Rainer Tammer wrote:
> # ./testme
> acos requires libm
> asin requires libm
> atan requires libm
> atan2 requires libm
> cbrt requires libm
> copysign requires libm
> cos requires libm
> cosh requires libm
> erf requires libm
> erfc requires libm
> exp requires libm
> fmod requires libm
> hypot requires libm
> j0 requires libm
> j1 requires libm
> jn requires libm
> lgamma requires libm
> log requires libm
> log10 requires libm
> log1p requires libm
> pow requires libm
> remainder requires libm
> sin requires libm
> sinh requires libm
> sqrt requires libm
> tan requires libm
> tanh requires libm
> y0 requires libm
> y1 requires libm
> yn requires libm
Ah! This makes much more sense, now. So I conclude that the xlc compiler (or
its linker) was optimizing away the 'funcptr' variable. This should fix it:
2010-07-31 Bruno Haible <br...@clisp.org>
Correctly determine whether pow is available in libc on AIX 7 with xlc.
* m4/mathfunc.m4 (gl_MATHFUNC): Actually use the 'funcptr' variable.
This disables an xlc optimization that was causing wrong test results.
Reported by Rainer Tammer.
--- m4/mathfunc.m4.orig Sat Jul 31 13:58:20 2010
+++ m4/mathfunc.m4 Sat Jul 31 13:57:38 2010
@@ -1,4 +1,4 @@
-# mathfunc.m4 serial 5
+# mathfunc.m4 serial 6
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,
@@ -24,12 +24,15 @@
[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>
- $2 (*funcptr) $3 = ]func[;]],
- [[return 0;]])],
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ $2 (*funcptr) $3 = ]func[;]],
+ [[$2 y = funcptr ]m4_bpatsubst([m4_bpatsubst([$3], [int], [2])],
[double], [1.6180339887])[;
+ return y < 0.3 || y > 1.7;
+ ]])],
[gl_cv_func_]func[_no_libm=yes],
[gl_cv_func_]func[_no_libm=no])
])
@@ -40,12 +43,15 @@
save_LIBS="$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>
- $2 (*funcptr) $3 = ]func[;]],
- [[return 0;]])],
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ $2 (*funcptr) $3 = ]func[;]],
+ [[$2 y = funcptr ]m4_bpatsubst([m4_bpatsubst([$3], [int], [2])],
[double], [1.6180339887])[;
+ return y < 0.3 || y > 1.7;
+ ]])],
[gl_cv_func_]func[_in_libm=yes],
[gl_cv_func_]func[_in_libm=no])
LIBS="$save_LIBS"
