This script manually compiles a Go program with CGO (Go-C interoperability) by replicating the internal steps of the Go toolchain. It handles CGO preprocessing, compiles generated C files with Clang, links C objects, generates import stubs for Go-C bindings, compiles Go code, and finally links all components into an executable. Designed for debu…

cgo_manual_compile.sh

#!/bin/bash

# @author: jamlee
# date: 20250703
# platform: mac pro m3 

# 设置工作目录（模拟原始流程中的$WORK/b001）
rm -fr tmp
mkdir tmp
WORK_DIR=$(pwd)/tmp
printf "WORK_DIR: $WORK_DIR\n"
export CGO_LDFLAGS=''

# 步骤1: 使用cgo工具预处理Go文件（必须指定objdir）
go tool cgo -objdir $WORK_DIR -srcdir . ./main.go

# 步骤2: 编译cgo生成的C文件（保持原始参数）
clang -I $WORK_DIR -fPIC -arch arm64 -pthread \
      -fno-caret-diagnostics -Qunused-arguments \
      -fmessage-length=0 -gno-record-gcc-switches \
      -fno-common -O2 -g -c \
      $WORK_DIR/_cgo_export.c -o $WORK_DIR/_x001.o

clang -I $WORK_DIR -fPIC -arch arm64 -pthread \
      -fno-caret-diagnostics -Qunused-arguments \
      -fmessage-length=0 -gno-record-gcc-switches \
      -fno-common -O2 -g -c \
      $WORK_DIR/main.cgo2.c -o $WORK_DIR/_x002.o

clang -I $WORK_DIR -fPIC -arch arm64 -pthread \
      -fno-caret-diagnostics -Qunused-arguments \
      -fmessage-length=0 -gno-record-gcc-switches \
      -fno-common -O2 -g -c \
      $WORK_DIR/_cgo_main.c -o $WORK_DIR/_cgo_main.o

# 步骤3: 链接检查（原始流程的关键步骤）
clang -I $WORK_DIR -fPIC -arch arm64 -pthread \
      -fno-caret-diagnostics -Qunused-arguments \
      -fmessage-length=0 -gno-record-gcc-switches \
      -fno-common -O2 -g \
      -o $WORK_DIR/_cgo_.o \
      $WORK_DIR/_cgo_main.o $WORK_DIR/_x001.o $WORK_DIR/_x002.o

# 步骤4: 生成导入文件
go tool cgo -dynpackage main \
             -dynimport $WORK_DIR/_cgo_.o \
             -dynout $WORK_DIR/_cgo_import.go


# 关键修复：确保所有生成文件被正确包含
# 添加 _cgo_export.h 包含路径
export CGO_CFLAGS="-I$WORK_DIR"

# 步骤5: 编译Go部分（包含所有生成文件）
go tool compile -p main -o $WORK_DIR/main.a -pack \
      $WORK_DIR/_cgo_gotypes.go \
      $WORK_DIR/main.cgo1.go \
      $WORK_DIR/_cgo_import.go

# 步骤6: 将C对象打包进归档文件
go tool pack r $WORK_DIR/main.a \
   $WORK_DIR/_x001.o \
   $WORK_DIR/_x002.o

# 步骤7: 链接可执行文件（指定PIE构建模式）
go tool link -o main \
    -buildmode=pie \
    -extld=clang \
    $WORK_DIR/main.a