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-rw-r--r--libstdc++-v3/docs/html/debug.html5
1 files changed, 5 insertions, 0 deletions
diff --git a/libstdc++-v3/docs/html/debug.html b/libstdc++-v3/docs/html/debug.html
index 09a1677239c..6013115fe13 100644
--- a/libstdc++-v3/docs/html/debug.html
+++ b/libstdc++-v3/docs/html/debug.html
@@ -136,6 +136,11 @@
instantiation of a container is passed between the two translation
units.</p>
+<p>By default, error messages are formatted to fit on lines of about
+ 78 characters. The environment variable
+ <code>GLIBCXX_DEBUG_MESSAGE_LENGTH</code> can be used to request a
+ different length.</p>
+
<p>For information about the design of the libstdc++ debug mode,
please see the <a href="debug_mode.html">libstdc++ debug mode design
document</a>.</p>
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