diff options
Diffstat (limited to 'm4/unistd_h.m4')
| -rw-r--r-- | m4/unistd_h.m4 | 33 |
1 files changed, 27 insertions, 6 deletions
diff --git a/m4/unistd_h.m4 b/m4/unistd_h.m4 index 9c77f9b..d38de90 100644 --- a/m4/unistd_h.m4 +++ b/m4/unistd_h.m4 @@ -1,5 +1,5 @@ -# unistd_h.m4 serial 2 -dnl Copyright (C) 2006 Free Software Foundation, Inc. +# unistd_h.m4 serial 4 +dnl Copyright (C) 2006-2007 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. @@ -8,11 +8,32 @@ dnl Written by Simon Josefsson AC_DEFUN([gl_HEADER_UNISTD], [ - dnl Prerequisites of lib/unistd.h. - AC_CHECK_HEADERS([unistd.h], [ - UNISTD_H='' - ], [ + dnl Use AC_REQUIRE here, so that the default behavior below is expanded + dnl once only, before all statements that occur in other macros. + AC_REQUIRE([gl_HEADER_UNISTD_DEFAULTS]) + + AC_CHECK_HEADERS([unistd.h], [], [ UNISTD_H='unistd.h' ]) + dnl This module decides to build unistd.h if it is missing. + dnl The fchdir module decides to build unistd.h if fchdir() is missing. + dnl Therefore check for the prerequisites of lib/unistd.h always. + gl_PREREQ_UNISTD +]) + +dnl Prerequisites of lib/unistd.h. +AC_DEFUN([gl_PREREQ_UNISTD], +[ + AC_CHECK_HEADERS_ONCE([unistd.h]) + if test $ac_cv_header_unistd_h = yes; then + gl_ABSOLUTE_HEADER([unistd.h]) + ABSOLUTE_UNISTD_H=\"$gl_cv_absolute_unistd_h\" + fi + AC_SUBST([ABSOLUTE_UNISTD_H]) +]) + +AC_DEFUN([gl_HEADER_UNISTD_DEFAULTS], +[ + UNISTD_H= AC_SUBST(UNISTD_H) ]) |