-# mathfunc.m4 serial 1
-dnl Copyright (C) 2010 Free Software Foundation, Inc.
+# mathfunc.m4 serial 6
+dnl Copyright (C) 2010-2011 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],
[
AC_LINK_IFELSE(
- [AC_LANG_PROGRAM([[#ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- double x;]],
- [[return ]func[ (x) > 2 || ]func[ (x) < 0.4;]])],
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ $2 (*funcptr) $3 = ]func[;
+ double d_ret;]],
+ [[$2 y = funcptr ]m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([$3], [int], [2])], [double \*], [&d_ret])], [double], [1.6180339887])[;
+ return y < 0.3 || y > 1.7;
+ ]])],
[gl_cv_func_]func[_no_libm=yes],
[gl_cv_func_]func[_no_libm=no])
])
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_LINK_IFELSE(
- [AC_LANG_PROGRAM([[#ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- double x;]],
- [[return ]func[ (x) > 2 || ]func[ (x) < 0.4;]])],
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ $2 (*funcptr) $3 = ]func[;
+ double d_ret;]],
+ [[$2 y = funcptr ]m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([$3], [int], [2])], [double \*], [&d_ret])], [double], [1.6180339887])[;
+ return y < 0.3 || y > 1.7;
+ ]])],
[gl_cv_func_]func[_in_libm=yes],
[gl_cv_func_]func[_in_libm=no])
LIBS="$save_LIBS"
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 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([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)])
+])
projects / gnulib.git / blobdiff