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Re: [PATCH] Make ftrace tests work with remote targets
- From: Simon Marchi <simon dot marchi at ericsson dot com>
- To: Pedro Alves <palves at redhat dot com>, <gdb-patches at sourceware dot org>
- Date: Mon, 4 Apr 2016 14:31:46 -0400
- Subject: Re: [PATCH] Make ftrace tests work with remote targets
- Authentication-results: sourceware.org; auth=none
- References: <1457040175-24438-1-git-send-email-simon dot marchi at ericsson dot com> <56FB05C9 dot 8050801 at redhat dot com> <56FD8762 dot 2030909 at ericsson dot com> <56FDB049 dot 9070405 at redhat dot com>
On 16-03-31 07:18 PM, Pedro Alves wrote:
> On 03/31/2016 09:24 PM, Simon Marchi wrote:
>> On 16-03-29 06:46 PM, Pedro Alves wrote:
>>> On 03/03/2016 09:22 PM, Simon Marchi wrote:
>>>> --- a/gdb/testsuite/lib/gdb.exp
>>>> +++ b/gdb/testsuite/lib/gdb.exp
>>>> @@ -3374,7 +3374,7 @@ proc gdb_compile {source dest type options} {
>>>> # dynamically load one by basename, we must specify rpath. If we
>>>> # are using a remote host, DejaGNU will link to the shared library
>>>> # using a relative path, so again we must specify an rpath.
>>>> - if { $shlib_load || ($shlib_found && [is_remote target]) } {
>>>> + if { $shlib_load || $shlib_found } {
>>>
>>> I think the comment above needs updating.
>>
>> What about:
>>
>> # Because we link with libraries using their basename, we may need
>> # (depending on the platform) to set a special rpath value, to allow
>> # the executable to find the libraries it depends on.
>
> That's great.
>
>>
>>>> lappend link_options "additional_flags=-Wl,--out-implib,${name}.a"
>>>> - } elseif [is_remote target] {
>>>> + } else {
>>>> # By default, we do not set the soname. This causes the linker
>>>
>>> Likewise.
>>
>> What about:
>>
>> # Set the soname of the library. This causes the linker on ELF
>> # systems to create the DT_NEEDED entry in the executable referring
>> # to the soname of the library, and not its absolute path. This
>> # (using the absolute path) would be problem when testing on a
>> # remote target.
>> #
>> # In conjunction with setting the soname, we add the special
>> # rpath=$ORIGIN value when building the executable, so that it's
>> # able to find the library in its own directory.
>
> Perfect.
>
>>
>>
>>>> proc gdb_load_shlibs { args } {
>>>> - if {![is_remote target]} {
>>>> - return
>>>> - }
>>>> + if {[is_remote target]} {
>>>> + foreach file $args {
>>>> + # When the target is remote, we simply send the file to the target.
>>>> + gdb_download [shlib_target_file $file]
>>>> + }
>>>> + } else {
>>>> + foreach from $args {
>>>> + # When the target is native, we copy the files to the test directory
>>>> + # (next to the executable), except if that's already where it is.
>>>> + set to [standard_output_file [file tail $from]]
>>>
>>> I'd think it better to make the gdb_download path work for native
>>> testing as well. WDYT? E.g., make shlib_target_file default to
>>> return the test directory path?
>>
>> If I understand correctly, gdb_download would take a local file path and take
>> care of transferring that file to the "runtime test directory", whether it's
>> local or remote.
>
> Right. I'm not sure whether it's the right level or not.
>
> If the target is local, it checks whether $src == $dest, and
>> copies the file if not. Basically, the same as my implementation of
>> gdb_load_shlibs, just not limited to shlibs.
>
> *nod*
>
> Now that I grep for gdb_download, sounds like we'll need to
> change mi_load_shlibs similarly. Not sure offhand why the jit*.so
> hits don't use gdb_load_shlibs instead or gdb_download
>
>>
>> I am not sure if "make shlib_target_file default to return the test directory path?"
>> would be ok. I think it's meant to return the local file path to download to the
>> target.
>
> You're right. I added those for SymbianOS years ago, since that target
> had a post link step to convert elf to pe/dll, and it'd be the latter that'd
> be copied to the target. IIRC.
>
>
>> So gdb_load_shlibs would then become:
>>
>> proc gdb_load_shlibs { args } {
>> foreach file $args {
>> gdb_download [shlib_target_file $file]
>> }
>> }
>>
>> I just tested it quickly and it seems to work fine. But I also noticed that there
>> might be some overlap in feature between gdb_download and gdb_remote_download, so
>> perhaps I can try to merge them, WDYT?
>>
>
> Indeed.
>
>>>> # Even if the target supplies full paths for shared libraries,
>>>> # they may not be paths for this system.
>>>> gdb_test "set solib-search-path [file dirname [lindex $args 0]]" "" ""
>>>
>>> Can we skip this command on native testing?
>>>
>>> I'm worried that that command might paper over, or cause, issues with
>>> sysroot / dso path lookup. Normal native debugging usage will not specify
>>> that command, so if we could avoid it, I'd prefer it, on grounds of
>>> testing what users normally use.
>>
>> Makes sense. I'll add that, with a comment explaining why.
>>
>> Thanks!
>>
>
> Thank you!
>
V2 posted here: https://sourceware.org/ml/gdb-patches/2016-04/msg00047.html