Run some C code. -p to simply pass a printf format string and args, -iFILE to include FILE, -I -L -l -E -S -D and -O will be passed as such to gcc.Examples: CFLAGS=-std=c99 cexpr.sh 'puts("hello world");'; cexpr.sh -imath.h -lm -p '%g' 'log2(8)'

cexpr.sh

#!/bin/bash

do_printf=off
incs=""
flags="$CFLAGS"
only_preproc=off
no_asm=off

if [ "$CC" = "" ]; then
	CC=gcc
fi

while getopts i:pI:L:l:W:O:D:SEf: opt "$@"; do
	case $opt in
	I|L|l|W|O|D)
		flags="$flags -$opt$OPTARG"
		;;
	f)
		flags="$flags $OPTARG"
		;;
	S)
		no_asm=on
		;;
	E)
		only_preproc=on
		;;
	p)
		do_printf=on
		;;
	i)
		incs="$incs
#include \"$OPTARG\""
		;;
	\?)
		echo "Invalid option: -$OPTARG" >&2
		exit 1
		;;
	esac
done

shift $((OPTIND - 1))

if [ "$do_printf" = "on" ]; then
	fmt="$1"
	shift
	args=""
	for arg in "$@"; do
		args="$args, $arg"
	done
	stmts="
	printf(\"$fmt\\n\"$args);"
else
		
	stmts=""
	for stmt in "$@"; do
		stmts="$stmts
	$stmt;"
	done
fi

args="-x c -Wall -Werror $flags -"

{
	cat << EOF
#include <stdlib.h>
#include <stdio.h>
$incs

int main (int argc, char *argv[]) {$stmts
	return 0;
}
EOF
} | if [ "$only_preproc" = on ]; then
	"$CC" $args -E -o -
elif [ "$no_asm" = on ]; then
	"$CC" $args -S -o -
else
	tmp=/tmp/cexpr.$$.out
	"$CC" $args -o $tmp && {
		$tmp
		code=$?
		rm -f $tmp
		exit $code
	}
fi