libgmp in non-standard location

[Jan von Löwenstein]

Hi, 

When I compile libgmp to a non-standard location, install a specific ghc version (into a non-standard location) to use with `stack --system-ghc` and then `stack build` my code and its dependencies using `--extra-lib-dirs` and `--extra-include-dirs`. Should that work? 

I get complaints from `ld` that it can't find `-Lgmp`. Apparently there is some validation step that attempts to link against gmp in order to, well, validate linking will work at runtime? 

Some additional questions that came to my mind:

How would I ensure GHC itself can find libgmp (assuming there is usage of that in GHC code itself)? 

Do I have to ensure that my compiled code finds libgmp in the non-standard location and how would I do it? 

I did some googling on that but I am admittedly new to low level systems/compilation stuff so I easily got lost. 

Hopefully someone can help me out on that. 

Best regards, 

Jan 

[Michael Snoyman]

I'm not expert on this, but I believe you'll need to set LD_CONFIG appropriately instead of using --extra-lib-dirs. The --extra-lib-dirs is not used during GHC sanity check if I remember correctly.

Jan 

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[Jan von Löwenstein]

For now I solved it with LD_LIBRARY_PATH & LIBRARY_PATH (see https://github.com/SAP/bosh-kubernetes-cpi-release/blob/master/packages/bosh_kubernetes_cpi/packaging#L12-L13)

I suppose I could leave one of them out.

As far as I tried that no requirement for running the resulting binary.

Michael Snoyman <michael...@gmail.com> schrieb am Mi., 26. Juli 2017, 07:05:

I'm not expert on this, but I believe you'll need to set LD_CONFIG appropriately instead of using --extra-lib-dirs. The --extra-lib-dirs is not used during GHC sanity check if I remember correctly.

On Sun, Jul 23, 2017 at 11:56 PM, Jan von Löwenstein <jan.loe...@gmail.com> wrote:

Hi, 

When I compile libgmp to a non-standard location, install a specific ghc version (into a non-standard location) to use with `stack --system-ghc` and then `stack build` my code and its dependencies using `--extra-lib-dirs` and `--extra-include-dirs`. Should that work? 

I get complaints from `ld` that it can't find `-Lgmp`. Apparently there is some validation step that attempts to link against gmp in order to, well, validate linking will work at runtime? 

Some additional questions that came to my mind:

How would I ensure GHC itself can find libgmp (assuming there is usage of that in GHC code itself)? 

Do I have to ensure that my compiled code finds libgmp in the non-standard location and how would I do it? 

I did some googling on that but I am admittedly new to low level systems/compilation stuff so I easily got lost. 

Hopefully someone can help me out on that. 

Best regards, 

Jan 

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