6 ms·

Want to "skip" the compile step? //usr/bin/tcc -run $0; exit main() { printf("Hello\n"); return 0; } Just `chmod +x` and run it...

shakna 6y ago
And add the -b commandline flag to enable the memory and bounds checker.
mmastrac 6y ago
How does this work? Is there an alternate form for #! (aka shebang)? EDIT: hah, I should have realized that "//" is the C comment and "//usr/bin/tcc" is equivalent to "/usr/bin/tcc". Clever!
- dfabulich 6y ago
  "C comment," you mean. So it's running the file as a shell script, where the first line runs tcc on the current file and quits.
  - mmastrac 6y ago
    Fixed typo, thanks. Yeah for some reason it didn't click when I saw it.
- banana_giraffe 6y ago
  I always love these things that are really scripts in two (or more) languages. Common is something like this on Windows to make a command script a Perl script. It lets you run your Perl script without having to make sure you had .pl extensions associated. Though, you needed Perl installed, so I never quite got the point. @rem = '--*--Perl-*-- @echo off echo Hello from a command script perl -x -S %0 %* goto endofperl @rem '; #!perl print "Hello from Perl!\n"; __END__ :endofperl By far very less common is to stuff some Perl code in a C# source file. A dev that was way too clever for his own code did this to have a Perl script that would update a C# script file and be self contained. This is a simple example of what it looked like, minus the instant headache anyone got that had to look at the real version: #if PerlScript $csharp=<<WhyJustWhy; #endif using System; namespace Example { public static class Program { static void Main() { Console.WriteLine("Hello from C#"); } } } #if PerlScript WhyJustWhy print("Hello from Perl!") __END__ #endif
hawski 6y ago
It's obviously not the same, but you can emulate this with a conventional compiler: #if 0 set -e; [ "$0" -nt "$0.bin" ] && cc "$0" -o "$0.bin" exec "$0.bin" "$@" #endif #include <stdio.h> int main(int argc, char *argv[]) { puts("Hello world!"); return 0; } It works, because by default system shell will be spawned.
sergeykish 6y ago
From man tcc(1): #!/usr/bin/tcc -run #include <stdio.h> int main() { printf("Hello World\n"); return 0; }
keyle 6y ago
Just as a side note... It's important to say that it still does get compiled... it's not some kind of interpreted mode.
nialv7 6y ago
D code can also be run this way: #!/usr/bin/rdmd void main() { import std.stdio; writeln("hello"); }

shakna 6y ago

And add the -b commandline flag to enable the memory and bounds checker.

mmastrac 6y ago

How does this work? Is there an alternate form for #! (aka shebang)? EDIT: hah, I should have realized that "//" is the C comment and "//usr/bin/tcc" is equivalent to "/usr/bin/tcc". Clever!

dfabulich 6y ago
"C comment," you mean. So it's running the file as a shell script, where the first line runs tcc on the current file and quits.
- mmastrac 6y ago
  Fixed typo, thanks. Yeah for some reason it didn't click when I saw it.
banana_giraffe 6y ago
I always love these things that are really scripts in two (or more) languages. Common is something like this on Windows to make a command script a Perl script. It lets you run your Perl script without having to make sure you had .pl extensions associated. Though, you needed Perl installed, so I never quite got the point. @rem = '--*--Perl-*-- @echo off echo Hello from a command script perl -x -S %0 %* goto endofperl @rem '; #!perl print "Hello from Perl!\n"; __END__ :endofperl By far very less common is to stuff some Perl code in a C# source file. A dev that was way too clever for his own code did this to have a Perl script that would update a C# script file and be self contained. This is a simple example of what it looked like, minus the instant headache anyone got that had to look at the real version: #if PerlScript $csharp=<<WhyJustWhy; #endif using System; namespace Example { public static class Program { static void Main() { Console.WriteLine("Hello from C#"); } } } #if PerlScript WhyJustWhy print("Hello from Perl!") __END__ #endif

hawski 6y ago

It's obviously not the same, but you can emulate this with a conventional compiler: #if 0 set -e; [ "$0" -nt "$0.bin" ] && cc "$0" -o "$0.bin" exec "$0.bin" "$@" #endif #include <stdio.h> int main(int argc, char *argv[]) { puts("Hello world!"); return 0; } It works, because by default system shell will be spawned.

sergeykish 6y ago

From man tcc(1): #!/usr/bin/tcc -run #include <stdio.h> int main() { printf("Hello World\n"); return 0; }

keyle 6y ago

Just as a side note... It's important to say that it still does get compiled... it's not some kind of interpreted mode.

nialv7 6y ago

D code can also be run this way: #!/usr/bin/rdmd void main() { import std.stdio; writeln("hello"); }