ID Number: Q67078
6.00 6.00a 6.00ax 7.00 | 6.00 6.00a
MS-DOS | OS/2
Summary:
In Microsoft C versions 6.0, 6.0a, 6.0ax, and C/C++ version 7.0,
different warning messages can appear from separate compilations of
the same code when different optimizations are used. This is normal
and occurs because some warnings are found only while optimizing.
If the sample code below is compiled with /W4 (all warnings) and the
/Os optimization (optimize for space), no warnings are found. However,
when the code is compiled with /W4 and /Osle (optimize for size, loop,
and global-register allocation), the following warning is generated:
file.c(7) : warning C4202: unreachable code
There are several other optimizations and code examples that will
exhibit this type of behavior. Once again, this is normal and serves
to notify the developer that there MAY be a problem.
Sample Code
-----------
1. #include <stdio.h>
2.
3. void main(void)
4. {
5. goto bottom;
6.
7. printf("Not used\n"); // Code that is not used
8.
9. bottom:printf("Hello World!");
10. }
Additional reference words: 6.00 6.00a 6.00ax 7.00