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if(CMAKE_COMPILER_IS_GNUCXX)
include(CheckCXXCompilerFlag)
# Additional warnings for GCC
set(CMAKE_CXX_FLAGS_WARN "-Wnon-virtual-dtor -Wno-long-long -ansi -Wcast-align -Wchar-subscripts -Wall -Wextra -Wpointer-arith -Wformat-security -Woverloaded-virtual -Wshadow -Wunused-parameter -fno-check-new -fno-common -Werror=undef")
# This flag is useful as not returning from a non-void function is an error
# with MSVC, but it is not supported on all GCC compiler versions
check_cxx_compiler_flag(-Werror=return-type HAVE_GCC_ERROR_RETURN_TYPE)
if(HAVE_GCC_ERROR_RETURN_TYPE)
set(CMAKE_CXX_FLAGS_ERROR "-Werror=return-type")
endif()
# If we are compiling on Linux then set some extra linker flags too
if(CMAKE_SYSTEM_NAME MATCHES Linux)
option(VTK_LINKER_FATAL_WARNINGS "Specify if linker warnings must be considered as errors." OFF)
mark_as_advanced(VTK_LINKER_FATAL_WARNINGS)
if(VTK_LINKER_FATAL_WARNINGS)
set(VTK_EXTRA_SHARED_LINKER_FLAGS "-Wl,--fatal-warnings")
endif()
set(CMAKE_SHARED_LINKER_FLAGS
"${VTK_EXTRA_SHARED_LINKER_FLAGS} -Wl,-lc ${CMAKE_SHARED_LINKER_FLAGS}")
set(CMAKE_MODULE_LINKER_FLAGS
"${VTK_EXTRA_SHARED_LINKER_FLAGS} -Wl,-lc ${CMAKE_SHARED_LINKER_FLAGS}")
set (CMAKE_EXE_LINKER_FLAGS
"${VTK_EXTRA_SHARED_LINKER_FLAGS} -Wl,-lc ${CMAKE_SHARED_LINKER_FLAGS}")
endif()
# Set up the debug CXX_FLAGS for extra warnings
option(VTK_EXTRA_COMPILER_WARNINGS
"Add compiler flags to do stricter checking when building debug." OFF)
if(VTK_EXTRA_COMPILER_WARNINGS)
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO
"${CMAKE_CXX_FLAGS_RELWITHDEBINFO} ${CMAKE_CXX_FLAGS_WARN}")
set(CMAKE_CXX_FLAGS_DEBUG
"${CMAKE_CXX_FLAGS_DEBUG} ${CMAKE_CXX_FLAGS_WARN} ${CMAKE_CXX_FLAGS_ERROR}")
endif()
endif()
# Intel OneAPI compilers >= 2021.2.0 turn on "fast math" at any non-zero
# optimization level. Suppress this non-standard behavior using the
# `-fp-model=precise` flag.
set(intel_oneapi_compiler_detections)
set(intel_oneapi_compiler_version_min "2021.2.0")
foreach (lang IN ITEMS C CXX Fortran)
if (CMAKE_VERSION VERSION_LESS "3.14" AND lang STREQUAL "Fortran") # XXX(cmake-3.14): `Fortran_COMPILER_ID` genex
continue ()
endif ()
# Detect the IntelLLVM compiler for the given language.
set(is_lang "$<COMPILE_LANGUAGE:${lang}>")
set(is_intelllvm "$<${lang}_COMPILER_ID:IntelLLVM>")
set(is_intelllvm_fastmath_assuming_version "$<VERSION_GREATER_EQUAL:$<${lang}_COMPILER_VERSION>,${intel_oneapi_compiler_version_min}>")
list(APPEND intel_oneapi_compiler_detections
"$<AND:${is_lang},${is_intelllvm},${is_intelllvm_fastmath_assuming_version}>")
endforeach ()
string(REPLACE ";" "," intel_oneapi_compiler_detections "${intel_oneapi_compiler_detections}")
if (TARGET vtkbuild)
target_compile_options(vtkbuild
INTERFACE
"$<BUILD_INTERFACE:$<$<OR:${intel_oneapi_compiler_detections}>:-fp-model=precise>>")
endif ()
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