[preamble] Also record the "skipping" state of the preprocessor

When a preamble ends in a conditional preprocessor block that is being
skipped, the preprocessor needs to continue skipping that block when
the preamble is used.

This fixes PR34570.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@317308 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/test/Index/preamble-conditionals-skipping.cpp b/test/Index/preamble-conditionals-skipping.cpp
new file mode 100644
index 0000000000..fa5764cd5d
--- /dev/null
+++ b/test/Index/preamble-conditionals-skipping.cpp
@@ -0,0 +1,16 @@
+// RUN: env CINDEXTEST_EDITING=1 c-index-test -test-load-source-reparse 5 \
+// RUN:                                       local -std=c++14 %s 2>&1 \
+// RUN: | FileCheck %s --implicit-check-not "error:"
+
+#ifdef MYCPLUSPLUS
+extern "C" {
+#endif
+
+#ifdef MYCPLUSPLUS
+}
+#endif
+
+int main()
+{
+    return 0;
+}