From: "Dave Yeo" <gnuports@2rosenthals.com>
To: GNU Ports for eCS Mailing List <gnuports@2rosenthals.com>
Subject: _beginthread not declared
Message-ID: <dac4e65d-611a-518b-881e-0285bc354f99@gmail.com>
Date: Sat, 9 May 2020 20:56:06 -0700
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Hi, trying to test build aom, https://aomedia.googlesource.com/aom/ the 
build dies here, (after fixing the NASM obj format)

[ 68%] Building CXX object 
CMakeFiles/test_aom_encoder.dir/test/horz_superres_te
st.cc.o
In file included from K:/work/aom/av1/common/av1_common_int.h:19,
                  from K:/work/aom/av1/encoder/encoder.h:23,
                  from K:/work/aom/test/horz_superres_test.cc:18:
K:/work/aom/aom_util/aom_thread.h: In function 'int pthread_create(TID*, 
const void*, void* (*)(void*), void*)':
K:/work/aom/aom_util/aom_thread.h:186:20: error: '_beginthread' was not 
declared in this scope
   186 |   tid = (pthread_t)_beginthread(thread_start, NULL, 1024 * 
1024, targ);      |                    ^~~~~~~~~~~~
make[2]: *** 
[CMakeFiles/test_aom_encoder.dir/test/horz_superres_test.cc.o] Error 1
make[1]: *** [CMakeFiles/test_aom_encoder.dir/all] Error 2
make: *** [all] Error 2

Which I don't understand as stdlib.h is included and that should declare 
_beginthread.
Code is here, 
https://aomedia.googlesource.com/aom/+/refs/heads/master/aom_util/aom_thread.h 
with OS/2 section starting at line 141.
There are also lots of related warnings like

In file included from K:/work/aom/av1/common/av1_common_int.h:19,
                  from K:/work/aom/av1/encoder/x86/encodetxb_sse2.c:17:
K:/work/aom/aom_util/aom_thread.h: In function 'pthread_create':
K:/work/aom/aom_util/aom_thread.h:186:20: warning: implicit declaration 
of function '_beginthread' [-Wimplicit-function-declaration]
   186 |   tid = (pthread_t)_beginthread(thread_start, NULL, 1024 * 
1024, targ);      |                    ^~~~~~~~~~~~

Dave

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