[PATCH rtems-tools] trace: Use c++14 instead of c++11 if possible

[Christian Mauderer]

Ping again.

It's clearly not BSP specific. So I would like to get an approval for
that before pushing it anywhere.

On 15/06/2020 17:36, Christian Mauderer wrote:
> Ping.
> 
> Currently shouldn't be a matter for much hosts (less than 20 including
> FreeBSD, Fedora, Arch, openSUSE according to distrowatch [1]) but I
> assume that llvm 10 will spread fast.
> 
> 
> [1]
> http://distrowatch.org/search.php?pkg=llvm&relation=greaterequal&pkgver=10&distrorange=InLatest#pkgsearch
> 
> 
> On 08/06/2020 08:52, Christian Mauderer wrote:
>> llvm version 10 uses features from c++14 standard in the headers. With
>> that, the record/record-main-lttng.cc doesn't build any more. This patch
>> makes sure that c++14 is used if it is available.
>> ---
>>  trace/wscript | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/trace/wscript b/trace/wscript
>> index 656f92b..53a1ab4 100644
>> --- a/trace/wscript
>> +++ b/trace/wscript
>> @@ -45,6 +45,7 @@ def configure(conf):
>>      if conf.check(header_name='zlib.h', features='cxx', mandatory=False):
>>          conf.check_cxx(lib = 'z')
>>      conf.check_cxx(lib = 'ws2_32', mandatory=False)
>> +    conf.check_cxx(cxxflags='-std=c++14', mandatory=False, define_name="HAVE_STD_CXX14")
>>      conf.write_config_header('config.h')
>>  
>>  def build(bld):
>> @@ -60,7 +61,10 @@ def build(bld):
>>      conf['warningflags'] = ['-Wall', '-Wextra', '-pedantic']
>>      conf['optflags'] = bld.env.C_OPTS
>>      conf['cflags'] = ['-pipe', '-g'] + conf['optflags']
>> -    conf['cxxflags'] = ['-std=c++11'] + conf['cflags']
>> +    cxxstd = '-std=c++11'
>> +    if bld.env.HAVE_STD_CXX14:
>> +        cxxstd = '-std=c++14'
>> +    conf['cxxflags'] = [cxxstd] + conf['cflags']
>>      conf['linkflags'] = ['-g']
>>      conf['lib'] = []
>>      if bld.env.LIB_WS2_32:
>>
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