cmake: Override build configurations for libsecp256k1

src/CMakeLists.txt

@@ -15,6 +15,15 @@ include(GetTargetInterface)
 get_target_interface(core_sanitizer_cxx_flags "" sanitize_interface COMPILE_OPTIONS)
 set(SECP256K1_LATE_CFLAGS ${core_sanitizer_cxx_flags} CACHE STRING "" FORCE)
 unset(core_sanitizer_cxx_flags)
+# We want to build libsecp256k1 with the most tested RelWithDebInfo configuration.
+enable_language(C)
+foreach(config IN LISTS CMAKE_BUILD_TYPE CMAKE_CONFIGURATION_TYPES)
+  if(config STREQUAL "")
+    continue()
+  endif()
+  string(TOUPPER "${config}" config)
+  set(CMAKE_C_FLAGS_${config} "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
+endforeach()
 add_subdirectory(secp256k1 EXCLUDE_FROM_ALL)
 set_target_properties(secp256k1 PROPERTIES EXPORT_COMPILE_COMMANDS OFF)
 string(APPEND CMAKE_C_COMPILE_OBJECT " ${APPEND_CPPFLAGS} ${APPEND_CFLAGS}")