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a2a773992d
Without _GNU_SOURCE defined this file fails to compile with the
following error:
$ gcc manual/examples/twalk.c
manual/examples/twalk.c: In function ‘twalk’:
manual/examples/twalk.c:55:3: error: implicit declaration of function ‘twalk_r’; did you mean ‘twalk’? [-Wimplicit-function-declaration]
55 | twalk_r (root, twalk_with_twalk_r_action, &closure);
| ^~~~~~~
| twalk
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
These are source files for example code that appears in The GNU C Library Reference Manual. While the manual itself is licensed under the terms of the GNU Free Documentation License, you can use these source files on their own under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License, or (at your option) any later version.