basic incomplete NetBSD support

[Thomas Klausner]

Hi!

Since it looked like I would need D for a project, I started porting
it to NetBSD. The project has been cancelled in the meantime, but I
don't want my patches to be lost, so I offer them here for inclusion.

Most of the time, NetBSD can be handled just like FreeBSD. Following
this rule, I got dmd to compile rather quickly; however, I didn't get
it to compile a simple d program.

# cat foo.d
int main() { return 42; }
# cat /tmp/dd                                                                  
./work/dmd2/src/dmd/dmd -Iwork/dmd2/src/druntime/import -Iwork/dmd2/src/phobos/ foo.d -L-Lwork/dmd2/src/phobos/generated/freebsd/release
# sh /tmp/dd
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(thread_e9_897.o): In function `thread_suspendHandler':
src/core/thread.d:(.text.thread_suspendHandler+0x91): warning: warning: reference to compatibility sigsuspend(); include <signal.h> for correct reference
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(runtime_d7_76e.o): In function `runModuleUnitTests':
src/core/runtime.d:(.text.runModuleUnitTests+0x4d): warning: warning: reference to compatibility sigaction(); include <signal.h> for correct reference
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(thread_eb_258.o): In function `_D4core6thread6Thread5sleepFS4core4time8DurationZv':
src/core/thread.d:(.text._D4core6thread6Thread5sleepFS4core4time8DurationZv+0x65): warning: warning: reference to compatibility nanosleep(); include <time.h> to generate correct reference
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(thread_e9_897.o): In function `thread_suspendHandler':
src/core/thread.d:(.text.thread_suspendHandler+0x74): warning: warning: reference to compatibility sigdelset(); include <signal.h> for correct reference
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(runtime_d7_76e.o): In function `runModuleUnitTests':
src/core/runtime.d:(.text.runModuleUnitTests+0x23): warning: warning: reference to compatibility sigfillset(); include <signal.h> for correct reference
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(memory_568_620.o): In function `_D2rt6memory16initStaticDataGCFZv':
src/rt/memory.d:(.text._D2rt6memory16initStaticDataGCFZv+0x7): undefined reference to `__data_start'
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(runtime_d7_76e.o): In function `_D4core7runtime18runModuleUnitTestsUZb19unittestSegvHandlerUiPS4core3sys5posix6signal9siginfo_tPvZv':
src/core/runtime.d:(.text._D4core7runtime18runModuleUnitTestsUZb19unittestSegvHandlerUiPS4core3sys5posix6signal9siginfo_tPvZv+0x28): undefined reference to `backtrace'
src/core/runtime.d:(.text._D4core7runtime18runModuleUnitTestsUZb19unittestSegvHandlerUiPS4core3sys5posix6signal9siginfo_tPvZv+0x38): undefined reference to `backtrace_symbols_fd'
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(memory_566_5d0.o): In function `rt_stackBottom':
src/rt/memory.d:(.text.rt_stackBottom+0x4): undefined reference to `__libc_stack_end'
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(runtime_d8_792.o): In function `_D4core7runtime19defaultTraceHandlerFPvZC6object9Throwable9TraceInfo16DefaultTraceInfo6__ctorMFZC4core7runtime19defaultTraceHandlerFPvZC6object9Throwable9TraceInfo16DefaultTraceInfo':
src/core/runtime.d:(.text._D4core7runtime19defaultTraceHandlerFPvZC6object9Throwable9TraceInfo16DefaultTraceInfo6__ctorMFZC4core7runtime19defaultTraceHandlerFPvZC6object9Throwable9TraceInfo16DefaultTraceInfo+0x2b): undefined reference to `backtrace'
src/core/runtime.d:(.text._D4core7runtime19defaultTraceHandlerFPvZC6object9Throwable9TraceInfo16DefaultTraceInfo6__ctorMFZC4core7runtime19defaultTraceHandlerFPvZC6object9Throwable9TraceInfo16DefaultTraceInfo+0x3e): undefined reference to `backtrace_symbols'
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(dmain2_513_2f9.o): In function `rt_init':
src/rt/dmain2.d:(.text.rt_init+0x1c): undefined reference to `__data_start'
work/dmd2/src/phobos/generated/freebsd/release/libphobos2.a(thread_e8_713.o): In function `thread_entryPoint':
src/core/thread.d:(.text.thread_entryPoint+0x8a): undefined reference to `_pthread_cleanup_push'
src/core/thread.d:(.text.thread_entryPoint+0xc7): undefined reference to `_pthread_cleanup_pop'
--- errorlevel 1

That's when I started looking at the runtime in more detail and found
that the header files (in C terms; is that the correct term for D?)
have cases for every operating system separately. The last patches in
the patch set started addressing this issue, but I got exhausted,
since basically I wanted to use the FreeBSD case for now and just add
NetBSD cases where needed (like for errno). It seems that my port is
using Linux as operating system (e.g. patch-bh changes the Linux case
to reduce errors), so I must have made an error in the operating
system checks as well.

My patchset against dmd.2.051.zip is attached. It touches some
Makefiles, which you can probably skip, and the patches for the
runtime definitely need more work.

Is someone interested in working on this? I'm not sure how much time I
can spend on this now, since, as I said, the project for which I
wanted dmd has been cancelled.

Cheers,
 Thomas
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