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how can I detect if g++ compiled without errors

Ahmad Al-Mutawa

12/7/23, 9:18 AM

I have a script file to automatically compile a C++ program, then automatically run the executable.

script

g++ -o bin/program main.cpp 
bin/program

The problem is, sometimes the compiler encounters an error, and the executable is not generated. Therefor, the script will be running an outdated version.

How can I detect if g++ was unable to generate the executable, so that I may prevent the script from running the file?

298

2 + 3

scripting

linux

Romeo Ninov

12/7/23, 9:21 AM

Exit code from `g++` execution?

Ahmad Al-Mutawa

12/7/23, 9:39 AM

how can I check the exit code from g++? @RomeoNinov

Romeo Ninov

12/7/23, 9:46 AM

See my answer how to exec the program if `g++` finish with no error

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Romeo Ninov

12/7/23, 9:45 AM

You can check the exit code of execution of g++ like this:

g++ -o bin/program main.cpp 
if [ "$?" -eq 0 ]
then bin/program
fi

+ 2

Martin

12/7/23, 1:07 PM

Ouch. While this works, this is bad coding style - you should do it like that: `if g++ -o bin/program main.cpp; then ... fi`

Romeo Ninov

12/7/23, 1:34 PM

@Martin, `if` in my example is perfectly correct usage. Yes, you can add compilation in `if` but think about the case when your line is 100 chars long. Or more :)

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fuero

12/7/23, 9:37 AM

Check if the file exists first:

test -x foo && ./foo

+ 2

Gerald Schneider

12/7/23, 9:58 AM

won't help if it still exists from a previous successful compilation.

fuero

12/7/23, 9:46 PM

True if you don't clean it first.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: how can I detect if g++ compiled without errors

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