ThreadSanitizer linker flags
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Neven Sajko
Nov 17, 2014, 8:08:42 PM11/17/14
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Hi,
this would be the first time I use ThreadSanitizer!
When I try to build something with gcc 4.9.2 and tsan,
I get an error like this:
/usr/bin/cc -march=native -O2 -pipe -fstack-protector-strong
--param=ssp-buffer-size=4 -fpie -ggdb3 -fvar-tracking-assignments -Wall
-Wextra -fsanitize=thread -ggdb3 -fvar-tracking-assignments -Wall -Wextra
-fsanitize=thread -Wl,-pie
CMakeFiles/cmTryCompileExec1917069538.dir/testCCompiler.c.o -o
cmTryCompileExec1917069538 -rdynamic
cc: error: -fsanitize=thread linking must be done with -pie or -shared
Notice that the -pie option is given with -Wl.
But, when -pie option is given without -Wl, no error happens!
Could this be a bug?
this would be the first time I use ThreadSanitizer!
When I try to build something with gcc 4.9.2 and tsan,
I get an error like this:
/usr/bin/cc -march=native -O2 -pipe -fstack-protector-strong
--param=ssp-buffer-size=4 -fpie -ggdb3 -fvar-tracking-assignments -Wall
-Wextra -fsanitize=thread -ggdb3 -fvar-tracking-assignments -Wall -Wextra
-fsanitize=thread -Wl,-pie
CMakeFiles/cmTryCompileExec1917069538.dir/testCCompiler.c.o -o
cmTryCompileExec1917069538 -rdynamic
cc: error: -fsanitize=thread linking must be done with -pie or -shared
Notice that the -pie option is given with -Wl.
But, when -pie option is given without -Wl, no error happens!
Could this be a bug?
Alexey Samsonov
Nov 17, 2014, 8:30:42 PM11/17/14
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Hi,
I wouldn't call it a bug. GCC driver enforces that user explicitly passes "-pie" at link step. Otherwise, TSan wouldn't
work. Looks like GCC just doesn't respect -Wl flags, only passes them directly to linker.
Passing "-pie" to GCC instead of passing it directly to linker makes more sense - in this case GCC driver might
want to adjust all kinds of related flags (for instance, -ftls-model) accordingly. I think you should just do that.
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Alexey Samsonov, Mountain View, CA
Neven Sajko
Nov 17, 2014, 8:45:14 PM11/17/14
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OK Alexey,
Thank you!
On 18 November 2014 02:30, 'Alexey Samsonov' via thread-sanitizer
<thread-s...@googlegroups.com> wrote:
> Hi,
Thank you!
On 18 November 2014 02:30, 'Alexey Samsonov' via thread-sanitizer
<thread-s...@googlegroups.com> wrote:
> Hi,
>
> I wouldn't call it a bug. GCC driver enforces that user explicitly passes
> "-pie" at link step. Otherwise, TSan wouldn't
> work. Looks like GCC just doesn't respect -Wl flags, only passes them
> directly to linker.
>
> Passing "-pie" to GCC instead of passing it directly to linker makes more
> sense - in this case GCC driver might
> want to adjust all kinds of related flags (for instance, -ftls-model)
> accordingly. I think you should just do that.
>
>
>
> --
> I wouldn't call it a bug. GCC driver enforces that user explicitly passes
> "-pie" at link step. Otherwise, TSan wouldn't
> work. Looks like GCC just doesn't respect -Wl flags, only passes them
> directly to linker.
>
> Passing "-pie" to GCC instead of passing it directly to linker makes more
> sense - in this case GCC driver might
> want to adjust all kinds of related flags (for instance, -ftls-model)
> accordingly. I think you should just do that.
>
>
>
> --
> Alexey Samsonov, Mountain View, CA
>
> --
>
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