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cxx_alignof will be a separate feature known to CMake, because
both can be implemented with separate backward compatibility
versions.
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Expect cxx_variadic_templates to implement N2555.
N2555 is essentially a bugfix and predates most compiler releases which
aimed to experimentally support variadic templates.
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This can be used to set the compiler features required by particular
targets. An error is issued at CMake time if the compiler does not
support the required feature. If a language dialect flag is required
by the features used, that will be added automatically.
Base the target_compile_features command on cmTargetPropCommandBase. This
gives us 'free' handling of IMPORTED, ALIAS, INTERFACE, non-compilable
and missing targets.
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This is needed for the target_compile_features command, which
may fail at configure time if an invalid feature is specified.
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Extend the interface of the target_compile_features command with
PUBLIC and INTERFACE keywords. Populate the INTERFACE_COMPILER_FEATURES
target property if they are set. Consume the INTERFACE_COMPILER_FEATURES
target property from linked dependent targets to determine the final
required compiler features and the compile flag, if needed.
Use the same pattern of origin-debugging which is used for other
build properties.
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Delay validation of the content as a feature if it contains a
generator expression. It will be checked again at generate-time
after evaluation.
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Record the availability of this feature for GNU 4.8 on (UNIX AND
NOT APPLE) only. In the future, availability can be recorded for
earlier GNU, for other platforms and for other compilers. Initially
the affected configurations are as restricted as possible to allow
for easy testing while extending the features vector in only one
dimension.
The error message when using the set_property API directly is not
very good, but follow up commits will provide origin debugging of
the property and a target_compile_features command which will
provide a configure-time backtrace when possible.
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Use the contents of it to upgrade the CXX_STANDARD target property,
if appropriate. This will have the effect of adding the -std=c++11
compile flag or other language specification on GNU when that is
needed for the feature.
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Add a feature test using the compiler macros and the preprocessor to
determine available features.
Add a CMAKE_CXX_COMPILE_FEATURES variable which contains all features
known to the loaded compiler, and a CMAKE_CXX_KNOWN_FEATURES variable
containing all features known to CMake. Add language standard specific
variables for internal use to determine the standard-specific compile
flags to use.
This will be extended to other languages in the future. Follow-up
commits will add features which will be recorded by the feature test.
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These are used to determine whether to add -std=c++11, -std=gnu++11
etc flags on the compile line.
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These are compiler-specific, compiler version specific, extension specific
and standard version specific.
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Correctly identify AppleClang.
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The Clang-CXX module is going to get version-specific checks, and
the version system for AppleClang is not the same as Clang.
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a4e6bf8e cmTarget: Make GetSourceFiles string overload private.
92e2fbe1 cmGeneratorTarget: Trace cmSourceFile objects instead of strings.
c5b26f3b cmTarget: Cache the cmSourceFiles in GetSourceFiles.
eb163f37 cmTarget: Extract a ProcessSourceItemCMP0049 method.
19b7c22d Ninja: Query custom commands once per target, not once per file.
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Consumers should use the cmSourceFile overload, which is now
always the case.
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This reverses the decision in commit d38423ec (cmTarget: Add a
method to obtain list of filenames for sources., 2014-03-17). The
cmSourceFile based API is preferred because that avoids creation of
many cmSourceFileLocation objects for matching strings, and the
result is cached by cmTarget.
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Avoid calling GetSourceFiles with the same result container multiple
times when tracing target dependencies. The result from the previous
configuration is cached and used later otherwise.
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Avoid calling AddSource for each src filename. That involves
checking each entry for uniqueness and creating a separate
generator expression for each one.
Instead, add a single entry for the list of sources. The source
files are passed through a uniqueness filter at generate-time, so
duplicates don't matter so much.
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Computing the source files is now more expensive, so the Ninja
generator became very slow with a large number of files.
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be53734d CompileFlags: Add -AA +hpxstd98 on HP-UX 11.11 with aCC
f4b9c6bb CompileFlags: Test for C++ features after selecting flags
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These flags are needed to enable support for C++98. Also teach the
'bootstrap' script to add them if necessary.
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