Stephan Bergmann
a1f71ce7aa
...as found failing at <https://gerrit.libreoffice.org/c/core/+/195869/1> "tdf#165233 Replaced lambda explicit capture with capture-default". The lambda class in f3 in compilerplugins/clang/test/unusedcapturedefault.cxx is > CXXRecordDecl 0x42964240 </home/sberg/lo/core/compilerplugins/clang/test/unusedcapturedefault.cxx:25:12> col:12 implicit class definition > |-DefinitionData lambda empty standard_layout trivially_copyable literal can_const_default_init > | |-DefaultConstructor defaulted_is_constexpr > | |-CopyConstructor simple trivial has_const_param needs_implicit implicit_has_const_param > | |-MoveConstructor exists simple trivial needs_implicit > | |-CopyAssignment trivial has_const_param needs_implicit implicit_has_const_param > | |-MoveAssignment > | `-Destructor simple irrelevant trivial constexpr needs_implicit > `-CXXMethodDecl 0x42964380 <col:16, col:30> col:12 operator() 'auto () const' inline > `-CompoundStmt 0x429644f0 <col:18, col:30> > `-ReturnStmt 0x429644e0 <col:20, col:27> > `-DeclRefExpr 0x429644c0 <col:27> 'const T' lvalue ParmVar 0x42963ec8 'x' 'T' refers_to_enclosing_variable_or_capture without any FieldDecls. Change-Id: I57bbb8ae3e052d3e00644228b83612e06ab37a0b Reviewed-on: https://gerrit.libreoffice.org/c/core/+/195879 Reviewed-by: Stephan Bergmann <stephan.bergmann@collabora.com> Tested-by: Jenkins
Compiler plugins
Overview
This directory contains code for compiler plugins. These are used to perform additional actions during compilation (such as additional warnings) and also to perform mass code refactoring.
Currently only the Clang compiler is supported http://wiki.documentfoundation.org/Development/Clang.
Usage
Compiler plugins are enabled automatically by --enable-dbgutil if Clang headers
are found or explicitly using --enable-compiler-plugins.
Functionality
There are two kinds of plugin actions:
- compile checks - these are run during normal compilation
- rewriters - these must be run manually and modify source files
Each source has a comment saying whether it's compile check or a rewriter and description of functionality.
Compile Checks
Used during normal compilation to perform additional checks. All warnings and errors are marked '[loplugin]' in the message.
Rewriters
Rewriters analyse and possibly modify given source files.
Usage: make COMPILER_PLUGIN_TOOL=<rewriter_name>
Additional optional make arguments:
-
it is possible to also pass
FORCE_COMPILE=allto make to trigger rebuild of all source files, even those that are up to date. FORCE_COMPILE takes a list of gbuild targets specifying where to run the rewriter ('all' means everything, '-' prepended means to not enable, '/' appended means everything in the directory; there is no ordering, more specific overrides more general, and disabling takes precedence). Example: FORCE_COMPILE="all -sw/ -Library_sc" -
UPDATE_FILES=<scope>- limits which modified files will be actually written back with the changesmainfile- only the main.cxxfile will be modified (default)all- all source files involved will be modified (possibly even header files from other LO modules), 3rd party header files are however never modified<module>- only files in the given LO module (toplevel directory) will be modified (including headers)
Modifications will be written directly to the source files.
Some rewriter plugins are dual-mode and can also be used in a non-rewriting mode
in which they emit warnings for problematic code that they would otherwise
automatically rewrite. When any rewriter is enabled explicitly via make COMPILER_PLUGIN_TOOL=<rewriter_name> it works in rewriting mode (and all other
plugins are disabled), but when no rewriter is explicitly enabled (i.e., just
make), all dual-mode rewriters are enabled in non-rewriting mode (along with
all non-rewriter plugins; and all non--dual-mode plugins are disabled). The
typical process to use such a dual-mode rewriter X in rewriting mode is
make COMPILER_PLUGIN_WARNINGS_ONLY=X \
&& make COMPILER_PLUGIN_TOOL=X FORCE_COMPILE=all UPDATE_FILES=all
which first generates a full build without failing due to warnings from plugin
X in non-rewriting mode (in case of --enable-werror) and then repeats the build
in rewriting mode (during which no object files are generate).