[GHC] #8748: ghc-7.8-rc1/HEAD: --enable-unregisterised fails to build: threaded RTS, profiling mode

[GHC]

#8748: ghc-7.8-rc1/HEAD: --enable-unregisterised fails to build: threaded RTS,
profiling mode
------------------------------------+-------------------------------------
       Reporter:  slyfox            |             Owner:
           Type:  bug               |            Status:  new
       Priority:  high              |         Milestone:  7.8.1
      Component:  Compiler          |           Version:  7.6.3
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 Steps to reproduce:

 {{{
 0. Pick any platform. I've performed it on amd64, but seen real failures
 on unreg arches: ia64, ppc64
 1. pull sources
 2. ./boot
 3. ./configure --enable-unregisterised
 # right, no build.mk
 4. make
 }}}

 Here we see 2 kinds of bugs at once:

 1. threaded RTS misses '''-DNOSMP''' define. Looks like ghc always needs
    to carry that define (what is the mechanism for it BTW?), it
    doesn't:
 {{{
   HC [stage 1] compiler/stage2/build/ExtsCompat46.o

 In file included from /home/slyfox/dev/git/ghc/includes/Stg.h:232:0:
     0,
                      from /tmp/ghc6527_0/ghc6527_2.hc:3:

 /home/slyfox/dev/git/ghc/includes/stg/Regs.h:443:2:
      error: #error BaseReg must be in a register for THREADED_RTS
      #error BaseReg must be in a register for THREADED_RTS
       ^
 }}}

 The implicit declarations are scary as well:
 {{{
 /tmp/ghc1420_0/ghc1420_2.hc: In function 'c7WZ_entry':

 /tmp/ghc1420_0/ghc1420_2.hc:43:1:
      warning: implicit declaration of function 'hs_bswap64' [-Wimplicit-
 function-declaration]
      _c7X5 = hs_bswap64(*((P_)(R1.w+7)));
      ^
 }}}

 I naively tried naive approach:
 {{{
 mk/config.mk.in:

 +# Unregisterised build calls c compiler for every
 +# .hs file. thus pass it everywhere.
 +ifneq "$(GhcWithSMP)" "YES"
 +SRC_HC_OPTS += -optc-DNOSMP
 +endif
 }}}
 but got stage2, which always '''SIGSEGV'''s.
 Thus it's either incorrect fix or '''UNREG''' is broken.

 2. profiling builds (all files with -prof) miss '''enterFunCCS'''
 declaration:
 {{{
 /tmp/ghc7183_0/ghc7183_1.p_hc: In function 's6Y_entry':

 /tmp/ghc7183_0/ghc7183_1.p_hc:79:40:
      error: 'enterFunCCS' undeclared (first use in this function)
      ghcFunPtr = ((void (*)(void *, void *))enterFunCCS);
                                             ^
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8748>
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