[committed,gdb/testsuite] Make skip_libstdcxx_probe_tests return 1 if true

  [ was: Re: [PATCH][gdb, c++] Improve error message when using libstdcxx
without SDT probes ]

On 26-08-19 16:11, Sergio Durigan Junior wrote:
>> +set libstdcxx_probe_tests_supported [skip_libstdcxx_probe_tests]
> Not your fault, but this reversed logic (skip_libstdcxx_probe_tests
> returns 0 if the tests should be skipped) is kinda confusing.
> 

It's also confusing me.

Fixed in attached patch.

Committed.

Thanks,
- Tom
  

On Monday, August 26 2019, Tom de Vries wrote:

> [ was: Re: [PATCH][gdb, c++] Improve error message when using libstdcxx
> without SDT probes ]
>
> On 26-08-19 16:11, Sergio Durigan Junior wrote:
>>> +set libstdcxx_probe_tests_supported [skip_libstdcxx_probe_tests]
>> Not your fault, but this reversed logic (skip_libstdcxx_probe_tests
>> returns 0 if the tests should be skipped) is kinda confusing.
>> 
>
> It's also confusing me.
>
> Fixed in attached patch.

Aha, thanks!

> Committed.
>
> Thanks,
> - Tom
>
> [gdb/testsuite] Make skip_libstdcxx_probe_tests return 1 if true
>
> The tcl proc skip_libstdcxx_probe_tests currently returns 0 if the probe tests
> need to be skipped, while tcl interprets 0 as false rather than true, which is
> confusing.
>
> Fix this by making skip_libstdcxx_probe_tests return 1 if the probe tests need
> to be skipped.
>
> Tested on x86_64-linux.
>
> gdb/testsuite/ChangeLog:
>
> 2019-08-26  Tom de Vries  <tdevries@suse.de>
>
> 	* lib/gdb.exp (skip_libstdcxx_probe_tests_prompt): Return 1 if probe
> 	* tests need to be skipped.
> 	* gdb.cp/exceptprint.exp: Update call to skip_libstdcxx_probe_tests.
> 	* gdb.mi/mi-catch-cpp-exceptions.exp: Update call to
> 	mi_skip_libstdcxx_probe_tests.
>
> ---
>  gdb/testsuite/gdb.cp/exceptprint.exp             | 2 +-
>  gdb/testsuite/gdb.mi/mi-catch-cpp-exceptions.exp | 2 +-
>  gdb/testsuite/lib/gdb.exp                        | 9 +++++----
>  3 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/gdb/testsuite/gdb.cp/exceptprint.exp b/gdb/testsuite/gdb.cp/exceptprint.exp
> index 46378d1b69..f6dcd0f5bd 100644
> --- a/gdb/testsuite/gdb.cp/exceptprint.exp
> +++ b/gdb/testsuite/gdb.cp/exceptprint.exp
> @@ -27,7 +27,7 @@ if {![runto_main]} {
>      return -1
>  }
>  
> -if {![skip_libstdcxx_probe_tests]} {
> +if {[skip_libstdcxx_probe_tests]} {
>      untested "could not find libstdc++ stap probe"
>      return -1
>  }
> diff --git a/gdb/testsuite/gdb.mi/mi-catch-cpp-exceptions.exp b/gdb/testsuite/gdb.mi/mi-catch-cpp-exceptions.exp
> index 029dc1bd02..2951497882 100644
> --- a/gdb/testsuite/gdb.mi/mi-catch-cpp-exceptions.exp
> +++ b/gdb/testsuite/gdb.mi/mi-catch-cpp-exceptions.exp
> @@ -36,7 +36,7 @@ mi_gdb_load ${binfile}
>  if {![mi_run_to_main]} {
>      return -1
>  }
> -set libstdcxx_probe_tests_supported [mi_skip_libstdcxx_probe_tests]
> +set libstdcxx_probe_tests_supported [expr ![mi_skip_libstdcxx_probe_tests]]
>  
>  # Grab some line numbers we'll need.
>  set catch_1_lineno [gdb_get_line_number "Catch 1"]
> diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
> index af56e8aa12..76805fb5ec 100644
> --- a/gdb/testsuite/lib/gdb.exp
> +++ b/gdb/testsuite/lib/gdb.exp
> @@ -3158,20 +3158,21 @@ proc skip_unwinder_tests {} {
>      return $ok
>  }
>  
> -# Return 0 if we should skip tests that require the libstdc++ stap
> +# Return 1 if we should skip tests that require the libstdc++ stap
>  # probes.  This must be invoked while gdb is running, after shared
>  # libraries have been loaded.  PROMPT_REGEXP is the expected prompt.
>  
>  proc skip_libstdcxx_probe_tests_prompt { prompt_regexp } {
> -    set ok 0
> +    set supported 0
>      gdb_test_multiple "info probe" "check for stap probe in libstdc++" {
>  	-re ".*libstdcxx.*catch.*\r\n$prompt_regexp" {
> -	    set ok 1
> +	    set supported 1
>  	}
>  	-re "\r\n$prompt_regexp" {
>  	}
>      } "$prompt_regexp"
> -    return $ok
> +    set skip [expr !$supported]
> +    return $skip
>  }
>  
>  # As skip_libstdcxx_probe_tests_prompt, with gdb_prompt.
>