From 8f66cfa156f04cc6f1f6a78bff261122de6801ca Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Thu, 6 Jan 2022 09:22:30 +0100
Subject: Check availability of constructor attribute and use it on Windows in
 favor of DllMain

---
 configure.ac | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 518366c..e844956 100644
--- a/configure.ac
+++ b/configure.ac
@@ -82,6 +82,24 @@ case ${host_os} in
 esac
 AM_CONDITIONAL(WIN32, test x$win32 = xtrue)
 
+# Check if the C compiler supports __attribute__((constructor))
+AC_CACHE_CHECK([wether the C compiler supports constructor/destructor attributes],
+  ac_cv_attribute_constructor, [
+  ac_cv_attribute_constructor=no
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+    [[
+      static void __attribute__((constructor)) test_constructor(void) {
+      }
+      static void __attribute__((destructor)) test_destructor(void) {
+      }
+    ]], [])],
+    [ac_cv_attribute_constructor=yes]
+  )]
+)
+if test "$ac_cv_attribute_constructor" = "yes"; then
+  AC_DEFINE(HAVE_ATTRIBUTE_CONSTRUCTOR, 1, [Define if the C compiler supports constructor/destructor attributes])
+fi
+
 AC_ARG_WITH([dummy],
 	[AS_HELP_STRING([--with-dummy], [Use no USB driver at all [default=no]. This is only useful if you just want to query the device list by product type or hardware model. All other operations are no-ops or will return IRECV_E_UNSUPPORTED.])],
 	[],
-- 
cgit v1.1-32-gdbae