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round: Don't override undeclared system function on IRIX 6.5.
* m4/check-math-lib.m4 (gl_CHECK_MATH_LIB): Accept an optional third argument. * m4/round.m4 (gl_FUNC_ROUND): Search for round() in the libraries also when it is not declared. Set HAVE_ROUND. For replacement code, test HAVE_ROUND, not HAVE_DECL_ROUND. * modules/round (configure.ac): For replacement code, test HAVE_ROUND, not HAVE_DECL_ROUND. (Depends-on): Update conditions. * modules/round-ieee (Depends-on): Update conditions. * doc/posix-functions/round.texi: Mention the IRIX problem.
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@@ -10,10 +10,10 @@ Portability problems fixed by either Gnulib module @code{round} or @code{round-i
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@itemize
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@item
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This function is missing on some platforms:
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FreeBSD 5.2.1, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, IRIX 6.5, OSF/1 4.0, Solaris 9, MSVC 9, Interix 3.5.
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FreeBSD 5.2.1, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, older IRIX 6.5, OSF/1 4.0, Solaris 9, MSVC 9, Interix 3.5.
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@item
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This function is not declared on some platforms:
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glibc 2.8, OSF/1 5.1.
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glibc 2.8, IRIX 6.5, OSF/1 5.1.
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@item
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This functions returns a wrong result for x = 1/2 - 2^-54 on some platforms:
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NetBSD 3.0, AIX 7.1.
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