kc3-lang/gnulib/m4/tanhf.m4

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• m4/tanhf.m4

• # tanhf.m4 serial 3
  dnl Copyright (C) 2011-2023 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.
  
  AC_DEFUN([gl_FUNC_TANHF],
  [
    AC_REQUIRE([gl_MATH_H_DEFAULTS])
    AC_REQUIRE([gl_FUNC_TANH])
  
    dnl Persuade glibc <math.h> to declare tanhf().
    AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  
    dnl Test whether tanhf() exists. Assume that tanhf(), if it exists, is
    dnl defined in the same library as tanh().
    save_LIBS="$LIBS"
    LIBS="$LIBS $TANH_LIBM"
    AC_CHECK_FUNCS([tanhf])
    LIBS="$save_LIBS"
    if test $ac_cv_func_tanhf = yes; then
      TANHF_LIBM="$TANH_LIBM"
    else
      HAVE_TANHF=0
      dnl If the function is declared but does not appear to exist, it may be
      dnl defined as an inline function. In order to avoid a conflict, we have
      dnl to define rpl_tanhf, not tanhf.
      AC_CHECK_DECLS([tanhf], [REPLACE_TANHF=1], , [[#include <math.h>]])
      TANHF_LIBM="$TANH_LIBM"
    fi
    AC_SUBST([TANHF_LIBM])
  ])
  

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