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authorGravatar Nikias Bassen2022-01-06 09:22:30 +0100
committerGravatar Nikias Bassen2022-01-06 09:22:30 +0100
commit8f66cfa156f04cc6f1f6a78bff261122de6801ca (patch)
treec5c50a4515dca0b6003975d7683e5beaac21c731
parent8bc9ccc2bff2e3f92a952bf9ae9fa218f448c774 (diff)
downloadlibirecovery-8f66cfa156f04cc6f1f6a78bff261122de6801ca.tar.gz
libirecovery-8f66cfa156f04cc6f1f6a78bff261122de6801ca.tar.bz2
Check availability of constructor attribute and use it on Windows in favor of DllMain
-rw-r--r--configure.ac18
-rw-r--r--src/libirecovery.c28
2 files changed, 36 insertions, 10 deletions
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.])],
[],
diff --git a/src/libirecovery.c b/src/libirecovery.c
index 0e971a0..b0f6409 100644
--- a/src/libirecovery.c
+++ b/src/libirecovery.c
@@ -442,7 +442,23 @@ static void _irecv_deinit(void)
static thread_once_t init_once = THREAD_ONCE_INIT;
static thread_once_t deinit_once = THREAD_ONCE_INIT;
-#ifdef WIN32
+#ifndef HAVE_ATTRIBUTE_CONSTRUCTOR
+ #if defined(__llvm__) || defined(__GNUC__)
+ #define HAVE_ATTRIBUTE_CONSTRUCTOR
+ #endif
+#endif
+
+#ifdef HAVE_ATTRIBUTE_CONSTRUCTOR
+static void __attribute__((constructor)) libirecovery_initialize(void)
+{
+ thread_once(&init_once, _irecv_init);
+}
+
+static void __attribute__((destructor)) libirecovery_deinitialize(void)
+{
+ thread_once(&deinit_once, _irecv_deinit);
+}
+#elif defined(WIN32)
BOOL WINAPI DllMain(HINSTANCE hModule, DWORD dwReason, LPVOID lpReserved)
{
switch (dwReason) {
@@ -458,15 +474,7 @@ BOOL WINAPI DllMain(HINSTANCE hModule, DWORD dwReason, LPVOID lpReserved)
return 1;
}
#else
-static void __attribute__((constructor)) libirecovery_initialize(void)
-{
- thread_once(&init_once, _irecv_init);
-}
-
-static void __attribute__((destructor)) libirecovery_deinitialize(void)
-{
- thread_once(&deinit_once, _irecv_deinit);
-}
+#warning No compiler support for constructor/destructor attributes, some features might not be available.
#endif
#ifdef HAVE_IOKIT