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XL: Add comment clarifying why we pretend it has full C++11/14 support

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Since commit b0f46c48f6 (CompileFeatures: Now able to presume full
language level support, 2019-03-06, v3.15.0-rc1~265^2~1) we pretend that
the XL compiler has full C++11 and C++14 support so that projects
specifying granular features will at least get the corresponding
compiler mode.  This is a work around for our lack of a full feature
check table for this compiler that works in common cases.  Add a comment
explaining this.

Issue: #20521
This commit is contained in:
Brad King
2020-03-31 10:33:01 -04:00
parent 4aaa9ea96c
commit 46d9006efa
1 changed files with 6 additions and 0 deletions
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6
Modules/Compiler/XL-CXX.cmake
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@@ -17,7 +17,13 @@ if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-qlanglvl=extended0x")
set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-qlanglvl=extended0x")
set(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT ON)
# XL does not really have full C++11 or C++14 support, but since we do not
# have a granular XL-CXX-FeatureTests table for it just pretend it does.
# This way projects that specify granular features will at least get a
# compiler mode for the corresponding standard.
set(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT ON)
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.1.0 AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-qlanglvl=extended1y")
set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-qlanglvl=extended1y")