Support MemorySanitizer build #1988
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Uninitialized values occur when stack- or heap-allocated memory is read before it is written. MSan detects cases * Uninitialized value was used in a conditional branch. * Uninitialized pointer was used for memory accesses. * Uninitialized value was passed or returned from a function call. * Uninitialized data was passed into some libc calls. $ git clone https://github.com/llvm/llvm-project.git $ cd ~/llvm-project/ $ mkdir build/ && cd build $ CC=clang CXX=clang++ cmake -G Ninja ../llvm \ -DLLVM_ENABLE_PROJECTS="clang;compiler-rt" \ -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind" \ -DCOMPILER_RT_BUILD_SANITIZERS=ON \ -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON \ -DLLVM_ENABLE_LIBCXX=ON \ -DLLVM_TARGETS_TO_BUILD="X86" \ -DCMAKE_BUILD_TYPE=Release \ -DCMAKE_C_COMPILER_TARGET=x86_64-unknown-linux-gnu $ ninja $ cd ~/uftrace/ $ ./configure CC=$HOME/llvm-project/build/bin/clang $ make MSAN=1 $ cd tests/ $ ./runtest.py -c=$HOME/llvm-project/build/bin/clang Signed-off-by: Yunseong Kim <yskelg@gmail.com>
namhyung
reviewed
Jan 9, 2025
| DBGINFO_CFLAGS += $(ASAN_CFLAGS) | ||
| TRACEEVENT_CFLAGS += $(ASAN_CFLAGS) | ||
| TEST_CFLAGS += $(ASAN_CFLAGS) | ||
| SAN=$(DEFAULT_SANITIZERS) |
| endif | ||
|
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||
| ifneq ($(SAN),) | ||
| ifeq ($(SAN), all) | ||
| SAN_CFLAGS := -O0 -g -fsanitize=$(DEFAULT_SANITIZERS) | ||
| else ifeq ($(MSAN), 1) | ||
| SAN_CFLAGS := -O0 -g -fsanitize=$(SAN) -fsanitize-memory-track-origins |
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It seems it should be used when memory sanitizer is requested (even with others). What about this?
else ifneq ($(findstring memory, $(SAN)), )
SAN_CFLAGS := -O0 -g -fsanitize=$(SAN) -fsanitize-memory-track-origins
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Uninitialized values occur when stack- or heap-allocated memory is read before it is written. MSan detects cases