Fix libuwind target with pthreads

[jonringer]

To fix:

In file included from ../include/libunwind_i.h:52,
                 from os-linux.c:29:
../include/pthread.h:37:10: fatal error: pthread_compat.h: No such file or directory
   37 | #include "pthread_compat.h"
      |          ^~~~~~~~~~~~~~~~~~
compilation terminated.

[veehaitch]

Thanks 🙏🏻

I believe Intel is going to insist on the Signed-off-by trailer at the end of the commit log message.

[lzha101]

One question, are you parallelly building the sdk via make -jN? In the cpprt Makefile,

linux-sgx/sdk/cpprt/Makefile

Lines 75 to 81 in 2ee53db

	prepare-libunwind:
	$(CP) linux/pthread_compat.h $(LIBUNWIND_DIR)/include
	$(CPPRT): $(OBJS) prepare-libunwind libunwind
	$(CP) $(LIBUNWIND_DIR)/src/.libs/libunwind.a $(CPPRT)
	$(AR) rs $@ $(OBJS)

You can see the pthread_compat.h will be copied to sdk/cpprt/linux/libunwind/include. If you are building the SDK with make -j, we can just change the upper Makefile to make sure the order that the copy action is before libunwind build.
I guess we not adding sdk/cpprt/linux to the libunwind Makefile is to avoid wrong header file included by mistake as you can see there are some header files in both sdk/cpprt/linux and sdk/cpprt/linux/libunwind/include, such as unwind.h.

[jonringer]

If you are building the SDK with make -j

Yes, I'm doing make -j32 -l32

[lzha101]

@jonringer Can you try to change the Makefile

linux-sgx/sdk/cpprt/Makefile

Lines 78 to 80 in 2ee53db

	$(CPPRT): $(OBJS) prepare-libunwind libunwind
	$(CP) $(LIBUNWIND_DIR)/src/.libs/libunwind.a $(CPPRT)
	$(AR) rs $@ $(OBJS)

to:

$(CPPRT): $(OBJS) prepare-libunwind
        $(Make) libunwind
	$(CP) $(LIBUNWIND_DIR)/src/.libs/libunwind.a $(CPPRT)
	$(AR) rs $@ $(OBJS)

And see if the above change could fix your problem?