Bug 1880424 - Move clock_monotonic check to moz.configure r=glandium

Differential Revision: https://phabricator.services.mozilla.com/D201942

build/moz.configure/libraries.configure

@@ -0,0 +1,44 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+@template
+def check_clock_monotonic_support(lib=None, when=None):
+    check_msg = "for clock_gettime(CLOCK_MONOTONIC)"
+    flags = []
+
+    if lib is not None:
+        check_msg += f" in {lib}"
+        flags.append(f"-l{lib}")
+
+    check_when = building_with_gnu_cc
+    if when is not None:
+        check_when &= when
+
+    return try_link(
+        includes=["time.h"],
+        body="struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts);",
+        check_msg=check_msg,
+        flags=flags,
+        when=check_when,
+    )
+
+
+have_raw_clock_monotonic_support = check_clock_monotonic_support()
+have_rt_clock_monotonic_support = check_clock_monotonic_support(
+    lib="rt", when=~have_raw_clock_monotonic_support
+)
+
+set_define(
+    "HAVE_CLOCK_MONOTONIC",
+    have_raw_clock_monotonic_support | have_rt_clock_monotonic_support,
+)
+set_config(
+    "HAVE_CLOCK_MONOTONIC",
+    have_raw_clock_monotonic_support | have_rt_clock_monotonic_support,
+)
+
+set_config("REALTIME_LIBS", ["-lrt"], when=have_rt_clock_monotonic_support)

js/src/old-configure.in

@@ -601,32 +601,6 @@ then
 fi
 
 
-dnl Checks for library functions.
-dnl ========================================================
-
-dnl check for clock_gettime(), the CLOCK_MONOTONIC clock
-AC_CACHE_CHECK(for clock_gettime(CLOCK_MONOTONIC),
-               ac_cv_clock_monotonic,
-               [for libs in "" -lrt; do
-                    _SAVE_LIBS="$LIBS"
-                    LIBS="$LIBS $libs"
-                    AC_TRY_LINK([#include <time.h>],
-                                 [ struct timespec ts;
-                                   clock_gettime(CLOCK_MONOTONIC, &ts); ],
-                                 ac_cv_clock_monotonic=$libs
-                                 LIBS="$_SAVE_LIBS"
-                                 break,
-                                 ac_cv_clock_monotonic=no)
-                    LIBS="$_SAVE_LIBS"
-                done])
-if test "$ac_cv_clock_monotonic" != "no"; then
-    HAVE_CLOCK_MONOTONIC=1
-    REALTIME_LIBS=$ac_cv_clock_monotonic
-    AC_DEFINE(HAVE_CLOCK_MONOTONIC)
-    AC_SUBST(HAVE_CLOCK_MONOTONIC)
-    AC_SUBST_LIST(REALTIME_LIBS)
-fi
-
 dnl Checks for math functions.
 dnl ========================================================
 AC_CHECK_LIB(m, sin)

moz.configure

@@ -208,6 +208,7 @@ include("build/moz.configure/toolchain.configure", when="--enable-compile-enviro
 include("build/moz.configure/pkg.configure")
 include("build/moz.configure/memory.configure", when="--enable-compile-environment")
 include("build/moz.configure/headers.configure", when="--enable-compile-environment")
+include("build/moz.configure/libraries.configure", when="--enable-compile-environment")
 include("build/moz.configure/warnings.configure", when="--enable-compile-environment")
 include("build/moz.configure/flags.configure", when="--enable-compile-environment")
 include("build/moz.configure/lto-pgo.configure", when="--enable-compile-environment")

old-configure.in

@@ -637,29 +637,6 @@ fi
 dnl Checks for library functions.
 dnl ========================================================
 
-dnl check for clock_gettime(), the CLOCK_MONOTONIC clock
-AC_CACHE_CHECK(for clock_gettime(CLOCK_MONOTONIC),
-               ac_cv_clock_monotonic,
-               [for libs in "" -lrt; do
-                    _SAVE_LIBS="$LIBS"
-                    LIBS="$LIBS $libs"
-                    AC_TRY_LINK([#include <time.h>],
-                                 [ struct timespec ts;
-                                   clock_gettime(CLOCK_MONOTONIC, &ts); ],
-                                 ac_cv_clock_monotonic=$libs
-                                 LIBS="$_SAVE_LIBS"
-                                 break,
-                                 ac_cv_clock_monotonic=no)
-                    LIBS="$_SAVE_LIBS"
-                done])
-if test "$ac_cv_clock_monotonic" != "no"; then
-    HAVE_CLOCK_MONOTONIC=1
-    REALTIME_LIBS=$ac_cv_clock_monotonic
-    AC_DEFINE(HAVE_CLOCK_MONOTONIC)
-    AC_SUBST(HAVE_CLOCK_MONOTONIC)
-    AC_SUBST_LIST(REALTIME_LIBS)
-fi
-
 AC_CACHE_CHECK(
     [for res_ninit()],
     ac_cv_func_res_ninit,