X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fmathfunc.m4;h=67b601fe424c7f64bfd5991812c1a777187314b5;hb=da8054d48dc22e1c051db54049e005d51a006e69;hp=da6dc5ffe00db6acfb5c4e659f6ce78b732f7504;hpb=579cd92ebf7e6c45259e041957042a7d9cf3ac26;p=gnulib.git diff --git a/m4/mathfunc.m4 b/m4/mathfunc.m4 index da6dc5ffe..67b601fe4 100644 --- a/m4/mathfunc.m4 +++ b/m4/mathfunc.m4 @@ -1,11 +1,11 @@ -# mathfunc.m4 serial 7 -dnl Copyright (C) 2010-2011 Free Software Foundation, Inc. +# mathfunc.m4 serial 11 +dnl Copyright (C) 2010-2013 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. @@ -13,12 +13,42 @@ 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])]) + m4_pushdef([ARGS], [m4_bpatsubst( + [m4_bpatsubst( + [m4_bpatsubst( + [m4_bpatsubst( + [m4_bpatsubst( + [m4_bpatsubst( + [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])], + [void], [])]) FUNC[]_LIBM= AC_CACHE_CHECK([whether func() can be used without linking with libm], [gl_cv_func_]func[_no_libm], @@ -29,12 +59,14 @@ AC_DEFUN([gl_MATHFUNC], # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include + $4 $2 (*funcptr) $3 = ]func[; int i_ret; float f_ret; double d_ret; long double l_ret;]], - [[$2 y = funcptr ]m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([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])[; + [[$2 y = funcptr ]ARGS[ + ]func[ ]ARGS[; + $5 return y < 0.3 || y > 1.7; ]])], [gl_cv_func_]func[_no_libm=yes], @@ -52,12 +84,14 @@ AC_DEFUN([gl_MATHFUNC], # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include + $4 $2 (*funcptr) $3 = ]func[; int i_ret; float f_ret; double d_ret; long double l_ret;]], - [[$2 y = funcptr ]m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([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])[; + [[$2 y = funcptr ]ARGS[ + ]func[ ]ARGS[; + $5 return y < 0.3 || y > 1.7; ]])], [gl_cv_func_]func[_in_libm=yes], @@ -69,6 +103,7 @@ AC_DEFUN([gl_MATHFUNC], fi fi AC_SUBST(FUNC[_LIBM]) + m4_popdef([ARGS]) m4_popdef([FUNC]) m4_popdef([func]) ]) @@ -78,7 +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