From 984faac66812652082fc9aa46eceb21669c1131b Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Tue, 10 Feb 2015 19:41:34 +0100
Subject: [PATCH 11/16] build: reenable local builds to pass --enable-debug
 (RHEL only)

Message-id: <1423597294-16022-2-git-send-email-lersek@redhat.com>
Patchwork-id: 63788
O-Subject: [RHEL-7.2 qemu-kvm PATCH 1/1] build: reenable local builds to pass --enable-debug (RHEL only)
Bugzilla:
RH-Acked-by: Markus Armbruster <armbru@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>

RHEL-7 commit f6852e27 dropped the "isa-ide" device, and observed:

  Unresolved extern symbols pose no real danger, because they fail safely
  at link time.  Note for the curious: the optimizer gets rid of the
  reference to isa_ide_init() in hw/i386/pc_piix.c.

For local builds it is sometimes useful to pass --enable-debug to the
configure script. However that flag disables the optimizer, and the
isa_ide_init() call is not eliminated during compilation; it reaches the
linker. The linker then barfs

    LINK  x86_64-softmmu/qemu-system-x86_64
  hw/i386/pc_piix.o: In function `pc_init1':
  .../hw/i386/pc_piix.c:221: undefined reference to `isa_ide_init'
  collect2: error: ld returned 1 exit status

Provide a stub implementation for isa_ide_init(), reenabling local debug
builds.

No copyright notice is added to the top of the new file, following the
pattern set by other stub files.

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
 stubs/Makefile.objs |  1 +
 stubs/ide-isa.c     | 12 ++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 stubs/ide-isa.c

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 stubs/Makefile.objs |  1 +
 stubs/ide-isa.c     | 12 ++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 stubs/ide-isa.c

diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index 4b2cb7d..590008e 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -26,3 +26,4 @@ stub-obj-y += vm-stop.o
 stub-obj-y += vmstate.o
 stub-obj-$(CONFIG_WIN32) += fd-register.o
 stub-obj-y += cpus.o
+stub-obj-y += ide-isa.o
diff --git a/stubs/ide-isa.c b/stubs/ide-isa.c
new file mode 100644
index 0000000..4074aff
--- /dev/null
+++ b/stubs/ide-isa.c
@@ -0,0 +1,12 @@
+#include <hw/ide.h>
+#include <stdlib.h>
+
+ISADevice *isa_ide_init(ISABus *bus, int iobase, int iobase2, int isairq,
+                        DriveInfo *hd0, DriveInfo *hd1)
+{
+    /*
+     * In theory the real isa_ide_init() function can return NULL, but no
+     * caller actually checks for that. Make sure we go out with a clear bang.
+     */
+    abort();
+}
-- 
1.8.3.1