Link-Time Undefined Reference Errors

[pgj]

An undefined reference error is generated on FreeBSD at linking time when using dynamic libraries. It is because of the visibility attributes of GCC. FreeBSD 8.x includes GCC 4.2.1 in the base system, which behaves badly when the #pragma GCC visibility push(hidden) line is present, it might refer to an OS-specific error.

Regarding the given problem, here is an excerpt from the testing log on FreeBSD:

=====> arith001(dyn) 624 of 2520 [0, 43, 0]
cd ./numeric/should_run && '/usr/home/ghc-builder/work/builder/tempbuild/build/bindisttest/install dir/bin/ghc' -fforce-recomp -dcore-lint -dcmm-lint -no-user-package-conf -rtsopts -dno-debug-output -o arith001 arith001.hs -O -dynamic >arith001.comp.stderr 2>&1
Compile failed (status 256) errors were:
[1 of 1] Compiling Main ( arith001.hs, arith001.o )
Linking arith001 ...
/usr/home/ghc-builder/work/builder/tempbuild/build/bindisttest/install dir/lib/ghc-6.13.20100717/unix-2.4.0.1/libHSunix-2.4.0.1-ghc6.13.20100717.so: undefined reference to `genericRaise'
*** unexpected failure for arith001(dyn)

It happens for both  i386 and  amd64.

[pgj]

A patch for fixing symbol visibility problems on FreeBSD

[igloo]

Patch applied, thanks!