[libvirt] [PATCH] tests: improve build time for qemuxml2argvtest
Ján Tomko
jtomko at redhat.com
Wed Nov 27 19:38:39 UTC 2019
On Wed, Nov 27, 2019 at 04:22:42PM +0000, Daniel P. Berrangé wrote:
>On Fedora 31 with GCC 9.2.1, compiling qemuxml2argvtest takes
>about 36 seconds since
>
> commit 30c6d99209cd36bba8e14795622f658827698522
> Author: Jiri Denemark <jdenemar at redhat.com>
> Date: Thu Oct 24 17:51:42 2019 +0200
>
> qemuxml2argvtest: Update host arch for DO_TEST*ARCH* tests
>
>The optimizer is hitting some pathelogical performance behaviour due to
*pathological
>the high number of branches in the mymain() method.
>
Missing bugzilla link:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58479
>Pushing the branch tests down into the testCompareXMLToArgv method
>brings the compile time down to 3 seconds.
>
-fno-var-tracking-assignments brings it down even more for me
Can we turn the flag off for tests?
Jano
>Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
>---
> tests/qemuxml2argvtest.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
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