000 00000000
...
matches the addresses found in the corresponding CU:
...
 <2><fd>: Abbrev Number: 6 (DW_TAG_subprogram)
    <fe>   DW_AT_name        : _Dmain
    <105>   DW_AT_low_pc      : 0x4004a7
    <10d>   DW_AT_high_pc     : 0x4004b2
...

With this fix the assertion failure is no longer triggered for
gdb.dlang/watch-loc.exp.

Tested on x86_64-linux.

Committed to trunk.

Thanks,
- Tom

[gdb/testsuite] Fix .debug_aranges in gdb.dlang/watch-loc.c

gdb/testsuite/ChangeLog:

2020-04-22  Tom de Vries  <tdevries@suse.de>

	* gdb.dlang/watch-loc.c (.debug_aranges): Fix _Dmain length.

---
 gdb/testsuite/gdb.dlang/watch-loc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.dlang/watch-loc.c b/gdb/testsuite/gdb.dlang/watch-loc.c
index c3159ce1079..de594f35ae6 100644
--- a/gdb/testsuite/gdb.dlang/watch-loc.c
+++ b/gdb/testsuite/gdb.dlang/watch-loc.c
@@ -28,6 +28,8 @@ int _Dmain (void)
   return 0;
 }
 
+asm ("_Dmain_end: .globl _Dmain_end");
+
 int
 main (void)
 {
@@ -51,7 +53,7 @@ asm (
 "	.2byte	0 \n"	// Pad to 16 byte boundary
 "	.2byte	0 \n"
 "	.4byte	_Dmain \n"	// Address
-"	.4byte	0x1000 \n"	// Length
+"	.4byte	_Dmain_end - _Dmain \n"	// Length
 "	.4byte	0 \n"
 "	.4byte	0 \n"
 ".Laranges_end: \n"