feat(google_benchmark): add file name to benchmark URI

Author: GuillaumeLagrange

google_benchmark/cmake/Codspeed.cmake

@@ -1,4 +1,27 @@
-# Step 1: Check if CODSPEED_MODE is set via the command line
+add_subdirectory(${PROJECT_SOURCE_DIR}/../core codspeed)
+
+execute_process(
+    COMMAND git rev-parse --show-toplevel
+    OUTPUT_VARIABLE GIT_ROOT_DIR
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    RESULT_VARIABLE GIT_COMMAND_RESULT
+)
+
+if(NOT GIT_COMMAND_RESULT EQUAL 0)
+    message(
+        WARNING
+        "Failed to determine the git root directory.\
+        Check that git is in your PATH, and that you are in a git repository.\
+        Continuing, but codspeed features will not be useable"
+    )
+    # Default to user's cmake source directory
+    set(GIT_ROOT_DIR ${CMAKE_SOURCE_DIR})
+endif()
+
+target_compile_definitions(
+    codspeed
+    INTERFACE -DCODSPEED_GIT_ROOT_DIR="${GIT_ROOT_DIR}"
+)
 
 if(DEFINED CODSPEED_MODE)
     # Define a preprocessor macro based on the build mode

google_benchmark/include/benchmark/benchmark.h

@@ -171,6 +171,7 @@ BENCHMARK(BM_test)->Unit(benchmark::kMillisecond);
 #include <cstddef>
 #include <initializer_list>
 #include <iosfwd>
+#include <iostream>
 #include <limits>
 #include <map>
 #include <memory>
@@ -1437,11 +1438,23 @@ class Fixture : public internal::Benchmark {
   static ::benchmark::internal::Benchmark const* const BENCHMARK_PRIVATE_NAME( \
       n) [[maybe_unused]]
 
+#ifdef CODSPEED_INSTRUMENTATION
+#include <filesystem>
+#define BENCHMARK(...)                                                   \
+  BENCHMARK_PRIVATE_DECLARE(_benchmark_) =                               \
+      (::benchmark::internal::RegisterBenchmarkInternal(                 \
+          std::make_unique<::benchmark::internal::FunctionBenchmark>(    \
+              std::filesystem::relative(__FILE__, CODSPEED_GIT_ROOT_DIR) \
+                      .string() +                                        \
+                  "::" + #__VA_ARGS__,                                   \
+              __VA_ARGS__)))
+#else
 #define BENCHMARK(...)                                                \
   BENCHMARK_PRIVATE_DECLARE(_benchmark_) =                            \
       (::benchmark::internal::RegisterBenchmarkInternal(              \
           std::make_unique<::benchmark::internal::FunctionBenchmark>( \
               #__VA_ARGS__, __VA_ARGS__)))
+#endif
 
 // Old-style macros
 #define BENCHMARK_WITH_ARG(n, a) BENCHMARK(n)->Arg((a))