g++ compile 32/64

本文介绍了一种通过C语言编程来检测编译后的程序是32位还是64位的方法。利用sizeof运算符和assert宏定义,实现了检测程序位数的功能,并提供了编译指令以生成不同位数的程序。此外,还提供了一种使用文本编辑器检查可执行文件来判断其位数的方法。

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#include <stdio.h>
#include <assert.h>

// 获取程序位数(被编译为多少位的代码)
int GetProgramBits()
{
    return sizeof(int*) * 8;
}

int main(int argc, char* argv[])
{
    printf("bits:\t%d\n", GetProgramBits());
    assert( argc>1 );
    return 0;

}

-------------------------------------------

(a) compile 64 bit program

gcc -c test_code.c
gcc -o program.exe test_code.o

(b) compile 64 bit program

gcc -m64 -c test_code.c
gcc -m64 -o program.exe test_code.o

(c) compile 32 bit program

gcc -m32 -c test_code.c
gcc -m32 -o program.exe test_code.o

-------------
run the program:
./program.exe
then you will see if the compiled result is 32 or 64

--------------======

To check a file is 32bit or 64 bit,

open the exe file by nodepad++, in line2 or line3,

"L" == 32 bit

"d" == 64 bit


+ cd qtbase + /home/wanjuxiong/Qt/qt-everywhere-src-5.15.2/qtbase/configure -top-level -release -opensource -confirm-license -platform linux-g++ -device linux-rdk-x5-g++ -device-option CROSS_COMPILE=/opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/bin/aarch64-none-linux-gnu- --sysroot=/home/wanjuxiong/rootfs -prefix /usr/local/qt5 -nomake examples -nomake tests -opengl es2 -no-pch -v Creating qmake... gmake: Nothing to be done for 'first'. Command line: -release -opensource -confirm-license -platform linux-g++ -device linux-rdk-x5-g++ -device-option CROSS_COMPILE=/opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/bin/aarch64-none-linux-gnu- --sysroot=/home/wanjuxiong/rootfs -prefix /usr/local/qt5 -nomake examples -nomake tests -opengl es2 -no-pch -v This is the Qt Open Source Edition. You have already accepted the terms of the Open Source license. Running configuration tests... Checking for machine tuple... + /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/bin/aarch64-none-linux-gnu-g++ -dumpmachine > aarch64-none-linux-gnu test config.qtbase.tests.machineTuple succeeded Checking for valid makespec... + cd /home/wanjuxiong/Qt/qt-everywhere-src-5.15.2/config.tests/verifyspec && /home/wanjuxiong/Qt/qt-everywhere-src-5.15.2/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "QMAKE_CFLAGS += --sysroot=/home/wanjuxiong/rootfs" "QMAKE_CXXFLAGS += --sysroot=/home/wanjuxiong/rootfs" "QMAKE_LFLAGS += --sysroot=/home/wanjuxiong/rootfs" -early "CONFIG += cross_compile" /home/wanjuxiong/Qt/qt-everywhere-src-5.15.2/qtbase/config.tests/verifyspec + cd /home/wanjuxiong/Qt/qt-everywhere-src-5.15.2/config.tests/verifyspec && MAKEFLAGS= /usr/bin/gmake clean && MAKEFLAGS= /usr/bin/gmake > rm -f verifyspec.o > rm -f *~ core *.core > /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/bin/aarch64-none-linux-gnu-g++ -c -pipe -march=armv8-a+simd --sysroot=/home/wanjuxiong/rootfs -O2 -w -fPIC
03-13
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