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Check for VS 2015 or later at configure time.
Fail if we don't have it, as we require it. If we're using MSVC, skip the tests for options to request C99 compatibility - either we have VS 2015, which is sufficient, or we don't, in which case we fail.
This commit is contained in:
Guy Harris
parent
3a000d8878
commit
eb92d85cdf
133
CMakeLists.txt
133
CMakeLists.txt
@ -5,74 +5,83 @@ set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/Modules)
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project(tcpdump)
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#
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# Try to enable as many C99 features as we can.
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# At minimum, we want C++/C99-style // comments.
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# If we're building with Visual Studio, we require Visual Studio 2015,
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# in order to get sufficient C99 compatibility. Check for that.
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#
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# Newer versions of compilers might default to supporting C99, but older
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# versions may require a special flag.
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#
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# Prior to CMake 3.1, setting CMAKE_C_STANDARD will not have any effect,
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# so, unless and until we require CMake 3.1 or later, we have to do it
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# ourselves on pre-3.1 CMake, so we just do it ourselves on all versions
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# of CMake.
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#
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# Note: with CMake 3.1 through 3.5, the only compilers for which CMake
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# handles CMAKE_C_STANDARD are GCC and Clang. 3.6 adds support only
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# for Intel C; 3.9 adds support for PGI C, Sun C, and IBM XL C, and
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# 3.10 adds support for Cray C and IAR C, but no version of CMake has
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# support for HP C. Therefore, even if we use CMAKE_C_STANDARD with
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# compilers for which CMake supports it, we may still have to do it
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# ourselves on other compilers.
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#
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# See the CMake documentation for the CMAKE_<LANG>_COMPILER_ID variables
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# for a list of compiler IDs.
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#
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# We don't worry about MSVC; it doesn't have such a flag - either it
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# doesn't support the C99 features we need at all, or it supports them
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# regardless of the compiler flag.
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#
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# XXX - this just tests whether the option works and adds it if it does.
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# We don't test whether it's necessary in order to get the C99 features
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# that we use; if we ever have a user who tries to compile with a compiler
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# that can't be made to support those features, we can add a test to make
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# sure we actually *have* C99 support.
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#
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include(CheckCCompilerFlag)
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macro(check_and_add_compiler_option _option)
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message(STATUS "Checking C compiler flag ${_option}")
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string(REPLACE "=" "-" _temp_option_variable ${_option})
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string(REGEX REPLACE "^-" "" _option_variable ${_temp_option_variable})
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check_c_compiler_flag("${_option}" ${_option_variable})
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if(${${_option_variable}})
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set(C_ADDITIONAL_FLAGS "${C_ADDITIONAL_FLAGS} ${_option}")
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if(MSVC)
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if(MSVC_VERSION LESS 1900)
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message(FATAL_ERROR "Visual Studio 2015 or later is required")
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endif()
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endmacro()
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set(C_ADDITIONAL_FLAGS "")
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if(CMAKE_C_COMPILER_ID MATCHES "GNU" OR
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CMAKE_C_COMPILER_ID MATCHES "Clang")
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check_and_add_compiler_option("-std=gnu99")
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elseif(CMAKE_C_COMPILER_ID MATCHES "XL")
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#
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# Treat source files as being in UTF-8 with MSVC if it's not using
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# the Clang front end.
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# We assume that UTF-8 source is OK with other compilers and with
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# MSVC if it's using the Clang front end.
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#
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if(NOT ${CMAKE_C_COMPILER} MATCHES "clang*")
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set(C_ADDITIONAL_FLAGS "${C_ADDITIONAL_FLAGS} /utf-8")
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endif(NOT ${CMAKE_C_COMPILER} MATCHES "clang*")
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else(MSVC)
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#
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# We want support for extensions picked up for GNU C compatibility,
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# so we use -qlanglvl=extc99.
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# Try to enable as many C99 features as we can.
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# At minimum, we want C++/C99-style // comments.
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#
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check_and_add_compiler_option("-qlanglvl=extc99")
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elseif(CMAKE_C_COMPILER_ID MATCHES "HP")
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check_and_add_compiler_option("-AC99")
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elseif(CMAKE_C_COMPILER_ID MATCHES "Sun")
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check_and_add_compiler_option("-xc99")
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elseif(CMAKE_C_COMPILER_ID MATCHES "Intel")
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check_and_add_compiler_option("-c99")
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endif()
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# Newer versions of compilers might default to supporting C99, but
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# older versions may require a special flag.
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#
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# Prior to CMake 3.1, setting CMAKE_C_STANDARD will not have any effect,
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# so, unless and until we require CMake 3.1 or later, we have to do it
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# ourselves on pre-3.1 CMake, so we just do it ourselves on all versions
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# of CMake.
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#
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# Note: with CMake 3.1 through 3.5, the only compilers for which CMake
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# handles CMAKE_C_STANDARD are GCC and Clang. 3.6 adds support only
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# for Intel C; 3.9 adds support for PGI C, Sun C, and IBM XL C, and
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# 3.10 adds support for Cray C and IAR C, but no version of CMake has
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# support for HP C. Therefore, even if we use CMAKE_C_STANDARD with
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# compilers for which CMake supports it, we may still have to do it
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# ourselves on other compilers.
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#
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# See the CMake documentation for the CMAKE_<LANG>_COMPILER_ID variables
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# for a list of compiler IDs.
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#
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#
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# XXX - this just tests whether the option works and adds it if it does.
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# We don't test whether it's necessary in order to get the C99 features
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# that we use; if we ever have a user who tries to compile with a compiler
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# that can't be made to support those features, we can add a test to make
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# sure we actually *have* C99 support.
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#
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include(CheckCCompilerFlag)
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macro(check_and_add_compiler_option _option)
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message(STATUS "Checking C compiler flag ${_option}")
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string(REPLACE "=" "-" _temp_option_variable ${_option})
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string(REGEX REPLACE "^-" "" _option_variable ${_temp_option_variable})
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check_c_compiler_flag("${_option}" ${_option_variable})
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if(${${_option_variable}})
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set(C_ADDITIONAL_FLAGS "${C_ADDITIONAL_FLAGS} ${_option}")
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endif()
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endmacro()
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#
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# Treat source files as being in UTF-8 with MSVC.
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# We assume that UTF-8 source is OK with other compilers.
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#
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if(MSVC AND NOT ${CMAKE_C_COMPILER} MATCHES "clang*")
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set(C_ADDITIONAL_FLAGS "${C_ADDITIONAL_FLAGS} /utf-8")
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endif(MSVC AND NOT ${CMAKE_C_COMPILER} MATCHES "clang*")
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set(C_ADDITIONAL_FLAGS "")
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if(CMAKE_C_COMPILER_ID MATCHES "GNU" OR
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CMAKE_C_COMPILER_ID MATCHES "Clang")
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check_and_add_compiler_option("-std=gnu99")
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elseif(CMAKE_C_COMPILER_ID MATCHES "XL")
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#
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# We want support for extensions picked up for GNU C compatibility,
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# so we use -qlanglvl=extc99.
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#
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check_and_add_compiler_option("-qlanglvl=extc99")
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elseif(CMAKE_C_COMPILER_ID MATCHES "HP")
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check_and_add_compiler_option("-AC99")
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elseif(CMAKE_C_COMPILER_ID MATCHES "Sun")
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check_and_add_compiler_option("-xc99")
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elseif(CMAKE_C_COMPILER_ID MATCHES "Intel")
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check_and_add_compiler_option("-c99")
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endif()
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endif(MSVC)
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set(LIBRARY_NAME netdissect)
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