Building head on Openbsd

[Adam Steen]

Hi

I attempt to build head today on OpenBSD current and failed, but i not sure
where to start to fix the problems. The full configure and build logs are
attached. Just a note: ghc-8.0 builds fine, ghc-8.2 fails with the same
error.

the first error is

"inplace/bin/ghc-stage1" -optc-std=gnu99 -optc-fno-stack-protector
-optc-Wall -optc-Wall -optc-Wextra -optc-Wstrict-prototypes
-optc-Wmissing-prototypes -optc-Wmissing-declarations -optc-Wi     nline
-optc-Waggregate-return -optc-Wpointer-arith -optc-Wmissing-noreturn
-optc-Wnested-externs -optc-Wredundant-decls -optc-Iincludes
-optc-Iincludes/dist -optc-Iincludes/dist-derivedcons     tants/header
-optc-Iincludes/dist-ghcconstants/header -optc-Irts -optc-Irts/dist/build
-optc-DCOMPILING_RTS -optc-fno-strict-aliasing -optc-fno-common
-optc-Irts/dist/build/./autogen -optc-     O2 -optc-fomit-frame-pointer
-optc-g -optc-DRtsWay=\"rts_v\" -optc-ffunction-sections
-optc-fdata-sections -static  -H32m -O -Wall   -Iincludes -Iincludes/dist
-Iincludes/dist-derivedconsta     nts/header
-Iincludes/dist-ghcconstants/header
-Irts -Irts/dist/build -DCOMPILING_RTS -this-unit-id rts -dcmm-lint      -i
-irts -irts/dist/build -Irts/dist/build -irts/dist/build/./autogen
 -Irts/dist/build/./autogen           -O2    -Wnoncanonical-monad-instances
 -c rts/Timer.c -o rts/dist/build/Timer.o
 In file included from rts/posix/Signals.h:13,
                  from rts/RtsSignals.h:14,

                  from rts/Timer.c:26:0: error:

 /usr/include/signal.h:72:0: error:
      warning: redundant redeclaration of '__errno'
    |
72 | extern int *__errno(void);
    | ^

and the last error is

rts/linker/Elf.c:539:0: error:  warning: unused variable 'secno'
    |
539 |          Elf_Word secno = stab[j].st_shndx;
    | ^
`gcc' failed in phase `C Compiler'. (Exit code: 1)
gmake[1]: *** [rts/ghc.mk:248: rts/dist/build/linker/Elf.o] Error 1
gmake: *** [Makefile:127: all] Error 2
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