[Bug gprofng/29364] libgprofng.so: needs to link against -pthread

[vladimir.mezentsev at oracle dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29364

--- Comment #1 from Vladimir Mezentsev <vladimir.mezentsev at oracle dot com> 
---

We build with $(PTHREAD_CFLAGS) and link with $(PTHREAD_LIBS)
We use AX_PTHREAD in gprofng/configure.ac to set up PTHREAD_CFLAGS and
PTHREAD_LIBS.

I see in build that PTHREAD_CFLAGS is set correctly but PTHREAD_LIBS is always
empty:

% egrep -ns '"PTHREAD_CFLAGS"|"PTHREAD_LIBS"' */config.status
gdb/config.status:745:S["PTHREAD_CFLAGS"]="-pthread"
gdb/config.status:746:S["PTHREAD_LIBS"]=""
gdbserver/config.status:660:S["PTHREAD_CFLAGS"]="-pthread"
gdbserver/config.status:661:S["PTHREAD_LIBS"]=""
gdbsupport/config.status:633:S["PTHREAD_CFLAGS"]="-pthread"
gdbsupport/config.status:634:S["PTHREAD_LIBS"]=""
gprofng/config.status:888:S["PTHREAD_CFLAGS"]="-pthread"
gprofng/config.status:889:S["PTHREAD_LIBS"]=""
libbacktrace/config.status:876:S["PTHREAD_CFLAGS"]="-pthread"


It looks like the bug is in AX_PTHREAD (config/ax_pthread.m4).

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