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| author | Peter Collingbourne <peter@pcc.me.uk> | 2013-04-09 04:35:11 +0000 |
|---|---|---|
| committer | Peter Collingbourne <peter@pcc.me.uk> | 2013-04-09 04:35:11 +0000 |
| commit | 54d770cb1fedf23466eb75e7f34fa561e8d63d23 (patch) | |
| tree | a1e95e1c4200129e7d038a54da1ab6e80da42f41 /clang/docs/MemorySanitizer.rst | |
| parent | 61e221f68de5b7b32cea552e3b4ef7838eb2182c (diff) | |
| download | bcm5719-llvm-54d770cb1fedf23466eb75e7f34fa561e8d63d23.tar.gz bcm5719-llvm-54d770cb1fedf23466eb75e7f34fa561e8d63d23.zip | |
If the user requested a zero-base-shadow sanitizer, infer -pie and -fPIC when appropriate.
Differential Revision: http://llvm-reviews.chandlerc.com/D502
llvm-svn: 179082
Diffstat (limited to 'clang/docs/MemorySanitizer.rst')
| -rw-r--r-- | clang/docs/MemorySanitizer.rst | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/clang/docs/MemorySanitizer.rst b/clang/docs/MemorySanitizer.rst index fdb8a810232..439acc47fa2 100644 --- a/clang/docs/MemorySanitizer.rst +++ b/clang/docs/MemorySanitizer.rst @@ -46,7 +46,7 @@ to disable inlining (just use ``-O1``) and tail call elimination return 0; } - % clang -fsanitize=memory -fPIE -pie -fno-omit-frame-pointer -g -O2 umr.cc + % clang -fsanitize=memory -fno-omit-frame-pointer -g -O2 umr.cc If a bug is detected, the program will print an error message to stderr and exit with a non-zero exit code. Currently, MemorySanitizer @@ -103,7 +103,7 @@ the example above, .. code-block:: console - % clang -fsanitize=memory -fsanitize-memory-track-origins -fPIE -pie -fno-omit-frame-pointer -g -O2 umr.cc + % clang -fsanitize=memory -fsanitize-memory-track-origins -fno-omit-frame-pointer -g -O2 umr.cc % ./a.out 2>log % projects/compiler-rt/lib/asan/scripts/asan_symbolize.py / < log | c++filt ==14425== WARNING: MemorySanitizer: UMR (uninitialized-memory-read) @@ -160,7 +160,10 @@ Limitations address space. This means that tools like ``ulimit`` may not work as usually expected. * Static linking is not supported. -* Non-position-independent executables are not supported. +* Non-position-independent executables are not supported. Therefore, the + ``fsanitize=memory`` flag will cause Clang to act as though the ``-fPIE`` + flag had been supplied if compiling without ``-fPIC``, and as though the + ``-pie`` flag had been supplied if linking an executable. * Depending on the version of Linux kernel, running without ASLR may be not supported. Note that GDB disables ASLR by default. To debug instrumented programs, use "set disable-randomization off". |
