Selectively disable GCC warnings for only part of a translation unit

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This is possible in GCC since version 4.6, or around June 2010 in the trunk.

Here’s an example:

#pragma GCC diagnostic push
#pragma GCC diagnostic error "-Wuninitialized"
    foo(a);         /* error is given for this one */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wuninitialized"
    foo(b);         /* no diagnostic for this one */
#pragma GCC diagnostic pop
    foo(c);         /* error is given for this one */
#pragma GCC diagnostic pop
    foo(d);         /* depends on command line options */

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