GCC/CLANG/MSVS warning disable pragmas

#ifndef WARNING_DISABLE_PRAGMAS_H
#define WARNING_DISABLE_PRAGMAS_H

/* This pragmatic code is courtesy of Martin Gerhardy posted on the web at
 *   http://stackoverflow.com/questions/3378560/how-to-disable-gcc-warnings-for-a-few-lines-of-code
 * and further integrated to NUT by Jim Klimov. From original post comments:
 * ...This should do the trick for gcc, clang and msvc
 * Can be called with e.g.:
DISABLE_WARNING(unused-variable,unused-variable,42)
[.... some code with warnings in here ....]
ENABLE_WARNING(unused-variable,unused-variable,42)
 * see https://gcc.gnu.org/onlinedocs/cpp/Pragmas.html
 * and http://clang.llvm.org/docs/UsersManual.html#controlling-diagnostics-via-pragmas
 * and https://msdn.microsoft.com/de-DE/library/d9x1s805.aspx for more details
 * You need at least version 4.02 to use these kind of pragmas for gcc,
 * not sure about msvc and clang about the versions.
 */
#if defined(__clang__) || defined(__GNUC__) || defined(_MSC_VER)
# define DIAG_STR(s) #s
# define DIAG_JOINSTR(x,y) DIAG_STR(x ## y)
# ifdef _MSC_VER
#  define DIAG_DO_PRAGMA(x) __pragma (#x)
#  define DIAG_PRAGMA(compiler,x) DIAG_DO_PRAGMA(warning(x))
# else
#  define DIAG_DO_PRAGMA(x) _Pragma (#x)
#  define DIAG_PRAGMA(compiler,x) DIAG_DO_PRAGMA(compiler diagnostic x)
# endif
#else
# define DIAG_STR(S)
# define DIAG_JOINSTR(x,y)
# define DIAG_DO_PRAGMA(x)
# define DIAG_PRAGMA(compiler,x)
#endif

#if defined(__clang__)
# define DISABLE_WARNING(gcc_unused,clang_option,msvc_unused) DIAG_PRAGMA(clang,push) DIAG_PRAGMA(clang,ignored DIAG_JOINSTR(-W,clang_option))
# define ENABLE_WARNING(gcc_unused,clang_option,msvc_unused) DIAG_PRAGMA(clang,pop)
#elif defined(_MSC_VER)
# define DISABLE_WARNING(gcc_unused,clang_unused,msvc_errorcode) DIAG_PRAGMA(msvc,push) DIAG_DO_PRAGMA(warning(disable:##msvc_errorcode))
# define ENABLE_WARNING(gcc_unused,clang_unused,msvc_errorcode) DIAG_PRAGMA(msvc,pop)
#elif defined(__GNUC__)
# if ((__GNUC__ * 100) + __GNUC_MINOR__) >= 406
#  define DISABLE_WARNING(gcc_option,clang_unused,msvc_unused) DIAG_PRAGMA(GCC,push) DIAG_PRAGMA(GCC,ignored DIAG_JOINSTR(-W,gcc_option))
#  define ENABLE_WARNING(gcc_option,clang_unused,msvc_unused) DIAG_PRAGMA(GCC,pop)
# else
#  define DISABLE_WARNING(gcc_option,clang_unused,msvc_unused) DIAG_PRAGMA(GCC,ignored DIAG_JOINSTR(-W,gcc_option))
#  define ENABLE_WARNING(gcc_option,clang_option,msvc_unused) DIAG_PRAGMA(GCC,warning DIAG_JOINSTR(-W,gcc_option))
# endif
#else
# define DISABLE_WARNING(gcc_option,clang_unused,msvc_unused) /* DISABLE_WARNING not supported for this compiler */
# define ENABLE_WARNING(gcc_option,clang_unused,msvc_unused)  /* ENABLE_WARNING not supported for this compiler */
#endif

#endif /* WARNING_DISABLE_PRAGMAS_H */