b55f7512a7
Extract Flang's runtime library to use the LLVM_ENABLE_RUNTIME mechanism. It will only become active when `LLVM_ENABLE_RUNTIMES=flang-rt` is used, which also changes the `FLANG_INCLUDE_RUNTIME` to `OFF` so the old runtime build rules do not conflict. This also means that unless `LLVM_ENABLE_RUNTIMES=flang-rt` is passed, nothing changes with the current build process. Motivation: * Consistency with LLVM's other runtime libraries (compiler-rt, libc, libcxx, openmp offload, ...) * Allows compiling the runtime for multiple targets at once using the LLVM_RUNTIME_TARGETS configuration options * Installs the runtime into the compiler's per-target resource directory so it can be automatically found even when cross-compiling Also see RFC discussion at https://discourse.llvm.org/t/rfc-use-llvm-enable-runtimes-for-flangs-runtime/80826
44 lines
1.6 KiB
CMake
44 lines
1.6 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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check_cxx_source_compiles(
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"#include <cfloat>
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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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include(TestBigEndian)
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test_big_endian(IS_BIGENDIAN)
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if (IS_BIGENDIAN)
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add_compile_definitions(FLANG_BIG_ENDIAN=1)
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else ()
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add_compile_definitions(FLANG_LITTLE_ENDIAN=1)
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endif ()
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