cmake: Build `secp256k1` subtree

src/CMakeLists.txt

@@ -4,3 +4,28 @@
 
 configure_file(${PROJECT_SOURCE_DIR}/cmake/bitcoin-config.h.in config/bitcoin-config.h @ONLY)
 include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
+
+#=============================
+# secp256k1 subtree
+#=============================
+message("")
+message("Configuring secp256k1 subtree...")
+set(SECP256K1_DISABLE_SHARED ON CACHE BOOL "" FORCE)
+set(SECP256K1_ENABLE_MODULE_ECDH OFF CACHE BOOL "" FORCE)
+set(SECP256K1_ENABLE_MODULE_RECOVERY ON CACHE BOOL "" FORCE)
+set(SECP256K1_BUILD_BENCHMARK OFF CACHE BOOL "" FORCE)
+set(SECP256K1_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+set(SECP256K1_BUILD_EXHAUSTIVE_TESTS OFF CACHE BOOL "" FORCE)
+set(SECP256K1_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
+# We want to build libsecp256k1 with the most tested RelWithDebInfo configuration.
+enable_language(C)
+foreach(config IN LISTS CMAKE_BUILD_TYPE CMAKE_CONFIGURATION_TYPES)
+  if(config STREQUAL "")
+    continue()
+  endif()
+  string(TOUPPER "${config}" config)
+  set(CMAKE_C_FLAGS_${config} "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
+endforeach()
+set(CMAKE_EXPORT_COMPILE_COMMANDS OFF)
+add_subdirectory(secp256k1)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)