Specifications

CAVR-4
Part 2. Compiler reference
Pragma directives
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#pragma diag_warning #pragma diag_warning=tag,tag,...
Changes the severity level to warning for the specified diagnostics. For example:
#pragma diag_warning=Pe826
See the chapter Diagnostics for more information about diagnostic messages.
#pragma include_alias #pragma include_alias "orig_header" "subst_header"
#pragma include_alias <orig_header> <subst_header>
The #pragma include_alias directive makes it possible to provide an alias for a
header file. This is useful for substituting one header file with another, and for
specifying an absolute path to a relative file.
The parameter
subst_header is used for specifying an alias for orig_header. This
pragma directive must appear before the corresponding
#include directives and
subst_header must match its corresponding #include directive exactly.
Example
#pragma include_alias <stdio.h> <C:\MyHeaders\stdio.h>
#include <stdio.h>
This example will substitute the relative file stdio.h with a counterpart located
according to the specified path.
#pragma inline #pragma inline[=forced]
The #pragma inline directive advises the compiler that the function whose
declaration follows immediately after the directive should be inlined—that is, expanded
into the body of the calling function. Whether the inlining actually takes place is subject
to the compiler’s heuristics.
This is similar to the C++ keyword inline, but has the advantage of being available in
C code.
Specifying
#pragma inline=forced disables the compiler’s heuristics and forces the
inlining. If the inlining fails for some reason, for example if it cannot be used with the
function type in question (like
printf), an error message is emitted.