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Android: Do not pass non-existent Clang -std flags

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Android NDK r16b comes with

  Android clang version 5.0.300080  (based on LLVM 5.0.300080)

Although it claims version 5, it does not support the `-std=c++17`
or `-std=c++2a` flags that upstream Clang does.

Android NDK r17-beta1 comes with

  Android (4639204 based on r316199) clang version 6.0.1

that does have the flags.
This commit is contained in:
Brad King
2018-04-02 14:44:39 -04:00
parent 1b6ec4b9e3
commit 12e6796b62
1 changed files with 9 additions and 2 deletions
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11
Modules/Compiler/Clang-CXX.cmake
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@@ -32,7 +32,12 @@ if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std=gnu++1y")
endif()
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
set(_clang_version_std17 5.0)
if(CMAKE_SYSTEM_NAME STREQUAL "Android")
set(_clang_version_std17 6.0)
endif()
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "${_clang_version_std17}")
set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std=c++17")
set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++17")
elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5)
@@ -40,10 +45,12 @@ if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++1z")
endif()
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "${_clang_version_std17}")
set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "-std=c++2a")
set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++2a")
endif()
unset(_clang_version_std17)
else()
# clang-cl does not know these options because it behaves like cl.exe
set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "")