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diff lib/math.in.h @ 16751:9d599e388a0f

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logb: Provide replacement and workarounds. * lib/math.in.h (logb): Ensure declaration. Replace if REPLACE_LOGB is 1. * lib/logb.c: New file. * m4/logb.m4 (gl_FUNC_LOGB_WORKS): New macro. (gl_FUNC_LOGB): Invoke it. Set HAVE_LOGB, REPLACE_LOGB. * m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize REPLACE_LOGB. * modules/math (Makefile.am): Substitute REPLACE_LOGB. * modules/logb (Files): Add lib/logb.c. (Depends-on): Add isfinite, frexp, isnand. (configure.ac): Compile the replacement code logb.c if needed. * tests/test-math-c++.cc: Check the declaration of logb. * doc/posix-functions/logb.texi: Mention the replacement and the bug with subnormal numbers.
author Bruno Haible <bruno@clisp.org>
date Tue, 03 Apr 2012 02:51:42 +0200 (2012-04-03)
parents 25dda52366fd
children 0f9a8ebc12c1
line wrap: on
line diff
--- a/lib/math.in.h
+++ b/lib/math.in.h
@@ -1108,19 +1108,6 @@
 #endif
 
 
-#if @GNULIB_LOGB@
-# if !@HAVE_DECL_LOGB@
-_GL_EXTERN_C double logb (double x);
-# endif
-#elif defined GNULIB_POSIXCHECK
-# undef logb
-# if HAVE_RAW_DECL_LOGB
-_GL_WARN_ON_USE (logb, "logb is unportable - "
-                 "use gnulib module logb for portability");
-# endif
-#endif
-
-
 #if @GNULIB_LOGF@
 # if @REPLACE_LOGF@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
@@ -1401,6 +1388,30 @@
 #endif
 
 
+#if @GNULIB_LOGB@
+# if @REPLACE_LOGB@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef logb
+#   define logb rpl_logb
+#  endif
+_GL_FUNCDECL_RPL (logb, double, (double x));
+_GL_CXXALIAS_RPL (logb, double, (double x));
+# else
+#  if !@HAVE_DECL_LOGB@
+_GL_FUNCDECL_SYS (logb, double, (double x));
+#  endif
+_GL_CXXALIAS_SYS (logb, double, (double x));
+# endif
+_GL_CXXALIASWARN (logb);
+#elif defined GNULIB_POSIXCHECK
+# undef logb
+# if HAVE_RAW_DECL_LOGB
+_GL_WARN_ON_USE (logb, "logb is unportable - "
+                 "use gnulib module logb for portability");
+# endif
+#endif
+
+
 #if @GNULIB_MODFF@
 # if @REPLACE_MODFF@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)