how to use stdin pipe as source input for gcc?

Question

This is my try:

CMD file:

@SET PATH=%PATH%;D:\mingw\bin
type test10.cpp | g++ -xc++ -o test10.exe

code (irrelevant here): int main() {}

error I get:

g++: fatal error: no input files
compilation terminated.

I thought that the -x option is for signalizing stdin input, gcc itself said me that.

possible duplicate of [Is it possible to get gcc to read from a pipe?](http://stackoverflow.com/questions/1003644/is-it-possible-to-get-gcc-to-read-from-a-pipe) — ks1322, Mar 03 '13 at 09:45

score 16 · Accepted Answer · answered Jan 28 '13 at 13:49

16

The -x option specifies the input language, but it doesn't tell g++ to read from stdin. To do that, you can pass a single dash as a file name.

type test10.cpp | g++ -o test10.exe -x c++ -

answered Jan 28 '13 at 13:49

John Kugelman

349,597
67
533
578

score 0 · Answer 2 · answered Dec 24 '20 at 05:48

you can use here doc in the interactive shell. for example:

gcc -x c - <<eof
#include <stdio.h>

void foo()
{
    int a = 10;
    static int sa = 10;

    a += 5;
    sa += 5;

    printf("a = %d, sa = %d\n", a, sa);
}


int main()
{
    int i;

    for (i = 0; i < 10; ++i)
        foo();
}
eof

reference

how to use stdin pipe as source input for gcc?

2 Answers2

Linked