Auto merge of #12812 - Alexendoo:driver-integration, r=flip1995

Manually set library paths in .github/driver.sh

Fixes https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/Windows.20CI.20failing

Rustup 1.27.1 no longer adds `[SYSROOT]/bin` to `PATH` by default - rust-lang/rustup#3825. This is fine for the packaged binaries since windows loads `dll`s from the folder the executable is in, but our built one is in a different folder

There's an environment variable to get the old behaviour back, but as it's deprecated and not much code I think returning to setting it manually is fine

changelog: none

.github/driver.sh

@@ -2,15 +2,18 @@
 
 set -ex
 
+sysroot="$(rustc --print sysroot)"
+case $OS in
+    Linux) export LD_LIBRARY_PATH="$sysroot/lib" ;;
+    macOS) export DYLD_FALLBACK_LIBRARY_PATH="$sysroot/lib" ;;
+    Windows) export PATH="$(cygpath "$sysroot")/bin:$PATH" ;;
+    *) exit 1
+esac
+
 # Check sysroot handling
-sysroot=$(./target/debug/clippy-driver --print sysroot)
-test "$sysroot" = "$(rustc --print sysroot)"
-
-if [[ ${OS} == "Windows" ]]; then
-	desired_sysroot=C:/tmp
-else
-	desired_sysroot=/tmp
-fi
+test "$(./target/debug/clippy-driver --print sysroot)" = "$sysroot"
+
+desired_sysroot="target/sysroot"
 # Set --sysroot in command line
 sysroot=$(./target/debug/clippy-driver --sysroot $desired_sysroot --print sysroot)
 test "$sysroot" = $desired_sysroot

.github/workflows/clippy.yml

@@ -69,6 +69,6 @@ jobs:
       working-directory: clippy_dev
 
     - name: Test clippy-driver
-      run: |
-        TOOLCHAIN=$(rustup show active-toolchain | cut -f1 -d' ')
-        rustup run $TOOLCHAIN bash .github/driver.sh
+      run: .github/driver.sh
+      env:
+        OS: ${{ runner.os }}

.github/workflows/clippy_bors.yml

@@ -116,9 +116,7 @@ jobs:
       working-directory: clippy_dev
 
     - name: Test clippy-driver
-      run: |
-        TOOLCHAIN=$(rustup show active-toolchain | cut -f1 -d' ')
-        rustup run $TOOLCHAIN bash .github/driver.sh
+      run: .github/driver.sh
       env:
         OS: ${{ runner.os }}