Re: [PATCH] [gdb/testsuite] Fix _selftest_setup on ppc64le-linux

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

On 7/29/26 3:12 PM, Tom de Vries wrote:
> On ppc64le-linux, with gcc 7.5.0 and an O0 gdb build, I get:
> ...
> (gdb) run ...
>    ...
> Breakpoint 1, main (argc=12, argv=0x7fffffffea78) at .../gdb.c:30^M
> 30        gdb_assert (is_main_thread ());^M
> (gdb) PASS: gdb.gdb/python-helper.exp: run until breakpoint at main
> ...
> 
> But with an O2 gdb build, I run into:
> ...
> (gdb) run ...
>    ...
> Breakpoint 1, 0x000000001003b438 in main (argc=12, argv=0x7fffffffea78) at \
>    /space/vries/gdb/src/gdb/gdb.c:25
> 25      {
> (gdb) FAIL: gdb.gdb/python-helper.exp: run until breakpoint at main
> ...
> 
> The breakpoint is indeed set at address 0x1003b438:
> ...
> (gdb) break main^M
> Breakpoint 1 at 0x1003b438: file /space/vries/gdb/src/gdb/gdb.c, line 25.^M
> ...
> which is the local entry point:
> ...
> (gdb) disassemble main
> Dump of assembler code for function main(int, char**):
>     0x000000001003b430 <+0>:	lis     r2,4606
>     0x000000001003b434 <+4>:	addi    r2,r2,28416
>     0x000000001003b438 <+8>:	mflr    r0
> ...
> 
> And indeed, at that address, there's no "recommended breakpoint location":
> ...
> gdb.c:
> File name                Line number    Starting address    View    Stmt
> gdb.c                             25          0x1003b430               x
> gdb.c                             30          0x1003b454               x
> gdb.c                             37          0x1003b464               x
> ...
> 
> So gdb behaves as expected.
> 
> Fix this by updating the pass regexp to allow this type of gdb output.
> 
> This fixes both test-case gdb.gdb/python-helper.exp and gdb.gdb/selftest.exp.
> 

I've pushed this to trunk, then reproduced the same problem on 
gdb-18-branch, and applied the patch there.

Thanks,
- Tom

> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=34463
> ---
>   gdb/testsuite/lib/selftest-support.exp | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/gdb/testsuite/lib/selftest-support.exp b/gdb/testsuite/lib/selftest-support.exp
> index 8d402288c51..bcfa99e8f34 100644
> --- a/gdb/testsuite/lib/selftest-support.exp
> +++ b/gdb/testsuite/lib/selftest-support.exp
> @@ -163,7 +163,8 @@ proc _selftest_setup { } {
>   	[multi_line \
>   	     "Starting program: $re_hs" \
>   	     ".*" \
> -	     [string cat "Breakpoint $::decimal, $function $re_args at" \
> +	     [string cat \
> +		  "Breakpoint $::decimal,( $::hex in)? $function $re_args at" \
>   		  " ${re_hs}gdb.c:$re_hs"] \
>   	     ".*"]
>       set re_xfail \
> 
> base-commit: 46a7f5580ebb8c6e0712ff83fbdfba658944ea01