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Re: --make and -main-is still not working together?: msg#00065

lang.haskell.glasgow.bugs

Subject: Re: --make and -main-is still not working together?

> I can't reproduce this failure:
>
> ~/scratch > cat ModName/Main.hs
> module ModName.Main where
> main=print "hello"
> ~/scratch > ghc -o out --make ModName/Main.hs -main-is ModName.Main.main
> Chasing modules from: ModName/Main.hs
> Skipping ModName.Main ( ModName/Main.hs, ModName/Main.o )
> Linking ...
>
> This is 6.4 on x86/Linux. Is there anything I'm missing?

Actually, i reproduced it now and the reason is a bit different. I have an
application Test and Test2. They both have a main function. Test imports Test2
for some other function. So this is how those files look like:

~/pancake > cat Test.hs
module Test where
import Test2 hiding (main)

main = doit

~/pancake > cat Test2.hs
module Test2 where

doit = print "Test2.doit"
main = print "Test2.main"

I then first compile the first app:
~/pancake > ghc --make -main-is Test.main Test.hs
Chasing modules from: Test.hs
Compiling Test2 ( ./Test2.hs, ./Test2.o )
Compiling Test ( Test.hs, Test.o )
Linking ...

then i compile the second app:
~/pancake > ghc --make -main-is Test2.main Test2.hs
Chasing modules from: Test2.hs
Skipping Test2 ( Test2.hs, Test2.o )
Linking ...
/usr/lib/ghc-6.4/libHSrts.a(Main.o)(.text+0xe): In function `main':
: undefined reference to `__stginit_ZCMain'
/usr/lib/ghc-6.4/libHSrts.a(Main.o)(.text+0x28): In function `main':
: undefined reference to `ZCMain_main_closure'
collect2: ld returned 1 exit status

So I guess generating Test2.o the first time and using -main-is renamed the main
in Test2.o . Since it is not recompiled when I want to compile the second app,
it fails because it cant find the main...I thought providing a -main-is flag
again when compiling the second app would somehow force recompilation of Test2.o
or at least fixing the 'renaming' that the first compilation of Test2.o had
caused.

greetings, Niels.


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