bazelbuild · kekxv · Nov 30, 2025
@@ -69,6 +69,7 @@ filegroup(
 filegroup(
     name = "multicall_support_files",
     srcs = glob([
+        "bin/**",
         "libexec/**/*",
     ]),
 )

@@ -17,6 +17,17 @@ load("@rules_cc//cc/toolchains:tool_map.bzl", "cc_tool_map")
 
 licenses(["notice"])
 
+exports_files([
+    "wrapper/ld.sh",
+])
+
+filegroup(
+    name = "toolchain_wrapper",
+    srcs = [
+        "wrapper/ld.sh",
+    ],
+)
+
 cc_tool_map(
     name = "all_tools",
     tags = ["manual"],
@@ -61,11 +72,13 @@ cc_tool(
 cc_tool(
     name = "ld",
     src = select({
-        "//constraint:linux_x86_64": "@gcc-linux-x86_64//:bin/x86_64-linux-g++.br_real",
+        # "//constraint:linux_x86_64": "@gcc-linux-x86_64//:bin/x86_64-linux-g++.br_real",
+        "//constraint:linux_x86_64": ":wrapper/ld.sh",
     }),
     data = [
         ":exec_platform_linker_builtins",
         ":exec_platform_multicall_support_files",
+        ":toolchain_wrapper",
     ],
     tags = ["manual"],
 )

@@ -0,0 +1,135 @@
+#!/bin/bash
+
+# ==============================================================================
+# 动态查找 GCC 并实时修复 Sysroot 路径问题的 Wrapper
+# Wrapper to dynamically find GCC and fix Sysroot path issues on the fly.
+# ==============================================================================
+
+# 1. 获取当前工作目录 (Bazel execroot)
+#    Get current working directory (Bazel execroot).
+REPO_ROOT=$(pwd)
+
+# 2. 动态查找 GCC 编译器
+#    Dynamically locate the GCC compiler.
+#    We limit the search to the 'external/' directory to avoid scanning the whole source tree.
+#    我们限制查找范围在 external/ 目录下，避免扫描整个源码树。
+GCC_NAME="x86_64-linux-g++.br_real"
+LD_NAME="x86_64-linux-ld"
+
+REL_GCC_PATH=$(find -L external -name "${GCC_NAME}" -prune -type f -print -quit)
+
+if [[ -z "${REL_GCC_PATH}" ]]; then
+    echo "ERROR: [ld.sh] Could not find ${GCC_NAME} in external/" >&2
+    exit 1
+fi
+
+REAL_GCC="${REPO_ROOT}/${REL_GCC_PATH}"
+TOOL_DIR=$(dirname "${REAL_GCC}")
+REAL_LD="${TOOL_DIR}/${LD_NAME}"
+
+# 检查 LD 是否存在
+# Check if the linker (LD) exists.
+if [[ ! -f "${REAL_LD}" ]]; then
+    echo "ERROR: [ld.sh] Found GCC at ${REAL_GCC} but LD not found at ${REAL_LD}" >&2
+    exit 1
+fi
+
+# 3. 创建临时工作目录
+#    Create temporary working directories.
+TEMP_DIR=$(mktemp -d)
+TEMP_BIN_DIR="${TEMP_DIR}/bin"
+mkdir -p "${TEMP_BIN_DIR}"
+
+# 建立 'ld' 软链接欺骗 GCC
+# Create a symlink named 'ld' to trick GCC.
+# GCC calls 'ld' based on the directory specified by -B.
+ln -sf "${REAL_LD}" "${TEMP_BIN_DIR}/ld"
+
+# ==============================================================================
+# 修复逻辑：处理 libm.so / libc.so 中的绝对路径
+# Fix Logic: Handle absolute paths in libm.so / libc.so.
+# ==============================================================================
+
+# 4.1 解析参数找到 sysroot 路径
+#     Parse arguments to find the sysroot path.
+SYSROOT_PATH=""
+for arg in "$@"; do
+    if [[ "$arg" == --sysroot=* ]]; then
+        SYSROOT_PATH="${arg#*=}"
+        break
+    fi
+done
+
+# 存放修复后库文件的目录
+# Directory to store fixed library files.
+FIXED_LIB_DIR="${TEMP_DIR}/fixed_lib"
+mkdir -p "${FIXED_LIB_DIR}"
+
+# 4.2 定义修复函数
+#     Define the fix function.
+fix_linker_script() {
+    local src_file="$1"
+
+    # 只有文件存在时才处理
+    # Process only if the file exists.
+    if [[ -f "${src_file}" ]]; then
+        local file_name=$(basename "$src_file")
+        local dst_file="${FIXED_LIB_DIR}/${file_name}"
+
+        # 复制文件到临时目录 (避免修改只读的源文件)
+        # Copy file to temp dir (avoid modifying read-only source files).
+        cp "${src_file}" "${dst_file}"
+        chmod +w "${dst_file}"
+
+        # === 关键修正：按顺序替换路径 ===
+        # === Critical Fix: Replace paths in specific order ===
+
+        # 1. 先替换最长的路径前缀 (/usr/lib64/ 和 /usr/lib/)
+        #    这样可以避免把 /usr/lib/xxx 错误地变成 /usrlib/xxx 或 /usrxxx
+        # 1. Replace longest path prefixes first (/usr/lib64/ and /usr/lib/).
+        #    This prevents corrupting paths like /usr/lib/xxx into /usrlib/xxx.
+        sed -i 's|/usr/lib64/||g' "${dst_file}"
+        sed -i 's|/usr/lib/||g' "${dst_file}"
+
+        # 2. 再替换短的路径前缀 (/lib64/ 和 /lib/)
+        # 2. Then replace shorter path prefixes (/lib64/ and /lib/).
+        sed -i 's|/lib64/||g' "${dst_file}"
+        sed -i 's|/lib/||g' "${dst_file}"
+    fi
+}
+
+if [[ -n "${SYSROOT_PATH}" ]]; then
+    # 尝试修复 libm.so (数学库)
+    # Attempt to fix libm.so (Math library).
+    fix_linker_script "${SYSROOT_PATH}/usr/lib/libm.so"
+    fix_linker_script "${SYSROOT_PATH}/lib/libm.so"
+    fix_linker_script "${SYSROOT_PATH}/usr/lib64/libm.so"
+
+    # 尝试修复 libc.so (C 标准库)
+    # Attempt to fix libc.so (C Standard library).
+    fix_linker_script "${SYSROOT_PATH}/usr/lib/libc.so"
+    fix_linker_script "${SYSROOT_PATH}/lib/libc.so"
+    fix_linker_script "${SYSROOT_PATH}/usr/lib64/libc.so"
+fi
+
+# ==============================================================================
+# 5. 调用 GCC 进行链接
+#    Invoke GCC to perform linking.
+# ==============================================================================
+
+EXTRA_ARGS=()
+
+# 如果有修复后的库，将该目录加入搜索路径 (-L)
+# If fixed libraries exist, add their directory to the search path (-L).
+if [[ -d "${FIXED_LIB_DIR}" ]]; then
+    EXTRA_ARGS+=("-L${FIXED_LIB_DIR}")
+fi
+
+# -no-canonical-prefixes: 防止 GCC 将路径展开为绝对路径
+# -no-canonical-prefixes: Prevents GCC from resolving paths to absolute paths.
+# -B: 指向包含 'ld' 软链接的目录 / Points to the dir containing the 'ld' symlink.
+exec "${REAL_GCC}" \
+    -no-canonical-prefixes \
+    -B "${TEMP_BIN_DIR}" \
+    "${EXTRA_ARGS[@]}" \
+    "$@"