how to compile g++ app and run anywhere?

Question

my program compiled and worked fine with:

g++ main.cpp exm1.cpp exm2.cpp -o main.o

i want to compile this app and run anywhere
how can i?
i try this code

g++ -g -Wall -I/MyApp/lib -static-libgcc -static-libstdc++ -static main.cpp exm1.cpp exm2.cpp -o main.o

but not work
in lib folder has 2 files:

exm1.h
exm2.h

main.cpp included:

#include <fstream>
#include <iostream>
#include <string>
#include <streambuf>
#include <stdlib.h>
#include "lib/exm1.h"
#include "lib/exm2.h"

my linux is kali, and i want run this app on CentOS 6
please help me,thanks

What do you mean by "run anywhere"? What do you mean by "but not work"? — Some programmer dude, Sep 04 '15 at 14:14
Oh, and have you tried to just use `-static` to link *all* libraries statically? — Some programmer dude, Sep 04 '15 at 14:19
i compiled in kali and run main.o , and work fine, but main.o not work on centos — nima, Sep 04 '15 at 14:19
i want to compile this app on kali, and run in centos without compile — nima, Sep 04 '15 at 14:22
Please be more specific. When you say that running the progran doesn't work, *how* doesn't it work? What happens when you run it? Do you get any messages? You might want to [read about how to ask good questions](http://stackoverflow.com/help/how-to-ask) — Some programmer dude, Sep 04 '15 at 14:22
when i run main.o in centos, not work, `-bash: ./main.o: cannot execute binary file` — nima, Sep 04 '15 at 14:25
if you type `file main.o` what you see? I expect your executable uses shared libs. — c.bear, Sep 04 '15 at 14:30
`main.o: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked, for GNU/Linux 2.6.32, from '8@%rdi 8@%rsi', not stripped` — nima, Sep 04 '15 at 14:32
i think is 32bit, `Linux localhost.localdomain 2.6.32-220.7.1.el6.i686 #1 SMP Sun May 6 05:24:22 EDT 2012 i686 i686 i386 GNU/Linux` — nima, Sep 04 '15 at 14:37
On an unrelated note, the filename suffix `.o` is usually use for *object* files. Executable files usually don't have a suffix (also known as an extension) at all. — Some programmer dude, Sep 04 '15 at 14:37

score 1 · Answer 1 · answered Jan 07 '21 at 12:40

As C. bear said, use the -m32 flag so the program is able to run on 64- and 32- bit systems. In doing this, You'll also have to install the 32bit stdlibs. I'm not sure how to do this on kali, give it a google. Another thing you can do to avoid having users install external libraries (if you use them at any point) is to statically link you executable. Use the -static flag to do this. However, because all your app's dependencies (including the stdlibs) will be in a single file, it will get pretty big. On the other hand, loading times will be better, because your app doesn't have to run the dynamic linker and wait for it to link your external libraries as you call them.

score 0 · Accepted Answer · answered Sep 04 '15 at 14:41

0

So from comments one reason could be you executable is 64-bit and centOS a 32-bit sytem. Try compilation with -m32 flag.

answered Sep 04 '15 at 14:41

c.bear

1,197
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`/usr/include/c++/4.9/iosfwd:38:28: fatal error: bits/c++config.h: No such file or directory #include ^ compilation terminated. ` – nima Sep 04 '15 at 14:47
1

http://stackoverflow.com/questions/4643197/missing-include-bits-cconfig-h-when-cross-compiling-64-bit-program-on-32-bit seems a frequent issue – c.bear Sep 04 '15 at 14:52

Basile Starynkevitch · Answer 3 · 2021-01-07T12:52:34.940

how to compile g++ app and run anywhere?

It is not easily possible. For example, an ELF executable produced by GCC on a recent Debian/x86-64 computer won't run on a RaspberryPi (with a linux for ARM 32 bits, e.g. some Raspbian)

Read more about execve(2), elf(5) and about fat binaries

Be aware that the GCC compiler suite can be built (from its source code) as a cross-compiler (but you'll need to rebuild GCC for every different target system).

I recommend to invoke GCC as g++ -Wall -Wextra -g during the debugging phase (and use GDB). Once your software is debugged, compile it with g++ -Wall -Wextra -O2 to get an optimized binary (or even compile and link it with g++ -Wall -Wextra -O3 -flto)

how to compile g++ app and run anywhere?

3 Answers3