https://llvm.org/bugs/show_bug.cgi?id=31016
Bug ID: 31016
Summary: r286884 breaks the build when compiling with an older
clang
Product: libc++
Version: unspecified
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: v...@apple.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
We build with an older version of clang (branched around 3.8) which can't
deduce that a default template argument is a constant expression.
Ideally, we'd like to check in a workaround that doesn't hardcode a compiler
version check. If that's not possible, we'll look into upgrading our bots or
disabling the test. Any advice you have would be appreciated.
Here is the error message:
/Users/buildslave/jenkins/sharedspace/apple-clang-master-RA-stage1-cmake-incremental@2/clang/src/projects/libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp:27:40:
error: non-type template argument is not a constant expression
template <typename T, bool isTrivial =
std::is_trivially_default_constructible_v<T>>
^
/Users/buildslave/jenkins/sharedspace/apple-clang-master-RA-stage1-cmake-incremental@2/clang/src/projects/libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp:53:21:
note: while checking a default template argument used here
test_trivial<int>()();
~~~~~~~~~~~~~~~~^
/Users/buildslave/jenkins/sharedspace/apple-clang-master-RA-stage1-cmake-incremental@2/clang/src/projects/libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp:27:40:
error: non-type template argument is not a constant expression
template <typename T, bool isTrivial =
std::is_trivially_default_constructible_v<T>>
^
/Users/buildslave/jenkins/sharedspace/apple-clang-master-RA-stage1-cmake-incremental@2/clang/src/projects/libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp:27:40:
error: non-type template argument is not a constant expression
/Users/buildslave/jenkins/sharedspace/apple-clang-master-RA-stage1-cmake-incremental@2/clang/src/projects/libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp:27:40:
error: non-type template argument is not a constant expression
/Users/buildslave/jenkins/sharedspace/apple-clang-master-RA-stage1-cmake-incremental@2/clang/src/projects/libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp:27:40:
error: non-type template argument is not a constant expression
5 errors generated.
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