[Driver] Enable Classic Flang cross-compilation, e.g. from X86 to AArch64 #205
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…ch64 Co-authored-by: Prabhdeep Singh Soni <prabhdeep.singh.soni3@huawei.com>
Also modified cmake/Modules/GetClangResourceDir.cmake to work around a missing definition for PACKAGE_VERSION when cross-compiling OpenMP libraries.
This fixes a number of OpenMP test failures on macOS.
See llvm/llvm-project#81967. Adapted from upstream commit 175b533.
pawosm-arm
approved these changes
Nov 26, 2024
shivaramaarao
approved these changes
Nov 27, 2024
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This PR changes how the driver finds the target-specific Classic Flang frontend tools (e.g.
aarch64-unknown-linux-gnu-flang1,aarch64-unknown-linux-gnu-flang2) and headers, and modifies the build script to support building the cross-compiling toolchain, which must include LLD (LLVM's linker that support all targets), and OpenMP libraries for the target architecture. Target-specific libraries are installed under$LLVM_DIR/lib/$target/, which is how upstream LLVM installs them by default.See the wiki for instructions on building a Classic Flang cross-compiler.