[01/11] gdb/testsuite: ignore Non-C-typedefs for gdb.cp/class2.exp

  When attempting to test gdb.cp/class2.exp using clang, it fails to
prepare with the following error:

Executing on host: clang++    -fdiagnostics-color=never -Wno-unknown-warning-option  -c -g -o /home/blarsen/Documents/fsf_build/gdb/testsuite/outputs/gdb.cp/class2/class20.o /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc    (timeout = 300)
builtin_spawn -ignore SIGHUP clang++ -fdiagnostics-color=never -Wno-unknown-warning-option -c -g -o /home/blarsen/Documents/fsf_build/gdb/testsuite/outputs/gdb.cp/class2/class20.o /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc
/home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:53:14: warning: anonymous non-C-compatible type given name for linkage purposes by typedef declaration; add a tag name here [-Wnon-c-typedef-for-linkage]
typedef class {
             ^
              Dbase
/home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:54:2: note: type is not C-compatible due to this member declaration
 public:
 ^~~~~~~
/home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:58:3: note: type is given name 'Dbase' for linkage purposes by this typedef declaration
} Dbase;
  ^
1 warning generated.
gdb compile failed, /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:53:14: warning: anonymous non-C-compatible type given name for linkage purposes by typedef declaration; add a tag name here [-Wnon-c-typedef-for-linkage]
typedef class {
             ^
              Dbase
/home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:54:2: note: type is not C-compatible due to this member declaration
 public:
 ^~~~~~~
/home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:58:3: note: type is given name 'Dbase' for linkage purposes by this typedef declaration
} Dbase;
  ^
1 warning generated.
UNTESTED: gdb.cp/class2.exp: failed to prepare

This can be silenced by adding -Wno-non-c-typedef-for-linkage. The test
shows no failures with this change.
---
 gdb/testsuite/gdb.cp/class2.exp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
  

Bruno Larsen via Gdb-patches <gdb-patches@sourceware.org> writes:

> When attempting to test gdb.cp/class2.exp using clang, it fails to
> prepare with the following error:
>
> Executing on host: clang++    -fdiagnostics-color=never -Wno-unknown-warning-option  -c -g -o /home/blarsen/Documents/fsf_build/gdb/testsuite/outputs/gdb.cp/class2/class20.o /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc    (timeout = 300)
> builtin_spawn -ignore SIGHUP clang++ -fdiagnostics-color=never -Wno-unknown-warning-option -c -g -o /home/blarsen/Documents/fsf_build/gdb/testsuite/outputs/gdb.cp/class2/class20.o /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc
> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:53:14: warning: anonymous non-C-compatible type given name for linkage purposes by typedef declaration; add a tag name here [-Wnon-c-typedef-for-linkage]
> typedef class {
>              ^
>               Dbase
> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:54:2: note: type is not C-compatible due to this member declaration
>  public:
>  ^~~~~~~
> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:58:3: note: type is given name 'Dbase' for linkage purposes by this typedef declaration
> } Dbase;
>   ^
> 1 warning generated.
> gdb compile failed, /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:53:14: warning: anonymous non-C-compatible type given name for linkage purposes by typedef declaration; add a tag name here [-Wnon-c-typedef-for-linkage]
> typedef class {
>              ^
>               Dbase
> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:54:2: note: type is not C-compatible due to this member declaration
>  public:
>  ^~~~~~~
> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:58:3: note: type is given name 'Dbase' for linkage purposes by this typedef declaration
> } Dbase;
>   ^
> 1 warning generated.
> UNTESTED: gdb.cp/class2.exp: failed to prepare
>
> This can be silenced by adding -Wno-non-c-typedef-for-linkage. The test
> shows no failures with this change.
> ---
>  gdb/testsuite/gdb.cp/class2.exp | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/gdb/testsuite/gdb.cp/class2.exp b/gdb/testsuite/gdb.cp/class2.exp
> index 32f9dfc18a5..e1e4ad0fae6 100644
> --- a/gdb/testsuite/gdb.cp/class2.exp
> +++ b/gdb/testsuite/gdb.cp/class2.exp
> @@ -18,7 +18,7 @@ if { [skip_cplus_tests] } { return }
>  
>  standard_testfile .cc
>  
> -if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
> +if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++ additional_flags=-Wno-non-c-typedef-for-linkage}]} {
>      return -1

I worry about just adding an extra flag like this.  GCC is happy enough
as it ignores unknown arguments, but some other compiler might be
unhappy.

Additionally, with earlier versions of clang++ (I tested 9.0.1) the new
flag isn't recognised, and actually causes the build to fail.

I wonder if we should look to something like gdb.cp/pr9167.exp for how
to solve this?  In that script we do this:

  set flags [list debug c++]
  if { [test_compiler_info gcc-*] && [gcc_major_version] >= 10 } {
      # Work around PR gcc/101452.
      lappend flags additional_flags=-fno-eliminate-unused-debug-types
  }

this might be a better model for how to add the flag.

Thanks,
Andrew
  

On 26/10/2022 14:02, Andrew Burgess wrote:
> Bruno Larsen via Gdb-patches <gdb-patches@sourceware.org> writes:
>
>> When attempting to test gdb.cp/class2.exp using clang, it fails to
>> prepare with the following error:
>>
>> Executing on host: clang++    -fdiagnostics-color=never -Wno-unknown-warning-option  -c -g -o /home/blarsen/Documents/fsf_build/gdb/testsuite/outputs/gdb.cp/class2/class20.o /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc    (timeout = 300)
>> builtin_spawn -ignore SIGHUP clang++ -fdiagnostics-color=never -Wno-unknown-warning-option -c -g -o /home/blarsen/Documents/fsf_build/gdb/testsuite/outputs/gdb.cp/class2/class20.o /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc
>> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:53:14: warning: anonymous non-C-compatible type given name for linkage purposes by typedef declaration; add a tag name here [-Wnon-c-typedef-for-linkage]
>> typedef class {
>>               ^
>>                Dbase
>> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:54:2: note: type is not C-compatible due to this member declaration
>>   public:
>>   ^~~~~~~
>> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:58:3: note: type is given name 'Dbase' for linkage purposes by this typedef declaration
>> } Dbase;
>>    ^
>> 1 warning generated.
>> gdb compile failed, /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:53:14: warning: anonymous non-C-compatible type given name for linkage purposes by typedef declaration; add a tag name here [-Wnon-c-typedef-for-linkage]
>> typedef class {
>>               ^
>>                Dbase
>> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:54:2: note: type is not C-compatible due to this member declaration
>>   public:
>>   ^~~~~~~
>> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:58:3: note: type is given name 'Dbase' for linkage purposes by this typedef declaration
>> } Dbase;
>>    ^
>> 1 warning generated.
>> UNTESTED: gdb.cp/class2.exp: failed to prepare
>>
>> This can be silenced by adding -Wno-non-c-typedef-for-linkage. The test
>> shows no failures with this change.
>> ---
>>   gdb/testsuite/gdb.cp/class2.exp | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/gdb/testsuite/gdb.cp/class2.exp b/gdb/testsuite/gdb.cp/class2.exp
>> index 32f9dfc18a5..e1e4ad0fae6 100644
>> --- a/gdb/testsuite/gdb.cp/class2.exp
>> +++ b/gdb/testsuite/gdb.cp/class2.exp
>> @@ -18,7 +18,7 @@ if { [skip_cplus_tests] } { return }
>>   
>>   standard_testfile .cc
>>   
>> -if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
>> +if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++ additional_flags=-Wno-non-c-typedef-for-linkage}]} {
>>       return -1
> I worry about just adding an extra flag like this.  GCC is happy enough
> as it ignores unknown arguments, but some other compiler might be
> unhappy.
>
> Additionally, with earlier versions of clang++ (I tested 9.0.1) the new
> flag isn't recognised, and actually causes the build to fail.
Good call. This flag seems to have been added by clang-11, so I'll check 
for that version.
>
> I wonder if we should look to something like gdb.cp/pr9167.exp for how
> to solve this?  In that script we do this:
>
>    set flags [list debug c++]
>    if { [test_compiler_info gcc-*] && [gcc_major_version] >= 10 } {
>        # Work around PR gcc/101452.
>        lappend flags additional_flags=-fno-eliminate-unused-debug-types
>    }
>
> this might be a better model for how to add the flag.

Looking at gcc_major_version, this looks too verbose. gcc_major_version 
already checks for the given compiler, returning -1 if the compiler is 
not the expected one, so that code from gdb.cp/pr9167.exp could be 
shortened to:

if  { [ gcc_major_version ] >= 10 } {
     ....
}

What do you think?

(I also think the function should be renamed, but that is a patch for 
another day).

Cheers,
Bruno

>
> Thanks,
> Andrew
>
  

Bruno Larsen <blarsen@redhat.com> writes:

> On 26/10/2022 14:02, Andrew Burgess wrote:
>> Bruno Larsen via Gdb-patches <gdb-patches@sourceware.org> writes:
>>
>>> When attempting to test gdb.cp/class2.exp using clang, it fails to
>>> prepare with the following error:
>>>
>>> Executing on host: clang++    -fdiagnostics-color=never -Wno-unknown-warning-option  -c -g -o /home/blarsen/Documents/fsf_build/gdb/testsuite/outputs/gdb.cp/class2/class20.o /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc    (timeout = 300)
>>> builtin_spawn -ignore SIGHUP clang++ -fdiagnostics-color=never -Wno-unknown-warning-option -c -g -o /home/blarsen/Documents/fsf_build/gdb/testsuite/outputs/gdb.cp/class2/class20.o /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc
>>> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:53:14: warning: anonymous non-C-compatible type given name for linkage purposes by typedef declaration; add a tag name here [-Wnon-c-typedef-for-linkage]
>>> typedef class {
>>>               ^
>>>                Dbase
>>> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:54:2: note: type is not C-compatible due to this member declaration
>>>   public:
>>>   ^~~~~~~
>>> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:58:3: note: type is given name 'Dbase' for linkage purposes by this typedef declaration
>>> } Dbase;
>>>    ^
>>> 1 warning generated.
>>> gdb compile failed, /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:53:14: warning: anonymous non-C-compatible type given name for linkage purposes by typedef declaration; add a tag name here [-Wnon-c-typedef-for-linkage]
>>> typedef class {
>>>               ^
>>>                Dbase
>>> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:54:2: note: type is not C-compatible due to this member declaration
>>>   public:
>>>   ^~~~~~~
>>> /home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.cp/class2.cc:58:3: note: type is given name 'Dbase' for linkage purposes by this typedef declaration
>>> } Dbase;
>>>    ^
>>> 1 warning generated.
>>> UNTESTED: gdb.cp/class2.exp: failed to prepare
>>>
>>> This can be silenced by adding -Wno-non-c-typedef-for-linkage. The test
>>> shows no failures with this change.
>>> ---
>>>   gdb/testsuite/gdb.cp/class2.exp | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/gdb/testsuite/gdb.cp/class2.exp b/gdb/testsuite/gdb.cp/class2.exp
>>> index 32f9dfc18a5..e1e4ad0fae6 100644
>>> --- a/gdb/testsuite/gdb.cp/class2.exp
>>> +++ b/gdb/testsuite/gdb.cp/class2.exp
>>> @@ -18,7 +18,7 @@ if { [skip_cplus_tests] } { return }
>>>   
>>>   standard_testfile .cc
>>>   
>>> -if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
>>> +if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++ additional_flags=-Wno-non-c-typedef-for-linkage}]} {
>>>       return -1
>> I worry about just adding an extra flag like this.  GCC is happy enough
>> as it ignores unknown arguments, but some other compiler might be
>> unhappy.
>>
>> Additionally, with earlier versions of clang++ (I tested 9.0.1) the new
>> flag isn't recognised, and actually causes the build to fail.
> Good call. This flag seems to have been added by clang-11, so I'll check 
> for that version.
>>
>> I wonder if we should look to something like gdb.cp/pr9167.exp for how
>> to solve this?  In that script we do this:
>>
>>    set flags [list debug c++]
>>    if { [test_compiler_info gcc-*] && [gcc_major_version] >= 10 } {
>>        # Work around PR gcc/101452.
>>        lappend flags additional_flags=-fno-eliminate-unused-debug-types
>>    }
>>
>> this might be a better model for how to add the flag.
>
> Looking at gcc_major_version, this looks too verbose. gcc_major_version 
> already checks for the given compiler, returning -1 if the compiler is 
> not the expected one, so that code from gdb.cp/pr9167.exp could be 
> shortened to:
>
> if  { [ gcc_major_version ] >= 10 } {
>      ....
> }

I guess you actually need:

 [ gcc_major_version "gcc-*" c++ ]

in order to check the C++ compiler.

Thanks,
Andrew

>
> What do you think?
>
> (I also think the function should be renamed, but that is a patch for 
> another day).
>
> Cheers,
> Bruno
>
>>
>> Thanks,
>> Andrew
>>