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/* -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 99; -*- */
/* vim: set ts=4 sw=4 et tw=99: */
/*
* distcc -- A simple distributed compiler system
*
* Copyright (C) 2002, 2003 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* @file
*
* Run the preprocessor. Client-side only.
**/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "client.h"
using namespace std;
bool dcc_is_preprocessed(const string &sfile)
{
if (sfile.size() < 3) {
return false;
}
int last = sfile.size() - 1;
if ((sfile[last - 1] == '.') && (sfile[last] == 'i')) {
return true; // .i
}
if ((sfile[last - 2] == '.') && (sfile[last - 1] == 'i') && (sfile[last] == 'i')) {
return true; // .ii
}
return false;
}
/**
* 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.
**/
pid_t call_cpp(CompileJob &job, int fdwrite, int fdread)
{
flush_debug();
pid_t pid = fork();
if (pid == -1) {
log_perror("failed to fork:");
return -1; /* probably */
}
if (pid != 0) {
/* Parent. Close the write fd. */
if (fdwrite > -1) {
if ((-1 == close(fdwrite)) && (errno != EBADF)){
log_perror("close() failed");
}
}
return pid;
}
/* Child. Close the read fd, in case we have one. */
if (fdread > -1) {
if ((-1 == close(fdread)) && (errno != EBADF)){
log_perror("close failed");
}
}
int ret = dcc_ignore_sigpipe(0);
if (ret) { /* set handler back to default */
_exit(ret);
}
char **argv;
if (dcc_is_preprocessed(job.inputFile())) {
/* already preprocessed, great.
write the file to the fdwrite (using cat) */
argv = new char*[2 + 1];
argv[0] = strdup("/bin/cat");
argv[1] = strdup(job.inputFile().c_str());
argv[2] = nullptr;
} else {
list<string> flags = job.localFlags();
appendList(flags, job.restFlags());
for (list<string>::iterator it = flags.begin(); it != flags.end();) {
/* This has a duplicate meaning. it can either include a file
for preprocessing or a precompiled header. decide which one. */
if ((*it) == "-include") {
++it;
if (it != flags.end()) {
std::string p = (*it);
if (access(p.c_str(), R_OK) < 0 && access((p + ".gch").c_str(), R_OK) == 0) {
// PCH is useless for preprocessing, ignore the flag.
list<string>::iterator o = --it;
++it;
flags.erase(o);
o = it++;
flags.erase(o);
}
}
} else if ((*it) == "-include-pch") {
list<string>::iterator o = it;
++it;
if (it != flags.end()) {
std::string p = (*it);
if (access(p.c_str(), R_OK) == 0) {
// PCH is useless for preprocessing (and probably slows things down), ignore the flag.
flags.erase(o);
o = it++;
flags.erase(o);
}
}
} else if ((*it) == "-fpch-preprocess") {
// This would add #pragma GCC pch_preprocess to the preprocessed output, which would make
// the remote GCC try to load the PCH directly and fail. Just drop it. This may cause a build
// failure if the -include check above failed to detect usage of a PCH file (e.g. because
// it needs to be found in one of the -I paths, which we don't check) and the header file
// itself doesn't exist.
flags.erase(it++);
} else if ((*it) == "-fmodules" || (*it) == "-fcxx-modules" || (*it) == "-fmodules-ts"
|| (*it).find("-fmodules-cache-path=") == 0) {
// Clang modules, handle like with PCH, remove the flags and compile remotely
// without them.
flags.erase(it++);
} else {
++it;
}
}
int argc = flags.size();
argc++; // the program
argc += 2; // -E file.i
argc += 1; // -frewrite-includes / -fdirectives-only
argv = new char*[argc + 1];
argv[0] = strdup(find_compiler(job).c_str());
int i = 1;
for (list<string>::const_iterator it = flags.begin(); it != flags.end(); ++it) {
argv[i++] = strdup(it->c_str());
}
argv[i++] = strdup("-E");
argv[i++] = strdup(job.inputFile().c_str());
if (compiler_only_rewrite_includes(job)) {
if( compiler_is_clang(job)) {
argv[i++] = strdup("-frewrite-includes");
} else { // gcc
argv[i++] = strdup("-fdirectives-only");
}
}
argv[i++] = nullptr;
}
string argstxt = argv[ 0 ];
for( int i = 1; argv[ i ] != nullptr; ++i ) {
argstxt += ' ';
argstxt += argv[ i ];
}
trace() << "preparing source to send: " << argstxt << endl;
if (fdwrite != STDOUT_FILENO) {
/* Ignore failure */
close(STDOUT_FILENO);
dup2(fdwrite, STDOUT_FILENO);
close(fdwrite);
}
dcc_increment_safeguard(SafeguardStepCompiler);
execv(argv[0], argv);
int exitcode = ( errno == ENOENT ? 127 : 126 );
ostringstream errmsg;
errmsg << "execv " << argv[0] << " failed";
log_perror(errmsg.str());
_exit(exitcode);
}
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