[xen stable-4.16] tools: Fix build with recent QEMU, use "--enable-trace-backends"

[patchbot@xxxxxxx]

commit 998c03b2abfbf17ff96bccad1512de1ea18d0d75
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Tue Feb 7 17:03:51 2023 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Feb 7 17:03:51 2023 +0100

    tools: Fix build with recent QEMU, use "--enable-trace-backends"
    
    The configure option "--enable-trace-backend" isn't accepted anymore
    and we should use "--enable-trace-backends" instead which was
    introduce in 2014 and allow multiple backends.
    
    "--enable-trace-backends" was introduced by:
        5b808275f3bb ("trace: Multi-backend tracing")
    The backward compatible option "--enable-trace-backend" is removed by
        10229ec3b0ff ("configure: remove backwards-compatibility and obsolete 
options")
    
    As we already use ./configure options that wouldn't be accepted by
    older version of QEMU's configure, we will simply use the new spelling
    for the option and avoid trying to detect which spelling to use.
    
    We already make use if "--firmwarepath=" which was introduced by
        3d5eecab4a5a ("Add --firmwarepath to configure")
    which already include the new spelling for "--enable-trace-backends".
    
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Reviewed-by: Jason Andryuk <jandryuk@xxxxxxxxx>
    master commit: e66d450b6e0ffec635639df993ab43ce28b3383f
    master date: 2023-01-11 10:45:29 +0100
---
 tools/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/Makefile b/tools/Makefile
index 757a560be0..9b6b605ec9 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -218,9 +218,9 @@ subdir-all-qemu-xen-dir: qemu-xen-dir-find
        mkdir -p qemu-xen-build; \
        cd qemu-xen-build; \
        if $$source/scripts/tracetool.py --check-backend --backend log ; then \
-               enable_trace_backend='--enable-trace-backend=log'; \
+               enable_trace_backend="--enable-trace-backends=log"; \
        elif $$source/scripts/tracetool.py --check-backend --backend stderr ; 
then \
-               enable_trace_backend='--enable-trace-backend=stderr'; \
+               enable_trace_backend='--enable-trace-backends=stderr'; \
        else \
                enable_trace_backend='' ; \
        fi ; \
--
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