Re: [PATCH] configure: Improve zstd test

[Juan Quintela <quintela@redhat.com>]

Michal Prívozník <mprivozn@redhat.com> wrote:
> On 5. 3. 2020 16:27, Juan Quintela wrote:
>> Alex Bennée <alex.bennee@linaro.org> wrote:
>>> Juan Quintela <quintela@redhat.com> writes:
>>>
>>>> There were one error on the test (missing an s for --exists).
>>>> But we really need a recent zstd (0.8.1).
>>>> That version was released in 2016, so it is newer that some of our travis
>>>> images.  Just check for the version that we need.
>>>>
>>>> Signed-off-by: Juan Quintela <quintela@redhat.com>
>>>> Reported-by: Richard Henderson <richard.henderson@linaro.org>
>>>> ---
>>>>  configure | 3 ++-
>>>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/configure b/configure
>>>> index 7b373bc0bb..1bf48df1ef 100755
>>>> --- a/configure
>>>> +++ b/configure
>>>> @@ -2464,7 +2464,8 @@ fi
>>>>  # zstd check
>>>>  
>>>>  if test "$zstd" != "no" ; then
>>>> -    if $pkg_config --exist libzstd ; then
>>>> +    libzstd_minver="0.8.1"
>>>> +    if $pkg_config --atleast-version=$libzstd_minver libzstd ; then
>>>>          zstd_cflags="$($pkg_config --cflags libzstd)"
>>>>          zstd_libs="$($pkg_config --libs libzstd)"
>>>>          LIBS="$zstd_libs $LIBS"
>>>
>>> Hmm still breaks with:
>>>
>>>    make docker-test-build@ubuntu J=9 V=1
>> 
>> Thanks.
>> 
>>> With:
>>>
>>>   FY_SOURCE=2 -g   -c -o monitor/qmp.o /tmp/qemu-test/src/monitor/qmp.c
>>>   /tmp/qemu-test/src/migration/multifd-zstd.c: In function 'zstd_send_prepare':
>>>   /tmp/qemu-test/src/migration/multifd-zstd.c:125:9: error: unknown type name 'ZSTD_EndDirective'; did you mean 'ZSTD_DDict'?
>>>            ZSTD_EndDirective flush = ZSTD_e_continue;
>>>            ^~~~~~~~~~~~~~~~~
>> 
>> Greate, more things were introduced later.
>> As it would be too easy, the zstd repository is not lineal, you need to
>> checkout the tag you want to see when something has been introduced.
>> 
>> Will try to get this fixed.
>> 
>> Sorry for the inconveniences.
>> 
>> 
>>>   Version: 1.3.8+dfsg-3
>>>   Depends: libzstd1 (= 1.3.8+dfsg-3)
>>>   Description: fast lossless compression algorithm -- development files
>> 
>> I don't undertsand now.
>> 
>> ZSTD_EndDirective was included in 1.3.0.
>> 
>> I can just change that for 1.3.9, but I don't know why is that there.
>> Could you do a grep ZSTD_EndDirective /usr/lib/zstd.h?
>
> Thing is, they have so called experimental APIs. You get them only if
> you define ZSTD_STATIC_LINKING_ONLY before including zstd.h. So the
> plain grep of a symbol tells us nothing. We need to check if it's not in
> #ifdef. Looks like 1.3.9 is the minimal version which has everything we
> want.

So easy!!!!!

I was arriving to that conclusion after brute force.

Later, Juan.