[PATCH] Related: OS#3663 Fix failed compilation on macOS Mojave with clang in CMakeLists.txt

[Michael Auß]

> Am 20.10.2018 um 01:45 schrieb Greg Troxel <gdt at lexort.com>:
>  My point really is that there should be a decision about the language, that should  be in the
> README, and the build system should set --std for that chosen language,
> and then whatever needs to be fixed should be fixed.



I only added the flag for compilers based on the existing pattern *.clang and my new pattern matching "c++“.
So the Build system is setting the language only for clang at this point.

I tested  the output for c++98 which resulted in the bugs original errors:

[ 61%] Building CXX object lib/CMakeFiles/gnuradio-osmosdr.dir/rtl_tcp/rtl_tcp_source_c.cc.o
/Users/aussmich/Projekte/gr-osmosdr/lib/rtl_tcp/rtl_tcp_source_c.cc:301:9: error: expected expression
  cmd = { 0x09, htonl(direct_samp) };
        ^
/Users/aussmich/Projekte/gr-osmosdr/lib/rtl_tcp/rtl_tcp_source_c.cc:307:9: error: expected expression
  cmd = { 0x0a, htonl(offset_tune) };
        ^
/Users/aussmich/Projekte/gr-osmosdr/lib/rtl_tcp/rtl_tcp_source_c.cc:311:9: error: expected expression
  cmd = { 0x0e, htonl(bias_tee) };
        ^
/Users/aussmich/Projekte/gr-osmosdr/lib/rtl_tcp/rtl_tcp_source_c.cc:570:9: error: expected expression
  cmd = { 0x08, htonl(automatic) };
        ^
In file included from /Users/aussmich/Projekte/gr-osmosdr/lib/rtl_tcp/rtl_tcp_source_c.cc:30:
In file included from /Users/aussmich/Projekte/gr-osmosdr/lib/rtl_tcp/rtl_tcp_source_c.h:23:
In file included from /usr/local/Cellar/gnuradio/3.7.13.4/include/gnuradio/sync_block.h:27:
In file included from /usr/local/Cellar/gnuradio/3.7.13.4/include/gnuradio/block.h:29:
/usr/local/Cellar/gnuradio/3.7.13.4/include/gnuradio/logger.h:766:16: warning: private field 'd_logger' is not used [-Wunused-private-field]
    logger_ptr d_logger;
               ^
1 warning and 4 errors generated.
make[2]: *** [lib/CMakeFiles/gnuradio-osmosdr.dir/rtl_tcp/rtl_tcp_source_c.cc.o] Error 1
make[1]: *** [lib/CMakeFiles/gnuradio-osmosdr.dir/all] Error 2
make: *** [all] Error 2



I then tried c++11 which compiles just fine, so the minimum language required for this file is c++11 and not c++14 as stated in my patch.