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(UTILS_FUNC_DIRFD): Also detect when dirfd is a macro.

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This is necessary at least on Darwin 5.3.
This commit is contained in:
Jim Meyering
2002-04-12 20:48:29 +00:00
parent 7f01432879
commit 50bc2a4286
1 changed files with 14 additions and 4 deletions
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18
m4/dirfd.m4
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@@ -1,4 +1,4 @@
#serial 1
#serial 2
dnl Find out how to get the file descriptor associated with an open DIR*.
dnl From Jim Meyering
@@ -25,9 +25,19 @@ AC_DEFUN([UTILS_FUNC_DIRFD],
AC_CHECK_FUNCS(dirfd)
AC_CHECK_DECLS([dirfd], , , $dirfd_headers)
# Use the replacement only if we have neither the function
# nor a declaration.
if test $ac_cv_func_dirfd,$ac_cv_have_decl_dirfd = no,no; then
AC_CACHE_CHECK([whether dirfd is a macro],
jm_cv_func_dirfd_macro,
AC_EGREP_CPP([dirent_header_defines_dirfd], [$dirfd_headers
#ifdef dirfd
dirent_header_defines_dirfd
#endif],
jm_cv_func_dirfd_macro=yes,
jm_cv_func_dirfd_macro=no))
# Use the replacement only if we have no function, macro,
# or declaration with that name.
if test $ac_cv_func_dirfd,$ac_cv_have_decl_dirfd,$jm_cv_func_dirfd_macro \
= no,no,no; then
AC_REPLACE_FUNCS([dirfd])
AC_CACHE_CHECK(
[how to get the file descriptor associated with an open DIR*],