cc build: check that postgres and libpq versions don't diverge

commit_hash:4d2e31002a018e3693df1734d3d0272bbc1d0b70

cmake/ModuleHelpers.cmake

@@ -360,14 +360,16 @@ macro(_userver_module_end)
 endmacro()
 
 function(_userver_macos_set_default_dir variable command_args)
+  set(default_value "")
   if(CMAKE_SYSTEM_NAME MATCHES "Darwin" AND NOT DEFINED ${variable})
     execute_process(
         COMMAND ${command_args}
         OUTPUT_VARIABLE output
         OUTPUT_STRIP_TRAILING_WHITESPACE
     )
-    set("${variable}" "${output}" CACHE PATH "")
+    set(default_value "${output}")
   endif()
+  set("${variable}" "${default_value}" CACHE PATH "")
 endfunction()
 
 function(_userver_print_features_list)

cmake/install/userver-postgresql-config.cmake

@@ -8,13 +8,12 @@ find_package(userver REQUIRED COMPONENTS
     core
 )
 
-find_package(PostgreSQL REQUIRED)
-
 if(EXISTS "${USERVER_CMAKE_DIR}/SetupPostgresqlDeps.cmake")
   message(STATUS "libpq patch applied")
   include("${USERVER_CMAKE_DIR}/SetupPostgresqlDeps.cmake")
 else()
   message(STATUS "libpq patches disabled")
+  find_package(PostgreSQL REQUIRED)
 endif()
 
 include("${USERVER_CMAKE_DIR}/UserverSql.cmake")

cmake/install/userver-ydb-config.cmake

@@ -11,4 +11,6 @@ find_package(userver REQUIRED COMPONENTS
 
 # include("${USERVER_CMAKE_DIR}/ydb-cpp-sdk.cmake")
 
+include("${USERVER_CMAKE_DIR}/UserverSql.cmake")
+
 set(userver_ydb_FOUND TRUE)

postgresql/src/storages/postgres/detail/pg_connection_wrapper.cpp

@@ -36,6 +36,24 @@ auto PQXsendQueryPrepared(PGconn* conn, const char* stmtName, int nParams, const
 #include <userver/storages/postgres/io/traits.hpp>
 #include <userver/storages/postgres/message.hpp>
 
+#if !defined(USERVER_NO_LIBPQ_PATCHES)
+static_assert(
+    USERVER_LIBPQ_VERSION / 10000 == PG_VERSION_NUM / 10000,
+    "\n\n"
+    "======================================================================\n"
+    "Versions of postgres and libpq have diverged, check the output of cmake configure.\n"
+    "Either:\n"
+    "  a) set USERVER_FEATURE_PATCH_LIBPQ to OFF\n"
+    "     https://userver.tech/d5/d3d/md_en_2userver_2build_2options.html#cmake_options\n"
+    "  b) install libpq of the same version as postgres server\n"
+    "     and pass USERVER_PG_INCLUDE_DIR and USERVER_PG_LIBRARY_DIR cmake options to userver\n"
+    "     https://userver.tech/de/db9/md_en_2userver_2build_2dependencies.html#autotoc_md183\n"
+    "  c) build using the provided Docker containers or Conan\n"
+    "     https://userver.tech/de/dab/md_en_2userver_2build_2build.html#postgres_deps_versions\n"
+    "======================================================================\n"
+);
+#endif
+
 // NOLINTNEXTLINE(cppcoreguidelines-macro-usage): uses file/line info
 #define PGCW_LOG_TRACE() LOG_TRACE() << log_extra_
 // NOLINTNEXTLINE(cppcoreguidelines-macro-usage): uses file/line info

scripts/docs/en/userver/build/dependencies.md

@@ -252,9 +252,11 @@ Feel free to provide a PR with instructions for your favorite platform at https:
 If there's a strong need to build \b only the userver and run its tests, then see
 @ref scripts/docs/en/userver/build/userver.md
 
+@anchor postgres_deps_versions
 ## PostgreSQL versions
-If CMake option USERVER_FEATURE_PATCH_LIBPQ is on, then the same developer version of libpq, libpgport and libpgcommon libraries
-should be available on the system. If there are multiple versions of those libraries use `USERVER_PG_*` @ref cmake_options "CMake options"
+
+If CMake option `USERVER_FEATURE_PATCH_LIBPQ` is on, then the same developer version of libpq, libpgport and libpgcommon libraries
+should be available on the system. If there are multiple versions of those libraries, use `USERVER_PG_*` @ref cmake_options "CMake options"
 to aid the build system in finding the right version.
 
 You could also install any version of the above libraries by explicitly pinning the version. For example in Debian/Ubuntu pinning