Q43535: ‘strerror’ Example in QuickC Manual May Yield Error

Article: Q43535
Product(s): See article
Version(s): 2.00
Operating System(s): MS-DOS
Keyword(s): ENDUSER | docerr | mspl13_c
Last Modified: 2-MAY-1989

The 'strerror' example given at the top of Page 582 of the "Microsoft
QuickC Run-Time Library Reference" may yield the following error:

   error C2086: 'errno' : redefinition

Two conditions are required to produce this error:

1. Compile for the compact- or large-memory model (/AC or /AL).

2. Compile without ANSI compatibility enforced (no /Za).

This error occurs because, under the above conditions, the external
reference has an implied 'far cdecl' and contradicts the external
reference in the include file ERRNO.H, as follows:

   extern int errno;

The external reference in the include file ERRNO.H is as follows:

   extern int near cdecl errno;

To correct this example, remove the following line:

   extern int errno;

This line is not necessary in any case because the external reference
to errno has already been made in ERRNO.H.

Only QuickC Version 2.00 will produce the above error as it is the
first Microsoft compiler to declare errno to be external in the
include file ERRNO.H.

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