Search for system secp256k1 before vendoring

Builds/CMake/RippledInstall.cmake

@@ -4,7 +4,6 @@
 
 install (
   TARGETS
-    secp256k1
     ed25519-donna
     common
     opts
@@ -16,6 +15,18 @@ install (
   ARCHIVE DESTINATION lib
   RUNTIME DESTINATION bin
   INCLUDES DESTINATION include)
+
+if(${INSTALL_SECP256K1})
+install (
+  TARGETS
+    secp256k1
+  EXPORT RippleExports
+  LIBRARY DESTINATION lib
+  ARCHIVE DESTINATION lib
+  RUNTIME DESTINATION bin
+  INCLUDES DESTINATION include)
+endif()
+
 install (EXPORT RippleExports
   FILE RippleTargets.cmake
   NAMESPACE Ripple::

Builds/CMake/deps/Findsecp256k1.cmake

@@ -0,0 +1,22 @@
+find_package (PkgConfig REQUIRED)
+pkg_search_module (secp256k1_PC QUIET libsecp256k1)
+
+if(static)
+  set(SECP256K1_LIB libsecp256k1.a)
+else()
+  set(SECP256K1_LIB secp256k1)
+endif()
+
+find_library(secp256k1
+  NAMES ${SECP256K1_LIB}
+  HINTS
+    ${secp256k1_PC_LIBDIR}
+    ${secp256k1_PC_LIBRARY_PATHS}
+  NO_DEFAULT_PATH)
+
+find_path (SECP256K1_INCLUDE_DIR
+  NAMES secp256k1.h
+  HINTS
+    ${secp256k1_PC_INCLUDEDIR}
+    ${secp256k1_PC_INCLUDEDIRS}
+  NO_DEFAULT_PATH)

Builds/CMake/deps/Secp256k1.cmake

@@ -2,6 +2,28 @@
    NIH dep: secp256k1
 #]===================================================================]
 
+add_library (secp256k1_lib STATIC IMPORTED GLOBAL)
+
+if (NOT WIN32)
+  find_package(secp256k1)
+endif()
+
+
+if(secp256k1)
+  set_target_properties (secp256k1_lib PROPERTIES
+    IMPORTED_LOCATION_DEBUG
+      ${secp256k1}
+    IMPORTED_LOCATION_RELEASE
+      ${secp256k1}
+    INTERFACE_INCLUDE_DIRECTORIES
+      ${SECP256K1_INCLUDE_DIR})
+
+  add_library (secp256k1 ALIAS secp256k1_lib)
+  add_library (NIH::secp256k1 ALIAS secp256k1_lib)
+
+else()
+  set(INSTALL_SECP256K1 true)
+
   add_library (secp256k1 STATIC
     src/secp256k1/src/secp256k1.c)
   target_compile_definitions (secp256k1
@@ -24,7 +46,6 @@ target_compile_options (secp256k1
         -Wno-unused-function
       >
       $<$<BOOL:${is_gcc}>:-Wno-nonnull-compare>)
-add_library (NIH::secp256k1 ALIAS secp256k1)
   target_link_libraries (ripple_libs INTERFACE NIH::secp256k1)
 #[===========================[
      headers installation
@@ -33,3 +54,6 @@ install (
     FILES
       src/secp256k1/include/secp256k1.h
   DESTINATION include/secp256k1/include)
+
+  add_library (NIH::secp256k1 ALIAS secp256k1)
+endif()