In which OS?
I compiled Lazarus 1.6.2 with FPC 3.0.2 in Linux x64 and Raspberry Pi without problems.
I have to mention that I am using fpcdeluxe, and I mean building the combination with fpcdeluxe, rather than bootstrapping the compilation with fpc 3.0.2, in case that caused confustion
Build combinations that failed:
Lazarus 1.6.2 and FPC 3.0.0 - (standard release)
Build combinations that worked:
Lazarus 1.6.2 and FPC 3.0.0
Lazarus 1.6.2 fixes and Lazarus 3.0.2 fixes
I will try the failed combination again to see if it will turn out right.