Merge pull request #623 from Anton-Latukha/upd-Travis-04

CI: Travis: enable testing sdist and strict build as high as possible

.travis.yml

@@ -16,14 +16,6 @@ git:
               # when a new commit has been pushed to a branch before the CI
               # platform started cloning the intended commit."
 
-# NOTE: {os} x {jobs} - {exclude} = {build matrix}
-os:
-  - linux
-  - osx
-
-#  2020-05-26: NOTE: Currently newest Travis dist Ubuntu 18.04 bionic
-dist: bionic
-
 # #  2020-05-26: NOTE: Currently newest macOS image
 # osx_image: xcode11.4  # NOTE: Official Nix installer fails spectacularly on it.
 
@@ -70,7 +62,7 @@ env:
     # NOTE: Build a source distribution tarball instead of using the source files directly. The effect is that the package is built as if it were published on hackage. This can be used as a test for the source distribution, assuming the build fails when packaging mistakes are in the cabal file.
     - buildFromSdist=false
     # NOTE: Build the package in a strict way to uncover potential problems. This includes buildFromSdist and failOnAllWarnings.
-    #  2020-05-26: NOTE: Currently HNix not able to pass Strict
+    #  2020-05-26: NOTE: Currently HNix not able to pass Strict on GHC 8.8.3 due to MonalFail migration
     - buildStrictly=false
     # NOTE: Disable core optimizations, significantly speeds up the build
     - disableOptimization=true
@@ -88,16 +80,36 @@ env:
     - ghcjsTmpLogFile='/tmp/ghcjsTmpLogFile.log'
     # NOTE: Length of the GHCJS log tail (<40000)
     - ghcjsLogTailLength=10000
-  # NOTE: {os} x {jobs} - {exclude} = {build matrix}
-  jobs:
-    - GHCVERSION=ghc844
-    - GHCVERSION=ghc865
-    - GHCVERSION=ghc883
-    - GHCVERSION=ghc8101
-    - GHCVERSION=ghcjs
 
-#  2020-05-25: NOTE: We still yet to build this in `master`
+#  2020-05-26: NOTE: Currently newest Travis dist Ubuntu 18.04 bionic
+# NOTE: {os} x {jobs} + {jobs:include} - {jobs:exclude} = {build matrix}
 jobs:
+  include:
+    - name: GHC 8.4.4, Linux
+      env: GHCVERSION=ghc844
+      os: linux
+      dist: bionic
+    - name: GHC 8.6.5, Linux, Strict
+      env:
+        - GHCVERSION=ghc865
+        - buildStrictly=true
+      os: linux
+      dist: bionic
+    - name: GHC 8.8.3, macOS, SDist
+      env:
+        - GHCVERSION=ghc883
+        - buildFromSdist=true
+      os: osx
+    - name: GHC 8.10.1 Linux
+      env:
+        - GHCVERSION=ghc8101
+      os: linux
+      dist: bionic
+    - name: GHCJS, Linux
+      env:
+        - GHCVERSION=ghcjs
+      os: linux
+      dist: bionic
   allow_failures:
     - env: GHCVERSION=ghcjs
     - env: GHCVERSION=ghc8101