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ccache.c
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/*
* ccache -- a fast C/C++ compiler cache
*
* Copyright (C) 2002-2007 Andrew Tridgell
* Copyright (C) 2009-2011 Joel Rosdahl
*
* 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 3 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
*/
#include "ccache.h"
#include "compopt.h"
#ifdef HAVE_GETOPT_LONG
#include <getopt.h>
#else
#include "getopt_long.h"
#endif
#include "hashtable.h"
#include "hashtable_itr.h"
#include "hashutil.h"
#include "language.h"
#include "manifest.h"
static const char VERSION_TEXT[] =
MYNAME " version %s\n"
"\n"
"Copyright (C) 2002-2007 Andrew Tridgell\n"
"Copyright (C) 2009-2011 Joel Rosdahl\n"
"\n"
"This program is free software; you can redistribute it and/or modify it under\n"
"the terms of the GNU General Public License as published by the Free Software\n"
"Foundation; either version 3 of the License, or (at your option) any later\n"
"version.\n";
static const char USAGE_TEXT[] =
"Usage:\n"
" " MYNAME " [options]\n"
" " MYNAME " compiler [compiler options]\n"
" compiler [compiler options] (via symbolic link)\n"
"\n"
"Options:\n"
" -c, --cleanup delete old files and recalculate size counters\n"
" (normally not needed as this is done automatically)\n"
" -C, --clear clear the cache completely\n"
" -F, --max-files=N set maximum number of files in cache to N (use 0 for\n"
" no limit)\n"
" -M, --max-size=SIZE set maximum size of cache to SIZE (use 0 for no\n"
" limit; available suffixes: G, M and K; default\n"
" suffix: G)\n"
" -s, --show-stats show statistics summary\n"
" -z, --zero-stats zero statistics counters\n"
"\n"
" -h, --help print this help text\n"
" -V, --version print version and copyright information\n"
"\n"
"See also <http://ccache.samba.org>.\n";
/* current working directory taken from $PWD, or getcwd() if $PWD is bad */
char *current_working_dir = NULL;
/* the base cache directory */
char *cache_dir = NULL;
/* the debug logfile name, if set */
char *cache_logfile = NULL;
/* base directory (from CCACHE_BASEDIR) */
char *base_dir = NULL;
/* the original argument list */
static struct args *orig_args;
/* the source file */
static char *input_file;
/* The output file being compiled to. */
static char *output_obj;
/* The path to the dependency file (implicit or specified with -MF). */
static char *output_dep;
/*
* Name (represented as a struct file_hash) of the file containing the cached
* object code.
*/
static struct file_hash *cached_obj_hash;
/*
* Full path to the file containing the cached object code
* (cachedir/a/b/cdef[...]-size.o).
*/
static char *cached_obj;
/*
* Full path to the file containing the standard error output
* (cachedir/a/b/cdef[...]-size.stderr).
*/
static char *cached_stderr;
/*
* Full path to the file containing the dependency information
* (cachedir/a/b/cdef[...]-size.d).
*/
static char *cached_dep;
/*
* Full path to the file containing the manifest
* (cachedir/a/b/cdef[...]-size.manifest).
*/
static char *manifest_path;
/*
* Time of compilation. Used to see if include files have changed after
* compilation.
*/
static time_t time_of_compilation;
/* Bitmask of SLOPPY_*. */
unsigned sloppiness = 0;
/*
* Files included by the preprocessor and their hashes/sizes. Key: file path.
* Value: struct file_hash.
*/
static struct hashtable *included_files;
/* is gcc being asked to output dependencies? */
static bool generating_dependencies;
/* the extension of the file (without dot) after pre-processing */
static const char *i_extension;
/* the name of the temporary pre-processor file */
static char *i_tmpfile;
/* are we compiling a .i or .ii file directly? */
static bool direct_i_file;
/* the name of the cpp stderr file */
static char *cpp_stderr;
/*
* Full path to the statistics file in the subdirectory where the cached result
* belongs (CCACHE_DIR/X/stats).
*/
char *stats_file = NULL;
/* can we safely use the unification hashing backend? */
static bool enable_unify;
/* should we use the direct mode? */
static bool enable_direct = true;
/*
* Whether to enable compression of files stored in the cache. (Manifest files
* are always compressed.)
*/
static bool enable_compression = false;
/* number of levels (1 <= nlevels <= 8) */
static int nlevels = 2;
/*
* Whether we should use the optimization of passing the already existing
* preprocessed source code to the compiler.
*/
static bool compile_preprocessed_source_code;
/* Whether the output is a precompiled header */
static bool output_is_precompiled_header = false;
/*
* Whether we are using a precompiled header (either via -include or #include).
*/
static bool using_precompiled_header = false;
/* How long (in microseconds) to wait before breaking a stale lock. */
unsigned lock_staleness_limit = 2000000;
enum fromcache_call_mode {
FROMCACHE_DIRECT_MODE,
FROMCACHE_CPP_MODE,
FROMCACHE_COMPILED_MODE
};
/*
* This is a string that identifies the current "version" of the hash sum
* computed by ccache. If, for any reason, we want to force the hash sum to be
* different for the same input in a new ccache version, we can just change
* this string. A typical example would be if the format of one of the files
* stored in the cache changes in a backwards-incompatible way.
*/
static const char HASH_PREFIX[] = "3";
static void
add_prefix(struct args *orig_args)
{
char *env;
env = getenv("CCACHE_PREFIX");
if (env && strlen(env) > 0) {
char *e;
char *tok, *saveptr = NULL;
struct args *prefix = args_init(0, NULL);
int i;
e = x_strdup(env);
for (tok = strtok_r(e, " ", &saveptr);
tok;
tok = strtok_r(NULL, " ", &saveptr)) {
char *p;
p = find_executable(tok, MYNAME);
if (!p) {
fatal("%s: %s", tok, strerror(errno));
}
args_add(prefix, p);
free(p);
}
free(e);
cc_log("Using command-line prefix %s", env);
for (i = prefix->argc; i != 0; i--) {
args_add_prefix(orig_args, prefix->argv[i-1]);
}
args_free(prefix);
}
}
/* Something went badly wrong - just execute the real compiler. */
static void
failed(void)
{
/* strip any local args */
args_strip(orig_args, "--ccache-");
/* add prefix from CCACHE_PREFIX */
add_prefix(orig_args);
cc_log("Failed; falling back to running the real compiler");
cc_log_argv("Executing ", orig_args->argv);
exitfn_call();
execv(orig_args->argv[0], orig_args->argv);
fatal("%s: execv returned (%s)", orig_args->argv[0], strerror(errno));
}
static void
clean_up_tmp_files()
{
/* delete intermediate pre-processor file if needed */
if (i_tmpfile) {
if (!direct_i_file) {
tmp_unlink(i_tmpfile);
}
free(i_tmpfile);
i_tmpfile = NULL;
}
/* delete the cpp stderr file if necessary */
if (cpp_stderr) {
tmp_unlink(cpp_stderr);
free(cpp_stderr);
cpp_stderr = NULL;
}
}
static const char *
temp_dir()
{
static char* path = NULL;
if (path) return path; /* Memoize */
path = getenv("CCACHE_TEMPDIR");
if (!path) {
path = format("%s/tmp", cache_dir);
}
return path;
}
/*
* Transform a name to a full path into the cache directory, creating needed
* sublevels if needed. Caller frees.
*/
static char *
get_path_in_cache(const char *name, const char *suffix)
{
int i;
char *path;
char *result;
path = x_strdup(cache_dir);
for (i = 0; i < nlevels; ++i) {
char *p = format("%s/%c", path, name[i]);
free(path);
path = p;
}
result = format("%s/%s%s", path, name + nlevels, suffix);
free(path);
return result;
}
/*
* This function hashes an include file and stores the path and hash in the
* global included_files variable. If the include file is a PCH, cpp_hash is
* also updated. Takes over ownership of path.
*/
static void
remember_include_file(char *path, size_t path_len, struct mdfour *cpp_hash)
{
#ifdef _WIN32
DWORD attributes;
#endif
struct mdfour fhash;
struct stat st;
char *source = NULL;
size_t size;
int result;
bool is_pch;
if (path_len >= 2 && (path[0] == '<' && path[path_len - 1] == '>')) {
/* Typically <built-in> or <command-line>. */
goto ignore;
}
if (str_eq(path, input_file)) {
/* Don't remember the input file. */
goto ignore;
}
if (hashtable_search(included_files, path)) {
/* Already known include file. */
goto ignore;
}
#ifdef _WIN32
/* stat fails on directories on win32 */
attributes = GetFileAttributes(path);
if (attributes != INVALID_FILE_ATTRIBUTES &&
attributes & FILE_ATTRIBUTE_DIRECTORY)
goto ignore;
#endif
if (stat(path, &st) != 0) {
cc_log("Failed to stat include file %s: %s", path, strerror(errno));
goto failure;
}
if (S_ISDIR(st.st_mode)) {
/* Ignore directory, typically $PWD. */
goto ignore;
}
if (!S_ISREG(st.st_mode)) {
/* Device, pipe, socket or other strange creature. */
cc_log("Non-regular include file %s", path);
goto failure;
}
/* Let's hash the include file. */
if (!(sloppiness & SLOPPY_INCLUDE_FILE_MTIME)
&& st.st_mtime >= time_of_compilation) {
cc_log("Include file %s too new", path);
goto failure;
}
hash_start(&fhash);
is_pch = is_precompiled_header(path);
if (is_pch) {
struct file_hash pch_hash;
if (!hash_file(&fhash, path)) {
goto failure;
}
hash_result_as_bytes(&fhash, pch_hash.hash);
pch_hash.size = fhash.totalN;
hash_delimiter(cpp_hash, "pch_hash");
hash_buffer(cpp_hash, pch_hash.hash, sizeof(pch_hash.hash));
}
if (enable_direct) {
struct file_hash *h;
if (!is_pch) { /* else: the file has already been hashed. */
if (st.st_size > 0) {
if (!read_file(path, st.st_size, &source, &size)) {
goto failure;
}
} else {
source = x_strdup("");
size = 0;
}
result = hash_source_code_string(&fhash, source, size, path);
if (result & HASH_SOURCE_CODE_ERROR
|| result & HASH_SOURCE_CODE_FOUND_TIME) {
goto failure;
}
}
h = x_malloc(sizeof(*h));
hash_result_as_bytes(&fhash, h->hash);
h->size = fhash.totalN;
hashtable_insert(included_files, path, h);
} else {
free(path);
}
free(source);
return;
failure:
cc_log("Disabling direct mode");
enable_direct = false;
/* Fall through. */
ignore:
free(path);
free(source);
}
/*
* Make a relative path from current working directory to path if path is under
* CCACHE_BASEDIR. Takes over ownership of path. Caller frees.
*/
static char *
make_relative_path(char *path)
{
char *relpath;
if (!base_dir || !str_startswith(path, base_dir)) {
return path;
}
relpath = get_relative_path(current_working_dir, path);
free(path);
return relpath;
}
/*
* This function reads and hashes a file. While doing this, it also does these
* things:
*
* - Makes include file paths whose prefix is CCACHE_BASEDIR relative when
* computing the hash sum.
* - Stores the paths and hashes of included files in the global variable
* included_files.
*/
static bool
process_preprocessed_file(struct mdfour *hash, const char *path)
{
char *data;
char *p, *q, *end;
size_t size;
if (!read_file(path, 0, &data, &size)) {
return false;
}
included_files = create_hashtable(1000, hash_from_string, strings_equal);
/* Bytes between p and q are pending to be hashed. */
end = data + size;
p = data;
q = data;
while (q < end - 7) { /* There must be at least 7 characters (# 1 "x") left
to potentially find an include file path. */
/*
* Check if we look at a line containing the file name of an included file.
* At least the following formats exist (where N is a positive integer):
*
* GCC:
*
* # N "file"
* # N "file" N
* #pragma GCC pch_preprocess "file"
*
* HP's compiler:
*
* #line N "file"
*
* AIX's compiler:
*
* #line N "file"
* #line N
*
* Note that there may be other lines starting with '#' left after
* preprocessing as well, for instance "# pragma".
*/
if (q[0] == '#'
/* GCC: */
&& ((q[1] == ' ' && q[2] >= '0' && q[2] <= '9')
/* GCC precompiled header: */
|| (q[1] == 'p'
&& str_startswith(&q[2], "ragma GCC pch_preprocess "))
/* HP/AIX: */
|| (q[1] == 'l' && q[2] == 'i' && q[3] == 'n' && q[4] == 'e'
&& q[5] == ' '))
&& (q == data || q[-1] == '\n')) {
char *path;
while (q < end && *q != '"' && *q != '\n') {
q++;
}
if (q < end && *q == '\n') {
/* A newline before the quotation mark -> no match. */
continue;
}
q++;
if (q >= end) {
cc_log("Failed to parse included file path");
free(data);
return false;
}
/* q points to the beginning of an include file path */
hash_buffer(hash, p, q - p);
p = q;
while (q < end && *q != '"') {
q++;
}
/* p and q span the include file path */
path = x_strndup(p, q - p);
path = make_relative_path(path);
hash_string(hash, path);
remember_include_file(path, q - p, hash);
p = q;
} else {
q++;
}
}
hash_buffer(hash, p, (end - p));
free(data);
return true;
}
/* run the real compiler and put the result in cache */
static void
to_cache(struct args *args)
{
char *tmp_stdout, *tmp_stderr, *tmp_obj;
struct stat st;
int status;
size_t added_bytes = 0;
unsigned added_files = 0;
if (create_parent_dirs(cached_obj) != 0) {
cc_log("Failed to create parent directories for %s: %s",
cached_obj, strerror(errno));
failed();
}
tmp_stdout = format("%s.tmp.stdout.%s", cached_obj, tmp_string());
tmp_stderr = format("%s.tmp.stderr.%s", cached_obj, tmp_string());
tmp_obj = format("%s.tmp.%s", cached_obj, tmp_string());
args_add(args, "-o");
args_add(args, tmp_obj);
/* Turn off DEPENDENCIES_OUTPUT when running cc1, because
* otherwise it will emit a line like
*
* tmp.stdout.vexed.732.o: /home/mbp/.ccache/tmp.stdout.vexed.732.i
*
* unsetenv() is on BSD and Linux but not portable. */
putenv("DEPENDENCIES_OUTPUT");
if (compile_preprocessed_source_code) {
args_add(args, i_tmpfile);
} else {
args_add(args, input_file);
}
cc_log("Running real compiler");
status = execute(args->argv, tmp_stdout, tmp_stderr);
args_pop(args, 3);
if (stat(tmp_stdout, &st) != 0 || st.st_size != 0) {
cc_log("Compiler produced stdout");
stats_update(STATS_STDOUT);
tmp_unlink(tmp_stdout);
tmp_unlink(tmp_stderr);
tmp_unlink(tmp_obj);
failed();
}
tmp_unlink(tmp_stdout);
/*
* Merge stderr from the preprocessor (if any) and stderr from the real
* compiler into tmp_stderr.
*/
if (cpp_stderr) {
int fd_cpp_stderr;
int fd_real_stderr;
int fd_result;
char *tmp_stderr2;
tmp_stderr2 = format("%s.tmp.stderr2.%s", cached_obj, tmp_string());
if (x_rename(tmp_stderr, tmp_stderr2)) {
cc_log("Failed to rename %s to %s: %s", tmp_stderr, tmp_stderr2,
strerror(errno));
failed();
}
fd_cpp_stderr = open(cpp_stderr, O_RDONLY | O_BINARY);
if (fd_cpp_stderr == -1) {
cc_log("Failed opening %s: %s", cpp_stderr, strerror(errno));
failed();
}
fd_real_stderr = open(tmp_stderr2, O_RDONLY | O_BINARY);
if (fd_real_stderr == -1) {
cc_log("Failed opening %s: %s", tmp_stderr2, strerror(errno));
failed();
}
fd_result = open(tmp_stderr, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666);
if (fd_result == -1) {
cc_log("Failed opening %s: %s", tmp_stderr, strerror(errno));
failed();
}
copy_fd(fd_cpp_stderr, fd_result);
copy_fd(fd_real_stderr, fd_result);
close(fd_cpp_stderr);
close(fd_real_stderr);
close(fd_result);
tmp_unlink(tmp_stderr2);
free(tmp_stderr2);
}
if (status != 0) {
int fd;
cc_log("Compiler gave exit status %d", status);
stats_update(STATS_STATUS);
fd = open(tmp_stderr, O_RDONLY | O_BINARY);
if (fd != -1) {
if (str_eq(output_obj, "/dev/null")
|| (access(tmp_obj, R_OK) == 0
&& move_file(tmp_obj, output_obj, 0) == 0)
|| errno == ENOENT) {
/* we can use a quick method of getting the failed output */
copy_fd(fd, 2);
close(fd);
tmp_unlink(tmp_stderr);
exit(status);
}
}
tmp_unlink(tmp_stderr);
tmp_unlink(tmp_obj);
failed();
}
if (stat(tmp_obj, &st) != 0) {
cc_log("Compiler didn't produce an object file");
stats_update(STATS_NOOUTPUT);
failed();
}
if (st.st_size == 0) {
cc_log("Compiler produced an empty object file");
stats_update(STATS_EMPTYOUTPUT);
failed();
}
if (stat(tmp_stderr, &st) != 0) {
cc_log("Failed to stat %s: %s", tmp_stderr, strerror(errno));
stats_update(STATS_ERROR);
failed();
}
if (st.st_size > 0) {
if (move_uncompressed_file(tmp_stderr, cached_stderr,
enable_compression) != 0) {
cc_log("Failed to move %s to %s: %s", tmp_stderr, cached_stderr,
strerror(errno));
stats_update(STATS_ERROR);
failed();
}
cc_log("Stored in cache: %s", cached_stderr);
if (enable_compression) {
stat(cached_stderr, &st);
}
added_bytes += file_size(&st);
added_files += 1;
} else {
tmp_unlink(tmp_stderr);
}
if (move_uncompressed_file(tmp_obj, cached_obj, enable_compression) != 0) {
cc_log("Failed to move %s to %s: %s", tmp_obj, cached_obj, strerror(errno));
stats_update(STATS_ERROR);
failed();
} else {
cc_log("Stored in cache: %s", cached_obj);
stat(cached_obj, &st);
added_bytes += file_size(&st);
added_files += 1;
}
/*
* Do an extra stat on the potentially compressed object file for the
* size statistics.
*/
if (stat(cached_obj, &st) != 0) {
cc_log("Failed to stat %s: %s", cached_obj, strerror(errno));
stats_update(STATS_ERROR);
failed();
}
stats_update_size(STATS_TOCACHE, added_bytes / 1024, added_files);
/* Make sure we have a CACHEDIR.TAG
* This can be almost anywhere, but might as well do it near the end
* as if we exit early we save the stat call
*/
if (create_cachedirtag(cache_dir) != 0) {
cc_log("Failed to create %s/CACHEDIR.TAG (%s)\n",
cache_dir, strerror(errno));
stats_update(STATS_ERROR);
failed();
}
free(tmp_obj);
free(tmp_stderr);
free(tmp_stdout);
}
/*
* Find the object file name by running the compiler in preprocessor mode.
* Returns the hash as a heap-allocated hex string.
*/
static struct file_hash *
get_object_name_from_cpp(struct args *args, struct mdfour *hash)
{
char *input_base;
char *tmp;
char *path_stdout, *path_stderr;
int status;
struct file_hash *result;
/* ~/hello.c -> tmp.hello.123.i
limit the basename to 10
characters in order to cope with filesystem with small
maximum filename length limits */
input_base = basename(input_file);
tmp = strchr(input_base, '.');
if (tmp != NULL) {
*tmp = 0;
}
if (strlen(input_base) > 10) {
input_base[10] = 0;
}
/* now the run */
path_stdout = format("%s/%s.tmp.%s.%s",
temp_dir(), input_base, tmp_string(), i_extension);
path_stderr = format("%s/tmp.cpp_stderr.%s", temp_dir(), tmp_string());
if (create_parent_dirs(path_stdout) != 0) {
char *parent = dirname(path_stdout);
fprintf(stderr,
"ccache: failed to create %s (%s)\n",
parent, strerror(errno));
free(parent);
exit(1);
}
time_of_compilation = time(NULL);
if (!direct_i_file) {
/* run cpp on the input file to obtain the .i */
args_add(args, "-E");
args_add(args, input_file);
status = execute(args->argv, path_stdout, path_stderr);
args_pop(args, 2);
} else {
/* we are compiling a .i or .ii file - that means we
can skip the cpp stage and directly form the
correct i_tmpfile */
path_stdout = input_file;
if (create_empty_file(path_stderr) != 0) {
cc_log("Failed to create %s: %s", path_stderr, strerror(errno));
stats_update(STATS_ERROR);
failed();
}
status = 0;
}
if (status != 0) {
if (!direct_i_file) {
tmp_unlink(path_stdout);
}
tmp_unlink(path_stderr);
cc_log("Preprocessor gave exit status %d", status);
stats_update(STATS_PREPROCESSOR);
failed();
}
if (enable_unify) {
/*
* When we are doing the unifying tricks we need to include the
* input file name in the hash to get the warnings right.
*/
hash_delimiter(hash, "unifyfilename");
hash_string(hash, input_file);
hash_delimiter(hash, "unifycpp");
if (unify_hash(hash, path_stdout) != 0) {
stats_update(STATS_ERROR);
tmp_unlink(path_stderr);
cc_log("Failed to unify %s", path_stdout);
failed();
}
} else {
hash_delimiter(hash, "cpp");
if (!process_preprocessed_file(hash, path_stdout)) {
stats_update(STATS_ERROR);
tmp_unlink(path_stderr);
failed();
}
}
hash_delimiter(hash, "cppstderr");
if (!hash_file(hash, path_stderr)) {
fatal("Failed to open %s: %s", path_stderr, strerror(errno));
}
i_tmpfile = path_stdout;
if (compile_preprocessed_source_code) {
/*
* If we are using the CPP trick, we need to remember this
* stderr data and output it just before the main stderr from
* the compiler pass.
*/
cpp_stderr = path_stderr;
} else {
tmp_unlink(path_stderr);
free(path_stderr);
}
result = x_malloc(sizeof(*result));
hash_result_as_bytes(hash, result->hash);
result->size = hash->totalN;
return result;
}
static void
update_cached_result_globals(struct file_hash *hash)
{
char *object_name;
object_name = format_hash_as_string(hash->hash, hash->size);
cached_obj_hash = hash;
cached_obj = get_path_in_cache(object_name, ".o");
cached_stderr = get_path_in_cache(object_name, ".stderr");
cached_dep = get_path_in_cache(object_name, ".d");
stats_file = format("%s/%c/stats", cache_dir, object_name[0]);
free(object_name);
}
/*
* Update a hash sum with information common for the direct and preprocessor
* modes.
*/
static void
calculate_common_hash(struct args *args, struct mdfour *hash)
{
struct stat st;
const char *compilercheck;
char *p;
hash_string(hash, HASH_PREFIX);
/*
* We have to hash the extension, as a .i file isn't treated the same
* by the compiler as a .ii file.
*/
hash_delimiter(hash, "ext");
hash_string(hash, i_extension);
if (stat(args->argv[0], &st) != 0) {
cc_log("Couldn't stat compiler %s: %s", args->argv[0], strerror(errno));
stats_update(STATS_COMPILER);
failed();
}
/*
* Hash information about the compiler.
*/
compilercheck = getenv("CCACHE_COMPILERCHECK");
if (!compilercheck) {
compilercheck = "mtime";
}
if (str_eq(compilercheck, "none")) {
/* Do nothing. */
} else if (str_eq(compilercheck, "content")) {
hash_delimiter(hash, "cc_content");
hash_file(hash, args->argv[0]);
} else if (str_eq(compilercheck, "mtime")) {
hash_delimiter(hash, "cc_mtime");
hash_int(hash, st.st_size);
hash_int(hash, st.st_mtime);
} else { /* command string */
if (!hash_multicommand_output(hash, compilercheck, orig_args->argv[0])) {
fatal("Failure running compiler check command: %s", compilercheck);
}
}
/*
* Also hash the compiler name as some compilers use hard links and
* behave differently depending on the real name.
*/
hash_delimiter(hash, "cc_name");
hash_string(hash, basename(args->argv[0]));
/* Possibly hash the current working directory. */
if (getenv("CCACHE_HASHDIR")) {
char *cwd = gnu_getcwd();
if (cwd) {
hash_delimiter(hash, "cwd");
hash_string(hash, cwd);
free(cwd);
}
}
p = getenv("CCACHE_EXTRAFILES");
if (p) {
char *path, *q, *saveptr = NULL;
p = x_strdup(p);
q = p;
while ((path = strtok_r(q, PATH_DELIM, &saveptr))) {
cc_log("Hashing extra file %s", path);
hash_delimiter(hash, "extrafile");
if (!hash_file(hash, path)) {
stats_update(STATS_BADEXTRAFILE);
failed();
}
q = NULL;
}
free(p);
}
}
/*
* Update a hash sum with information specific to the direct and preprocessor
* modes and calculate the object hash. Returns the object hash on success,
* otherwise NULL. Caller frees.
*/
static struct file_hash *
calculate_object_hash(struct args *args, struct mdfour *hash, int direct_mode)
{
int i;
char *manifest_name;
struct stat st;
int result;
struct file_hash *object_hash = NULL;
/* first the arguments */
for (i = 1; i < args->argc; i++) {
/* -L doesn't affect compilation. */
if (i < args->argc-1 && str_eq(args->argv[i], "-L")) {
i++;
continue;
}
if (str_startswith(args->argv[i], "-L")) {
continue;
}
/* When using the preprocessor, some arguments don't contribute
to the hash. The theory is that these arguments will change
the output of -E if they are going to have any effect at
all. For precompiled headers this might not be the case. */
if (!direct_mode && !output_is_precompiled_header
&& !using_precompiled_header) {
if (compopt_affects_cpp(args->argv[i])) {
i++;
continue;
}
if (compopt_short(compopt_affects_cpp, args->argv[i])) {
continue;
}
}
if (str_startswith(args->argv[i], "--specs=") &&
stat(args->argv[i] + 8, &st) == 0) {
/* If given a explicit specs file, then hash that file,
but don't include the path to it in the hash. */
hash_delimiter(hash, "specs");
if (!hash_file(hash, args->argv[i] + 8)) {
failed();
}
continue;
}
/* All other arguments are included in the hash. */
hash_delimiter(hash, "arg");
hash_string(hash, args->argv[i]);