ID Number: Q68385
6.00 6.00a 6.00ax | 6.00 6.00a
MS-DOS | OS/2
buglist6.00 buglist6.00a buglist6.00ax
Summary:
SYMPTOMS
In Microsoft C versions 6.0, 6.0a, and 6.0ax, the /u compiler
option turns off the definition of all predefined identifiers.
Therefore, other compiler options that implicitly define
identifiers are incompatible with /u. Nevertheless, no warnings or
errors are generated if an option incompatible with /u is
specified.
For example, the /MT option implicitly defines _MT, which is
necessary for multithreaded programming. If both /u and /MT are
specified, the /MT option is effectively ignored due to /u
undefining _MT.
STATUS
This is expected behavior. the /U (undefine) option turns off the
definition of any identifier that is already defined for the
preprocessor. The /u option turns off every defined identifier.
Both the /U and /u options apply to predefined names and user
defined ones.
Additional reference words: 6.00 6.00a 6.00ax