Undefined behaviour in TYPMOD_GET_SRID

[Raul Marin]

Some output examples using undefined behaviour sanitizer:

Running test 'test_typmod_macros' in suite 'serialization/deserialization'.
cu_libgeom.c:35:7: runtime error: left shift of 535589632 by 3 places cannot be represented in type 'int'
cu_libgeom.c:45:14: runtime error: left shift of 280871168 by 3 places cannot be represented in type 'int'

Basically it's at the mercy of how the compiler/cpu decides to handle the shift.

PR in Github with the fix: ​https://github.com/postgis/postgis/pull/152

[pramsey]

In 15914:

Undefined behaviour in TYPMOD_GET_SRID
References #3880

[pramsey]

In 15915:

Undefined behaviour in TYPMOD_GET_SRID
References #3880

[pramsey]

In 15916:

Undefined behaviour in TYPMOD_GET_SRID
References #3880

[pramsey]

In 15917:

Undefined behaviour in TYPMOD_GET_SRID
Closes #3880