BL51: Warning 16 (Uncalled Segment...) for Called Function

Information in this article applies to:

• C51 Version 5.50 and Later

SYMPTOMS

I have written a function called foo and it is called from the same source file. Here is the function:

void foo(void) { };

here is the function call:

if (x & B0)
{
  foo();
}

When I build my project I get the following warning:

Warning L16: Uncalled Segment, Ignored for Overlay Process

for the function foo. Why?

CAUSE

This can occur if the function call is unreachable. For example, if either x or B0 is defined as zero (

#define B0 0

) then the compiler sees this and optimizes out the if statement, as the code inside is unreachable. If there are no other calls to the function, then Warning 16 is generated.

RESOLUTION

There isn't much point writing code that is unreachable. Remove or modify the if statement.

MORE INFORMATION

• Refer to Warning L16 in the BL51 User's Guide.
• Refer to Warning L16 in the LX51 User's Guide.

SEE ALSO

• BL51: Warning L16 (Uncalled Segment, Ignored for Overlay)

Last Reviewed: Thursday, February 25, 2021