Description of problem: When compiling with -fsanitize=address, it throws undefined references I run Fedora 29 Server with XFCE and xfce4-terminal, standard setup environment wise Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: Run CC=clang CFLAGS="-g -fsanitize=address" make on some project will throw undefined references Actual results: undefined references to asan functions Expected results: compiles without problems Additional info: Workaround: Run CC=clang CFLAGS="-g -fsanitize=address" LDFLAGS="-L/usr/lib64/clang/7.0.0/lib/ -lclang_rt.asan-powerpc64le" make on some project works
Can you attach the output of `dnf info clang compiler-rt`
(In reply to Tom Stellard from comment #1) > Can you attach the output of `dnf info clang compiler-rt` Installed Packages Name : clang Version : 7.0.0 Release : 2.fc29 Arch : ppc64le Size : 1.7 M Source : clang-7.0.0-2.fc29.src.rpm Repo : @System From repo : fedora Summary : A C language family front-end for LLVM URL : http://llvm.org License : NCSA Description : clang: noun : 1. A loud, resonant, metallic sound. : 2. The strident call of a crane or goose. : 3. C-language family front-end toolkit. : : The goal of the Clang project is to create a new C, C++, Objective C : and Objective C++ front-end for the LLVM compiler. Its tools are built : as libraries and designed to be loosely-coupled and extensible. Name : compiler-rt Version : 7.0.0 Release : 1.fc29 Arch : ppc64le Size : 19 M Source : compiler-rt-7.0.0-1.fc29.src.rpm Repo : @System From repo : fedora Summary : LLVM "compiler-rt" runtime libraries URL : http://llvm.org License : NCSA or MIT Description : The compiler-rt project is a part of the LLVM project. It provides : implementation of the low-level target-specific hooks required by : code generation, sanitizer runtimes and profiling library for code : instrumentation, and Blocks C language extension.
Can you post the output of this command: echo 'int main(){}' | clang -fsanitize=address -x c - -###
(In reply to Tom Stellard from comment #3) > Can you post the output of this command: > echo 'int main(){}' | clang -fsanitize=address -x c - -### clang version 7.0.0 (Fedora 7.0.0-2.fc29) Target: powerpc64le-unknown-linux-gnu Thread model: posix InstalledDir: /usr/bin "/usr/bin/clang-7" "-cc1" "-triple" "powerpc64le-unknown-linux-gnu" "-emit-obj" "-mrelax-all" "-disable-free" "-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "-" "-mrelocation-model" "pic" "-pic-level" "2" "-mthread-model" "posix" "-mdisable-fp-elim" "-fmath-errno" "-masm-verbose" "-mconstructor-aliases" "-munwind-tables" "-fuse-init-array" "-target-cpu" "ppc64le" "-mfloat-abi" "hard" "-target-abi" "elfv2" "-dwarf-column-info" "-debugger-tuning=gdb" "-resource-dir" "/usr/lib64/clang/7.0.0" "-internal-isystem" "/usr/local/include" "-internal-isystem" "/usr/lib64/clang/7.0.0/include" "-internal-externc-isystem" "/include" "-internal-externc-isystem" "/usr/include" "-fdebug-compilation-dir" "%workingdir%" "-ferror-limit" "19" "-fmessage-length" "146" "-fsanitize=address" "-fsanitize-address-use-after-scope" "-fno-assume-sane-operator-new" "-fno-signed-char" "-fobjc-runtime=gcc" "-fdiagnostics-show-option" "-fcolor-diagnostics" "-o" "/tmp/--35c8d1.o" "-x" "c" "-" "-faddrsig" "/usr/bin/ld" "--hash-style=gnu" "--no-add-needed" "--build-id" "--eh-frame-hdr" "-m" "elf64lppc" "-dynamic-linker" "/lib64/ld64.so.2" "-o" "a.out" "/usr/bin/../lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/crt1.o" "/usr/bin/../lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/crti.o" "/usr/bin/../lib/gcc/ppc64le-redhat-linux/8/crtbegin.o" "-L/usr/bin/../lib/gcc/ppc64le-redhat-linux/8" "-L/usr/bin/../lib/gcc/ppc64le-redhat-linux/8/../../../../lib64" "-L/usr/bin/../lib64" "-L/lib/../lib64" "-L/usr/lib/../lib64" "-L/usr/bin/../lib/gcc/ppc64le-redhat-linux/8/../../.." "-L/usr/bin/../lib" "-L/lib" "-L/usr/lib" "--whole-archive" "/usr/lib64/clang/7.0.0/lib/linux/libclang_rt.asan-powerpc64le.a" "--no-whole-archive" "--dynamic-list=/usr/lib64/clang/7.0.0/lib/linux/libclang_rt.asan-powerpc64le.a.syms" "/tmp/--35c8d1.o" "--no-as-needed" "-lpthread" "-lrt" "-lm" "-ldl" "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed" "-lc" "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed" "/usr/bin/../lib/gcc/ppc64le-redhat-linux/8/crtend.o" "/usr/bin/../lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/crtn.o" %workingdir% is me stripping out the path
Doing echo 'int main(){char* p = 0x32; char d = *p;}' | clang -fsanitize=address -x c - - works and compiles with ASAN here's my Makefile, I don't think it should conflict; CFLAGS += -Wall -Werror -Wextra -Iinclude LDFLAGS += CFLAGS += `pkg-config --cflags somelib` LDFLAGS += `pkg-config --libs somelib` NAME = proj SRCS = src/file1.c src/file2.c src/file3.c OBJS = ${SRCS:.c=.o} $(NAME): $(OBJS) $(CC) $(LDFLAGS) $(OBJS) -o $(NAME) all: $(NAME) clean: $(RM) $(OBJS) fclean: clean $(RM) $(NAME) .PHONY: all clean fclean
The problem is that -fsanitize=address is only added to CFLAGS and not LDFLAGS. When you are doing separate compile and link steps you need to explicitly add the flag to both steps.
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