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CompileFeatures: document why lambda_init_captures requires GCC 4.9

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This commit is contained in:
Robert Maynard 2019-06-14 16:50:52 -04:00
parent d229a095a2
commit 63bf207cd6
1 changed files with 2 additions and 2 deletions
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4
Modules/Compiler/GNU-CXX-FeatureTests.cmake
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@ -18,18 +18,18 @@ set(_cmake_feature_test_cxx_attribute_deprecated "${GNU49_CXX14}")
set(_cmake_feature_test_cxx_decltype_auto "${GNU49_CXX14}")
set(_cmake_feature_test_cxx_digit_separators "${GNU49_CXX14}")
set(_cmake_feature_test_cxx_generic_lambdas "${GNU49_CXX14}")
set(_cmake_feature_test_cxx_lambda_init_captures "${GNU49_CXX14}")
# GNU 4.3 supports binary literals as an extension, but may warn about
# use of extensions prior to GNU 4.9
# http://stackoverflow.com/questions/16334024/difference-between-gcc-binary-literals-and-c14-ones
set(_cmake_feature_test_cxx_binary_literals "${GNU49_CXX14}")
# The feature below is documented as available in GNU 4.8 (by implementing an
# The features below are documented as available in GNU 4.8 (by implementing an
# earlier draft of the standard paper), but that version of the compiler
# does not set __cplusplus to a value greater than 201103L until GNU 4.9:
# http://gcc.gnu.org/onlinedocs/gcc-4.8.2/cpp/Standard-Predefined-Macros.html#Standard-Predefined-Macros
# http://gcc.gnu.org/onlinedocs/gcc-4.9.0/cpp/Standard-Predefined-Macros.html#Standard-Predefined-Macros
# So, CMake only reports availability for it with GNU 4.9 or later.
set(_cmake_feature_test_cxx_return_type_deduction "${GNU49_CXX14}")
set(_cmake_feature_test_cxx_lambda_init_captures "${GNU49_CXX14}")
# Introduced in GCC 4.8.1
set(GNU481_CXX11 "((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 40801) && __cplusplus >= 201103L")