Scons checking for compiler option -

i want check in scons compiler support option (for example -fcilkplus). way manage following sequence of operations:

env.prepend(cxxflags = ['-fcilkplus'], libs = ['cilkrts']) 

then launch custom checker:

def checkcilkpluscompiler(context):     test = """     #include <cilk/cilk.h>     #include <assert.h>     int fib(int n) {       if (n < 2) return n;       int = cilk_spawn fib(n-1);       int b = fib(n-2);       cilk_sync;       return + b;     }     int main() {       int result = fib(30);       assert(result == 832040);       return 0;     }     """     context.message('checking cilk++ compiler ... ')     result = context.tryrun(test, '.cpp')     context.result(result[0])     return result[0] 

now if fails, have remove 2 options flags -fcilkplus cilkrts environment variables. there better way ?

the problem can't manage access env context , therefore can't make clone of it.

you can use check availability of library scons follows:

env = environment() conf = configure(env) if not conf.checklib('cilkrts'):     print 'did not find libcilkrts.a, exiting!'     exit(1) else:     env.prepend(cxxflags = ['-fcilkplus'], libs = ['cilkrts'])  env = conf.finish() 

you check availability of header follows:

env = environment() conf = configure(env) if conf.checkcheader('cilk/cilk.h'):     env.prepend(cxxflags = ['-fcilkplus'], libs = ['cilkrts']) env = conf.finish() 

update:

i realized, can access environment on configure object follows:

conf.env.append(...)