man/man7/feature_test_macros.7: Drop _ISOC9X_SOURCE

_ISOC9X_SOURCE was a temporary macro for use before the final name
of the standard was known.  It became obsolete when _ISOC99_SOURCE
was added in glibc 2.1.3 (1999), and has not been recognized since
_ISOC11_SOURCE was added in glibc 2.16 (2012).[1]

[1] <https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=d78099052b6b>

Signed-off-by: Mark Harris <mark.hsj@gmail.com>
Message-ID: <bf785830f727b9fd7a40001b861b743f88fe2a7a.1769581651.git.mark.hsj@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

diff --git a/man/man7/feature_test_macros.7 b/man/man7/feature_test_macros.7
index ddb66465e2b142310a17d186a75815dc30267104..469e97310ab2a623a9f2213861ecd35ccd628516 100644 (file)
--- a/man/man7/feature_test_macros.7
+++ b/man/man7/feature_test_macros.7
@@ -334,16 +334,7 @@ SYNOPSIS in man pages.
 .TP
 .BR _ISOC99_SOURCE " (since glibc 2.1.3)"
 Exposes declarations consistent with the ISO C99 standard.
-.IP
-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-Although the use of this macro is obsolete, glibc continues
-to recognize it for backward compatibility.
-.IP
-Defining
-.B _ISOC99_SOURCE
-also exposes ISO C (1990) Amendment 1 ("C95") definitions.
+Defining this macro also exposes ISO C (1990) Amendment 1 ("C95") definitions.
 (The primary change in C95 was support for international character sets.)
 .IP
 Invoking the C compiler with the option