Add --enable-ubsan

[thirdparty/binutils-gdb.git] / gdb / README

diff --git a/gdb/README b/gdb/README
index 5881be23af804da6a4807288fdcfacee330f11d4..69ba0eb8dfe078bafba950a08dd4583de7cdaf6f 100644 (file)
--- a/gdb/README
+++ b/gdb/README
@@ -538,6 +538,13 @@ more obscure GDB `configure' options are not listed here.
      the compiler, which will fail the compilation if the compiler
      outputs any warning messages.
 
+`--enable-ubsan'
+     Enable the GCC undefined behavior sanitizer.  By default this is
+     disabled in GDB releases, but enabled when building from git.
+     The undefined behavior sanitizer checks for C++ undefined
+     behavior.  It has a performance cost, so if you are looking at
+     GDB's performance, you should disable it.
+
 `configure' accepts other options, for compatibility with configuring
 other GNU tools recursively.