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| author | Bruno Haible <bruno@clisp.org> | 2011-10-10 02:29:53 +0200 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2011-10-10 02:29:53 +0200 |
| commit | 14c0eff67c28b3adafbb9a98424eec4a2714e0bb (patch) | |
| tree | 2d28a569934f2ac58eecfb0f8d17b2135bc3cfcb /m4/mathfunc.m4 | |
| parent | 1694a0f2eb5246bd59399e153d61e5ce0fa2bedd (diff) | |
| download | gnulib-14c0eff67c28b3adafbb9a98424eec4a2714e0bb.tar.gz | |
rint: Determine RINT_LIBM correctly on AIX 7.
* m4/mathfunc.m4 (gl_MATHFUNC): Try to invoke the function also
directly, not only through a function pointer. Also accept an optional
4th argument with extra code.
* m4/rint.m4 (gl_FUNC_RINT): Pass an extra code that gets turned into a
rintf() call by gcc when optimizing.
Diffstat (limited to 'm4/mathfunc.m4')
| -rw-r--r-- | m4/mathfunc.m4 | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/m4/mathfunc.m4 b/m4/mathfunc.m4 index 698e188512..b7a1239f74 100644 --- a/m4/mathfunc.m4 +++ b/m4/mathfunc.m4 @@ -1,11 +1,11 @@ -# mathfunc.m4 serial 8 +# mathfunc.m4 serial 9 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(FUNC, RETTYPE, PARAMTYPES) -# -------------------------------------------------- +# gl_MATHFUNC(FUNC, RETTYPE, PARAMTYPES [, 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])]) @@ -51,7 +62,8 @@ AC_DEFUN([gl_MATHFUNC], float f_ret; double d_ret; long double l_ret;]], - [[$2 y = funcptr ]ARGS[; + [[$2 y = funcptr ]ARGS[ + ]func[ ]ARGS[; + $4 return y < 0.3 || y > 1.7; ]])], [gl_cv_func_]func[_no_libm=yes], @@ -74,7 +86,8 @@ AC_DEFUN([gl_MATHFUNC], float f_ret; double d_ret; long double l_ret;]], - [[$2 y = funcptr ]ARGS[; + [[$2 y = funcptr ]ARGS[ + ]func[ ]ARGS[; + $4 return y < 0.3 || y > 1.7; ]])], [gl_cv_func_]func[_in_libm=yes], |