#2933: LDFLAGS ignored by build system
--------------------+-------------------------------------------------------
Reporter: duncan | Owner:
Type: bug | Status: new
Priority: normal | Component: Build System
Version: 6.10.1 | Severity: normal
Keywords: | Testcase:
Os: Solaris | Architecture: Unknown/Multiple
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I have required libs installed in `/opt/csw/lib` which is not on the
ordinary system linker path. This includes things like `libgmp` etc. That
means that to link ghc I want to pass `-R/opt/csw/lib` so that at runtime
I do not need to set `LD_LIBRARY_PATH`.
The `./configure --help` mentions `LDFLAGS` however this is ignored. When
building gcc the equivalent makes everything work out fine. It would be
nice if this were supported.
Note also that `--with-gmp-includes` and `--with-gmp-libraries` are only
half helpful. They add -L and -I options during the build only. That lets
ghc link stuff using gmp. There are still two problems however:
* Running such programs does not work if the gmp lib dir is not on the
standard runtime linker path (which is quite likely given that it was not
on the standard compile-time linker path).
* It does not cause the final built ghc to automatically use
-L/path/to/gmp/lib. Again I think if it's using `-L/path/to/gmp/lib` it
should also use `-R/path/to/gmp/lib` or it'll link but not run.
Some people claim that -R is evil. If we think it is evil and we choose
not to use it for `--with-gmp-includes` and `--with-gmp-libraries` then
those two become less than useful and it becomes more important to support
`LD_OPTIONS`/`LDFLAGS` properly so that distros like the Solaris CSW can
use it. For example, see http://www.opencsw.org/standards/pkg-walkthrough
which recommends:
{{{
export LD_OPTIONS='-R/opt/csw/lib/$ISALIST -R/opt/csw/lib -L/opt/csw/lib'
}}}
Note: the workaround is to modify the driver script of the bootstrapping
ghc and add `-optl-R/the/extra/lib` and then do the same for the script
template that will get used by the stage1/2 inplace and final ghc, or to
temporarily use LD_LIBRARY_PATH and modify the final ghc driver script
during/after install.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2933>
GHC <http://www.haskell.org/ghc/>
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