Bug 1659239

Summary: Default configuration does not compile with ASAN out of the box powerpc64le
Product: [Fedora] Fedora Reporter: dn49i7+hdm8u5shsmcg
Component: compiler-rtAssignee: Tom Stellard <tstellar>
Status: ASSIGNED --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 29CC: airlied, dan, davejohansen, hannsj_uhl, siddharth.kde, tstellar
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Hardware: ppc64le   
OS: Linux   
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Last Closed: Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 1071880    

Description dn49i7+hdm8u5shsmcg 2018-12-13 21:09:41 UTC
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:
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:


CC=clang CFLAGS="-g -fsanitize=address" LDFLAGS="-L/usr/lib64/clang/7.0.0/lib/ -lclang_rt.asan-powerpc64le" make
on some project


Comment 1 Tom Stellard 2018-12-13 21:17:17 UTC
Can you attach the output of `dnf info clang compiler-rt`

Comment 2 dn49i7+hdm8u5shsmcg 2018-12-13 21:24:24 UTC
(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.

Comment 3 Tom Stellard 2018-12-14 02:53:39 UTC
Can you post the output of this command:
echo 'int main(){}' | clang  -fsanitize=address -x c - -###

Comment 4 dn49i7+hdm8u5shsmcg 2018-12-15 14:05:03 UTC
(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

Comment 5 dn49i7+hdm8u5shsmcg 2018-12-15 14:10:25 UTC
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

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)

	$(RM) $(OBJS)

fclean: clean
	$(RM) $(NAME)

.PHONY: all clean fclean

Comment 6 Tom Stellard 2018-12-18 05:20:54 UTC
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.