Changes in cxx1y-default-initializer.cpp

a45f713c - add option to instantiate templates already in the PCH

Sun, 19 Apr 2020 15:49:47 +0000

add option to instantiate templates already in the PCHAdd -fpch-instantiate-templates which makes template instantiations beperformed already in the PCH instead of it being done in every singlefile that uses the PCH (but every single file will still do it as wellin order to handle its own instantiations). I can see 20-30% buildtime saved with the few tests I've tried.The change may reorder compiler output and also generated code, butshould be generally safe and produce functionally identical code.There are some rare cases that do not compile with it,such as test/PCH/pch-instantiate-templates-forward-decl.cpp. Iftemplate instantiation bailed out instead of reporting the error,these instantiations could even be postponed, which would make themwork.Enable this by default for clang-cl. MSVC creates PCHs by compilingthem using an empty .cpp file, which means templates are instantiatedwhile building the PCH and so the .h needs to be self-contained,making test/PCH/pch-instantiate-templates-forward-decl.cpp to failwith MSVC anyway. So the option being enabled for clang-cl matches this.Differential Revision: https://reviews.llvm.org/D69585 List of files: /llvm-project-15.0.7/clang/test/PCH/cxx1y-default-initializer.cpp

5030928d - [c++20] Implement semantic restrictions for C++20 designated

Fri, 30 Aug 2019 22:52:55 +0000

[c++20] Implement semantic restrictions for C++20 designatedinitializers.This has some interesting interactions with our existing extensions tosupport C99 designated initializers as an extension in C++. Those areresolved as follows: * We continue to permit the full breadth of C99 designated initializers in C++, with the exception that we disallow a partial overwrite of an initializer with a non-trivially-destructible type. (Full overwrite is OK, because we won't run the first initializer at all.) * The C99 extensions are disallowed in SFINAE contexts and during overload resolution, where they could change the meaning of valid programs. * C++20 disallows reordering of initializers. We only check for that for the simple cases that the C++20 rules permit (designators of the form '.field_name =' and continue to allow reordering in other cases). It would be nice to improve this behavior in future. * All C99 designated initializer extensions produce a warning by default in C++20 mode. People are going to learn the C++ rules based on what Clang diagnoses, so it's important we diagnose these properly by default. * In C++ <= 17, we apply the C++20 rules rather than the C99 rules, and so still diagnose C99 extensions as described above. We continue to accept designated C++20-compatible initializers in C++ <= 17 silently by default (but naturally still reject under -pedantic-errors).This is not a complete implementation of P0329R4. In particular, thatpaper introduces new non-C99-compatible syntax { .field { init } }, andwe do not support that yet.This is based on a previous patch by Don Hinton, though I've madesubstantial changes when addressing the above interactions.Differential Revision: https://reviews.llvm.org/D59754llvm-svn: 370544 List of files: /llvm-project-15.0.7/clang/test/PCH/cxx1y-default-initializer.cpp

4b054b26 - PR29097: add an update record when we instantiate the default member

Wed, 24 Aug 2016 21:25:37 +0000

PR29097: add an update record when we instantiate the default memberinitializer of an imported field.llvm-svn: 279667 List of files: /llvm-project-15.0.7/clang/test/PCH/cxx1y-default-initializer.cpp

52a980a9 - PR24597: Fix in-place evaluation of call expressions to provide a proper "this"

Fri, 28 Aug 2015 02:43:42 +0000

PR24597: Fix in-place evaluation of call expressions to provide a proper "this"pointer to an RVO construction of a returned object.llvm-svn: 246263 List of files: /llvm-project-15.0.7/clang/test/PCH/cxx1y-default-initializer.cpp

51fe3a48 - Add another test I forgot to svn add.

Sat, 20 Apr 2013 22:23:29 +0000

Add another test I forgot to svn add.llvm-svn: 179959 List of files: /llvm-project-15.0.7/clang/test/PCH/cxx1y-default-initializer.cpp