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-rw-r--r--docs/markdown/Builtin-options.md4
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/markdown/Builtin-options.md b/docs/markdown/Builtin-options.md
index faf7a6088..ee07df46a 100644
--- a/docs/markdown/Builtin-options.md
+++ b/docs/markdown/Builtin-options.md
@@ -150,6 +150,10 @@ the two-way mapping:
All other combinations of `debug` and `optimization` set `buildtype` to `'custom'`.
+Note that `-Ddebug=false` does not cause the compiler preprocessor macro
+`NDEBUG` to be defined.
+The macro can be defined using the base option `b_ndebug`, described below.
+
#### Details for `warning_level`
Exact flags per warning level is compiler specific, but there is an approximate