Use a local Go 1.18 installation to check for minimum version support.

.evergreen/config.yml

@@ -1362,19 +1362,6 @@ tasks:
         vars:
           MONGO_GO_DRIVER_COMPRESSOR: "snappy"
 
-  # Build with the oldest supported version of Go.
-  - name: go1.18-build
-    tags: ["compile-check"]
-    commands:
-      - command: subprocess.exec
-        params:
-          binary: bash
-          env:
-            GOROOT: /opt/golang/go1.18
-          add_to_path: [/opt/golang/go1.18/bin]
-          args: [*task-runner, build-compile-check]
-
-  # Build with the same Go version that we're using for tests.
   - name: build
     tags: ["compile-check"]
     commands:

Taskfile.yml

@@ -18,14 +18,23 @@ tasks:
   check-license: bash etc/check_license.sh
 
   build:
-    deps: [cross-compile, build-tests, build-compile-check, install-libmongocrypt]
+    deps: [install-libmongocrypt]
     cmds:
       - go build ./...
       - go build ${BUILD_TAGS} ./...
+      - task: cross-compile
+      - task: build-tests
+      - task: build-compile-check
 
   build-tests: go test -short ${BUILD_TAGS} -run ^$$ ./...
 
-  build-compile-check: bash etc/compile_check.sh
+  # Build the compilecheck submodule, both with the system version of Go and
+  # with the minimum supported version of Go (Go 1.18).
+  build-compile-check:
+    deps: [install-go118]
+    cmds:
+      - bash etc/compile_check.sh
+      - PATH=$(go1.18 env GOROOT)/bin:$PATH GOROOT=$(go1.18 env GOROOT) bash etc/compile_check.sh
 
   build-aws-ecs-test: go build ${BUILD_TAGS} ./internal/cmd/testaws/main.go
 
@@ -210,3 +219,9 @@ tasks:
     internal: true
     cmds:
       - go install github.com/walle/lll/...@latest
+
+  install-go118:
+    internal: true
+    cmds:
+      - go install golang.org/dl/go1.18@latest
+      - go1.18 download

etc/compile_check.sh

@@ -5,7 +5,6 @@ set -x # show all commands being run
 GC=go
 COMPILE_CHECK_DIR="internal/cmd/compilecheck"
 # shellcheck disable=SC2034
-DEV_MIN_VERSION=1.19
 
 # version will flatten a version string of upto 4 components for inequality
 # comparison.