Compilation fails with error: 'constexpr' needed for in-class initialization of static data member

[mike01]

When compiling via "make" the following error message appears:

In file included from ../TRXManager/TRXManager.h:30:0,
from ../UMTS/UMTSL1CC.h:28,
from ../UMTS/UMTSL1FEC.h:28,
from ../UMTS/UMTSConfig.h:30,
from CLI.cpp:31:
../UMTS/UMTSRadioModem.h: At global scope:
../UMTS/UMTSRadioModem.h:181:28: error: 'constexpr' needed for in-class initialization of static data member 'const float UMTS::RadioModem::mRACHThreshold' of non-integral type [-fpermissive]
static const float mRACHThreshold = 10.0;
^~~~~~~~~~~~~~
CLI.cpp: In function 'CommandLine::CLIStatus CommandLine::sendsimple(int, char**, std::ostream&)':
CLI.cpp:480:137: warning: format '%u' expects argument of type 'unsigned int', but argument 13 has type 'size_t {aka long unsigned int' [-Wformat=]
SI, (unsigned)random(), srcAddr,srcAddr,sock.port(),(unsigned)random(), IMSI, (unsigned)random(),sock.port(), strlen(txtBuf), txtBuf);
~~~~~~~~~~~~~~ ^
CLI.cpp: At global scope:
CLI.cpp:270:18: warning: 'CommandLine::CLIStatus CommandLine::printStats(int, char**, std::ostream&)' declared 'static' but never defined [-Wunused-function]
static CLIStatus printStats(int argc, char** argv, ostream& os);
^~~~~~~~~~
CLI.cpp:1092:18: warning: 'CommandLine::CLIStatus CommandLine::endcall(int, char**, std::ostream&)' defined but not used [-Wunused-function]
static CLIStatus endcall(int argc, char argv, ostream& os)
^~~~~~~
CLI.cpp:370:20: warning: 'CommandLine::tmsisHelp' defined but not used [-Wunused-variable]
static const char tmsisHelp = "[-l | clear | dump [-l] | -delete -tmsi | -delete -imsi | -query ] --\n"
^~~~~~~~~
CLI.cpp:231:27: warning: 'std::map<std::__cxx11::basic_string, std::__cxx11::basic_string > CommandLine::cliParse(int&, char&, std::ostream&, const char)' defined but not used [-Wunused-function]
static map<string,string> cliParse(int &argc, char **&argv, ostream &os, const char *optstring)
^~~~~~~~
make[2]: *** [Makefile:500: CLI.lo] Error 1
make[2]: Leaving directory '/home/mike/folder/progs/openbts_3g_v1/OpenBTS-UMTS/CLI'
make[1]: *** [Makefile:549: all-recursive] Error 1
make[1]: Leaving directory '/home/mike/folder/progs/openbts_3g_v1/OpenBTS-UMTS'
make: *** [Makefile:480: all] Error 2

[vandong123]

../UMTS/UMTSRadioModem.h:181:16: error: ‘constexpr’ does not name a type
i got same error. does anyone fix that?

[alejandro-amo]

Same here. Researching possible solutions

[alejandro-amo]

found it. #25 and #26 are caused for more or less the same thing.
see #26 (comment)

[bbaranoff]

If not working just with gcc-5 g++-5 try to add
make CXXFLAGS=-std=c++11