AN3350 datasheet(150/185 Pages) STMICROELECTRONICS

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Pragmas for diagnostic messages

AN3350

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Doc ID 018512 Rev 2

int main()

{

f = si; /* WARNING */

si = f; /* WARNING */

ui = si; /* WARNING */

si = ui; /* WARNING */

}

Note:

This option “opens the gate” for the checking of implicit conversions. The sub-pragmas

warn_impl_f2i_conv

, warn_impl_i2f_conv, and warn_impl_s2u_conv control the

classes of conversions checked.

By default, this pragma is off.

19.24

warn_largeargs

Controls the issuing of warning messages for passing non-”int” numeric values to

unprototyped functions.

Syntax

#pragma warn_largeargs on | off | reset

Remarks

If you enable this pragma, the compiler issues a warning message if you attempt to pass a

non-integer numeric value, such as a float or long long, to an unprototyped function

when the require_prototypes pragma is disabled.

This pragma does not correspond to any panel setting. By default, this pragma is off.

19.25

warn_missingreturn

Issues a warning message when a function that returns a value is missing a return

statement.

Syntax

#pragma warn_missingreturn on | off | reset

Remarks

An example is shown in Example 98.

Example 98 Example of warn_missingreturn pragma

#pragma warn_missingreturn on

int func()

{

/* WARNING: no return statement. */

}

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