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authorGravatar Nikias Bassen2021-09-13 18:38:56 +0200
committerGravatar Nikias Bassen2021-09-13 18:38:56 +0200
commit042c1a264a7e853fcdfc9c6a1b0090d56fc3ff81 (patch)
tree771993627b6b7ba8f1d94013341528b4e56cb09a
parent90355270862eb89269feb967da16e61828901284 (diff)
downloadlibimobiledevice-glue-042c1a264a7e853fcdfc9c6a1b0090d56fc3ff81.tar.gz
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Check availability of constructor attribute and use it on Windows in favor of DllMain
-rw-r--r--configure.ac18
-rw-r--r--src/glue.c28
2 files changed, 36 insertions, 10 deletions
diff --git a/configure.ac b/configure.ac
index 2b5c430..bfc443e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -72,6 +72,24 @@ 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_CHECK_MEMBER(struct dirent.d_type, AC_DEFINE(HAVE_DIRENT_D_TYPE, 1, [define if struct dirent has member d_type]),, [#include <dirent.h>])
AS_COMPILER_FLAGS(GLOBAL_CFLAGS, "-Wall -Wextra -Wmissing-declarations -Wredundant-decls -Wshadow -Wpointer-arith -Wwrite-strings -Wswitch-default -Wno-unused-parameter -fsigned-char -fvisibility=hidden")
diff --git a/src/glue.c b/src/glue.c
index e65ef56..7970679 100644
--- a/src/glue.c
+++ b/src/glue.c
@@ -44,7 +44,23 @@ static void internal_glue_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)) limd_glue_initialize(void)
+{
+ thread_once(&init_once, internal_glue_init);
+}
+
+static void __attribute__((destructor)) limd_glue_deinitialize(void)
+{
+ thread_once(&deinit_once, internal_glue_deinit);
+}
+#elif defined(WIN32)
BOOL WINAPI DllMain(HINSTANCE hModule, DWORD dwReason, LPVOID lpReserved)
{
switch (dwReason) {
@@ -60,13 +76,5 @@ BOOL WINAPI DllMain(HINSTANCE hModule, DWORD dwReason, LPVOID lpReserved)
return 1;
}
#else
-static void __attribute__((constructor)) limd_glue_initialize(void)
-{
- thread_once(&init_once, internal_glue_init);
-}
-
-static void __attribute__((destructor)) limd_glue_deinitialize(void)
-{
- thread_once(&deinit_once, internal_glue_deinit);
-}
+#warning No compiler support for constructor/destructor attributes, some features might not be available.
#endif