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# mathfunc.m4 serial 12 |
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dnl Copyright (C) 2010-2023 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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# gl_MATHFUNC(FUNC, RETTYPE, PARAMTYPES [, INCLUDES] [, EXTRA-CODE]) |
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# |
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# tests whether the function FUNC is available in libc or libm. |
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# RETTYPE is the return type. PARAMTYPES is a parameter list, with parentheses. |
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# It sets FUNC_LIBM to empty or "-lm" accordingly. |
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AC_DEFUN([gl_MATHFUNC], |
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[ |
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dnl We need the RETTYPE and PARAMTYPES in order to force linking with the |
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dnl function. |
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dnl 1) With gcc >= 4.3 on glibc/x86_64, calls to the 'fabs' function |
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dnl are inlined by the compiler, therefore linking of these calls does |
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dnl not require -lm, but taking the function pointer of 'fabs' does. |
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dnl 2) On MSVC 9, many math functions exist only as macros with arguments, |
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dnl whereas the function pointer is undefined. |
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dnl On the other hand, taking just the function pointer is not enough. |
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dnl 1) On AIX 7.1, when 'long double' is 128 bit large ("xlc -qldbl128" or |
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dnl "xlc -qlongdouble" or "gcc -mlong-double-128") many math functions |
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dnl exist as macros with arguments, that may reference libm or even |
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dnl completely undefined functions such as __rint128. |
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dnl 2) In AIX 7.1 with gcc 4.2, when optimization is turned on, calls to |
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dnl rint() with simple arguments are turned into rintf() calls by the |
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dnl compiler. But while rint() is resides in libc, rintf() is in libm. |
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m4_pushdef([func], [$1]) |
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m4_pushdef([FUNC], [m4_translit([$1],[abcdefghijklmnopqrstuvwxyz], |
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ])]) |
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m4_pushdef([ARGS], [m4_bpatsubst( |
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[m4_bpatsubst( |
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[m4_bpatsubst( |
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[m4_bpatsubst( |
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[m4_bpatsubst( |
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[m4_bpatsubst( |
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[m4_bpatsubst( |
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[m4_bpatsubst( |
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[m4_bpatsubst( |
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[$3], |
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[int \*], [&i_ret])], |
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[float \*], [&f_ret])], |
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[double \*], [&d_ret])], |
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[long double \*], [&l_ret])], |
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[int], [2])], |
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[float], [1.618034f])], |
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[long double], [1.618033988749894848L])], |
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[double], [1.6180339887])], |
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[void], [])]) |
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FUNC[]_LIBM= |
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AC_CACHE_CHECK([whether func() can be used without linking with libm], |
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[gl_cv_func_]func[_no_libm], |
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[ |
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AC_LINK_IFELSE( |
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[AC_LANG_PROGRAM( |
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[[#ifndef __NO_MATH_INLINES |
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# define __NO_MATH_INLINES 1 |
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#endif |
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#include <math.h> |
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$4 |
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$2 (* volatile funcptr) $3 = ]func[; |
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int i_ret; |
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float f_ret; |
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double d_ret; |
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long double l_ret;]], |
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[[$2 y = funcptr ]ARGS[ + ]func[ ]ARGS[; |
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$5 |
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return y < 0.3 || y > 1.7; |
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]])], |
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[gl_cv_func_]func[_no_libm=yes], |
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[gl_cv_func_]func[_no_libm=no]) |
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]) |
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if test $gl_cv_func_[]func[]_no_libm = no; then |
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AC_CACHE_CHECK([whether func() can be used with libm], |
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[gl_cv_func_]func[_in_libm], |
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[ |
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save_LIBS="$LIBS" |
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LIBS="$LIBS -lm" |
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AC_LINK_IFELSE( |
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[AC_LANG_PROGRAM( |
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[[#ifndef __NO_MATH_INLINES |
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# define __NO_MATH_INLINES 1 |
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#endif |
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#include <math.h> |
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$4 |
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$2 (* volatile funcptr) $3 = ]func[; |
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int i_ret; |
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float f_ret; |
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double d_ret; |
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long double l_ret;]], |
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[[$2 y = funcptr ]ARGS[ + ]func[ ]ARGS[; |
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$5 |
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return y < 0.3 || y > 1.7; |
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]])], |
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[gl_cv_func_]func[_in_libm=yes], |
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[gl_cv_func_]func[_in_libm=no]) |
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LIBS="$save_LIBS" |
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]) |
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if test $gl_cv_func_[]func[]_in_libm = yes; then |
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FUNC[]_LIBM=-lm |
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fi |
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fi |
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AC_SUBST(FUNC[_LIBM]) |
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m4_popdef([ARGS]) |
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m4_popdef([FUNC]) |
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m4_popdef([func]) |
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]) |
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# gl_COMMON_DOUBLE_MATHFUNC(FUNC) |
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# |
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# tests whether the function FUNC is available in libc or libm. |
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# It sets FUNC_LIBM to empty or "-lm" accordingly. |
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# FUNC must be one of the following functions, that are present on all systems |
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# and provided by libm on all systems except Mac OS X, BeOS, Haiku: |
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# acos asin atan atan2 cbrt cos cosh erf erfc exp fmod hypot j0 j1 jn lgamma |
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# log log10 log1p pow remainder sin sinh sqrt tan tanh y0 y1 yn |
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AC_DEFUN([gl_COMMON_DOUBLE_MATHFUNC], |
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[ |
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AC_REQUIRE([gl_COMMON_DOUBLE_MATHFUNC_TEST]) |
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m4_pushdef([FUNC], [m4_translit([$1],[abcdefghijklmnopqrstuvwxyz], |
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ])]) |
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FUNC[]_LIBM="$POW_LIBM" |
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AC_SUBST(FUNC[_LIBM]) |
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m4_popdef([FUNC]) |
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]) |
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AC_DEFUN([gl_COMMON_DOUBLE_MATHFUNC_TEST], |
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[ |
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dnl We could use any of the following: |
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dnl gl_MATHFUNC([acos], [double], [(double)]) |
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dnl gl_MATHFUNC([asin], [double], [(double)]) |
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dnl gl_MATHFUNC([atan], [double], [(double)]) |
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dnl gl_MATHFUNC([atan2], [double], [(double, double)]) |
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dnl gl_MATHFUNC([cbrt], [double], [(double)]) |
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dnl gl_MATHFUNC([cos], [double], [(double)]) |
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dnl gl_MATHFUNC([cosh], [double], [(double)]) |
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dnl gl_MATHFUNC([erf], [double], [(double)]) |
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dnl gl_MATHFUNC([erfc], [double], [(double)]) |
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dnl gl_MATHFUNC([exp], [double], [(double)]) |
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dnl gl_MATHFUNC([fmod], [double], [(double, double)]) |
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dnl gl_MATHFUNC([hypot], [double], [(double, double)]) |
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dnl gl_MATHFUNC([j0], [double], [(double)]) |
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dnl gl_MATHFUNC([j1], [double], [(double)]) |
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dnl gl_MATHFUNC([jn], [double], [(int, double)]) |
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dnl gl_MATHFUNC([lgamma], [double], [(double)]) |
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dnl gl_MATHFUNC([log], [double], [(double)]) |
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dnl gl_MATHFUNC([log10], [double], [(double)]) |
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dnl gl_MATHFUNC([log1p], [double], [(double)]) |
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dnl gl_MATHFUNC([pow], [double], [(double, double)]) |
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dnl gl_MATHFUNC([remainder], [double], [(double, double)]) |
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dnl gl_MATHFUNC([sin], [double], [(double)]) |
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dnl gl_MATHFUNC([sinh], [double], [(double)]) |
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dnl gl_MATHFUNC([sqrt], [double], [(double)]) |
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dnl gl_MATHFUNC([tan], [double], [(double)]) |
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dnl gl_MATHFUNC([tanh], [double], [(double)]) |
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dnl gl_MATHFUNC([y0], [double], [(double)]) |
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dnl gl_MATHFUNC([y1], [double], [(double)]) |
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dnl gl_MATHFUNC([yn], [double], [(int, double)]) |
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gl_MATHFUNC([pow], [double], [(double, double)]) |
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]) |
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