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

[Christian Mauderer]

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:
>