Preprocessor #if code incorrect

[WilliamKF]

The C preprocessor is not correctly processing complex rules. The following example is processed incorrectly:

#define SDS_ARCH_darwin_15_i86

#ifdef SDS_ARCH_freebsd_61_i86
#include <sys/endian.h>
#elif defined(SDS_ARCH_darwin_15_i86)
#include <libkern/OSByteOrder.h> // Incorrectly not taken.
#elif defined(SDS_ARCH_winxp) || defined(SDS_ARCH_Interix)
#else
#include <byteswap.h>  // Incorrectly taken
#endif

[guwirth]

Could you do some more testing please:
is this working: #define SDS_ARCH_darwin_15_i86 1

[WilliamKF]

Yeah, I had already tried that, doesn't help.

[guwirth]

we need more low level tests: https://github.com/SonarOpenCommunity/sonar-cxx/blob/2105e6eec7b3d8fc60acc9e0eaacfa05e02e024e/cxx-squid/src/test/java/org/sonar/cxx/lexer/CxxLexerWithPreprocessingTest.java

[guwirth]

@WilliamKF Solution #692