[netcore] Improve netcore/build.sh script (#14835)

* Improve netcore/build.sh

* bump corefx tests version

* ignore StringTests failures

* Ignore more tests for xtestall

* Implement Environment.TickCount64

* cleanup

* Add two debug-* rules

1 files changed, 38 insertions, 7 deletions

diff --git a/netcore/build.sh b/netcore/build.sh
index 6b3ea801d5f..ac7a651c74b 100755
--- a/netcore/build.sh
+++ b/netcore/build.sh
@@ -1,5 +1,12 @@
 #!/usr/bin/env bash
 
+# Stop script if unbound variable found (use ${var:-} if intentional)
+set -u
+
+# Stop script if command returns non-zero exit code.
+# Prevents hidden errors caused by missing error code propagation.
+set -e
+
 usage()
 {
   echo "Common settings:"
@@ -10,6 +17,9 @@ usage()
   echo "Actions:"
   echo "  --pack                     Package build outputs into NuGet packages"
   echo "  --test                     Run all unit tests in the solution (short: -t)"
+  echo "  --rebuild                  Run ../.autogen.sh"
+  echo "  --skipnative               Do not build runtime"
+  echo "  --skipmscorlib             Do not build System.Private.CoreLib"
   echo ""
 
   echo "Command line arguments starting with '/p:' are passed through to MSBuild."
@@ -19,6 +29,10 @@ usage()
 pack=false
 configuration='Debug'
 properties=''
+force_rebuild=false
+test=false
+skipmscorlib=false
+skipnative=false
 
 while [[ $# > 0 ]]; do
   opt="$(echo "${1/#--/-}" | awk '{print tolower($0)}')"
@@ -38,6 +52,15 @@ while [[ $# > 0 ]]; do
     -test|-t)
       test=true
       ;;
+    -rebuild)
+      force_rebuild=true
+      ;;
+    -skipmscorlib)
+      skipmscorlib=true
+      ;;
+    -skipnative)
+      skipnative=true
+      ;;
     -p:*|/p:*)
       properties="$properties $1"
       ;;
@@ -61,24 +84,32 @@ while [[ $# > 0 ]]; do
 done
 
 
-cd ..
-./autogen.sh --with-core=only
-cd netcore
+# run .././autogen.sh only once or if "--rebuild" argument is provided
+if [[ "$force_rebuild" == "true" || ! -f .configured ]]; then
+  cd ..
+  ./autogen.sh --with-core=only
+  cd netcore
+  touch .configured
+fi
 
 CPU_COUNT=$(getconf _NPROCESSORS_ONLN || echo 4)
 
 # build mono runtime
-make runtime -j$(CPU_COUNT)
+if [ "$skipnative" = "false" ]; then
+  make runtime -j$CPU_COUNT
+fi
 
 # build System.Private.CoreLib (../mcs/class/System.Private.CoreLib)
-make bcl CORLIB_BUILD_FLAGS="$properties"
+if [ "$skipmscorlib" = "false" ]; then
+  make bcl CORLIB_BUILD_FLAGS="$properties"
+fi
 
 # create a nupkg with runtime and System.Private.CoreLib
 if [ "$pack" = "true" ]; then
-    make nupkg
+  make nupkg
 fi
 
 # run all xunit tests
 if [ "$test" = "true" ]; then
-    make xtestall
+  make xtestall
 fi
\ No newline at end of file