Unable to use complex libraries in 64bits?

Question

hello all,
i have this short program:
#include <complex.h>
int main()
        complex z(1,2), zz(3, 4);
        complex zzz = z + zz;
}calypso-henry% CC -compat -m32 -o comp1 comp1.C -I/opt/SUNWspro/include -L/opt/SUNWspro/lib -lcomplex -lm
but
calypso-henry% CC -compat -m64 -o comp1 comp1.C -I/opt/SUNWspro/include -L/opt/SUNWspro/lib -lcomplex -lm
CC: Warning: -compat=4 is not supported with -xarch=sparc, -compat=4 turned off
"comp1.C", line 5: Error: complex is not defined.
"comp1.C", line 7: Error: complex is not defined.
2 Error(s) detected.
where am i wrong?
I'm using Sun Studion with latest patches, on Solaris 10 (sparc and amd64!)
thanks in advance for help,
gerard

Answer 1

First of all, there is no need to specify complier installation directory in -I and/or -L options; compilers knows where to look for its own libraries and includes. In fact, -I/opt/SUNWspro/include -L/opt/SUNWspro/libwill interfere with compiler's algorithms of libraries/includes lookup and cause unwanted side effects.
Replace those with
-library=complexas CC(1) suggests. libm will be linked automatically.
Now, to the difference between compat=4 (-compat) and compat=5 (no -compat option). compat=4 implies very old, pre-standard C++ syntax and semantics. Is there a solid reason for using it, especially in modern Solaris 10 environment? Also, as the warning suggests, compat=4 is not supported with 64-bit sparc (-xarch=v9).
I'm not sure why your code does not compile in -m64 (with proper compiler options), but I think I know the right way to arrange things:
1. Use C++ includes instead of C-style includes:
#include <complex>2. Since C++-style headers inject names into std namespace, you'll have to write std::complex; also, complex is a template class, so you'll need to write std::template<float>, for example, or provide typedefs.
3. Do not use -compat; in fact, it is better to switch to STLport library (-library=stlport4) than continue using outdated (but provided for backward compatibility libCstd). In short, add this to compilation line:
-library=stlport4To summarize: here's the code that works and correct compiler parameters
$ cat test.cc
#include <complex>
int main()
        typedef std::complex<float> complex;
        complex z(1,2), zz(3, 4);
        complex zzz = z + zz;
$ CC  -m64 -library=stlport4 -library=complex test.cc