Messages in this thread Patch in this message | | | From | Dmitry Vyukov <> | Subject | [PATCH] Documentation: note that KCOV is supported since gcc 4.5 | Date | Tue, 13 Dec 2016 16:20:59 +0100 |
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Now that we have gcc plugins and in particular sancov plugin, KCOV can be used with gcc 4.5+. Note this in the docs.
I've tested CONFIG_KCOV with gcc 4.8.4 (stock for ubuntu 14.04) and it works. It even emits very comparable number of coverage callbacks: 420153 vs 422211 for gcc 7.0.
Cc: Jonathan Corbet <corbet@lwn.net> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Kees Cook <keescook@google.com> Cc: Vegard Nossum <vegard.nossum@oracle.com> Cc: linux-kernel@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: syzkaller@googlegroups.com Signed-off-by: Dmitry Vyukov <dvyukov@google.com> --- Documentation/dev-tools/kcov.rst | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/Documentation/dev-tools/kcov.rst b/Documentation/dev-tools/kcov.rst index 2c41b71..50d515a 100644 --- a/Documentation/dev-tools/kcov.rst +++ b/Documentation/dev-tools/kcov.rst @@ -19,7 +19,9 @@ Configure the kernel with:: CONFIG_KCOV=y -CONFIG_KCOV requires gcc built on revision 231296 or later. +CONFIG_KCOV is natively supported by gcc 6.0+ (revision 231296) via +-fsanitize-coverage=trace-pc flag. gcc 4.5+ supports CONFIG_KCOV with plugins +(see Documentation/gcc-plugins.txt and CONFIG_GCC_PLUGIN_SANCOV). Profiling data will only become accessible once debugfs has been mounted:: mount -t debugfs none /sys/kernel/debug -- 2.8.0.rc3.226.g39d4020
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