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? — ks1322
– ks1322, Commented Mar 3, 2013 at 9:45

bric3 · Accepted Answer · 2025-09-22 08:17:37Z

17

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++ -

edited Sep 22 at 8:17

bric3

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answered Jan 28, 2013 at 13:49

John Kugelman

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jianyongli · Accepted Answer · 2020-12-24 05:48:45Z

1

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

answered Dec 24, 2020 at 5:48

jianyongli

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