[LLVMbugs] [Bug 15953] New: Clang links the wrong compiler-rt when building with --coverage

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri May 10 02:22:30 PDT 2013 

http://llvm.org/bugs/show_bug.cgi?id=15953

            Bug ID: 15953
           Summary: Clang links the wrong compiler-rt when building with
                    --coverage
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: magnus.reftel at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

When I pass --coverage to clang (which I build from trunk together with llvm,
projects/compiler-rt and clang/tools/extra), I get a link error. It seems that 
/opt/llvm/r181582/lib/clang/3.4/lib/linux/libclang_rt.profile-x86_64.a does not
get included. It is not a general problem with it not finding the compiler-rt
installation though, as -fsantize=undefined workes fine.

The following transcript shows a hello world program, the link failure that is
printed when only --coverage is specified, that linking succeeds if
libclang_rt.profile-x86_64.a is manually specified, and that
-fsantitize=undefined manages to find libclang_rt.ubsan-x86_64.a on its own.

$ cat hello.c 
#include <stdio.h>

int main(int argc __attribute__((unused)), char* argv[]
__attribute__((unused)))
{
    printf("Hello world\n");
    return 0;
}
$ 
$ 
$ /opt/llvm/r181582/bin/clang -v --coverage hello.c clang version 3.4 (trunk
181582)
Target: x86_64-unknown-linux-gnu
Thread model: posix
 "/opt/llvm/r181582/bin/clang" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj
-mrelax-all -disable-free -main-file-name hello.c -mrelocation-model static
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -fuse-init-array -target-cpu x86-64 -target-linker-version
2.23.2 -v -femit-coverage-notes -femit-coverage-data -resource-dir
/opt/llvm/r181582/bin/../lib/clang/3.4 -internal-isystem /usr/local/include
-internal-isystem /opt/llvm/r181582/bin/../lib/clang/3.4/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-fdebug-compilation-dir /home/magnus/src/clang/coverage -ferror-limit 19
-fmessage-length 80 -mstackrealign -fobjc-runtime=gcc
-fobjc-default-synthesize-properties -fdiagnostics-show-option
-fcolor-diagnostics -backend-option -vectorize-loops -o /tmp/hello-m48ncx.o -x
c hello.c
clang -cc1 version 3.4 based upon LLVM 3.4svn default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /opt/llvm/r181582/bin/../lib/clang/3.4/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
 "/usr/bin/ld" -z relro --hash-style=gnu --build-id --eh-frame-hdr -m
elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/4.7/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/4.7
-L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu
-L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../.. -L/lib -L/usr/lib
/tmp/hello-m48ncx.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc
--as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-linux-gnu/4.7/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crtn.o
/opt/llvm/r181582/bin/../lib/libprofile_rt.a
/tmp/hello-m48ncx.o: In function `__llvm_gcov_writeout':
hello.c:(.text+0x65): undefined reference to `llvm_gcda_start_file'
hello.c:(.text+0x7b): undefined reference to `llvm_gcda_emit_function'
hello.c:(.text+0x8d): undefined reference to `llvm_gcda_emit_arcs'
hello.c:(.text+0x92): undefined reference to `llvm_gcda_end_file'
/tmp/hello-m48ncx.o: In function `__llvm_gcov_init':
hello.c:(.text+0xd5): undefined reference to `llvm_gcov_init'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
$ 
$ 
$ /opt/llvm/r181582/bin/clang --coverage -v hello.c
/opt/llvm/r181582/lib/clang/3.4/lib/linux/libclang_rt.profile-x86_64.a
clang version 3.4 (trunk 181582)
Target: x86_64-unknown-linux-gnu
Thread model: posix
 "/opt/llvm/r181582/bin/clang" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj
-mrelax-all -disable-free -main-file-name hello.c -mrelocation-model static
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -fuse-init-array -target-cpu x86-64 -target-linker-version
2.23.2 -v -femit-coverage-notes -femit-coverage-data -resource-dir
/opt/llvm/r181582/bin/../lib/clang/3.4 -internal-isystem /usr/local/include
-internal-isystem /opt/llvm/r181582/bin/../lib/clang/3.4/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-fdebug-compilation-dir /home/magnus/src/clang/coverage -ferror-limit 19
-fmessage-length 80 -mstackrealign -fobjc-runtime=gcc
-fobjc-default-synthesize-properties -fdiagnostics-show-option
-fcolor-diagnostics -backend-option -vectorize-loops -o /tmp/hello-JKAJNW.o -x
c hello.c
clang -cc1 version 3.4 based upon LLVM 3.4svn default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /opt/llvm/r181582/bin/../lib/clang/3.4/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
 "/usr/bin/ld" -z relro --hash-style=gnu --build-id --eh-frame-hdr -m
elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/4.7/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/4.7
-L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu
-L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../.. -L/lib -L/usr/lib
/tmp/hello-JKAJNW.o
/opt/llvm/r181582/lib/clang/3.4/lib/linux/libclang_rt.profile-x86_64.a -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/x86_64-linux-gnu/4.7/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crtn.o
/opt/llvm/r181582/bin/../lib/libprofile_rt.a
$ 
$ 
$ ./a.out 
Hello world
$ 
$ 
$ /opt/llvm/r181582/bin/clang -v -fsanitize=undefined hello.c clang version 3.4
(trunk 181582)
Target: x86_64-unknown-linux-gnu
Thread model: posix
 "/opt/llvm/r181582/bin/clang" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj
-mrelax-all -disable-free -main-file-name hello.c -mrelocation-model static
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -fuse-init-array -target-cpu x86-64 -target-linker-version
2.23.2 -v -resource-dir /opt/llvm/r181582/bin/../lib/clang/3.4
-internal-isystem /usr/local/include -internal-isystem
/opt/llvm/r181582/bin/../lib/clang/3.4/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -fdebug-compilation-dir
/home/magnus/src/clang/coverage -ferror-limit 19 -fmessage-length 80
-fsanitize=alignment,bool,bounds,enum,float-cast-overflow,float-divide-by-zero,integer-divide-by-zero,null,object-size,return,shift,signed-integer-overflow,unreachable,vla-bound,vptr
-mstackrealign -fobjc-runtime=gcc -fobjc-default-synthesize-properties
-fdiagnostics-show-option -fcolor-diagnostics -backend-option -vectorize-loops
-o /tmp/hello-rF6z0N.o -x c hello.c
clang -cc1 version 3.4 based upon LLVM 3.4svn default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /opt/llvm/r181582/bin/../lib/clang/3.4/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
 "/usr/bin/ld" -whole-archive
/opt/llvm/r181582/bin/../lib/clang/3.4/lib/linux/libclang_rt.san-x86_64.a
-no-whole-archive -z relro --hash-style=gnu --build-id --eh-frame-hdr -m
elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/4.7/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/4.7
-L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu
-L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../.. -L/lib -L/usr/lib
/tmp/hello-rF6z0N.o -lpthread -ldl -whole-archive
/opt/llvm/r181582/bin/../lib/clang/3.4/lib/linux/libclang_rt.ubsan-x86_64.a
-no-whole-archive -lpthread -ldl -export-dynamic -lgcc --as-needed -lgcc_s
--no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/x86_64-linux-gnu/4.7/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crtn.o
$ 
$ 
$ ./a.out 
Hello world
$

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