Add -DOPENSSL_SMALL to CMake.
Adding preprocessor flags requires a lot of typing in the CMake
command-line (-DCMAKE_C_FLAGS=-DOPENSSL_SMALL
-DCMAKE_CXX_FLAGS=-DOPENSSL_SMALL).
Change-Id: Ieafc4155d656306c1f22746f780faa5c1d3e27be
Reviewed-on: https://boringssl-review.googlesource.com/26784
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/BUILDING.md b/BUILDING.md
index 46f27e3..19dbe01 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -150,7 +150,14 @@
Note that if a feature is enabled in this way, but not actually supported at
run-time, BoringSSL will likely crash.
-# Running tests
+## Binary Size
+
+The implementations of some algorithms require a trade-off between binary size
+and performance. For instance, BoringSSL's fastest P-256 implementation uses a
+148 KiB pre-computed table. To optimize instead for binary size, pass
+`-DOPENSSL_SMALL=1` to CMake or define the `OPENSSL_SMALL` preprocessor symbol.
+
+# Running Tests
There are two sets of tests: the C/C++ tests and the blackbox tests. For former
are built by Ninja and can be run from the top-level directory with `go run
