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feature_test_macros.7: Rework discussion of _ISOC99_SOURCE 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2014-03-11 08:44:26 +01:00
parent 2b4608d288
commit df553d91c2
1 changed files with 4 additions and 4 deletions
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man7/feature_test_macros.7
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@ -251,13 +251,13 @@ The C95 changes were included in the subsequent C99 standard
implies
.BR _ISOC95_SOURCE ).
.TP
.B _ISOC99_SOURCE
.BR _ISOC99_SOURCE " (since glibc 2.1.3)"
Exposes C99 extensions to ISO C (1990).
This macro is recognized since glibc 2.1.3;
earlier glibc 2.1.x versions recognized an equivalent macro named
Earlier glibc 2.1.x versions recognized an equivalent macro named
.B _ISOC9X_SOURCE
(because the C99 standard had not then been finalized).
Although the use of the latter macro is obsolete, glibc continues
Although the use of this macro is obsolete, glibc continues
to recognize it for backward compatibility.
.TP
.BR _ISOC11_SOURCE " (since glibc 2.16)"