32bit build on debian stretch fails due to size mismatch

[timkb4cq]

In file included from ../../../src/db/db/dbOASISWriter.h:31:0,
                 from ../../../src/db/db/dbOASIS.cc:26:
../../../src/db/db/dbHash.h: In instantiation of ‘std::size_t __gnu_cxx::hfunc(const T&) [with T = long long int; std::size_t = unsigned int]’:
../../../src/db/db/dbHash.h:124:84:   required from here
../../../src/db/db/dbHash.h:107:15: error: no match for call to ‘(__gnu_cxx::hash<long long int>) (const long long int&)’
     return hf (t);
            ~~~^~~
Makefile:3716: recipe for target 'dbOASIS.o' failed

[klayoutmatthias]

I'm no longer trying to support 32bit on Linux. That would double my continuous integration efforts.

Please try to replace line 89 of src/db/db/dbHash.h with this:

#elif defined(_WIN32) || (defined(__GNUC__) && defined(__i386__))

and let me know whether this works.

[danfe]

Yes, this fixes the build on 32-bit architectures, thanks! FWIW, powerpc suffers the same as i386 here, so either both __i386__ and __powerpc__ should be listed there, or some more generic check, e.g. #elif sizeof(void *) == 4 or, if that does not work, #elif __SIZE_WIDTH__ == 32 used instead.