为什么我会收到 cc1plus: error: unrecognized command line option “-arch”？
/usr/bin/make -f nbproject/Makefile-Debug.mk SUBPROJECTS= .build-conf
/usr/bin/make -f nbproject/Makefile-Debug.mk dist/Debug/GNU-MacOSX/cppapplication_1
mkdir -p build/Debug/GNU-MacOSX
rm -f build/Debug/GNU-MacOSX/main.o.d
g++ -arch i386 -c -g -MMD -MP -MF build/Debug/GNU-MacOSX/main.o.d -o build/Debug/GNU-MacOSX/main.o main.cpp
cc1plus: error: unrecognized command line option "-arch"
make[2]: *** [build/Debug/GNU-MacOSX/main.o] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2
BUILD FAILED (exit value 2, total time: 311ms)
simpatico$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin10/4.5.1/lto-wrapper
Target: x86_64-apple-darwin10
Configured with: ../gcc-4.5.1/configure --prefix=/opt/local --build=x86_64-apple-darwin10 --enable-languages=c,c++,objc,obj-c++,fortran,java --libdir=/opt/local/lib/gcc45 --includedir=/opt/local/include/gcc45 --infodir=/opt/local/share/info --mandir=/opt/local/share/man --datarootdir=/opt/local/share/gcc-4.5 --with-local-prefix=/opt/local --with-system-zlib --disable-nls --program-suffix=-mp-4.5 --with-gxx-include-dir=/opt/local/include/gcc45/c++/ --with-gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local --enable-stage1-checking --disable-multilib --enable-fully-dynamic-string
Thread model: posix
gcc version 4.5.1 (GCC)
这个简单的文件：
#include <stdlib.h>
int main(int argc, char** argv) {
return (EXIT_SUCCESS);
}
/usr/bin/make -f nbproject/Makefile-Debug.mk SUBPROJECTS= .build-conf
/usr/bin/make -f nbproject/Makefile-Debug.mk dist/Debug/GNU-MacOSX/cppapplication_1
mkdir -p build/Debug/GNU-MacOSX
rm -f build/Debug/GNU-MacOSX/main.o.d
g++ -arch i386 -c -g -MMD -MP -MF build/Debug/GNU-MacOSX/main.o.d -o build/Debug/GNU-MacOSX/main.o main.cpp
cc1plus: error: unrecognized command line option "-arch"
make[2]: *** [build/Debug/GNU-MacOSX/main.o] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2
BUILD FAILED (exit value 2, total time: 311ms)
simpatico$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin10/4.5.1/lto-wrapper
Target: x86_64-apple-darwin10
Configured with: ../gcc-4.5.1/configure --prefix=/opt/local --build=x86_64-apple-darwin10 --enable-languages=c,c++,objc,obj-c++,fortran,java --libdir=/opt/local/lib/gcc45 --includedir=/opt/local/include/gcc45 --infodir=/opt/local/share/info --mandir=/opt/local/share/man --datarootdir=/opt/local/share/gcc-4.5 --with-local-prefix=/opt/local --with-system-zlib --disable-nls --program-suffix=-mp-4.5 --with-gxx-include-dir=/opt/local/include/gcc45/c++/ --with-gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local --enable-stage1-checking --disable-multilib --enable-fully-dynamic-string
Thread model: posix
gcc version 4.5.1 (GCC)
This simple of a file:
#include <stdlib.h>
int main(int argc, char** argv) {
return (EXIT_SUCCESS);
}
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-arch选项是 Apple 对gcc扩展的一部分。您需要使用 Apple 开发工具Xcode提供的gcc。The
-archoption is part of the Apple extensions togcc. You need to use thegccsupplied by Apple's Developer Tools,Xcode.-arch选项仅存在于 Apple 提供的gcc版本中。更改CFLAGS（可能通过您的环境、makefile 或配置选项设置），使其使用-march或-m32代替。例如：区别似乎在于您可以指定多个
-arch选项来生成通用二进制文件，而-march一次只能生成一个。The
-archoption is only in the Apple-provided version ofgcc. ChangeCFLAGS(which might be set via your environment, your makefile, or your configure options) so it uses-marchor-m32instead. For example:The difference seems to be that you can specify multiple
-archoptions to generate universal binaries, whereas-marchonly generates one at a time.无论机器或构建类型如何，此错误都以多种形式存在。
一般来说，解决方案是更改 PATH 和 CROSS_COMPILE 变量以包含正确的交叉编译器。
This error exists in many forms, regardless of the machine or build type.
The solution, in general, is to change the PATH and CROSS_COMPILE variables to include the correct cross compiler.
GCC 的 macports 版本不支持 -arch 标志。事实证明，Apple 的 GCC 是真正的 gcc 的包装器，它在调用真正的编译器之前遵循一些特殊的标志。 -arch 标志是这些标志之一。它为每个指定的架构调用适当的编译器，然后使用 lipo 将所有目标文件重新组合成一个“胖”目标文件。
我只是花了一点时间让这个 Apple GCC 包装器与 macports GCC 一起工作。如果您想要详细信息，可以在这里找到：
http://thecoderslife.blogspot.com/2015/07/building-with-gcc-46-and-xcode-4.html
The macports version of GCC doesn't support the -arch flag. As it turns out Apple's GCC is a wrapper around the real gcc that honors a few special flags before calling the real compiler. The -arch flag is one of these flags. It calls the appropriate compiler for each of the archs specified and then uses lipo to mash all of the object files back together into a "fat" object file.
I just spent a little bit of time getting this Apple GCC wrapper working with macports GCC. If you want the details you can find them here:
http://thecoderslife.blogspot.com/2015/07/building-with-gcc-46-and-xcode-4.html
debian bookworm 的 gcc 源代码中也缺少 -arch。相当蹩脚。导致大量编译失败。
-arch is also missing in debian bookworm's gcc sources. Pretty lame. Makes for lots of failing compiles.