Improvements to the conda build (#2742)

conda/cross-linux.cmake

+# this one is important
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_PLATFORM Linux)
+#this one not so much
+set(CMAKE_SYSTEM_VERSION 1)
+
+# specify the cross compiler
+set(CMAKE_C_COMPILER $ENV{CC})
+
+# where is the target environment
+set(CMAKE_FIND_ROOT_PATH $ENV{PREFIX} $ENV{BUILD_PREFIX}/$ENV{HOST}/sysroot)
+
+# search for programs in the build host directories
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+# for libraries and headers in the target directories
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+# god-awful hack because it seems to not run correct tests to determine this:
+set(__CHAR_UNSIGNED___EXITCODE 1)

conda/nnvm/meta.yaml

@@ -8,7 +8,7 @@ source:
   path: ../..
 
 build:
-  number: 1
+  number: 0
   skip: True  # [win]
 
 requirements:

conda/topi/meta.yaml

@@ -8,7 +8,7 @@ source:
   path: ../..
 
 build:
-  number: 1
+  number: 0
 
 requirements:
   host:

conda/tvm-libs/build.sh

 #!/bin/bash
 
+# Fix for OSX build to hide the clang LLVM
+rm -f ${BUILD_PREFIX}/bin/llvm-config
+rm -rf ${BUILD_PREFIX}/lib/cmake
+
 set -e
 
 if [ -z "$PREFIX" ]; then
@@ -9,13 +13,29 @@ fi
 if [ -z "$cuda" ] || [ "$cuda" == "False" ]; then
     CUDA_OPT=""
 else
-    CUDA_OPT="-DUSE_CUDA=ON"
+    CUDA_OPT="-DUSE_CUDA=ON -DUSE_CUBLAS=ON"
+fi
+
+if [ "$target_platform" == "osx-64" ]; then
+    # macOS 64 bits
+    METAL_OPT=""  # Conda can only target 10.9 for now
+    TOOLCHAIN_OPT=""
+else
+    METAL_OPT=""
+    if [ "$target_platform" == "linux-64" ]; then
+        # Linux 64 bits
+        TOOLCHAIN_OPT="-DCMAKE_TOOLCHAIN_FILE=${RECIPE_DIR}/../cross-linux.cmake"
+    else
+        # Windows (or 32 bits, which we don't support)
+        METAL_OPT=""
+        TOOLCHAIN_OPT=""
+    fi
 fi
 
 rm -rf build || true
 mkdir -p build
 cd build
-cmake $CUDA_OPT -DUSE_LLVM=ON -DINSTALL_DEV=ON -DCMAKE_INSTALL_PREFIX="$PREFIX" ..
-make -j4 VERBOSE=1
+cmake $METAL_OPT $CUDA_OPT -DUSE_LLVM=ON -DINSTALL_DEV=ON -DCMAKE_INSTALL_PREFIX="$PREFIX" $TOOLCHAIN_OPT ..
+make -j${CPU_COUNT} VERBOSE=1
 make install
 cd ..

conda/tvm-libs/meta.yaml

@@ -8,21 +8,17 @@ source:
   path: ../..
 
 build:
-  number: 1
+  number: 0
   string: cuda{{ cuda_version }}_{{ PKG_BUILDNUM }}  # [cuda]
 
 requirements:
   build:
-    - {{ compiler('cxx') }}  # [linux]
-    - llvmdev ==6.0.0  # [osx]
-  host:
     # The OS X build will require some manual setup or it will break
-    # See https://conda.io/docs/user-guide/tasks/build-packages/compiler-tools.html#macos-sdk
-    # It is also ass-backward because of llvm brokeness when mixed with the
-    # conda OS X compiler
-    - {{ compiler('cxx') }}  # [osx]
+    # See https://docs.conda.io/projects/conda-build/en/latest/source/resources/compiler-tools.html#macos-sdk
+    - {{ compiler('cxx') }}
+  host:
     - cmake
-    - llvmdev ==6.0.0  # [linux]
+    - llvmdev ==6.0.0
     - zlib  # [linux]
   run:
     - {{ pin_compatible('cudatoolkit', lower_bound=cuda_version, max_pin='x.x') }}  # [cuda]

conda/tvm/meta.yaml

@@ -8,7 +8,7 @@ source:
   path: ../..
 
 build:
-  number: 1
+  number: 0
 
 requirements:
   build: