How can I conditionally include #ident directives in a macro?

A bug in gcc-4.4 causes the #ident directive to emit a warning. We don't allow warnings in our compiler (-Werror) so I need to turn these off when compiled on certain GCC compiler versions. (See Best replacement for GCC #ident)

$ echo '#ident "FAILS on gcc-4.3.3"' > test.c
$ gcc-4.4 -c test.c
test.c:1: warning: #ident is a deprecated GCC extension

Since these occur in several locations I want to replace them with a macro which would conditionally emit either nothing (or something that approximates #ident) on those "bad" compilers or with the actual #ident directive on all others. Ideally, something like this:

# test2.c
#ifndef HAS_HASH_IDENT
#  define IDENT(x) //-- NO-OP
#else
#  define IDENT(x) #ident x
#endif

This doesn't work because the preprocessor chokes on the # of #ident, as it is interpreted as the stringize operator when used in a macro.

$ gcc-4.5 -Wall -E test2.c
test2.c:4:22: error: '#' is开发者_如何学编程 not followed by a macro parameter

I tried several macro redirection tricks, but nothing I came up with would satisfy the preprocessor.

Is something like this even possible?

Note: The #ident directive is passed on intact to the compiler by the preprocessor, so the problem I'm having is not restricted by some sort of preprocessor recursion limitation.

$ gcc-4.5 -E test.c         
# 1 "test.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "test.c"
#ident "FAILS on gcc-4.3.3"

Perhaps you just want to use this option

-fno-ident Ignore the #ident directive.

maybe this switches off the warning, too.

Have you tried selectively muting that specific warning? Something along the lines of https://stackoverflow.com/a/3125889/2003487