doc: use ASCII in .texi files where UTF-8 isn't needed

[gnulib.git] / m4 / mathfunc.m4

diff --git a/m4/mathfunc.m4 b/m4/mathfunc.m4
index 698e188..6f0e6aa 100644 (file)
--- a/m4/mathfunc.m4
+++ b/m4/mathfunc.m4
@@ -1,11 +1,11 @@
-# mathfunc.m4 serial 8
-dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
+# mathfunc.m4 serial 11
+dnl Copyright (C) 2010-2014 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-# gl_MATHFUNC(FUNC, RETTYPE, PARAMTYPES)
-# --------------------------------------------------
+# gl_MATHFUNC(FUNC, RETTYPE, PARAMTYPES [, INCLUDES] [, EXTRA-CODE])
+# ------------------------------------------------------------------
 # tests whether the function FUNC is available in libc or libm.
 # RETTYPE is the return type. PARAMTYPES is a parameter list, with parentheses.
 # It sets FUNC_LIBM to empty or "-lm" accordingly.
@@ -13,9 +13,20 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_MATHFUNC],
 [
   dnl We need the RETTYPE and PARAMTYPES in order to force linking with the
-  dnl function. With gcc >= 4.3 on glibc/x86_64, calls to the 'fabs' function
-  dnl are inlined by the compiler, therefore linking of these calls does not
-  dnl require -lm, but taking the function pointer of 'fabs' does.
+  dnl function.
+  dnl 1) With gcc >= 4.3 on glibc/x86_64, calls to the 'fabs' function
+  dnl    are inlined by the compiler, therefore linking of these calls does
+  dnl    not require -lm, but taking the function pointer of 'fabs' does.
+  dnl 2) On MSVC 9, many math functions exist only as macros with arguments,
+  dnl    whereas the function pointer is undefined.
+  dnl On the other hand, taking just the function pointer is not enough.
+  dnl 1) On AIX 7.1, when 'long double' is 128 bit large ("xlc -qldbl128" or
+  dnl    "xlc -qlongdouble" or "gcc -mlong-double-128") many math functions
+  dnl    exist as macros with arguments, that may reference libm or even
+  dnl    completely undefined functions such as __rint128.
+  dnl 2) In AIX 7.1 with gcc 4.2, when optimization is turned on, calls to
+  dnl    rint() with simple arguments are turned into rintf() calls by the
+  dnl    compiler. But while rint() is resides in libc, rintf() is in libm.
   m4_pushdef([func], [$1])
   m4_pushdef([FUNC], [m4_translit([$1],[abcdefghijklmnopqrstuvwxyz],
                                        [ABCDEFGHIJKLMNOPQRSTUVWXYZ])])
@@ -27,15 +38,17 @@ AC_DEFUN([gl_MATHFUNC],
                                     [m4_bpatsubst(
                                        [m4_bpatsubst(
                                           [m4_bpatsubst(
-                                             [$3],
-                                             [int \*], [&i_ret])],
-                                          [float \*], [&f_ret])],
-                                       [double \*], [&d_ret])],
-                                    [long double \*], [&l_ret])],
-                                 [int], [2])],
-                              [float], [1.618034f])],
-                           [long double], [1.618033988749894848L])],
-                        [double], [1.6180339887])])
+                                             [m4_bpatsubst(
+                                                [$3],
+                                                [int \*], [&i_ret])],
+                                             [float \*], [&f_ret])],
+                                          [double \*], [&d_ret])],
+                                       [long double \*], [&l_ret])],
+                                    [int], [2])],
+                                 [float], [1.618034f])],
+                              [long double], [1.618033988749894848L])],
+                           [double], [1.6180339887])],
+                        [void], [])])
   FUNC[]_LIBM=
   AC_CACHE_CHECK([whether func() can be used without linking with libm],
     [gl_cv_func_]func[_no_libm],
@@ -46,12 +59,14 @@ AC_DEFUN([gl_MATHFUNC],
              # define __NO_MATH_INLINES 1 /* for glibc */
              #endif
              #include <math.h>
+             $4
              $2 (*funcptr) $3 = ]func[;
              int i_ret;
              float f_ret;
              double d_ret;
              long double l_ret;]],
-           [[$2 y = funcptr ]ARGS[;
+           [[$2 y = funcptr ]ARGS[ + ]func[ ]ARGS[;
+             $5
              return y < 0.3 || y > 1.7;
            ]])],
         [gl_cv_func_]func[_no_libm=yes],
@@ -69,12 +84,14 @@ AC_DEFUN([gl_MATHFUNC],
                # define __NO_MATH_INLINES 1 /* for glibc */
                #endif
                #include <math.h>
+               $4
                $2 (*funcptr) $3 = ]func[;
                int i_ret;
                float f_ret;
                double d_ret;
                long double l_ret;]],
-             [[$2 y = funcptr ]ARGS[;
+             [[$2 y = funcptr ]ARGS[ + ]func[ ]ARGS[;
+               $5
                return y < 0.3 || y > 1.7;
              ]])],
           [gl_cv_func_]func[_in_libm=yes],
@@ -96,7 +113,7 @@ AC_DEFUN([gl_MATHFUNC],
 # tests whether the function FUNC is available in libc or libm.
 # It sets FUNC_LIBM to empty or "-lm" accordingly.
 # FUNC must be one of the following functions, that are present on all systems
-# and provided by libm on all systems except MacOS X, BeOS, Haiku:
+# and provided by libm on all systems except Mac OS X, BeOS, Haiku:
 #   acos asin atan atan2 cbrt cos cosh erf erfc exp fmod hypot j0 j1 jn lgamma
 #   log log10 log1p pow remainder sin sinh sqrt tan tanh y0 y1 yn