From 7bf0afa621ccbce8f3a078f7e921e5f5a456257b Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 8 Dec 2019 22:37:47 +0530
Subject: [PATCH] Fix #2187

---
 glfw/init.c           |  1 -
 glfw/monotonic.c      | 10 ++++++++++
 glfw/source-info.json |  1 +
 kitty/data-types.c    |  1 -
 kitty/monotonic.c     | 10 ++++++++++
 kitty/monotonic.h     | 26 +++++++++++++-------------
 setup.py              |  3 +--
 7 files changed, 35 insertions(+), 17 deletions(-)
 create mode 100644 glfw/monotonic.c
 create mode 100644 kitty/monotonic.c

diff --git a/glfw/init.c b/glfw/init.c
index 332102f5d..6318427c2 100644
--- a/glfw/init.c
+++ b/glfw/init.c
@@ -27,7 +27,6 @@
 // Please use C89 style variable declarations in this file because VS 2010
 //========================================================================
 
-#define MONOTONIC_START_MODULE
 #include "internal.h"
 #include "mappings.h"
 
diff --git a/glfw/monotonic.c b/glfw/monotonic.c
new file mode 100644
index 000000000..5d071d843
--- /dev/null
+++ b/glfw/monotonic.c
@@ -0,0 +1,10 @@
+/*
+ * monotonic.c
+ * Copyright (C) 2019 Kovid Goyal <kovid at kovidgoyal.net>
+ *
+ * Distributed under terms of the GPL3 license.
+ */
+
+#define _POSIX_C_SOURCE 200809L
+#define MONOTONIC_IMPLEMENTATION
+#include "../kitty/monotonic.h"
diff --git a/glfw/source-info.json b/glfw/source-info.json
index 497bb2229..20018ff72 100644
--- a/glfw/source-info.json
+++ b/glfw/source-info.json
@@ -31,6 +31,7 @@
       "input.c",
       "monitor.c",
       "vulkan.c",
+      "monotonic.c",
       "window.c"
     ]
   },
diff --git a/kitty/data-types.c b/kitty/data-types.c
index a5f4731b5..98b47b03f 100644
--- a/kitty/data-types.c
+++ b/kitty/data-types.c
@@ -5,7 +5,6 @@
  * Distributed under terms of the GPL3 license.
  */
 
-#define MONOTONIC_START_MODULE
 #ifdef __APPLE__
 // Needed for _CS_DARWIN_USER_CACHE_DIR
 #define _DARWIN_C_SOURCE
diff --git a/kitty/monotonic.c b/kitty/monotonic.c
new file mode 100644
index 000000000..fd6d43982
--- /dev/null
+++ b/kitty/monotonic.c
@@ -0,0 +1,10 @@
+/*
+ * monotonic.c
+ * Copyright (C) 2019 Kovid Goyal <kovid at kovidgoyal.net>
+ *
+ * Distributed under terms of the GPL3 license.
+ */
+
+#define _POSIX_C_SOURCE 200809L
+#define MONOTONIC_IMPLEMENTATION
+#include "monotonic.h"
diff --git a/kitty/monotonic.h b/kitty/monotonic.h
index 7be3c11aa..0d2d94ce1 100644
--- a/kitty/monotonic.h
+++ b/kitty/monotonic.h
@@ -61,14 +61,21 @@ static inline double monotonic_t_to_s_double(monotonic_t time) {
     return (double)time / 1000.0 / 1000.0 / 1000.0;
 }
 
-#ifdef MONOTONIC_START_MODULE
-monotonic_t monotonic_start_time = 0;
-#else
 extern monotonic_t monotonic_start_time;
-#endif
+extern monotonic_t monotonic_(void);
 
+static inline monotonic_t monotonic(void) {
+	return monotonic_() - monotonic_start_time;
+}
 
-static inline monotonic_t monotonic_(void) {
+static inline void init_monotonic(void) {
+	monotonic_start_time = monotonic_();
+}
+
+#ifdef MONOTONIC_IMPLEMENTATION
+monotonic_t monotonic_start_time = 0;
+
+monotonic_t monotonic_(void) {
     struct timespec ts = {0};
 #ifdef CLOCK_HIGHRES
     clock_gettime(CLOCK_HIGHRES, &ts);
@@ -79,11 +86,4 @@ static inline monotonic_t monotonic_(void) {
 #endif
     return calc_nano_time(ts);
 }
-
-static inline monotonic_t monotonic(void) {
-	return monotonic_() - monotonic_start_time;
-}
-
-static inline void init_monotonic(void) {
-	monotonic_start_time = monotonic_();
-}
+#endif
diff --git a/setup.py b/setup.py
index c60535c0e..938fed538 100755
--- a/setup.py
+++ b/setup.py
@@ -212,10 +212,9 @@ def init_env(
     cppflags = shlex.split(cppflags)
     for el in extra_logging:
         cppflags.append('-DDEBUG_{}'.format(el.upper().replace('-', '_')))
-    # _POSIX_C_SOURCE is needed for clock_gettime() in monotonic.h
     cflags = os.environ.get(
         'OVERRIDE_CFLAGS', (
-            '-Wextra {} -Wno-missing-field-initializers -Wall -Wstrict-prototypes -D_POSIX_C_SOURCE=200809L -std=c11'
+            '-Wextra {} -Wno-missing-field-initializers -Wall -Wstrict-prototypes -std=c11'
             ' -pedantic-errors -Werror {} {} -fwrapv {} {} -pipe {} -fvisibility=hidden'
         ).format(
             float_conversion,