dirfd can be implemented as macro, so use a better test case.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 49537ce..4c818b0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1203,7 +1203,6 @@
CHECK_FUNCTION_EXISTS_GLIBC(chown HAVE_CHOWN)
CHECK_FUNCTION_EXISTS_GLIBC(chroot HAVE_CHROOT)
CHECK_FUNCTION_EXISTS_GLIBC(ctime_r HAVE_CTIME_R)
-CHECK_FUNCTION_EXISTS_GLIBC(dirfd HAVE_DIRFD)
CHECK_FUNCTION_EXISTS_GLIBC(fchdir HAVE_FCHDIR)
CHECK_FUNCTION_EXISTS_GLIBC(fchflags HAVE_FCHFLAGS)
CHECK_FUNCTION_EXISTS_GLIBC(fchmod HAVE_FCHMOD)
@@ -1303,6 +1302,10 @@
"#include <dirent.h>\nint main() {DIR *d = opendir(\".\"); struct dirent e,*r; return readdir_r(d,&e,&r);}"
HAVE_READDIR_R)
+# dirfd can be either a function or a macro.
+CHECK_C_SOURCE_COMPILES(
+ "#include <dirent.h>\nint main() {DIR *d = opendir(\".\"); return dirfd(d);}"
+ HAVE_DIRFD)
# Only detect readlinkat() if we also have AT_FDCWD in unistd.h.
# NOTE: linux requires fcntl.h for AT_FDCWD.
diff --git a/configure.ac b/configure.ac
index 2545299..1730f45 100644
--- a/configure.ac
+++ b/configure.ac
@@ -605,7 +605,7 @@
# To avoid necessity for including windows.h or special forward declaration
# workarounds, we use 'void *' for 'struct SECURITY_ATTRIBUTES *'
AC_CHECK_STDCALL_FUNC([CreateHardLinkA],[const char *, const char *, void *])
-AC_CHECK_FUNCS([arc4random_buf chflags chown chroot ctime_r dirfd])
+AC_CHECK_FUNCS([arc4random_buf chflags chown chroot ctime_r])
AC_CHECK_FUNCS([fchdir fchflags fchmod fchown fcntl fdopendir fork])
AC_CHECK_FUNCS([fstat fstatat fstatfs fstatvfs ftruncate])
AC_CHECK_FUNCS([futimens futimes futimesat])
@@ -648,6 +648,13 @@
return(readdir_r(dir, &e, &r));]])],
[AC_DEFINE(HAVE_READDIR_R,1,[Define to 1 if you have a POSIX compatible readdir_r])]
)
+# dirfd can be either a function or a macro.
+AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[#include <dirent.h>
+ DIR *dir;]],
+ [[return(dirfd(dir));]])],
+ [AC_DEFINE(HAVE_DIRFD,1,[Define to 1 if you have a dirfd function or macro])]
+)
# FreeBSD's nl_langinfo supports an option to specify whether the
# current locale uses month/day or day/month ordering. It makes the
