[RISCV] Port Classic Flang to 64-bit RISC-V #1462
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This patch changes CMakeLists.txt and build scripts to support cross-compiling Fortran programs in the frontend, and to cross-compile all runtime libraries for the target architecture. LLVM must support the specified target. Co-authored-by: Prabhdeep Singh Soni <[email protected]>
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This PR adds support for RISC-V to Classic Flang, and changes the build script and CMake files to build Classic Flang as a cross-compiler. Target-specific frontend tools (e.g.
riscv64-unknown-linux-gnu-flang1,riscv64-unknown-linux-gnu-flang2) are installed under$LLVM_DIR/bin/, while target-specific Fortran runtime libraries are installed along with OpenMP libraries under$LLVM_DIR/lib/$target/.See the wiki for instructions on building a cross-compiler for RISCV.
Depends on flang-compiler/classic-flang-llvm-project#205.
Closes #1447.