1 files changed, 61 insertions, 0 deletions
diff --git a/m4/sys_time_h.m4 b/m4/sys_time_h.m4
new file mode 100644
index 0000000..b38e1bc
--- /dev/null
+++ b/m4/sys_time_h.m4
@@ -0,0 +1,61 @@
+# Configure a replacement for <sys/time.h>.
+
+# Copyright (C) 2007 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# Written by Paul Eggert and Martin Lambers.
+
+AC_DEFUN([gl_HEADER_SYS_TIME_H],
+[
+  dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement
+  dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1
+  dnl statements that occur in other macros.
+  AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY])
+])
+
+AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
+[
+  AC_REQUIRE([AC_C_RESTRICT])
+  AC_CHECK_HEADERS_ONCE([sys/time.h])
+
+  if test $ac_cv_header_sys_time_h = yes; then
+    gl_ABSOLUTE_HEADER([sys/time.h])
+    ABSOLUTE_SYS_TIME_H=\"$gl_cv_absolute_sys_time_h\"
+    HAVE_SYS_TIME_H=1
+  else
+    ABSOLUTE_SYS_TIME_H=\"no/such/file/sys/time.h\"
+    HAVE_SYS_TIME_H=0
+  fi
+  AC_SUBST([ABSOLUTE_SYS_TIME_H])
+  AC_SUBST([HAVE_SYS_TIME_H])
+
+  AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+	  [[#if HAVE_SYS_TIME_H
+	     #include <sys/time.h>
+	    #endif
+	    #include <time.h>
+	  ]],
+	  [[static struct timeval x; x.tv_sec = x.tv_usec;]])],
+       [gl_cv_sys_struct_timeval=yes],
+       [gl_cv_sys_struct_timeval=no])])
+  if test $gl_cv_sys_struct_timeval = yes; then
+    HAVE_STRUCT_TIMEVAL=1
+  else
+    HAVE_STRUCT_TIMEVAL=0
+  fi
+  AC_SUBST([HAVE_STRUCT_TIMEVAL])
+
+  dnl Assume POSIX behavior unless another module says otherwise.
+  REPLACE_GETTIMEOFDAY=0
+  AC_SUBST([REPLACE_GETTIMEOFDAY])
+  if test $HAVE_SYS_TIME_H = 0 || test $HAVE_STRUCT_TIMEVAL = 0; then
+    SYS_TIME_H=sys/time.h
+  else
+    SYS_TIME_H=
+  fi
+  AC_SUBST([SYS_TIME_H])
+])