Fix #6386 Extend documentation of configure-options

Author: mpilgrem

doc/build_command.md

@@ -168,7 +168,11 @@ part of Stack's [user's guide](GUIDE.md#the-stack-build-command) for information
 about how these dependencies get specified.
 
 In addition to specifying targets, you can also control what gets built, or
-retained, with the following flags:
+retained, with the flags and options listed below. You can also affect what gets
+built by specifying Cabal (the library) options for the configure step
+of the Cabal build process (for further information, see the documentation for
+the [configure-options](yaml_configuration.md#configure-options) configuration
+option).
 
 ### `--bench` flag
 

doc/yaml_configuration.md

@@ -807,10 +807,19 @@ configure-options:
   - /some/path
   $locals:
   - --happy-option=--ghc
+  $targets:
+  # Only works on platforms where GHC supports linking against shared Haskell
+  # libraries:
+  - --enable-executable-dynamic
   my-package:
   - --another-flag
 ~~~
 
+On platforms where GHC supports linking against shared Haskell libraries (that
+currently excludes Windows), Cabal's `--enable-executable-dynamic` flag (which
+implies `--enable-shared`, unless `--disable-shared` is specified) links
+dependent Haskell libraries into executables dynamically.
+
 ### connection-count
 
 Default: `8`