# inline.m4 serial 4

dnl Copyright (C) 2006, 2009-2018 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.

dnl Test for the 'inline' keyword or equivalent.

dnl Define 'inline' to a supported equivalent, or to nothing if not supported,

dnl like AC_C_INLINE does.  Also, define HAVE_INLINE if 'inline' or an

dnl equivalent is effectively supported, i.e. if the compiler is likely to

dnl drop unused 'static inline' functions.

AC_DEFUN([gl_INLINE],

[

  AC_REQUIRE([AC_C_INLINE])

  AC_CACHE_CHECK([whether the compiler generally respects inline],

    [gl_cv_c_inline_effective],

    [if test $ac_cv_c_inline = no; then

       gl_cv_c_inline_effective=no

     else

       dnl GCC defines __NO_INLINE__ if not optimizing or if -fno-inline is

       dnl specified.

       dnl Use AC_COMPILE_IFELSE here, not AC_EGREP_CPP, because the result

       dnl depends on optimization flags, which can be in CFLAGS.

       dnl (AC_EGREP_CPP looks only at the CPPFLAGS.)

       AC_COMPILE_IFELSE(

         [AC_LANG_PROGRAM([[]],

           [[#ifdef __NO_INLINE__

               #error "inline is not effective"

             #endif]])],

         [gl_cv_c_inline_effective=yes],

         [gl_cv_c_inline_effective=no])

     fi

    ])

  if test $gl_cv_c_inline_effective = yes; then

    AC_DEFINE([HAVE_INLINE], [1],

      [Define to 1 if the compiler supports one of the keywords

       'inline', '__inline__', '__inline' and effectively inlines

       functions marked as such.])

  fi

])