Home | History | Annotate | Line # | Download | only in m4 
      1 # sys_uio_h.m4 serial 3
      2 dnl Copyright (C) 2011-2022 Free Software Foundation, Inc.
      3 dnl This file is free software; the Free Software Foundation
      4 dnl gives unlimited permission to copy and/or distribute it,
      5 dnl with or without modifications, as long as this notice is preserved.
      6 
      7 AC_DEFUN_ONCE([gl_SYS_UIO_H],
      8 [
      9   AC_REQUIRE([gl_SYS_UIO_H_DEFAULTS])
     10   dnl <sys/uio.h> is always overridden, because of GNULIB_POSIXCHECK.
     11   gl_CHECK_NEXT_HEADERS([sys/uio.h])
     12   if test $ac_cv_header_sys_uio_h = yes; then
     13     HAVE_SYS_UIO_H=1
     14   else
     15     HAVE_SYS_UIO_H=0
     16   fi
     17   AC_SUBST([HAVE_SYS_UIO_H])
     18 ])
     19 
     20 # gl_SYS_UIO_MODULE_INDICATOR([modulename])
     21 # sets the shell variable that indicates the presence of the given module
     22 # to a C preprocessor expression that will evaluate to 1.
     23 # This macro invocation must not occur in macros that are AC_REQUIREd.
     24 AC_DEFUN([gl_SYS_UIO_MODULE_INDICATOR],
     25 [
     26   dnl Ensure to expand the default settings once only.
     27   gl_SYS_UIO_H_REQUIRE_DEFAULTS
     28   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
     29   dnl Define it also as a C macro, for the benefit of the unit tests.
     30   gl_MODULE_INDICATOR_FOR_TESTS([$1])
     31 ])
     32 
     33 # Initializes the default values for AC_SUBSTed shell variables.
     34 # This macro must not be AC_REQUIREd.  It must only be invoked, and only
     35 # outside of macros or in macros that are not AC_REQUIREd.
     36 AC_DEFUN([gl_SYS_UIO_H_REQUIRE_DEFAULTS],
     37 [
     38   m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_UIO_H_MODULE_INDICATOR_DEFAULTS], [
     39   ])
     40   m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_UIO_H_MODULE_INDICATOR_DEFAULTS])
     41   AC_REQUIRE([gl_SYS_UIO_H_DEFAULTS])
     42 ])
     43 
     44 AC_DEFUN([gl_SYS_UIO_H_DEFAULTS],
     45 [
     46 ])
     47