windows: Silence zero-sized array warning in libusb.h for msvc
Silence "nonstandard extension used : zero-sized array in struct/union"
(C4200) warning caused by use of ZERO_SIZED_ARRAY in structures defined
in libusb.h when compiling with msvc.
A libusb user including the header from a c++ file is more likely to be
annoyed by the warning because it is activated at level 2 as opposed to
being included from a C file, where it's not activated until level 4.
(on msvc, level 4 is the last step before -Wall).
This causes problems when you also enable -Werror for your own source,
since the libusb header just gets merged into the compilation unit.
9>hotplugtest.c
9>C:\src\libusb\libusb\libusb.h(786,11): error C2220: the following warning is treated as an error
9>C:\src\libusb\libusb\libusb.h(786,11): error C2220: uint8_t dev_capability_data[ZERO_SIZED_ARRAY];
9>C:\src\libusb\libusb\libusb.h(786,11): error C2220: ^
9>C:\src\libusb\libusb\libusb.h(786,11): warning C4200: nonstandard extension used: zero-sized array in struct/union
9>C:\src\libusb\libusb\libusb.h(786,11): warning C4200: uint8_t dev_capability_data[ZERO_SIZED_ARRAY];
9>C:\src\libusb\libusb\libusb.h(786,11): warning C4200: ^
9>C:\src\libusb\libusb\libusb.h(811,47): warning C4200: nonstandard extension used: zero-sized array in struct/union
5>C:\src\libusb\libusb\libusb.h(811,47): warning C4200: struct libusb_bos_dev_capability_descriptor *dev_capability[ZERO_SIZED_ARRAY];
5>C:\src\libusb\libusb\libusb.h(811,47): warning C4200: ^
9>C:\src\libusb\libusb\libusb.h(1284,38): warning C4200: nonstandard extension used: zero-sized array in struct/union
9>C:\src\libusb\libusb\libusb.h(1284,38): warning C4200: struct libusb_iso_packet_descriptor iso_packet_desc[ZERO_SIZED_ARRAY];
9>C:\src\libusb\libusb\libusb.h(1284,38): warning C4200: ^
9>Done building project "hotplugtest.vcxproj" -- FAILED.
Closes #1112
diff --git a/libusb/libusb.h b/libusb/libusb.h
index 61cacc9..2592ea7 100644
--- a/libusb/libusb.h
+++ b/libusb/libusb.h
@@ -26,6 +26,9 @@
#define LIBUSB_H
#if defined(_MSC_VER)
+#pragma warning(push)
+/* Disable: warning C4200: nonstandard extension used : zero-sized array in struct/union */
+#pragma warning(disable:4200)
/* on MS environments, the inline keyword is available in C++ only */
#if !defined(__cplusplus)
#define inline __inline
@@ -2128,6 +2131,10 @@
int LIBUSB_CALL libusb_set_option(libusb_context *ctx, enum libusb_option option, ...);
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
#if defined(__cplusplus)
}
#endif
