From 6cc8d697ad95ae3878051e9d81fe072ce047ddf5 Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Mon, 20 Sep 2021 01:06:27 +0200
Subject: Check availability of constructor attribute and use it on Windows in
 favor of DllMain

---
 src/activation.c | 40 +++++++++++++++++++++++-----------------
 1 file changed, 23 insertions(+), 17 deletions(-)

(limited to 'src')

diff --git a/src/activation.c b/src/activation.c
index ab1c204..ff71ef2 100644
--- a/src/activation.c
+++ b/src/activation.c
@@ -101,7 +101,6 @@ static void internal_libideviceactivation_deinit(void)
 }
 
 #ifdef WIN32
-
 typedef volatile struct {
     LONG lock;
     int state;
@@ -121,7 +120,29 @@ static void thread_once(thread_once_t *once_control, void (*init_routine)(void))
     }
     InterlockedExchange(&(once_control->lock), 0);
 }
+#else
+static pthread_once_t init_once = PTHREAD_ONCE_INIT;
+static pthread_once_t deinit_once = PTHREAD_ONCE_INIT;
+#define thread_once pthread_once
+#endif
+
+#ifndef HAVE_ATTRIBUTE_CONSTRUCTOR
+  #if defined(__llvm__) || defined(__GNUC__)
+    #define HAVE_ATTRIBUTE_CONSTRUCTOR
+  #endif
+#endif
+
+#ifdef HAVE_ATTRIBUTE_CONSTRUCTOR
+static void __attribute__((constructor)) libideviceactivation_initialize(void)
+{
+    thread_once(&init_once, internal_libideviceactivation_init);
+}
 
+static void __attribute__((destructor)) libideviceactivation_deinitialize(void)
+{
+    thread_once(&deinit_once, internal_libideviceactivation_deinit);
+}
+#elif defined(WIN32)
 BOOL WINAPI DllMain(HINSTANCE hModule, DWORD dwReason, LPVOID lpReserved)
 {
     switch (dwReason) {
@@ -136,25 +157,10 @@ BOOL WINAPI DllMain(HINSTANCE hModule, DWORD dwReason, LPVOID lpReserved)
     }
     return 1;
 }
-
 #else
-
-static pthread_once_t init_once = PTHREAD_ONCE_INIT;
-static pthread_once_t deinit_once = PTHREAD_ONCE_INIT;
-
-static void __attribute__((constructor)) libideviceactivation_initialize(void)
-{
-    pthread_once(&init_once, internal_libideviceactivation_init);
-}
-
-static void __attribute__((destructor)) libideviceactivation_deinitialize(void)
-{
-    pthread_once(&deinit_once, internal_libideviceactivation_deinit);
-}
-
+#warning No compiler support for constructor/destructor attributes, some features might not be available.
 #endif
 
-
 static int debug_level = 0;
 
 IDEVICE_ACTIVATION_API void idevice_activation_set_debug_level(int level) {
-- 
cgit v1.1-32-gdbae