Short answer:
//usr/bin/clang "$0" && exec ./a.out "$@"
int main(){
return 0;
}
The trick is that your text file must be both valid C/C++ code and shell script. Remember to exit
from the shell script before the interpreter reaches the C/C++ code, or invoke exec
magic.
Run with chmod +x main.c; ./main.c
.
A shebang like #!/usr/bin/tcc -run
isn’t needed because unix-like systems will already execute the text file within the shell.
(adapted from this comment)
I used it in my C++ script:
//usr/bin/clang++ -O3 -std=c++11 "$0" && ./a.out; exit
#include <iostream>
int main() {
for (auto i: {1, 2, 3})
std::cout << i << std::endl;
return 0;
}
If your compilation line grows too much you can use the preprocessor (adapted from this answer) as this plain old C code shows:
#if 0
clang "$0" && ./a.out
rm -f ./a.out
exit
#endif
int main() {
return 0;
}
Of course you can cache the executable:
#if 0
EXEC=${0%.*}
test -x "$EXEC" || clang "$0" -o "$EXEC"
exec "$EXEC"
#endif
int main() {
return 0;
}
Now, for the truly eccentric Java developer:
/*/../bin/true
CLASS_NAME=$(basename "${0%.*}")
CLASS_PATH="$(dirname "$0")"
javac "$0" && java -cp "${CLASS_PATH}" ${CLASS_NAME}
rm -f "${CLASS_PATH}/${CLASS_NAME}.class"
exit
*/
class Main {
public static void main(String[] args) {
return;
}
}
D programmers simply put a shebang at the beginning of text file without breaking the syntax:
#!/usr/bin/rdmd
void main(){}
See:
- https://unix.stackexchange.com/a/373229/23567
- https://stackoverflow.com/a/12296348/199332