Add CMake options for more build granularity

This adds three new CMake options, all defaulting to true, making it
possible to opt-out of building parts of Vectorscan that are not
essential for deployment of the matching runtime.

These new options:

- `BUILD_UNIT`: control whether the `unit` directory is included
- `BUILD_DOC`: control whether the `doc` directory is included
- `BUILD_TOOLS`: control whether the `tools` directory is included

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d7e07a9aebc64805c1a5a3fb344348d081c27c20..c6952f41b52dd677d5a8acdc115bbb4e3eec78cf 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1221,11 +1221,17 @@ if (NOT BUILD_STATIC_LIBS)
 endif ()
 
 add_subdirectory(util)
-add_subdirectory(unit)
 
-if (EXISTS ${CMAKE_SOURCE_DIR}/tools/CMakeLists.txt)
+option(BUILD_UNIT "Build Hyperscan unit tests (default TRUE)" TRUE)
+if(BUILD_UNIT)
+    add_subdirectory(unit)
+endif()
+
+option(BUILD_TOOLS "Build Hyperscan tools (default TRUE)" TRUE)
+if(EXISTS ${CMAKE_SOURCE_DIR}/tools/CMakeLists.txt AND BUILD_TOOLS)
     add_subdirectory(tools)
 endif()
+
 if (EXISTS ${CMAKE_SOURCE_DIR}/chimera/CMakeLists.txt AND BUILD_CHIMERA)
     add_subdirectory(chimera)
 endif()
@@ -1240,4 +1246,7 @@ if(BUILD_BENCHMARKS)
     add_subdirectory(benchmarks)
 endif()
 
-add_subdirectory(doc/dev-reference)
+option(BUILD_DOC "Build the Hyperscan documentation (default TRUE)" TRUE)
+if(BUILD_DOC)
+    add_subdirectory(doc/dev-reference)
+endif()