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| -rw-r--r-- | engine.mk | 12 |
1 files changed, 12 insertions, 0 deletions
@@ -224,6 +224,18 @@ ifeq ($(ARCH),riscv) # TODO: This is no longer true as of LLVM 15, so should add a version check ifeq ($(LINKER_TYPE),lld) ARCH_COMPILEFLAGS += -mno-relax +# Work around out-of-range undef-weak relocations when building with clang and +# linking with ld.lld. This is not a problem with ld.bfd since ld.bfd rewrites +# the instructions to avoid the out-of-range PC-relative relocation +# See https://github.com/riscv-non-isa/riscv-elf-psabi-doc/issues/126 for more +# details. For now, the simplest workaround is to build with -fpie when using +# a version of clang that does not include https://reviews.llvm.org/D107280. +# TODO: Add a clang 17 version check now that the review has been merged. +ifeq ($(COMPILER_TYPE),clang) +# We also add the -fdirect-access-external-data flag is added to avoid the +# majority of the performance overhead caused by -fPIE. +ARCH_COMPILEFLAGS += -fPIE -fdirect-access-external-data +endif endif endif |