BLD: Specify F77 compiler explicitly

Numpy 1.22 seems to require an explicit setting of the F77 compiler.

Also add Python 3.10 to the build tests.

Author: greglucas

.github/workflows/build-wheels.yml

@@ -15,6 +15,7 @@ jobs:
         os: [windows-latest, ubuntu-latest, macos-latest]
     env:
       FC: gfortran-9
+      F77: gfortran-9
       F90: gfortran-9
       CC: gcc-9
     defaults:
@@ -31,6 +32,7 @@ jobs:
           echo "C:\msys64\mingw64\bin" >> $GITHUB_PATH
           echo "C:\msys64\usr\bin" >> $GITHUB_PATH
           echo "FC=gfortran" >> $GITHUB_ENV
+          echo "F77=gfortran" >> $GITHUB_ENV
           echo "F90=gfortran" >> $GITHUB_ENV
           echo "CC=gcc" >> $GITHUB_ENV
 
@@ -51,7 +53,7 @@ jobs:
         run: |
           python -m cibuildwheel --output-dir wheelhouse
         env:
-          CIBW_BUILD: "cp37-* cp38-* cp39-*"
+          CIBW_BUILD: "cp37-* cp38-* cp39-* cp310-*"
 
       - uses: actions/upload-artifact@v2
         with:

.github/workflows/ci.yml

@@ -17,9 +17,10 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
-        python-version: [3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9, 3.10]
     env:
       FC: gfortran-9
+      F77: gfortran-9
       F90: gfortran-9
       CC: gcc-9
     defaults:
@@ -36,6 +37,7 @@ jobs:
         echo "C:\msys64\mingw64\bin" >> $GITHUB_PATH
         echo "C:\msys64\usr\bin" >> $GITHUB_PATH
         echo "FC=gfortran" >> $GITHUB_ENV
+        echo "F77=gfortran" >> $GITHUB_ENV
         echo "F90=gfortran" >> $GITHUB_ENV
         echo "CC=gcc" >> $GITHUB_ENV
 

.github/workflows/docs-publish.yml

@@ -10,6 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       FC: gfortran-9
+      F77: gfortran-9
       F90: gfortran-9
       CC: gcc-9
     steps:

.github/workflows/docs-test.yml

@@ -7,6 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       FC: gfortran-9
+      F77: gfortran-9
       F90: gfortran-9
       CC: gcc-9
     steps: