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doc: improve -fsanitize=undefined description

Message ID 81A13911-15A6-4410-97EB-63F30807A764@oracle.com
State New
Headers show
Series doc: improve -fsanitize=undefined description | expand

Commit Message

Diane Meirowitz Sept. 15, 2021, 9:03 p.m. UTC
doc: improve -fsanitize=undefined description

    gcc/ChangeLog:
            * doc/invoke.texi: add link to UndefinedBehaviorSanitizer documentation,
            mention UBSAN_OPTIONS, similar to what is done for AddressSanitizer.
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Patch

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 78cfc100ac2..f022885edf8 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -15200,7 +15200,8 @@  The option cannot be combined with @option{-fsanitize=thread}.
@opindex fsanitize=undefined
Enable UndefinedBehaviorSanitizer, a fast undefined behavior detector.
Various computations are instrumented to detect undefined behavior
-at runtime.  Current suboptions are:
+at runtime.  See @uref{https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html} for more details.   The run-time behavior can be influenced using the
+@env{UBSAN_OPTIONS} environment variable.  Current suboptions are:

@table @gcctabopt