BUILDING.md: fix description about static builds

AkihiroSuda · thaJeztah · commit 086e859d2172 · 2020-09-11T09:44:52.000+02:00
* `-linkmode external` is required since Go 1.15 for static builds: golang/go#40711 * Clarify the meaning of "loading plugins" Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp> (cherry picked from commit 43cbdf8) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
diff --git a/BUILDING.md b/BUILDING.md
@@ -117,13 +117,13 @@ You can build static binaries by providing a few variables to `make`:
 
 ```sudo
 make EXTRA_FLAGS="-buildmode pie" \
-	EXTRA_LDFLAGS='-extldflags "-fno-PIC -static"' \
+	EXTRA_LDFLAGS='-linkmode external -extldflags "-fno-PIC -static"' \
 	BUILDTAGS="netgo osusergo static_build"
 ```
 
 > *Note*:
 > - static build is discouraged
-> - static containerd binary does not support loading plugins
+> - static containerd binary does not support loading shared object plugins (`*.so`)
 
 # Via Docker container
 
