I am porting a C/C++ development environment from Solaris 10 to Solaris 11. (Yes, I know - ancient history! Still needed for supporting a legacy product.) Everything has gone smoothly except in the final compilation phase, I am getting uint64_t undefined errors. (This is a 32-bit Solaris 11 system.) It is caused by new .h system files being included on S11, not there on S10, which contain these types. I understand that the C99 standard says this should be supported on 32-bit systems, but looking at int_types.h, I see that _LONGLONG_TYPE needs to be defined to get uint64_t defined.
So I tried to include a -D_LONGLONG_TYPE in my makefiles, but then I get the compilation error
"/usr/include/sys/feature_tests.h", line 394: #error: "No long long in strictly conforming ANSI C & 1990 ISO C environments"
So that looks like the wrong track. I scrapped that -D option and replaced it with -D_STDC_C99 (which causes _LONGLONG_TYPE to be defined in feature_tests.h) and that satisfied the compiler. But is that the correct way to fix this problem?