#5528: mkExtraObjToLinkIntoBinary invokes cc differently
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Reporter: MtnViewMark | Owner:
Type: bug | Status: new
Priority: normal | Component: Driver
Version: 7.0.2 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: GHC doesn't work at all
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When GHC is performing a final link of an executable, it invokes
mkExtraObjToLinkIntoBinary (in DriverPipeline.hs) to compile a small file
that encodes things like the -rtsopts option (among other things). That
calls mkExtraCObj in turn (it's the only caller) which uses SysTools.runCc
to invoke the host compiler.
However, runCc extracts the executable name and arguments from the command
line options from the sPgm_c :: (String, [Option]) field of Settings.
However, the -optc option doesn't append its argument to sPgm_c's [Option]
list, and so runCc, and hence the compilation in mkExtraCObj doesn't get
the benefit of the -optc argument.
Contrast this to the handling of the -pgmP and -optP options, where -optP
*does* append onto sPgm_P's [Option] list.
Now, it turns out that the -optc flags are used, but only in the more
complex doCpp and runPhase functions (which are the only two other calls
to runCc). So either a) -optc should add onto sPgm_c's [Option] list, or
b) mkExtraCObj should call one of doCpp or runPhase. In the first case,
then handling of the -optc options would need to be removed from doCpp and
runPhase (since they would be handled by runCc, getting them via sPgm_c
(it already tries to!)). This may not look safe to factor out of doCpp,
but inspection will see that it is (the two Bool args are only called
True/False, or False/True...)
WHY DOES THIS MATTER? A fine question to ask at this point.... If you are
compiling in an environment in which the compiler will need an extra
argument (say /usr/include isn't around and you need -I/somewhere-else),
then you'd expect to set this -optc -- only it won't get used for that one
compile generated at final link (for the rtsopts). This will cause your
compile to fail.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5528>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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