/* -*- c-file-style: "java"; indent-tabs-mode: nil; fill-column: 78 -*- * * distcc -- A simple distributed compiler system * $Header: /cvs/karma/distcc/src/cpp.c,v 1.1.1.1 2005/05/06 05:09:42 deatley Exp $ * * Copyright (C) 2002 by Martin Pool <mbp@samba.org> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA */ /** * @file * * Run the preprocessor. Client-side only. **/ #include "config.h" #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include "distcc.h" #include "trace.h" #include "exitcode.h" #include "util.h" #include "strip.h" #include "implicit.h" #include "exec.h" #include "tempfile.h" #include "cpp.h" /** * If the input filename is a plain source file rather than a * preprocessed source file, then preprocess it to a temporary file * and return the name in @p cpp_fname. * * The preprocessor may still be running when we return; you have to * wait for @p cpp_fid to exit before the output is complete. This * allows us to overlap opening the TCP socket, which probably doesn't * use many cycles, with running the preprocessor. * * Rather than setting -o, we could capture stdout from cpp, remove the -o * option, add -E, and look at the results of that. That might avoid problems * with compilers that have trouble with -o and -E. This may include some * versions of gcc? **/ int dcc_cpp_maybe(char **argv, char *input_fname, char **cpp_fname, pid_t *cpp_pid) { char **cpp_argv; int ret; *cpp_pid = 0; if (dcc_is_preprocessed(input_fname)) { /* already preprocessed, great. */ if (!(*cpp_fname = strdup(input_fname))) { rs_fatal("couldn't duplicate string"); } return 0; } *cpp_fname = dcc_make_tmpnam("cppout", ".i"); /* FIXME: Stripping -o fixes some, but not all problems with -MD. * * It does fix compilers that can't handle -E -o, such as Sun. * * It also avoids gcc-3.2 sending dependencies to the -o file with -MD -E. * * gcc-3.2 with -MD without -E determines the output file based on whether * a -o option is given. * * I think at the moment distcc may cause dependencies to be written to * the source directory, when plain gcc may write them to the output * directory. * * We could fix that by synthesizing a -MF option if one is needed and not * present, by reimplementing gcc's rules for deciding where to put it. * * However that has several problems: gcc-2.95 doesn't have a -MF option, * and in any case it puts the default .d file in the working directory * rather than the source or output directory. * * So this change allows you to get dependencies; but if you're not * building everything in a single directory you need to use -MF to set * the output location. * * As a workaround people might just specify a -MF option. */ if ((ret = dcc_strip_dasho(argv, &cpp_argv)) || (ret = dcc_set_action_opt(cpp_argv, "-E"))) return ret; return dcc_spawn_child(cpp_argv, cpp_pid, "/dev/null", *cpp_fname, NULL); }