1# sys_uio_h.m4 serial 3 2dnl Copyright (C) 2011-2022 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7AC_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. 24AC_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. 36AC_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 44AC_DEFUN([gl_SYS_UIO_H_DEFAULTS], 45[ 46]) 47