Avoid using C++14 to build CMake if cstdio breaks
The GNU 4.8 standard library's cstdio header is not aware that C++14 honors C11's removal of "gets" from stdio.h and results in an error: /.../include/c++/4.8/cstdio:120:11: error: no member named 'gets' in the global namespace Detect this problematic case and default to using C++11 instead of C++14 for building CMake itself.
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@ -41,7 +41,12 @@ if(NOT DEFINED CMAKE_C_STANDARD AND NOT CMake_NO_C_STANDARD)
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set(CMAKE_C_STANDARD 11)
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set(CMAKE_C_STANDARD 11)
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endif()
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endif()
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if(NOT DEFINED CMAKE_CXX_STANDARD AND NOT CMake_NO_CXX_STANDARD)
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if(NOT DEFINED CMAKE_CXX_STANDARD AND NOT CMake_NO_CXX_STANDARD)
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set(CMAKE_CXX_STANDARD 14)
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include(${CMake_SOURCE_DIR}/Source/Checks/cm_cxx14_cstdio.cmake)
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if(NOT CMake_CXX14_CSTDIO_BROKEN)
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set(CMAKE_CXX_STANDARD 14)
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else()
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set(CMAKE_CXX_STANDARD 11)
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endif()
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endif()
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endif()
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# option to set the internal encoding of CMake to UTF-8
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# option to set the internal encoding of CMake to UTF-8
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@ -0,0 +1,33 @@
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set(CMake_CXX14_CSTDIO_BROKEN 0)
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if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang" AND CMAKE_CXX14_STANDARD_COMPILE_OPTION)
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if(NOT DEFINED CMake_CXX14_CSTDIO_WORKS)
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message(STATUS "Checking if compiler supports C++14 cstdio")
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try_compile(CMake_CXX14_CSTDIO_WORKS
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${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_LIST_DIR}/cm_cxx14_cstdio.cpp
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CMAKE_FLAGS -DCMAKE_CXX_STANDARD=14
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OUTPUT_VARIABLE OUTPUT
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)
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if(CMake_CXX14_CSTDIO_WORKS AND "${OUTPUT}" MATCHES "error: no member named.*gets.*in the global namespace")
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set_property(CACHE CMake_CXX14_CSTDIO_WORKS PROPERTY VALUE 0)
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endif()
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if(CMake_CXX14_CSTDIO_WORKS)
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message(STATUS "Checking if compiler supports C++14 cstdio - yes")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Determining if compiler supports C++14 cstdio passed with the following output:\n"
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"${OUTPUT}\n"
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"\n"
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)
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else()
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message(STATUS "Checking if compiler supports C++14 cstdio - no")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if compiler supports C++14 cstdio failed with the following output:\n"
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"${OUTPUT}\n"
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"\n"
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)
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endif()
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endif()
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if(NOT CMake_CXX14_CSTDIO_WORKS)
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set(CMake_CXX14_CSTDIO_BROKEN 1)
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endif()
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endif()
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@ -0,0 +1,2 @@
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#include <cstdio>
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int main() { return 0; }
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