libsdl: add fix for new _XGetRequest symbol backported to libx11

(From OE-Core rev: d2c96e22de19a649ff7121e5ea0f95797abba93a)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/libsdl/libsdl-1.2.14/add.XGetRequest.symbol.patch

@@ -0,0 +1,70 @@
+_XGetRequest API was backported to libx11-1.4.4 in:
+http://git.openembedded.org/openembedded-core/commit/?id=e08604800fe1cb8f240f53c147ceb4ee08a29b91
+
+This breaks e.g. libsdl-image build with:
+| /OE/shr-core/tmp-eglibc/sysroots/qemux86-64/usr/lib/libSDL.so: undefined reference to `_XGetRequest'
+
+For details see: https://bugzilla.redhat.com/show_bug.cgi?id=782251
+
+Upstream-Status: Accepted
+
+@@ -, +, @@ 
+ added.
+ src/video/x11/SDL_x11dyn.c |   24 ++++++++++++++++++++++++
+ src/video/x11/SDL_x11sym.h |    6 ++++++
+ 2 files changed, 30 insertions(+), 0 deletions(-)
+--- a/src/video/x11/SDL_x11dyn.c	
++++ a/src/video/x11/SDL_x11dyn.c	
+@@ -109,6 +109,21 @@ char *(*pXGetICValues)(XIC, ...) = NULL;
+ #undef SDL_X11_SYM
+ 
+ 
++static void *SDL_XGetRequest_workaround(Display* dpy, CARD8 type, size_t len)
++{
++	xReq *req;
++	WORD64ALIGN
++	if (dpy->bufptr + len > dpy->bufmax)
++		_XFlush(dpy);
++	dpy->last_req = dpy->bufptr;
++	req = (xReq*)dpy->bufptr;
++	req->reqType = type;
++	req->length = len / 4;
++	dpy->bufptr += len;
++	dpy->request++;
++	return req;
++}
++
+ static int x11_load_refcount = 0;
+ 
+ void SDL_X11_UnloadSymbols(void)
+@@ -168,6 +183,15 @@ int SDL_X11_LoadSymbols(void)
+ 		X11_GetSym("XGetICValues",&SDL_X11_HAVE_UTF8,(void **)&pXGetICValues);
+ 		#endif
+ 
++		/*
++		 * In case we're built with newer Xlib headers, we need to make sure
++		 *  that _XGetRequest() is available, even on older systems.
++		 *  Otherwise, various Xlib macros we use will call a NULL pointer.
++		 */
++		if (!SDL_X11_HAVE_XGETREQUEST) {
++			p_XGetRequest = SDL_XGetRequest_workaround;
++		}
++
+ 		if (SDL_X11_HAVE_BASEXLIB) {  /* all required symbols loaded. */
+ 			SDL_ClearError();
+ 		} else {
+--- a/src/video/x11/SDL_x11sym.h	
++++ a/src/video/x11/SDL_x11sym.h	
+@@ -170,6 +170,12 @@ SDL_X11_SYM(void,_XRead32,(Display *dpy,register long *data,long len),(dpy,data,
+ #endif
+ 
+ /*
++ * libX11 1.4.99.1 added _XGetRequest, and macros use it behind the scenes.
++ */
++SDL_X11_MODULE(XGETREQUEST)
++SDL_X11_SYM(void *,_XGetRequest,(Display* a,CARD8 b,size_t c),(a,b,c),return)
++
++/*
+  * These only show up on some variants of Unix.
+  */
+ #if defined(__osf__)

meta/recipes-graphics/libsdl/libsdl_1.2.14.bb

@@ -15,10 +15,11 @@ PROVIDES = "virtual/libsdl"
 DEPENDS = "${@base_contains('DISTRO_FEATURES', 'opengl', 'virtual/libgl', '', d)} virtual/libx11 libxext libxrandr libxrender tslib"
 DEPENDS_virtclass-nativesdk = "libx11-nativesdk libxrandr-nativesdk libxrender-nativesdk libxext-nativesdk"
 
-PR = "r4"
+PR = "r5"
 
 SRC_URI = "http://www.libsdl.org/release/SDL-${PV}.tar.gz \
            file://configure_tweak.patch \
+           file://add.XGetRequest.symbol.patch \
        "
 
 S = "${WORKDIR}/SDL-${PV}"