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#
# Check if the same compile family is used for both C and CXX
#
if (NOT (CMAKE_C_COMPILER_ID STREQUAL CMAKE_CXX_COMPILER_ID))
message(WARNING "CMAKE_C_COMPILER_ID (${CMAKE_C_COMPILER_ID}) is different "
"from CMAKE_CXX_COMPILER_ID (${CMAKE_CXX_COMPILER_ID})."
"The final binary may be unusable.")
endif()
# We support building with Clang and gcc. First check
# what we're using for build.
#
if (CMAKE_C_COMPILER_ID STREQUAL Clang)
set(CMAKE_COMPILER_IS_CLANG ON)
set(CMAKE_COMPILER_IS_GNUCC OFF)
set(CMAKE_COMPILER_IS_GNUCXX OFF)
endif()
#
# Check supported standards
#
if((NOT HAVE_STD_C11 AND NOT HAVE_STD_GNU99) OR
(NOT HAVE_STD_CXX11 AND NOT HAVE_STD_GNUXX0X))
set(CMAKE_REQUIRED_FLAGS "-std=c11")
check_c_source_compiles("int main(void) { return 0; }" HAVE_STD_C11)
set(CMAKE_REQUIRED_FLAGS "-std=gnu99")
check_c_source_compiles("int main(void) { return 0; }" HAVE_STD_GNU99)
set(CMAKE_REQUIRED_FLAGS "-std=c++11")
check_cxx_source_compiles("int main(void) { return 0; }" HAVE_STD_CXX11)
set(CMAKE_REQUIRED_FLAGS "-std=gnu++0x")
check_cxx_source_compiles("int main(void) { return 0; }" HAVE_STD_GNUXX0X)
set(CMAKE_REQUIRED_FLAGS "")
endif()
if((NOT HAVE_STD_C11 AND NOT HAVE_STD_GNU99) OR
(NOT HAVE_STD_CXX11 AND NOT HAVE_STD_GNUXX0X))
message (FATAL_ERROR
"${CMAKE_C_COMPILER} should support -std=c11 or -std=gnu99. "
"${CMAKE_CXX_COMPILER} should support -std=c++11 or -std=gnu++0x. "
"Please consider upgrade to gcc 4.5+ or clang 3.2+.")
endif()
#
# Perform build type specific configuration.
#
if (CMAKE_COMPILER_IS_GNUCC)
set (CC_DEBUG_OPT "-ggdb")
else()
set (CC_DEBUG_OPT "-g")
endif()
set (CMAKE_C_FLAGS_DEBUG
"${CMAKE_C_FLAGS_DEBUG} ${CC_DEBUG_OPT} -O0")
set (CMAKE_C_FLAGS_RELWITHDEBUGINFO
"${CMAKE_C_FLAGS_RELWITHDEBUGINFO} ${CC_DEBUG_OPT} -O2")
set (CMAKE_CXX_FLAGS_DEBUG
"${CMAKE_CXX_FLAGS_DEBUG} ${CC_DEBUG_OPT} -O0")
set (CMAKE_CXX_FLAGS_RELWITHDEBUGINFO
"${CMAKE_CXX_FLAGS_RELWITHDEBUGINFO} ${CC_DEBUG_OPT} -O2")
unset(CC_DEBUG_OPT)
#
# Set flags for all include files: those maintained by us and
# coming from third parties.
# We must set -fno-omit-frame-pointer here, since we rely
# on frame pointer when getting a backtrace, and it must
# be used consistently across all object files.
# The same reasoning applies to -fno-stack-protector switch.
# Since we began using luajit, which uses gcc stack unwind
# internally, we also need to make sure all code is compiled
# with unwind info.
#
add_compile_flags("C;CXX"
"-fno-omit-frame-pointer"
"-fno-stack-protector"
"-fexceptions"
"-funwind-tables")
if (NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
# Remove VALGRIND code and assertions in *any* type of release build.
add_definitions("-DNDEBUG" "-DNVALGRIND")
endif()
macro(enable_tnt_compile_flags)
# Tarantool code is written in GNU C dialect.
# Additionally, compile it with more strict flags than the rest
# of the code.
# Set standard
if (HAVE_STD_C11)
add_compile_flags("C" "-std=c11")
else()
add_compile_flags("C" "-std=gnu99")
endif()
if (HAVE_STD_CXX11)
add_compile_flags("CXX" "-std=c++11")
else()
add_compile_flags("CXX" "-std=gnu++0x")
endif()
# Disable Run-time type information
add_compile_flags("CXX" "-fno-rtti")
add_compile_flags("C;CXX"
"-Wall"
"-Wextra"
"-Wno-sign-compare"
"-Wno-strict-aliasing"
)
if (CMAKE_COMPILER_IS_GNUCXX)
# G++ bug. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31488
add_compile_flags("CXX"
"-Wno-invalid-offsetof"
)
endif()
add_definitions("-D__STDC_FORMAT_MACROS=1")
add_definitions("-D__STDC_LIMIT_MACROS=1")
add_definitions("-D__STDC_CONSTANT_MACROS=1")
# Only add -Werror if it's a debug build, done by developers.
# Release builds should not cause extra trouble.
if ((${CMAKE_BUILD_TYPE} STREQUAL "Debug")
AND HAVE_STD_C11 AND HAVE_STD_CXX11)
add_compile_flags("C;CXX" "-Werror")
endif()
endmacro(enable_tnt_compile_flags)
#
# GCC started to warn for unused result starting from 4.2, and
# this is when it introduced -Wno-unused-result
# GCC can also be built on top of llvm runtime (on mac).
#
check_c_compiler_flag("-Wno-unused-result" CC_HAS_WNO_UNUSED_RESULT)
check_c_compiler_flag("-Wno-unused-value" CC_HAS_WNO_UNUSED_VALUE)
check_c_compiler_flag("-fno-strict-aliasing" CC_HAS_FNO_STRICT_ALIASING)
check_c_compiler_flag("-Wno-comment" CC_HAS_WNO_COMMENT)
check_c_compiler_flag("-Wno-parentheses" CC_HAS_WNO_PARENTHESES)
if (CMAKE_COMPILER_IS_CLANG OR CMAKE_COMPILER_IS_GNUCC)
set(HAVE_BUILTIN_CTZ 1)
set(HAVE_BUILTIN_CTZLL 1)
set(HAVE_BUILTIN_CLZ 1)
set(HAVE_BUILTIN_CLZLL 1)
set(HAVE_BUILTIN_POPCOUNT 1)
set(HAVE_BUILTIN_POPCOUNTLL 1)
set(HAVE_BUILTIN_BSWAP32 1)
set(HAVE_BUILTIN_BSWAP64 1)
else()
set(HAVE_BUILTIN_CTZ 0)
set(HAVE_BUILTIN_CTZLL 0)
set(HAVE_BUILTIN_CLZ 0)
set(HAVE_BUILTIN_CLZLL 0)
set(HAVE_BUILTIN_POPCOUNT 0)
set(HAVE_BUILTIN_POPCOUNTLL 0)
set(HAVE_BUILTIN_BSWAP32 0)
set(HAVE_BUILTIN_BSWAP64 0)
endif()
if (NOT HAVE_BUILTIN_CTZ OR NOT HAVE_BUILTIN_CTZLL)
# Check if -D_GNU_SOURCE has been defined and add this flag to
# CMAKE_REQUIRED_DEFINITIONS in order to get check_prototype_definition work
get_property(var DIRECTORY PROPERTY COMPILE_DEFINITIONS)
list(FIND var "_GNU_SOURCE" var)
if (NOT var EQUAL -1)
set(CMAKE_REQUIRED_FLAGS "-Wno-error")
set(CMAKE_REQUIRED_DEFINITIONS "-D_GNU_SOURCE")
check_c_source_compiles("#include <string.h>\n#include <strings.h>\nint main(void) { return ffsl(0L); }"
HAVE_FFSL)
check_c_source_compiles("#include <string.h>\n#include <strings.h>\nint main(void) { return ffsll(0UL); }"
HAVE_FFSLL)
endif()
endif()
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