chore: add shared libs and pkg-config support (#21)

Author: aduh95

CMakeLists.txt

@@ -3,37 +3,44 @@ project(ncrypto VERSION 1.0.1) # x-release-please-version
 
 include(CTest)
 include(GNUInstallDirs)
-include(FetchContent)
 include(cmake/ncrypto-flags.cmake)
 
 if (NOT CMAKE_BUILD_TYPE)
   message(STATUS "No build type selected, default to Release")
   set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build." FORCE)
 endif()
 
-include(cmake/CPM.cmake)
+if (NCRYPTO_SHARED_LIBS)
+  find_package(OpenSSL REQUIRED)
+else()
+  include(FetchContent)
+  include(cmake/CPM.cmake)
 
-CPMAddPackage(
+  CPMAddPackage(
     NAME boringssl
     VERSION 0.20250818.0
     GITHUB_REPOSITORY google/boringssl
     GIT_TAG 0.20250818.0
     OPTIONS "BUILD_SHARED_LIBS OFF" "BUILD_TESTING OFF"
-)
+  )
+endif()
+
 add_subdirectory(src)
 add_library(ncrypto::ncrypto ALIAS ncrypto)
 
-include_directories(${boringssl_SOURCE_DIR}/include)
-
 if (NCRYPTO_TESTING)
-  CPMAddPackage(
+  if (NCRYPTO_SHARED_LIBS)
+    find_package(GTest REQUIRED)
+  else()
+    CPMAddPackage(
       NAME GTest
       GITHUB_REPOSITORY google/googletest
       VERSION 1.15.2
       OPTIONS  "BUILD_GMOCK OFF" "INSTALL_GTEST OFF"
-  )
-  # For Windows: Prevent overriding the parent project's compiler/linker settings
-  set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+    )
+    # For Windows: Prevent overriding the parent project's compiler/linker settings
+    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+  endif()
   enable_testing()
   add_subdirectory(tests)
 endif()
@@ -53,3 +60,15 @@ install(
   ARCHIVE COMPONENT ncrypto_development
   INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
 )
+
+# Generate pkg-config file
+configure_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/ncrypto.pc.in
+  ${CMAKE_CURRENT_BINARY_DIR}/ncrypto.pc
+  @ONLY
+)
+
+install(
+  FILES ${CMAKE_CURRENT_BINARY_DIR}/ncrypto.pc
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
+)

cmake/ncrypto-flags.cmake

@@ -1,5 +1,6 @@
 option(NCRYPTO_DEVELOPMENT_CHECKS "development checks (useful for debugging)" OFF)
 option(NCRYPTO_TESTING "Build tests" ON)
+option(NCRYPTO_SHARED_LIBS "Build (and test) using shared library" OFF)
 option(NCRYPTO_BSSL_LIBDECREPIT_MISSING "enable if boringssl is built without libdecrepit" OFF)
 
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)

ncrypto.pc.in

@@ -0,0 +1,10 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+
+Name: ncrypto
+Description: crypto functions for node:crypto
+Version: @PROJECT_VERSION@
+Libs: -L${libdir} -lncrypto
+Cflags: -I${includedir}

src/CMakeLists.txt

@@ -1,12 +1,15 @@
 add_library(ncrypto ncrypto.cpp engine.cpp aead.cpp)
-target_link_libraries(ncrypto PUBLIC ssl crypto)
-
-if (NCRYPTO_BSSL_LIBDECREPIT_MISSING)
-    target_compile_definitions(ncrypto PUBLIC NCRYPTO_BSSL_LIBDECREPIT_MISSING=1)
+if (NCRYPTO_SHARED_LIBS)
+    target_link_libraries(ncrypto PUBLIC OpenSSL::SSL OpenSSL::Crypto)
 else()
-    target_link_libraries(ncrypto PUBLIC decrepit)
-endif()
+    target_link_libraries(ncrypto PUBLIC ssl crypto)
 
+    if (NCRYPTO_BSSL_LIBDECREPIT_MISSING)
+        target_compile_definitions(ncrypto PUBLIC NCRYPTO_BSSL_LIBDECREPIT_MISSING=1)
+    else()
+        target_link_libraries(ncrypto PUBLIC decrepit)
+    endif()
+endif()
 target_include_directories(ncrypto
     PUBLIC
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>