build: replace weak symbols with a static library

Weak symbols were a nice idea, but they turned out not to be a good one.
Toolchain support is just too sparse, in particular llvm-gcc is totally
broken.

This patch uses a surprisingly low-tech approach: a static library.
Symbols in a static library are always overridden by symbols in an
object file.  Furthermore, if you place each function in a separate
source file, object files for unused functions will not be taken in.
This means that each function can use all the dependencies that it needs
(especially QAPI stuff such as error_setg).

Thus, all stubs are placed in separate object files and put together in
a static library.  The library then is linked to all programs.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

1 files changed, 0 insertions, 22 deletions

diff --git a/qemu-sockets.c b/qemu-sockets.c
index abcd791cb6..cfed9c5a5b 100644
--- a/qemu-sockets.c
+++ b/qemu-sockets.c
@@ -61,28 +61,6 @@ static QemuOptsList dummy_opts = {
     },
 };
 
-static int default_monitor_get_fd(Monitor *mon, const char *name, Error **errp)
-{
-    error_setg(errp, "only QEMU supports file descriptor passing");
-    return -1;
-}
-QEMU_WEAK_ALIAS(monitor_get_fd, default_monitor_get_fd);
-#define monitor_get_fd \
-    QEMU_WEAK_REF(monitor_get_fd, default_monitor_get_fd)
-
-static int default_qemu_set_fd_handler2(int fd,
-                                        IOCanReadHandler *fd_read_poll,
-                                        IOHandler *fd_read,
-                                        IOHandler *fd_write,
-                                        void *opaque)
-
-{
-    abort();
-}
-QEMU_WEAK_ALIAS(qemu_set_fd_handler2, default_qemu_set_fd_handler2);
-#define qemu_set_fd_handler2 \
-    QEMU_WEAK_REF(qemu_set_fd_handler2, default_qemu_set_fd_handler2)
-
 static int inet_getport(struct addrinfo *e)
 {
     struct sockaddr_in *i4;