gen-zam: Establish the usual environment for cmake-driven builds

tools/gen-zam/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+project(Gen-ZAM C CXX)
+
+include(cmake/CommonCMakeConfig.cmake)
+
+include(FindRequiredPackage)
+
+include(RequireCXX17)
+
+set(GEN_ZAM_SRCS src/Gen-ZAM.cc)
+set(GEN_ZAM_HEADERS src/Gen-ZAM.h)
+add_executable(gen-zam ${GEN_ZAM_SRCS} ${GEN_ZAM_HEADERS})
+install(TARGETS gen-zam DESTINATION bin)
+
+if (CMAKE_BUILD_TYPE)
+    string(TOUPPER ${CMAKE_BUILD_TYPE} BuildType)
+endif ()
+
+message(
+    "\n===================|  Gen-ZAM Build Summary  |==================\n"
+    "\n"
+    "\nBuild type:        ${CMAKE_BUILD_TYPE}"
+    "\nBuild dir:         ${PROJECT_BINARY_DIR}"
+    "\nInstall prefix:    ${CMAKE_INSTALL_PREFIX}"
+    "\nDebug mode:        ${ENABLE_DEBUG}"
+    "\n"
+    "\nCC:                ${CMAKE_C_COMPILER}"
+    "\nCFLAGS:            ${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${BuildType}}"
+    "\nCXX:               ${CMAKE_CXX_COMPILER}"
+    "\nCXXFLAGS:          ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${BuildType}}"
+    "\nCPP:               ${CMAKE_CXX_COMPILER}"
+    "\n"
+    "\n================================================================\n"
+)
+
+include(UserChangedWarning)

tools/gen-zam/README.md

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+# Gen-ZAM, a templator for the Zeek Abstract Machine
+
+Zeek uses the `gen-zam` tool during its build, to synthesize operations in ZAM,
+the Zeek Abstract Machine. The main reason for why you might want to use this
+repository on its own is cross-compilation, for which you'll need `gen-zam` on
+the build host, much like `bifcl` and `binpac`.