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SubjectRe: perf build failure with newer glibc headers
Em Wed, Jun 12, 2019 at 03:23:12PM -0400, Laura Abbott escreveu:
> Hi,
> While doing some build experiments, I found a compile failure with perf and jvmti:
> BUILDSTDERR: gcc -Wp,-MD,./.xsk.o.d -Wp,-MT,xsk.o -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-jvmti/jvmti_agent.c:48:21: error: static declaration of 'gettid' follows non-static declaration
> BUILDSTDERR: 48 | static inline pid_t gettid(void)
> BUILDSTDERR: | ^~~~~~
> BUILDSTDERR: In file included from /usr/include/unistd.h:1170,
> BUILDSTDERR: from jvmti/jvmti_agent.c:33:
> BUILDSTDERR: /usr/include/bits/unistd_ext.h:40:16: note: previous declaration of 'gettid' was here
> BUILDSTDERR: 40 | extern __pid_t gettid (void) __THROW;
> BUILDSTDERR: | ^~~~~~
> This is with the newer glibc headers that came into Fedora earlier this week
> (glibc-2.29.9000-27.fc31) It looks like the newer headers now define gettid
> so the in file gettid no longer works. Note this was a custom build with
> jvmti enabled as regular Fedora doesn't have it enabled which is why this
> wasn't reported elsewhere.
> I don't know enough about either the glibc headers or perf to make a suggestion
> on how to fix this but I'm happy to test.

Bummer, I haven't noticed this because my fedora:rawhide perf build test
container wasn't building the jvmti code:

Makefile.config:925: No openjdk development package found, please install JDK package, e.g. openjdk-8-jdk, java-1.8.0-openjdk-devel


[perfbuilder@c0326e8b6511 perf]$ cat /tmp/build/perf/feature/test-jvmti.make.output
test-jvmti.c:2:10: fatal error: jvmti.h: No such file or directory
2 | #include <jvmti.h>
| ^~~~~~~~~
compilation terminated.
[perfbuilder@c0326e8b6511 perf]$

Installing it I get:

[root@2d7fe307ad20 perf]# rpm -qa | grep openjdk
[root@2d7fe307ad20 perf]# cat
[root@2d7fe307ad20 perf]# ls -la /tmp/build/perf/feature/test-jvmti.bin
-rwxr-xr-x. 1 root root 21592 Jun 12 20:48
[root@2d7fe307ad20 perf]#

And reproduce the problem you reported:

jvmti/jvmti_agent.c:48:21: error: static declaration of ‘gettid’ follows
non-static declaration
48 | static inline pid_t gettid(void)
| ^~~~~~
In file included from /usr/include/unistd.h:1170,
from jvmti/jvmti_agent.c:33:

So, we'll have to have a feature test, that defines some HAVE_GETTID
that then ifdefs out our inline copy, working on it.

Thanks for the report!

- Arnaldo

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