Fix __FILE__ expansion bug (#164)

Author: tsayukov

.github/actions/build/action.yaml

@@ -9,7 +9,7 @@ runs:
       run: |
         mkdir -p ../build
         rm -rf ../build/*
-        cmake -DYDB_SDK_TESTS=On -DYDB_SDK_EXAMPLES=On --preset release
+        cmake -DYDB_SDK_TESTS=On -DYDB_SDK_EXAMPLES=On -DARCADIA_ROOT="../ydb-cpp-sdk" -DARCADIA_BUILD_ROOT="." --preset release
     - name: Build
       shell: bash
       run: |

CMakeLists.txt

@@ -18,6 +18,18 @@ set(YDB-CPP-SDK_AVAILABLE_COMPONENTS "" CACHE INTERNAL "")
 set(YDB-CPP-SDK_COMPONENT_TARGETS "" CACHE INTERNAL "")
 file(READ "src/client/resources/ydb_sdk_version.txt" YDB_SDK_VERSION)
 
+#[=============================================================================[
+  NOTE: if `ccache` is used with the environment variable `CCACHE_BASEDIR`,
+  these cached variable should be set manually by passing them to `cmake` as
+  `-DARCADIA_ROOT=source/path/relative/to/build/dir` and
+  `-DARCADIA_BUILD_ROOT=.`, because in that case the macro `__FILE__` will be
+  expanded to a relative path, even if the source code file was specified as
+  an absolute path, and we have to know the proper prefix of that path.
+  See details: https://ccache.dev/manual/3.1.html#_compiling_in_different_directories
+#]=============================================================================]
+set(ARCADIA_ROOT ${YDB_SDK_SOURCE_DIR} CACHE PATH "The source root directory")
+set(ARCADIA_BUILD_ROOT ${YDB_SDK_BINARY_DIR} CACHE PATH "The build root directory")
+
 include(GNUInstallDirs)
 include(CMakePackageConfigHelpers)
 

util/CMakeLists.txt

@@ -701,10 +701,10 @@ elseif (WIN32 AND CMAKE_SYSTEM_PROCESSOR STREQUAL "AMD64")
   )
 endif()
 
-# These definitions are needed to `util/system/src_root.h` works properly
+# NOTE: these definitions are needed to `util/system/src_root.h` works properly
 target_compile_definitions(yutil PUBLIC
-  ARCADIA_ROOT=${YDB_SDK_SOURCE_DIR}
-  ARCADIA_BUILD_ROOT=${YDB_SDK_BINARY_DIR}
+  ARCADIA_ROOT=${ARCADIA_ROOT}
+  ARCADIA_BUILD_ROOT=${ARCADIA_BUILD_ROOT}
 )
 
 _ydb_sdk_install_targets(TARGETS yutil)