feat: add toolchain environment collection to bazel

Author: GuillaumeLagrange

core/BUILD

@@ -68,6 +68,58 @@ cc_library(
 )
 
 
+# Generate a header with C++ toolchain information
+genrule(
+    name = "toolchain_info_gen",
+    outs = ["toolchain_info.h"],
+    cmd = """
+set -e
+COMPILER="$(CC)"
+FULL_VERSION=$$($$COMPILER --version 2>/dev/null | head -n1) || FULL_VERSION="unknown"
+
+COMPILER_ID="unknown"
+COMPILER_VERSION="unknown"
+
+if echo "$$FULL_VERSION" | grep -qi "clang"; then
+    COMPILER_ID="Clang"
+    COMPILER_VERSION=$$(echo "$$FULL_VERSION" | grep -oP '\\d+\\.\\d+\\.\\d+' | head -n1) || COMPILER_VERSION="unknown"
+elif echo "$$FULL_VERSION" | grep -qi "gcc\\|g++\\|GNU"; then
+    COMPILER_ID="GNU"
+    COMPILER_VERSION=$$(echo "$$FULL_VERSION" | grep -oP '\\d+\\.\\d+\\.\\d+' | head -n1) || COMPILER_VERSION="unknown"
+elif echo "$$FULL_VERSION" | grep -qi "MSVC\\|Microsoft"; then
+    COMPILER_ID="MSVC"
+    COMPILER_VERSION=$$(echo "$$FULL_VERSION" | grep -oP '\\d+\\.\\d+\\.\\d+' | head -n1) || COMPILER_VERSION="unknown"
+fi
+
+case "$(COMPILATION_MODE)" in
+    opt)       BUILD_TYPE="Release" ;;
+    dbg)       BUILD_TYPE="Debug" ;;
+    fastbuild) BUILD_TYPE="FastBuild" ;;
+    *)         BUILD_TYPE="$(COMPILATION_MODE)" ;;
+esac
+
+cat > $@ << HEADER_EOF
+// Auto-generated by Bazel - do not edit
+#ifndef CODSPEED_TOOLCHAIN_INFO_H
+#define CODSPEED_TOOLCHAIN_INFO_H
+
+#define CODSPEED_CXX_COMPILER_ID "$$COMPILER_ID"
+#define CODSPEED_CXX_COMPILER_VERSION "$$COMPILER_VERSION"
+#define CODSPEED_CXX_COMPILER_FULL_VERSION "$$FULL_VERSION"
+#define CODSPEED_BUILD_TYPE "$$BUILD_TYPE"
+
+#endif  // CODSPEED_TOOLCHAIN_INFO_H
+HEADER_EOF
+""",
+    toolchains = ["@bazel_tools//tools/cpp:current_cc_toolchain"],
+)
+
+cc_library(
+    name = "toolchain_info",
+    hdrs = [":toolchain_info_gen"],
+    includes = ["."],
+)
+
 # Define the codspeed library
 cc_library(
     name = "codspeed",
@@ -87,7 +139,7 @@ cc_library(
         ":walltime_mode": ["CODSPEED_ENABLED", "CODSPEED_WALLTIME", "CODSPEED_MODE_DISPLAY=\\\"walltime\\\""],
         "//conditions:default": [],
     }),
-    deps = [":instrument_hooks"],
+    deps = [":instrument_hooks", ":toolchain_info"],
     visibility = ["//visibility:public"],
 )
 

core/src/codspeed.cpp

@@ -4,6 +4,10 @@
 #include <string>
 #include <vector>
 
+#if __has_include("toolchain_info.h")
+#include "toolchain_info.h"
+#endif
+
 #include "measurement.hpp"
 
 namespace codspeed {