hsc2hs breaks with `--cflag=-Werror` in cross-compilation mode

I would like to be able to do

config_args='--target=i386-unknown-linux --with-gcc=i386-unknown-linux-gcc' ./validate

to validate a 32-bit GHC on a 64-bit Linux system. (I don't know why I have to specify --with-gcc in addition to --target; an unrelated mystery.)

However validate sets -Werror and the C code that hsc2hs generates in cross-compilation mode is not always warning-free, e.g.,

Files.hsc: In function ‘_hsc2hs_test’:
Files.hsc:81:14: error: variable ‘test_array’ set but not used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

so hsc2hs draws incorrect conclusions from its tests.

Either the hsc2hs-generated C code should be made (and kept) warning-free, or perhaps hsc2hs should append -Wwarn to the options that it passes to the C compiler.

Trac metadata

Trac field	Value
Version	7.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	hsc2hs
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