613a077b05
When building Flang with Clang, we need to do the same quadmath.h wrapping as we do for flang-rt. I extracted the CMake code into FlangCommon.cmake, and cleaned up the arguments passing to execute_process (note that `-###` was treated as `-` in the original code, because `#` starts a comment). I believe the Clang command does not require the input source file, so I removed it as well.
84 lines
3.4 KiB
CMake
84 lines
3.4 KiB
CMake
#===-- cmake/modules/FlangCommon.txt ----------------------------===#
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#
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#
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#===------------------------------------------------------------------------===#
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#
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# CMake definitions shared between Flang and Flang-RT
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#
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#===------------------------------------------------------------------------===#
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# The out of tree builds of the compiler and the Fortran runtime
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# must use the same setting of FLANG_RUNTIME_F128_MATH_LIB
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# to be composable. Failure to synchronize this setting may result
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# in linking errors or fatal failures in F128 runtime functions.
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set(FLANG_RUNTIME_F128_MATH_LIB "" CACHE STRING
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"Specifies the target library used for implementing IEEE-754 128-bit float \
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math in F18 runtime, e.g. it might be libquadmath for targets where \
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REAL(16) is mapped to __float128, or libm for targets where REAL(16) \
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is mapped to long double, etc."
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)
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if (FLANG_RUNTIME_F128_MATH_LIB)
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add_compile_definitions(FLANG_RUNTIME_F128_MATH_LIB="${FLANG_RUNTIME_F128_MATH_LIB}")
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endif()
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# Check if 128-bit float computations can be done via long double
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# Note that '-nostdinc++' might be implied when this code kicks in
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# (see 'runtimes/CMakeLists.txt'), so we cannot use 'cfloat' C++ header
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# file in the test below.
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# Compile it as C.
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check_c_source_compiles(
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"#include <float.h>
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#if LDBL_MANT_DIG != 113
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#error LDBL_MANT_DIG != 113
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#endif
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int main() { return 0; }
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"
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HAVE_LDBL_MANT_DIG_113)
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# Discover the GCC installation, when the build compiler is Clang,
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# and try to find quadmath.h there. Set FLANG_INCLUDE_QUADMATH_H
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# to the path to quadmath.h, if found.
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if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
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if (NOT DEFINED FLANG_GCC_RESOURCE_DIR)
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set(FLANG_GCC_RESOURCE_DIR "FLANG_GCC_RESOURCE_DIR-NOTFOUND")
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# Prepare CMAKE_CXX_FLAGS so that they can be passed to execute_process
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# as separate flags.
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separate_arguments(flags UNIX_COMMAND "${CMAKE_CXX_FLAGS}")
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execute_process(
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COMMAND "${CMAKE_CXX_COMPILER}" ${flags} -v "-###"
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ERROR_FILE "${CMAKE_CURRENT_BINARY_DIR}/clang_gcc_root_result"
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)
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file(STRINGS "${CMAKE_CURRENT_BINARY_DIR}/clang_gcc_root_result" _errorresult)
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foreach (_line IN LISTS _errorresult)
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string(REGEX MATCH
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"^Selected GCC installation: (.+)$"
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_match
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"${_line}")
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if (CMAKE_MATCH_1)
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set(FLANG_GCC_RESOURCE_DIR "${CMAKE_MATCH_1}")
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message(STATUS "Found GCC installation selected by Clang: ${FLANG_GCC_RESOURCE_DIR}")
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break()
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endif ()
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endforeach ()
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set(FLANG_GCC_RESOURCE_DIR "${FLANG_GCC_RESOURCE_DIR}" CACHE INTERNAL "Path to GCC's resource dir selected by Clang" FORCE)
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endif ()
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endif ()
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check_include_file("quadmath.h" FOUND_QUADMATH_H)
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if (FOUND_QUADMATH_H)
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message(STATUS "quadmath.h found without additional include paths")
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set(FLANG_INCLUDE_QUADMATH_H "<quadmath.h>")
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elseif (FLANG_GCC_RESOURCE_DIR)
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cmake_push_check_state()
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list(APPEND CMAKE_REQUIRED_INCLUDES "${FLANG_GCC_RESOURCE_DIR}/include")
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check_include_file("quadmath.h" FOUND_GCC_QUADMATH_H)
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cmake_pop_check_state()
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if (FOUND_GCC_QUADMATH_H)
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message(STATUS "quadmath.h found in Clang's selected GCC installation")
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set(FLANG_INCLUDE_QUADMATH_H "\"${FLANG_GCC_RESOURCE_DIR}/include/quadmath.h\"")
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endif ()
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endif ()
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