glib-compat.h: add new thread API emulation on top of pre-2.31 API

Thread API changed in glib-2.31 significantly.  Before that version,
conditionals and mutexes were only allocated dynamically, using
_new()/_free() interface.  in 2.31 and up, they're allocated statically
as regular variables, and old interface is deprecated.

(Note: glib docs says the new interface is available since version
2.32, but it was actually introduced in version 2.31).

Create the new interface using old primitives, by providing non-opaque
definitions of the base types (GCond and GMutex) using GOnces.

Replace #ifdeffery around GCond and GMutex in trace/simple.c and
coroutine-gthread.c too because it does not work anymore with the new
glib-compat.h.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
[Use GOnce to support lazy initialization; introduce CompatGMutex
 and CompatGCond.  - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
vscclient: use glib thread primitives not qemu

Use glib-provided thread primitives in vscclient instead of
qemu ones, and do not use qemu sockets in there (open-code
call to WSAStartup() for windows to initialize things).

This way, vscclient becomes more stand-alone, independent on
qemu internals.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Alon Levy <alevy@redhat.com>
Tested-by: Alon Levy <alevy@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
libcacard: replace qemu thread primitives with glib ones

Replace QemuMutex with GMutex and QemuCond with GCond
(with corresponding function changes), to make libcacard
independent of qemu internal functions.

After this step, none of libcacard internals use any
qemu-provided symbols.  Maybe it's a good idea to
stop including qemu-common.h internally too.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Alon Levy <alevy@redhat.com>
Tested-by: Alon Levy <alevy@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
libcacard: actually use symbols file

libtool has an argument for .syms file, which is -export-symbols.
There's no argument `-export-syms', and it looks like at least on
linux, -export-syms is just ignored.  Use the correct argument,
-export-symbols, to actually get the right export list.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Alon Levy <alevy@redhat.com>
Tested-by: Alon Levy <alevy@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
libcacard: improve documentation

Using the file-backed smartcard backend is black magic, but it can
be useful if your only smartcard bricks itself if it is accessed
the wrong way too many times.

Complete the documentation to include the art of creating certificates
and using them with QEMU, based on Ray Strode's useful tutorial at
https://blogs.gnome.org/halfline/2013/09/08/another-smartcard-post/
but with ccid-card-emulated or vscclient instead of SPICE.

Cc: Ray Strode <rstrode@redhat.com>
Reviewed-by: Alon Levy <alevy@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
configure: duplicate/incorrect order of -lrt

'-lrt' flag duplication/incorrect order
would cause 'undefined reference to clock_gettime' error during compilation time.

Before fix:
... -o qemu-bridge-helper qemu-bridge-helper.o    -lrt -pthread -lgthread-2.0 -lrt -lglib-2.0
After fix:
... -o qemu-bridge-helper qemu-bridge-helper.o    -pthread -lgthread-2.0 -lrt -lglib-2.0

Reference:
http://hi.baidu.com/sanitywolf/item/7a8b69c1e76dd220a0b50ab1

Signed-off-by: Rick Liu <yrliu.ca@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
configure: unset interfering variables

The check for big or little endianness relies on grep reporting
match/non-match on the generated binary. If the user specified
--binary-files=without-match in their GREP_OPTIONS, this will fail.

Let's follow what autoconf does and unset GREP_OPTIONS and CLICOLOR_FORCE
at the beginning of the script.

Reported-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
rules.mak: Rewrite unnest-vars

The macro unnest-vars is the most important, complicated but hard to
track magic in QEMU's build system.

Rewrite it in a (hopefully) clearer way, with more comments, to make it
easier to understand and maintain.

Remove DSO_CFLAGS and module-objs-m that are not used.

A bonus fix of this version is, per object variables are properly
protected in save-objs and load-objs, before including sub-dir
Makefile.objs, just as nested variables are. So the occasional same
object name from different directory levels won't step on each other's
foot.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Merge remote-tracking branch 'remotes/bonzini/configure' into staging

* remotes/bonzini/configure:
  rules.mak: Rewrite unnest-vars
  configure: unset interfering variables
  configure: duplicate/incorrect order of -lrt
  libcacard: improve documentation
  libcacard: actually use symbols file
  libcacard: replace qemu thread primitives with glib ones
  vscclient: use glib thread primitives not qemu
  glib-compat.h: add new thread API emulation on top of pre-2.31 API

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>