Introduce a limit on the depth of the template instantiation backtrace
we will print with each error that occurs during template
instantiation. When the backtrace is longer than that, we will print
N/2 of the innermost backtrace entries and N/2 of the outermost
backtrace entries, then skip the middle entries with a note such as:
note: suppressed 2 template instantiation contexts; use
-ftemplate-backtrace-limit=N to change the number of template
instantiation entries shown
This should eliminate some excessively long backtraces that aren't
providing any value.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@101882 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaTemplate/instantiation-depth.cpp b/test/SemaTemplate/instantiation-depth.cpp
index f48ede9..20a5c24 100644
--- a/test/SemaTemplate/instantiation-depth.cpp
+++ b/test/SemaTemplate/instantiation-depth.cpp
@@ -1,8 +1,10 @@
-// RUN: %clang_cc1 -fsyntax-only -ftemplate-depth 5 -verify %s
+// RUN: %clang_cc1 -fsyntax-only -verify -ftemplate-depth 5 -ftemplate-backtrace-limit 4 %s
-template<typename T> struct X : X<T*> { }; // expected-error{{recursive template instantiation exceeded maximum depth of 5}} \
-// expected-note{{use -ftemplate-depth-N to increase recursive template instantiation depth}} \
-// expected-note 5 {{instantiation of template class}}
+template<typename T> struct X : X<T*> { }; \
+// expected-error{{recursive template instantiation exceeded maximum depth of 5}} \
+// expected-note 3 {{instantiation of template class}} \
+// expected-note {{suppressed 2 template instantiation contexts}} \
+// expected-note {{use -ftemplate-depth-N to increase recursive template instantiation depth}}
void test() {
(void)sizeof(X<int>); // expected-note {{instantiation of template class}}