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| 1 | #serial 3
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| 2 | # Make sure _GNU_SOURCE is defined where necessary: as early as possible
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| 3 | # for configure-time tests, as well as for every source file that includes
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| 4 | # config.h.
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| 5 |
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| 6 | # From Jim Meyering.
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| 7 |
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| 8 | AC_DEFUN([AC__GNU_SOURCE],
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| 9 | [
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| 10 | # Make sure that _GNU_SOURCE is defined for all subsequent
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| 11 | # configure-time compile tests.
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| 12 | # This definition must be emitted (into confdefs.h) before any
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| 13 | # test that involves compilation.
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| 14 | cat >>confdefs.h <<\EOF
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| 15 | #ifndef _GNU_SOURCE
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| 16 | # define _GNU_SOURCE
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| 17 | #endif
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| 18 | EOF
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| 19 |
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| 20 | # Emit this code into config.h.in.
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| 21 | # The ifndef is to avoid redefinition warnings.
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| 22 | AH_VERBATIM([_GNU_SOURCE], [#ifndef _GNU_SOURCE
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| 23 | # define _GNU_SOURCE
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| 24 | #endif])
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| 25 | ])
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