in-tree GMP build problem with shared libraries

[simonmar]

Reported by Vivian McPhail? <haskell.vivian.mcphail@…> on glasgow-haskell-users:

Trying to build rc1 from source

linux x86_64
BuildFlavour = perf

It seems that the -fPIC flag is set, but an error still occurs (
/usr/bin/ld: libraries/integer-gmp/gmp/objs/abs.o: relocation R_X86_64_32 against `.text' can not be used when making a shared object; recompile with -fPIC
)

"inplace/bin/ghc-stage1" -fPIC -dynamic  -O -H64m    -package-name base-4.3.0.0 -hide-all-packages -i -ilibraries/base/. -ilibraries/base/dist-install/build -ilibraries/base/dist-install/build/autogen -Ilibraries/base/dist-install/build -Ilibraries/base/dist-install/build/autogen -Ilibraries/base/include   -optP-DOPTIMISE_INTEGER_GCD_LCM -optP-include -optPlibraries/base/dist-install/build/autogen/cabal_macros.h -package ghc-prim-0.2.0.0 -package integer-gmp-0.2.0.2 -package rts-1.0  -package-name base -XMagicHash -XExistentialQuantification -XRank2Types -XScopedTypeVariables -XUnboxedTuples -XForeignFunctionInterface -XUnliftedFFITypes -XDeriveDataTypeable -XGeneralizedNewtypeDeriving -XFlexibleInstances -XStandaloneDeriving -XPatternGuards -XEmptyDataDecls -XNoImplicitPrelude -XCPP -no-user-package-conf -rtsopts -O2 -XGenerics -fno-warn-deprecated-flags     -odir libraries/base/dist-install/build -hidir libraries/base/dist-install/build -stubdir libraries/base/dist-install/build -hisuf dyn_hi -osuf  dyn_o -hcsuf dyn_hc -c libraries/base/./Data/Typeable.hs-boot -o libraries/base/dist-install/build/Data/Typeable.dyn_o-boot
/usr/bin/ld: libraries/integer-gmp/gmp/objs/abs.o: relocation R_X86_64_32 against `.text' can not be used when making a shared object; recompile with -fPIC
libraries/integer-gmp/gmp/objs/abs.o: could not read symbols: Bad value
collect2: ld returned 1 exit status
make[1]: *** [libraries/integer-gmp/dist-install/build/libHSinteger-gmp-0.2.0.2-ghc7.0.0.20100924.so] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [all] Error 2

[igloo]

#4374 would effectively fix this.