Incorrect C2129 Error Generated for Static Function

ID Number: Q34409

5.10 6.00 6.00a 6.00ax | 5.10 6.00 6.00a

MS-DOS | OS/2

buglist5.10 buglist6.00 buglist6.00a buglist6.00ax fixlist7.00

Summary:

SYMPTOMS

If the following conditions are true:

- Function "x" is given static storage

- There are two functions, y() and z(), calling y()

-or-

There is only one function calling it, but the /Za is used

- x() is prototyped inside y() and z() (block scope)

Microsoft C 5.1 generate the following output if /Ze is used:

C2129: static function 'x' not found

C4074: function given file scope

Microsoft C 5.1 generates the following if /Za is used:

C2129: static function 'x' not found

Microsoft C 6.0, 6.0a, 6.0ax will generate the following output if

/Ze is used:

C2129: static function 'x' not found

C4001: function given file scope

However, Microsoft C 6.0, 6.0a, 6.0ax generate the correct output

if /Za is used:

C2201: must be extern

CAUSE

ANSI does not permit a function prototype that has block scope to

have an explicit specifier other than extern. C4074 and C4001,

which indicate that the function has been given file scope to

remedy the situation, are warnings that are given if compiling with

/Ze. Error C2201 is generated if /Za is used, to indicate that the

function must be defined with extern as well. The generation of the

C2129 error is incorrect.

STATUS

Microsoft has confirmed this to be a problem in C version 5.1,

6.0, 6.0a, and 6.0ax. This problem was corrected in C/C++ version

7.0.

More Information:

C/C++ version 7.0 correctly gives the C4001 warning with /Ze, and

gives "C2201: cannot export static declarations" with /Za.

The sample program below demonstrates the problem. The problem does

not occur if any of the following are true:

- y() does not call x(), and /Ze is used

-or-

- The function prototypes for x() are given file scope

Sample Code:

------------

/* Compile options needed: /Ze -or- /Za, /W3 (5.1) or /W4 (> 5.1)

#include <stdio.h>

void y( void );

void y( )

{

static void x( char c ); /* C4074 / C4001 with /Ze only */

/* C 6.0: C2201 with /Za */

char c = 'y';

x( c ) ; /* C2129: C 5.1; C 6.0 with /Ze only */

}

void z( void );

void z( )

{

static void x( char c ); /* C4074 / C4001 with /Ze only */

/* C 6.0: C2201 with /Za */

char c = 'z';

x( c ); /* C 5.1: C2129 with /Za only */

}

static void x( char c )

{

printf( "%c\n", c );

}