kc3-lang/gnulib/m4/exp2f.m4

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

  maint: run 'make update-copyright'
  

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• m4/exp2f.m4

• # exp2f.m4 serial 1
  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_EXP2F],
  [
    AC_REQUIRE([gl_MATH_H_DEFAULTS])
    AC_REQUIRE([gl_FUNC_EXP2])
  
    dnl Persuade glibc <math.h> to declare exp2f().
    AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  
    dnl Test whether exp2f() exists. Assume that exp2f(), if it exists, is
    dnl defined in the same library as exp2().
    save_LIBS="$LIBS"
    LIBS="$LIBS $EXP2_LIBM"
    AC_CHECK_FUNCS([exp2f])
    LIBS="$save_LIBS"
    if test $ac_cv_func_exp2f = yes; then
      HAVE_EXP2F=1
      EXP2F_LIBM="$EXP2_LIBM"
      dnl Also check whether it's declared.
      dnl IRIX 6.5 has exp2f() in libm but doesn't declare it in <math.h>.
      AC_CHECK_DECL([exp2f], , [HAVE_DECL_EXP2F=0], [[#include <math.h>]])
    else
      HAVE_EXP2F=0
      HAVE_DECL_EXP2F=0
      dnl Find libraries needed to link lib/exp2f.c.
      EXP2F_LIBM="$EXP2_LIBM"
    fi
    AC_SUBST([EXP2F_LIBM])
  ])
  

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