[Haskell-cafe] how ghc finds libgmp.so when linking

[Johannes Waldmann]

Hi.

I have some obsolete libgmp in /usr/lib,
and the correct one in /usr/local/lib,
but ghc does not find it,
resp., finds the /usr/lib one earlier,
and this is missing some symbols

/usr/local/lib/ghc-7.10.3/integ_2aU3IZNMF9a7mQ0OzsZ0dS/libHSinteger-gmp-1.0.0.0-2aU3IZNMF9a7mQ0OzsZ0dS.a(wrappers.o):
In function `integer_gmp_mpn_xor_n':
wrappers.c:(.text+0x1761): undefined reference to `__gmpn_xor_n'

when I put  ghc ... -optl -Wl,--verbose   I see that:

SEARCH_DIR("/usr/i486-linux-gnu/lib32"); SEARCH_DIR("/usr/local/lib32");
SEARCH_DIR("/lib32"); SEARCH_DIR("/usr/lib32");
SEARCH_DIR("/usr/i486-linux-gnu/lib"); SEARCH_DIR("/usr/local/lib");
SEARCH_DIR("/lib"); SEARCH_DIR("/usr/lib");

but that's apparently not what's happening.

Is  ghc  changing this, and how can I work around it?

- J.W.