Use conda compiler toolchain for conda builds

For both libastra and astra-toolbox:

1) We do not use script_env to set CC/CXX anymore, since the compilers
   are installed by conda.
2) The build string is made useful by including either the python+numpy
   version or the cudatoolkit version that the package was built with.
3) Some clean-up of build.sh in buildenv/

For libastra:

1) The libastra.so is built with the conda C/C++ compiler
   toolchain. This has two benefits:
   1) The rpath of libastra.so is set to $ORIGIN, which makes linking
      easier for dependent packages.
   2) libastra.so is linkable against ancient versions of glibc. With
      old versions of memcpy.
2) The C/C++ compiler version is fixed to 5.4.0
3) In libastra/build.sh, we rename $CONDA_PREFIX to
   $PREFIX. Apparently, this is how it is supposed to be done. For me,
   $CONDA_PREFIX was suddenly undefined. Why this was not a problem
   before, is unclear to me.
4) The cudatoolkit runtime dependency is pinned with pin_compatible
5) The libastra conda package now provides headers and .pc file. This
   is useful for building C++ packages that depend on astra.
6) Remove some old code related to cudatoolkit<8.0.

For astra-toolbox:

1) astra-toolbox uses the conda-provided compilers
2) The compilers are fixed to version 7.3
3) Add boost to host requirements of astra-toolbox

Notes on testing:

- The libastra build has been tested with all versions of cudatoolkit
- The astra-toolbox build has been tested with all provided versions
  of python after building a single cudatoolkit version of libastra.

How to test this branch:

- It should work by just editing
  `python/conda/linux_release/buildenv/build.sh`. Set
  BRANCH=CI-use-conda-c-compiler-toolchain
  URL=https://github.com/ahendriksen/astra-toolbox

  and run release.sh from the `python/conda/linux_release` directory.

1 files changed, 7 insertions, 6 deletions

diff --git a/python/conda/libastra/meta.yaml b/python/conda/libastra/meta.yaml
index 59c3a09..407929b 100644
--- a/python/conda/libastra/meta.yaml
+++ b/python/conda/libastra/meta.yaml
@@ -8,21 +8,22 @@ source:
 
 build:
   number: 0
-  script_env:
-    - CC # [linux]
-    - CXX # [linux]
+  string: cuda_{{ cudatoolkit }} # [linux]
 
 requirements:
   build:
-    - {{compiler('c')}} # [win]
+    - {{ compiler('c') }}    # [win or linux]
+    - {{ compiler('cxx') }}  # [linux]
     - boost # [osx]
     - automake # [osx]
     - autoconf # [osx]
     - libtool # [osx]
+  host:
+    - boost # [osx or linux]
     - cudatoolkit {{ cudatoolkit }} # [linux]
-
   run:
-    - cudatoolkit {{ cudatoolkit }} # [linux]
+    # See: https://github.com/conda-forge/conda-forge.github.io/issues/687#issuecomment-460095230
+    - {{ pin_compatible('cudatoolkit', max_pin='x.x') }} # [linux]
 
 about:
   home: http://www.astra-toolbox.com