Travis: ARM64 build

Azure changes:

- use newer caching task
- add the branch name to cache keys
- install the 64-bit MinGW-w64 ourselves

Homebrew fix

.travis.yml

@@ -1,5 +1,7 @@
 language: go
 
+dist: bionic
+
 # https://docs.travis-ci.com/user/caching/
 cache:
   directories:
@@ -20,10 +22,25 @@ go:
 matrix:
   include:
     - os: linux
+      arch: amd64
       sudo: required
+      env:
+        - NPROC=2
       before_install:
         - export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/lib"
+    - os: linux
+      arch: arm64
+      sudo: required
+      env:
+        - NPROC=6 # Worth trying more than 2 parallel jobs: https://travis-ci.community/t/no-cache-support-on-arm64/5416/8
+        # (also used to get a different cache key than the amd64 one)
+      before_install:
+        - export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/lib"
+        - sudo apt-get -q update
+        - sudo apt-get install -y libpcre3-dev git-lfs
     - os: osx
+      env:
+        - NPROC=2
       before_install:
         - launchctl setenv LIBRARY_PATH /usr/local/lib # for RocksDB
 
@@ -36,7 +53,7 @@ install:
 
 script:
   - set -e # fail fast
-  - make -j2 update # to allow a newer Nim version to be detected
+  - make -j${NPROC} NIMFLAGS="--parallelBuild:${NPROC}" update # to allow a newer Nim version to be detected
-  - make -j2
+  - make -j${NPROC} NIMFLAGS="--parallelBuild:${NPROC}"
-  - make -j2 DISABLE_LFS_SCRIPT=1 test
+  - make -j${NPROC} NIMFLAGS="--parallelBuild:${NPROC}" DISABLE_LFS_SCRIPT=1 test
 

azure-pipelines.yml

@@ -11,30 +11,29 @@ jobs:
         64-bit:
           PLATFORM: x64
     steps:
-      - task: CacheBeta@0
+      - task: CacheBeta@1
         displayName: 'cache Nim binaries'
         inputs:
-          key: NimBinaries | $(Agent.OS) | $(PLATFORM)
+          key: NimBinaries | $(Agent.OS) | $(PLATFORM) | $(Build.SourceBranchName)
           path: NimBinaries
 
-      - task: CacheBeta@0
+      - task: CacheBeta@1
         displayName: 'cache p2pd binaries'
         inputs:
-          key: p2pdCache | $(Agent.OS) | $(PLATFORM)
+          key: p2pdCache | $(Agent.OS) | $(PLATFORM) | $(Build.SourceBranchName)
           path: p2pdCache
 
-      - task: CacheBeta@0
+      - task: CacheBeta@1
         displayName: 'cache LFS JSON fixtures'
         inputs:
           key: jsonTestsCache
           path: jsonTestsCache
 
-      - task: CacheBeta@0
+      - task: CacheBeta@1
         displayName: 'cache MinGW-w64'
         inputs:
-          key: mingwCache
+          key: mingwCache | 8_1_0 | $(PLATFORM)
           path: mingwCache
-        condition: eq(variables['PLATFORM'], 'x86')
 
       - powershell: |
           Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\FileSystem' -Name 'LongPathsEnabled' -Value 1
@@ -42,20 +41,27 @@ jobs:
 
       - bash: |
           set -e
+          echo "Installing MinGW-w64"
           if [[ $PLATFORM == "x86" ]]; then
-            echo "Installing 32-bit MinGW-w64"
+            MINGW_FILE="i686-8.1.0-release-posix-dwarf-rt_v6-rev0.7z"
+            MINGW_URL="https://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/8.1.0/threads-posix/dwarf/${MINGW_FILE}"
+            MINGW_DIR="mingw32"
+          else
+            MINGW_FILE="x86_64-8.1.0-release-posix-seh-rt_v6-rev0.7z"
+            MINGW_URL="https://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/8.1.0/threads-posix/seh/${MINGW_FILE}"
+            MINGW_DIR="mingw64"
+          fi
           mkdir -p mingwCache
           cd mingwCache
-            MINGW_FILE="i686-8.1.0-release-posix-dwarf-rt_v6-rev0.7z"
           if [[ ! -e "$MINGW_FILE" ]]; then
             rm -f *.7z
-              curl -OLsS "https://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/8.1.0/threads-posix/dwarf/${MINGW_FILE}"
+            curl -OLsS "$MINGW_URL"
           fi
           7z x -y -bd "$MINGW_FILE" >/dev/null
-            mv mingw32 /C/
+          mkdir -p /c/custom
+          mv "$MINGW_DIR" /c/custom/
           cd ..
-            export PATH="/C/mingw32/bin:$PATH"
+          export PATH="/c/custom/${MINGW_DIR}/bin:$PATH"
-          fi
           echo "Fetching submodules"
           git config --global core.longpaths true
           export GIT_LFS_SKIP_SMUDGE=1

nim.cfg

@@ -20,5 +20,6 @@
 --threads:on
 --opt:speed
 --excessiveStackTrace:on
--d:metrics # enable metric collection
+# enable metric collection
+-d:metrics
 

scripts/process_lfs.sh

@@ -74,7 +74,7 @@ process_subdir() {
 	fi
 	if [[ "${UPDATE_CACHE}" == "1" ]]; then
 		if [[ "${ON_MACOS}" == "1" ]]; then
-			brew install git-lfs # this takes almost 5 minutes on Travis, so only run it if needed
+			HOMEBREW_NO_AUTO_UPDATE=1 brew install git-lfs # this takes almost 5 minutes on Travis, so only run it if needed
 		fi
 		download_lfs_files "$LFS_DIR"
 		echo "Updating the cache."