-AC_CHECK_FUNC(pthread_condattr_setclock,have_pthread_condattr_setclock=true,have_pthread_condattr_setclock=false)
-if test x$have_pthread_condattr_setclock = xtrue; then
- AC_SEARCH_LIBS([clock_getres],[rt],[THREAD_LIBS="$THREAD_LIBS -lrt"])
- AC_MSG_CHECKING([for CLOCK_MONOTONIC])
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <time.h>
+
+is_missing_pthread_function="is required when compiling D-Bus on Unix platforms, but is not in your libc or libpthread. Please open a bug on https://bugs.freedesktop.org/enter_bug.cgi?product=dbus with details of your platform."
+
+# Don't do these automatic checks if the user set THREAD_LIBS on the
+# configure command-line. If they did, we assume they're right.
+#
+# We also don't do these checks on Windows, because you don't need magical
+# linker flags to have threading support there.
+AS_IF([test "x$dbus_unix" = xyes && test "x$THREAD_LIBS" = x],
+ [
+ # Mandatory pthread functions. In principle, some of these could be made
+ # optional if there are platforms that don't have them.
+ #
+ # Currently, we only look in -lpthread.
+ # In principle we might need to look in -lpthreads, -lthreads, ...
+ # as well - please file a bug if your platform needs this.
+ AC_SEARCH_LIBS([pthread_cond_timedwait],
+ [pthread],
+ [THREAD_LIBS="$LIBS"],
+ [AC_MSG_ERROR([pthread_cond_timedwait $is_missing_pthread_function])],
+ [])
+ AC_SEARCH_LIBS([pthread_mutexattr_init],
+ [pthread],
+ [THREAD_LIBS="$LIBS"],
+ [AC_MSG_ERROR([pthread_mutexattr_init $is_missing_pthread_function])],
+ [])
+ AC_SEARCH_LIBS([pthread_mutexattr_settype],
+ [pthread],
+ [THREAD_LIBS="$LIBS"],
+ [AC_MSG_ERROR([pthread_mutexattr_settype $is_missing_pthread_function])],
+ [])
+
+ # Optional, for monotonic clocks. Because it's optional, this check
+ # is non-fatal if we don't find it.
+ AC_SEARCH_LIBS([pthread_condattr_setclock],
+ [pthread],
+ [THREAD_LIBS="$LIBS"])
+
+ AS_IF([test "x$ac_cv_search_pthread_condattr_setclock" != xno],
+ [
+ AC_SEARCH_LIBS([clock_getres], [rt], [THREAD_LIBS="$LIBS"])
+ AC_MSG_CHECKING([for CLOCK_MONOTONIC])
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[[#include <time.h>