Configure tcmalloc only if used

dart-lang/sdk@7b2cfdb

Author: ntkme

.github/workflows/build.yml

@@ -204,12 +204,14 @@ jobs:
 
       - name: Configure tcmalloc
         run: |
-          apk add --no-cache autoconf automake libtool
-          cd dart-sdk/sdk/third_party/tcmalloc/gperftools
-          ./autogen.sh
-          ./configure --enable-emergency-malloc --enable-frame-pointers --enable-cpu-profiler --disable-heap-checker --disable-debugalloc --enable-sized-delete --disable-libunwind
-          cd ../include
-          find . -type f -print0 | xargs -0 -n 1 -- sh -xc 'cp -f "../gperftools/src/$1" "$1"' --
+          if test -d dart-sdk/sdk/third_party/tcmalloc/gperftools; then
+            apk add --no-cache autoconf automake libtool
+            cd dart-sdk/sdk/third_party/tcmalloc/gperftools
+            ./autogen.sh
+            ./configure --enable-emergency-malloc --enable-frame-pointers --enable-cpu-profiler --disable-heap-checker --disable-debugalloc --enable-sized-delete --disable-libunwind
+            cd ../include
+            find . -type f -print0 | xargs -0 -n 1 -- sh -xc 'cp -f "../gperftools/src/$1" "$1"' --
+          fi
 
       - name: Build
         run: |