GCC SPEC 设计指导 ​

# 各架构支持的功能库
build_libquadmath   # x86/x86_64/PowerPC 支持
build_libasan       # 地址消毒器
build_libhwasan     # 硬件辅助地址消毒器
build_libtsan       # 线程消毒器
build_liblsan       # 内存泄漏消毒器
build_libubsan      # 未定义行为消毒器
build_libatomic     # 原子操作库
build_libitm        # 事务内存库

_scl_prefix   = gcc-toolset-14-
_scl_path     = /opt/openEuler/gcc-toolset-14
_scl_root     = /opt/openEuler/gcc-toolset-14/root
_prefix       = /opt/openEuler/gcc-toolset-14/root/usr

# SCL 模式条件
%if 0%{?scl:1}
  # SCL 特定配置
%else
  # 非 SCL 配置
%endif

# 架构特定条件
%ifarch x86_64
  # x86_64 特定配置
%endif

%ifarch aarch64
  # ARM64 特定配置
%endif

%ifarch riscv64
  # RISC-V 特定配置
%endif

# 核心功能补丁 (1000-1100)
Patch1001: GCC14-1001-libstdc++-compat.patch
Patch1002: GCC14-1002-change-gcc-version.patch
Patch1004: GCC14-1004-riscv-lib64.patch
Patch1005: GCC14-1005-libstdc-compat-Update-symbol-list-for-RISC-V-64.patch
Patch1006: GCC14-1006-Add-multi-version-lto-symbol-parse-cross-lto-units-i.patch
Patch1007: GCC14-1007-Add-hip09-machine-discribtion.patch

# RISC-V 支持补丁 (1008-1100)
Patch1008: 0001-RISC-V-Add-basic-Zaamo-and-Zalrsc-support.patch
Patch1009: 0002-RISC-V-Use-widening-shift-for-scatter-gather-if-appl.patch
...
Patch1100: 0093-RISC-V-Update-testsuite-to-use-b.patch

# x86 架构优化补丁 (1101-1121)
Patch1109: 0109-i386-Remove-CLDEMOTE-for-clients.patch
Patch1110: 0110-i386-Remove-KEYLOCKER-related-feature-since-Panther-.patch
...
Patch1121: 0121-i386-Support-C-template-parameters-in-AMX-intrinsics.patch

%prep
%autosetup -p1 -n gcc-14.3.0

%package -n %{?_scl_prefix}gcc-c++%{gcc_ver}
Summary: C++ support for GCC
Requires: %{?_scl_prefix}gcc%{gcc_ver} = %{version}-%{release}
Requires: %{?_scl_prefix}libstdc++%{gcc_ver} = %{version}-%{release}
Requires: %{?_scl_prefix}libstdc++%{gcc_ver}-devel = %{version}-%{release}
Provides: %{?_scl_prefix}gcc-g++%{gcc_ver} = %{version}-%{release}
Provides: %{?_scl_prefix}g++%{gcc_ver} = %{version}-%{release}
Autoreq: true

%description -n %{?_scl_prefix}gcc-c++%{gcc_ver}
This package adds C++ support to the GNU Compiler Collection
version 14.  It includes support for most of the current C++ specification
and a lot of support for the upcoming C++ specification.

%build
# 1. 环境准备
export CONFIG_SITE=NONE
CC=gcc
CXX=g++

# 2. 优化标志处理
OPT_FLAGS="%{optflags}"
# 移除不需要的优化标志
OPT_FLAGS=`echo $OPT_FLAGS|sed -e 's/-Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=[123]//g'`
...

# 3. 安全配置
OPT_FLAGS="$OPT_FLAGS -O2 -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong -fPIE -Wl,-z,relro,-z,now"

# 4. 创建构建目录
rm -rf obj-%{gcc_target_platform}
mkdir obj-%{gcc_target_platform}
cd obj-%{gcc_target_platform}

# 5. 配置选项
CONFIGURE_OPTS="\
    --prefix=%{_prefix} \
    --mandir=%{_mandir} \
    --infodir=%{_infodir} \
    --enable-shared \
    --enable-threads=posix \
    --enable-checking=release \
    ..."
    
# 6. 运行配置
../configure --disable-bootstrap --without-cloog \
    --enable-languages=c,c++,fortran${enablelobjc}${enablelada}${enablelgo}${enableld},lto \
    $CONFIGURE_OPTS

# 7. 编译
make %{?_smp_mflags} BOOT_CFLAGS="$OPT_FLAGS" LDFLAGS_FOR_TARGET=-Wl,-z,relro,-z,now

# 8. 构建 libgccjit (独立构建)
mkdir objlibgccjit
cd objlibgccjit
...

%install
# 1. 清理并创建构建根目录
rm -rf %{buildroot}
mkdir -p %{buildroot}

# 2. RISC-V 特殊处理 (lp64d ABI)
%ifarch riscv64
for d in %{buildroot}%{_libdir} ...; do
  mkdir -p $d
  (cd $d && ln -sf . lp64d)
done
%endif

# 3. 执行安装
cd obj-%{gcc_target_platform}
make prefix=%{buildroot}%{_prefix} mandir=%{buildroot}%{_mandir} \
  infodir=%{buildroot}%{_infodir} install

FULLPATH=%{buildroot}%{_prefix}/lib/gcc/%{gcc_target_platform}/%{gcc_major}
...

# 4. 库文件和链接处理
# 创建符号链接
ln -sf gcc %{buildroot}%{_prefix}/bin/cc
ln -sf gfortran %{buildroot}%{_prefix}/bin/f95
...

# 5. 头文件处理
# 处理多架构 c++config.h
...

# 6. 库脚本创建
# 创建 GNU ld 脚本
echo '/* GNU ld script */...' > libstdc++.so
...

# 7. 清理和优化
# 删除不必要的文件
rm -f ...

%files
# 主 gcc 包文件
%if 0%{?scl:1}
%{_scl_path}/enable
%{_prefix}/bin/sudo
%endif
%{_prefix}/bin/cc
%{_prefix}/bin/c89
%{_prefix}/bin/c99
%{_prefix}/bin/gcc
...
%doc gcc/README* rpm.doc/changelogs/gcc/ChangeLog* gcc/COPYING* COPYING.RUNTIME

%files -n %{?_scl_prefix}cpp%{gcc_ver}
%{_prefix}/lib/cpp
%{_prefix}/bin/cpp
%{_mandir}/man1/cpp.1*
...

# 安装后脚本 (post)
%post -n %{?_scl_prefix}libgcc%{gcc_ver} -p <lua>
if posix.access ("/sbin/ldconfig", "x") then
  local pid = posix.fork ()
  if pid == 0 then
    posix.exec ("/sbin/ldconfig")
  elseif pid ~= -1 then
    posix.wait (pid)
  end
end

# 卸载后脚本 (postun)
%postun -n %{?_scl_prefix}libgcc%{gcc_ver} -p <lua>
...

# ldconfig 脚本 (自动更新动态链接器缓存)
%ldconfig_scriptlets -n %{?_scl_prefix}libstdc++%{gcc_ver}-devel
%ldconfig_scriptlets -n %{?_scl_prefix}libobjc%{gcc_ver}
...

# 添加安全编译选项
OPT_FLAGS="$OPT_FLAGS -O2 -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong -fPIE"
OPT_LDFLAGS="$OPT_LDFLAGS -Wl,-z,relro,-z,now"

# 导出到编译环境
export FCFLAGS="$OPT_FLAGS"
CFLAGS="$OPT_FLAGS"
CXXFLAGS="..."
LDFLAGS="$OPT_LDFLAGS"