[WIP] POT build without installing cython first (#293)

* test build with no dep

* cleaning up stuff

* build wheels

4 files changed, 15 insertions, 18 deletions

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 379394a..f13aaa0 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -38,10 +38,11 @@ jobs:
             name: Get Python running
             command: |
               python -m pip install --user --upgrade --progress-bar off pip
+              python -m pip install --user -e .
               python -m pip install --user --upgrade --progress-bar off -r requirements.txt
               python -m pip install --user --upgrade --progress-bar off -r docs/requirements.txt
               python -m pip install --user --upgrade --progress-bar off ipython "https://api.github.com/repos/sphinx-gallery/sphinx-gallery/zipball/master" memory_profiler
-              python -m pip install --user -e .
+              
 
         - save_cache:
             key: pip-cache
diff --git a/.github/workflows/build_tests.yml b/.github/workflows/build_tests.yml
index fd0ade6..91631b4 100644
--- a/.github/workflows/build_tests.yml
+++ b/.github/workflows/build_tests.yml
@@ -30,14 +30,14 @@ jobs:
       uses: actions/setup-python@v1
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Install POT
+      run: |
+        pip install -e .
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install -r requirements.txt
         pip install pytest "pytest-cov<2.6" codecov
-    - name: Install POT
-      run: |
-        pip install -e .
     - name: Run tests
       run: |
         python -m pytest --durations=20 -v test/ ot/ --doctest-modules --ignore ot/gpu/ --cov=ot --color=yes
@@ -88,7 +88,6 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -r .github/requirements_strict.txt
         pip install pytest
     - name: Install POT
       run: |
@@ -112,14 +111,14 @@ jobs:
        uses: actions/setup-python@v1
        with:
          python-version: ${{ matrix.python-version }}
+     - name: Install POT
+       run: |
+         pip install -e .
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements.txt
          pip install pytest "pytest-cov<2.6"
-     - name: Install POT
-       run: |
-         pip install -e .
      - name: Run tests
        run: |
          python -m pytest --durations=20  -v test/ ot/ --doctest-modules --ignore ot/gpu/ --cov=ot --color=yes
@@ -139,15 +138,15 @@ jobs:
       uses: actions/setup-python@v1
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Install POT
+      run: |
+        python -m pip install -e .
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         python -m pip install -r .github/requirements_test_windows.txt
         python -m pip install torch==1.8.1+cpu -f https://download.pytorch.org/whl/torch_stable.html
         python -m pip install pytest "pytest-cov<2.6"
-    - name: Install POT
-      run: |
-        python -m pip install -e .
     - name: Run tests
       run: |
         python -m pytest --durations=20  -v test/ ot/ --doctest-modules --ignore ot/gpu/ --cov=ot --color=yes
diff --git a/README.md b/README.md
index ffad0bd..f0e5227 100644
--- a/README.md
+++ b/README.md
@@ -79,16 +79,10 @@ The library has been tested on Linux, MacOSX and Windows. It requires a C++ comp
 
 - Numpy (>=1.16)
 - Scipy (>=1.0)
-- Cython (>=0.23) (build only, not necessary when installing wheels from pip or conda)
+- Cython (>=0.23) (build only, not necessary when installing from pip or conda)
 
 #### Pip installation
 
-Note that due to a limitation of pip, `cython` and `numpy` need to be installed
-prior to installing POT. This can be done easily with
-
-```console
-pip install numpy cython
-```
 
 You can install the toolbox through PyPI with:
 
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..3f8ae8b
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel", "numpy>=1.16", "cython>=0.23"]
+build-backend = "setuptools.build_meta"
\ No newline at end of file