name:           entropy
version:        0.4.1.5
description:    A mostly platform independent method to obtain cryptographically strong entropy
                (RDRAND, urandom, CryptAPI, and patches welcome)
                Users looking for cryptographically strong (number-theoretically
                sound) PRNGs should see the 'DRBG' package too.
synopsis:       A platform independent entropy source
license:        BSD3
license-file:   LICENSE
copyright:      Thomas DuBuisson <thomas.dubuisson@gmail.com>
author:         Thomas DuBuisson <thomas.dubuisson@gmail.com>
maintainer:     Thomas DuBuisson <thomas.dubuisson@gmail.com>
category:       Data, Cryptography
homepage:       https://github.com/TomMD/entropy
bug-reports:    https://github.com/TomMD/entropy/issues
stability:      stable

-- build-type:  Simple
-- ^^ Used for HaLVM
build-type:     Custom

-- ^^ Test for RDRAND support using 'ghc'
cabal-version:  >=1.10
tested-with:    GHC == 8.2.2
-- data-files:
extra-source-files:   ./cbits/rdrand.c, ./cbits/rdrand.h, README.md

-- Notice to compile  with HaLVM the above 'build-type' must be changed
-- to 'Simple' instead of 'Custom'.  The current build system naively
-- runs GHC to determine if the compiler supports RDRAND before proceeding.
flag halvm
    description:        Build for the HaLVM
    default:            False


custom-setup
  setup-depends: Cabal >= 1.10 && < 3.1
               , base < 5
               , filepath < 1.5
               , directory < 1.4
               , process < 1.7

library
  ghc-options:  -O2
  exposed-modules: System.Entropy
  if impl(ghcjs)
    other-modules: System.EntropyGhcjs
  else {
    if os(windows)
      other-modules: System.EntropyWindows
    else {
         if os(halvm)
           other-modules: System.EntropyXen
         else
           other-modules: System.EntropyNix
    }
  }
  other-extensions:    CPP, ForeignFunctionInterface, BangPatterns,
                       ScopedTypeVariables
  build-depends:       base >= 4.8 && < 5, bytestring

  default-language:    Haskell2010
  
  if impl(ghcjs) {
    build-depends:     ghcjs-dom
                     , jsaddle
  }
  else {
    if(os(halvm))
      cpp-options: -DXEN -DHAVE_RDRAND
      cc-options:  -DXEN -DHAVE_RDRAND
    if arch(x86_64)
      cpp-options: -Darch_x86_64
      cc-options:  -Darch_x86_64 -O2
      -- gcc 4.8.2 on i386 fails to compile rdrand.c when using -fPIC!
      c-sources:    cbits/rdrand.c
      include-dirs: cbits
    if arch(i386)
      cpp-options: -Darch_i386
      cc-options:  -Darch_i386 -O2
    if os(windows)
      build-depends: Win32 >= 2.5
      cpp-options: -DisWindows
      cc-options:  -DisWindows
      extra-libraries: advapi32
    else
      if !os(halvm)
         Build-Depends: unix
  }


source-repository head
    type:       git
    location:   https://github.com/TomMD/entropy