Merge pull request #73 from Xeratec/fix/make

Fix problems with GCC optimization and cMake

CHANGELOG.md

@@ -16,6 +16,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Fixed
 - Measure the `wfi` stalls and stalls caused by `opc` properly
 - Fix the allocator initialization
+- After building GCC, copy `riscv.ld` required for cMake to install folder
+- Disable GCC tree-loop-distribute-patterns optimizations causing stack overflows
+- Disable problematic GCC `memset` and `memcpy` built-in functions
 
 ### Changed
 - Increase the default AXI width to 512 for MemPool and TeraPool

CONTRIBUTORS.md

@@ -11,5 +11,6 @@ Thanks to all.
 * Luca Rufer
 * Marc Gantenbein
 * Marco Bertuletti
+* Philip Wiese
 * Sergio Mazzola
 * Yichao Zhang

Makefile

@@ -78,7 +78,8 @@ tc-riscv-gcc:
 	mkdir -p $(GCC_INSTALL_DIR)
 	cd $(CURDIR)/toolchain/riscv-gnu-toolchain && rm -rf build && mkdir -p build && cd build && \
 	../configure --prefix=$(GCC_INSTALL_DIR) --with-arch=rv32im --with-cmodel=medlow --enable-multilib && \
-	$(MAKE) MAKEINFO=true -j4
+	$(MAKE) MAKEINFO=true -j4 && \
+	cp ../riscv.ld $(GCC_INSTALL_DIR)/riscv32-unknown-elf/lib
 
 tc-llvm:
 	mkdir -p $(LLVM_INSTALL_DIR)

software/runtime/runtime.mk

@@ -85,8 +85,8 @@ RISCV_LLVM_TARGET  ?= --target=$(RISCV_TARGET) --sysroot=$(GCC_INSTALL_DIR)/$(RI
 
 RISCV_WARNINGS += -Wunused-variable -Wconversion -Wall -Wextra # -Werror
 RISCV_FLAGS_COMMON_TESTS ?= -march=$(RISCV_ARCH) -mabi=$(RISCV_ABI) -I$(ROOT_DIR) -I$(HALIDE_INCLUDE) -static
-RISCV_FLAGS_COMMON ?= $(RISCV_FLAGS_COMMON_TESTS) -g -std=gnu99 -O3 -ffast-math -fno-common -fno-builtin-printf $(DEFINES) $(RISCV_WARNINGS)
-RISCV_FLAGS_GCC    ?= -mcmodel=medany -Wa,-march=$(RISCV_ARCH_AS) -mtune=mempool # -falign-loops=32 -falign-jumps=32
+RISCV_FLAGS_COMMON ?= $(RISCV_FLAGS_COMMON_TESTS) -g -std=gnu99 -O3  -fno-builtin-memcpy -fno-builtin-memset -ffast-math -fno-common -fno-builtin-printf $(DEFINES) $(RISCV_WARNINGS)
+RISCV_FLAGS_GCC    ?= -mcmodel=medany -Wa,-march=$(RISCV_ARCH_AS) -mtune=mempool -fno-tree-loop-distribute-patterns # -falign-loops=32 -falign-jumps=32
 RISCV_FLAGS_LLVM   ?= -mcmodel=small -mcpu=mempool-rv32 -mllvm -misched-topdown
 
 ifeq ($(COMPILER),gcc)