[patch #8186] ax_pthread adds -pthread when it should not on OSX when compiling with clang

[Bernd Kuhls]

Follow-up Comment #24, patch #8186 (project autoconf-archive):

Hi,

the latest version bump of the libmicrohttpd package to 0.9.50 included
bumping the serial of ax_pthread.m4 from 21 to 23.

This bump includes changes to the way configure looks for pthread support.

On Linux the macro _REENTRANT is now being searched for:
https://github.com/peti/autoconf-archive/commit/39683064bbccb4008f239262cb681a970bf53603#diff-851a07ee321dc42003ac94cf4a9628faR211
which fails at least on arc and blackfin.

Before the autoconf update _REENTRANT was not searched on Linux:
https://github.com/peti/autoconf-archive/commit/39683064bbccb4008f239262cb681a970bf53603#diff-851a07ee321dc42003ac94cf4a9628faL273

This leads to problems detected by the buildroot autobuilders on blackfin and
arc:

http://autobuild.buildroot.net/results/593/593b5050473a83a9ddcada9de39f8f14ab38d554//libmicrohttpd-0.9.50/config.log

configure:13932: checking whether pthreads work with -pthread
configure:14026:
/home/test/autobuild/instance-3/output/host/usr/bin/bfin-linux-uclibc-gcc
-std=gnu99 -o conftest -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64  -Os  -pthread -D_LARGEFILE_SOURCE
-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  conftest.c   >&5
conftest.c:30:26: error: #error "_REENTRANT must be defined"


http://autobuild.buildroot.net/results/ff0/ff058a378b91740b5b399f32a6b375fbc3c8df06//libmicrohttpd-0.9.50/config.log

configure:13984: checking for the pthreads library -lpthread
configure:14026:
/home/test/autobuild/instance-0/output/host/usr/bin/arc-linux-gcc -std=gnu99
-o conftest -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
-matomic -Os   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64  conftest.c -lpthread  >&5
conftest.c:30:26: error: #error "_REENTRANT must be defined"

Disabling ax_pthread_check_macro="_REENTRANT" for Linux fixed the problem.

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