Fix HAVE_REALLOC_POSIX misnomer.

[gnulib.git] / m4 / mathfunc.m4

diff --git a/m4/mathfunc.m4 b/m4/mathfunc.m4
index 8d9d826..f6e091b 100644 (file)
--- a/m4/mathfunc.m4
+++ b/m4/mathfunc.m4
@@ -1,18 +1,24 @@
-# mathfunc.m4 serial 1
+# mathfunc.m4 serial 4
 dnl Copyright (C) 2010 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([sqrt])
-# tests whether the sqrt function is available in libc or libm. It sets
-# SQRT_LIBM to empty or "-lm" accordingly.
+# gl_MATHFUNC(FUNC, RETTYPE, PARAMTYPES)
+# --------------------------------------------------
+# 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.
 
 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.
   m4_pushdef([func], [$1])
-  m4_pushdef([FUNC], [translit([$1],[abcdefghijklmnopqrstuvwxyz],
-                                    [ABCDEFGHIJKLMNOPQRSTUVWXYZ])])
+  m4_pushdef([FUNC], [m4_translit([$1],[abcdefghijklmnopqrstuvwxyz],
+                                       [ABCDEFGHIJKLMNOPQRSTUVWXYZ])])
   FUNC[]_LIBM=
   AC_CACHE_CHECK([whether func() can be used without linking with libm],
     [gl_cv_func_]func[_no_libm],
@@ -22,8 +28,8 @@ AC_DEFUN([gl_MATHFUNC],
                            # define __NO_MATH_INLINES 1 /* for glibc */
                            #endif
                            #include <math.h>
-                           double x;]],
-                         [[return ]func[ (x) > 2 || ]func[ (x) < 0.4;]])],
+                           $2 (*funcptr) $3 = ]func[;]],
+                         [[return 0;]])],
         [gl_cv_func_]func[_no_libm=yes],
         [gl_cv_func_]func[_no_libm=no])
     ])
@@ -38,8 +44,8 @@ AC_DEFUN([gl_MATHFUNC],
                              # define __NO_MATH_INLINES 1 /* for glibc */
                              #endif
                              #include <math.h>
-                             double x;]],
-                           [[return ]func[ (x) > 2 || ]func[ (x) < 0.4;]])],
+                             $2 (*funcptr) $3 = ]func[;]],
+                           [[return 0;]])],
           [gl_cv_func_]func[_in_libm=yes],
           [gl_cv_func_]func[_in_libm=no])
         LIBS="$save_LIBS"
@@ -48,6 +54,62 @@ AC_DEFUN([gl_MATHFUNC],
       FUNC[]_LIBM=-lm
     fi
   fi
+  AC_SUBST(FUNC[_LIBM])
   m4_popdef([FUNC])
   m4_popdef([func])
 ])
+
+# gl_COMMON_DOUBLE_MATHFUNC(FUNC)
+# -------------------------------
+# 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:
+#   acos asin atan atan2 cbrt copysign cos cosh erf erfc exp fmod hypot j0 j1
+#   jn lgamma log log10 log1p pow remainder sin sinh sqrt tan tanh y0 y1 yn
+
+AC_DEFUN([gl_COMMON_DOUBLE_MATHFUNC],
+[
+  AC_REQUIRE([gl_COMMON_DOUBLE_MATHFUNC_TEST])
+  m4_pushdef([FUNC], [m4_translit([$1],[abcdefghijklmnopqrstuvwxyz],
+                                       [ABCDEFGHIJKLMNOPQRSTUVWXYZ])])
+  FUNC[]_LIBM="$POW_LIBM"
+  AC_SUBST(FUNC[_LIBM])
+  m4_popdef([FUNC])
+])
+
+AC_DEFUN([gl_COMMON_DOUBLE_MATHFUNC_TEST],
+[
+  dnl We could use any of the following:
+  dnl gl_MATHFUNC([acos], [double], [(double)])
+  dnl gl_MATHFUNC([asin], [double], [(double)])
+  dnl gl_MATHFUNC([atan], [double], [(double)])
+  dnl gl_MATHFUNC([atan2], [double], [(double, double)])
+  dnl gl_MATHFUNC([cbrt], [double], [(double)])
+  dnl gl_MATHFUNC([copysign], [double], [(double, double)])
+  dnl gl_MATHFUNC([cos], [double], [(double)])
+  dnl gl_MATHFUNC([cosh], [double], [(double)])
+  dnl gl_MATHFUNC([erf], [double], [(double)])
+  dnl gl_MATHFUNC([erfc], [double], [(double)])
+  dnl gl_MATHFUNC([exp], [double], [(double)])
+  dnl gl_MATHFUNC([fmod], [double], [(double, double)])
+  dnl gl_MATHFUNC([hypot], [double], [(double, double)])
+  dnl gl_MATHFUNC([j0], [double], [(double)])
+  dnl gl_MATHFUNC([j1], [double], [(double)])
+  dnl gl_MATHFUNC([jn], [double], [(int, double)])
+  dnl gl_MATHFUNC([lgamma], [double], [(double)])
+  dnl gl_MATHFUNC([log], [double], [(double)])
+  dnl gl_MATHFUNC([log10], [double], [(double)])
+  dnl gl_MATHFUNC([log1p], [double], [(double)])
+  dnl gl_MATHFUNC([pow], [double], [(double, double)])
+  dnl gl_MATHFUNC([remainder], [double], [(double, double)])
+  dnl gl_MATHFUNC([sin], [double], [(double)])
+  dnl gl_MATHFUNC([sinh], [double], [(double)])
+  dnl gl_MATHFUNC([sqrt], [double], [(double)])
+  dnl gl_MATHFUNC([tan], [double], [(double)])
+  dnl gl_MATHFUNC([tanh], [double], [(double)])
+  dnl gl_MATHFUNC([y0], [double], [(double)])
+  dnl gl_MATHFUNC([y1], [double], [(double)])
+  dnl gl_MATHFUNC([yn], [double], [(int, double)])
+  gl_MATHFUNC([pow], [double], [(double, double)])
+])