m4/full-header-path.m4

   1 # full-header-path.m4 serial 2
   2 dnl Copyright (C) 2006 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 dnl From Derek Price.
   8
   9 # gl_FULL_HEADER_PATH(HEADER1 HEADER2 ...)
  10 # ----------------------------------------
  11 # Find the full path to a header file, assuming the header exists.
  12 # If the header were sys/inttypes.h, this macro would define
  13 # FULL_PATH_SYS_INTTYPES_H to the `<>' quoted full path to sys/inttypes.h
  14 # in config.h
  15 # (e.g. `#define FULL_PATH_SYS_INTTYPES_H </usr/include/sys/inttypes.h>').
  16 AC_DEFUN([gl_FULL_HEADER_PATH],
  17 [AC_LANG_PREPROC_REQUIRE()dnl
  18 AC_FOREACH([gl_HEADER_NAME], [$1],
  19   [AS_VAR_PUSHDEF([gl_full_header_path],
  20                   [gl_cv_full_path_]m4_quote(m4_defn([gl_HEADER_NAME])))dnl
  21   AC_CACHE_CHECK([full path to <]m4_quote(m4_defn([gl_HEADER_NAME]))[>],
  22     m4_quote(m4_defn([gl_full_header_path])),
  23     [AS_VAR_PUSHDEF([ac_header_exists],
  24                     [ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME])))dnl
  25     AC_CHECK_HEADERS_ONCE(m4_quote(m4_defn([gl_HEADER_NAME])))dnl
  26     if test AS_VAR_GET(ac_header_exists) = yes; then
  27       AC_LANG_CONFTEST([AC_LANG_SOURCE([[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]])])
  28 dnl eval is necessary to expand ac_cpp.
  29 dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell.
  30       AS_VAR_SET(gl_full_header_path,
  31 [`(eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
  32 sed -n '\#/]m4_quote(m4_defn([gl_HEADER_NAME]))[#{s#.*"\(.*/]m4_quote(m4_defn([gl_HEADER_NAME]))[\)".*#\1#;p;q;}'`])
  33     fi
  34     AS_VAR_POPDEF([ac_header_exists])dnl
  35     ])dnl
  36   AC_DEFINE_UNQUOTED(AS_TR_CPP([FULL_PATH_]m4_quote(m4_defn([gl_HEADER_NAME]))),
  37                      [<AS_VAR_GET(gl_full_header_path)>],
  38                      [Define this to the full path to <]m4_quote(m4_defn([gl_HEADER_NAME]))[>.])
  39   AS_VAR_POPDEF([gl_full_header_path])dnl
  40 ])dnl
  41 ])# gl_FULL_HEADER_PATH