hoogle: failed to build

[pjrt]

Description

I tried to build hoogle (sha: fca9b98652540ac513af99cca0c103ac83444b5c) with etlas build. Got the following error:

Building library for mmap-0.5.9..
[1 of 1] Compiling System.IO.MMap  eta: panic! (the 'impossible' happened)
  (Eta version 0.8.6b5):
	tcCheckFIType: Unsupported calling convention.
  ccall unsafe "value HsMmap.h system_io_mmap_granularity"

Please report this as a Eta bug: http://github.com/typelead/eta/issues

etlas: Failed to build mmap-0.5.9 (which is required by exe:hoogle from
hoogle-5.0.17.6). See the build log above for details.

Steps to Reproduce

1. Clone the hoogle repo
2. run etlas build

Context

Your Environment

etlas version 1.5.0.0
compiled using version 2.1.0.0 of the etlas-cabal library 

$ uname -a
Linux <HOSTNAME> 5.0.6-arch1-1-ARCH #1 SMP PREEMPT Wed Apr 3 09:35:20 UTC 2019 x86_64 GNU/Linux

[jneira]

Hi, i am afraid that the mmap package has a lot of calls to c funtions and eta does not support them. Either the mmap package should be patched (see https://github.com/typelead/eta-hackage/tree/master) replacing c calls with java ones or hoogle itself should be patched replacing the calls to mmap package.

[vmchale]

perhaps the error message could be rewritten? If this is not an eta bug, the compiler need not report it as such

[jneira]

yeah, it could be a specific, more helpful error. But i would like to implicitly translate c imports to java ones, like ghcjs, so patching would be easier: #966