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- /**
- * Buildroot wrapper for toolchains. This simply executes the real toolchain
- * with a number of arguments (sysroot/arch/..) hardcoded, to ensure the
- * toolchain uses the correct configuration.
- * The hardcoded path arguments are defined relative to the actual location
- * of the binary.
- *
- * (C) 2011 Peter Korsgaard <jacmet@sunsite.dk>
- * (C) 2011 Daniel Nyström <daniel.nystrom@timeterminal.se>
- * (C) 2012 Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
- * (C) 2013 Spenser Gilliland <spenser@gillilanding.com>
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2. This program is licensed "as is" without any warranty of any
- * kind, whether express or implied.
- */
- #define _GNU_SOURCE
- #include <stdio.h>
- #include <string.h>
- #include <limits.h>
- #include <unistd.h>
- #include <stdlib.h>
- #include <errno.h>
- #ifdef BR_CCACHE
- static char ccache_path[PATH_MAX];
- #endif
- static char path[PATH_MAX];
- static char sysroot[PATH_MAX];
- /**
- * GCC errors out with certain combinations of arguments (examples are
- * -mfloat-abi={hard|soft} and -m{little|big}-endian), so we have to ensure
- * that we only pass the predefined one to the real compiler if the inverse
- * option isn't in the argument list.
- * This specifies the worst case number of extra arguments we might pass
- * Currently, we have:
- * -mfloat-abi=
- * -march=
- * -mcpu=
- */
- #define EXCLUSIVE_ARGS 3
- static char *predef_args[] = {
- #ifdef BR_CCACHE
- ccache_path,
- #endif
- path,
- "--sysroot", sysroot,
- #ifdef BR_ABI
- "-mabi=" BR_ABI,
- #endif
- #ifdef BR_FPU
- "-mfpu=" BR_FPU,
- #endif
- #ifdef BR_SOFTFLOAT
- "-msoft-float",
- #endif /* BR_SOFTFLOAT */
- #ifdef BR_MODE
- "-m" BR_MODE,
- #endif
- #ifdef BR_64
- "-m64",
- #endif
- #ifdef BR_OMIT_LOCK_PREFIX
- "-Wa,-momit-lock-prefix=yes",
- #endif
- #ifdef BR_BINFMT_FLAT
- "-Wl,-elf2flt",
- #endif
- #ifdef BR_MIPS_TARGET_LITTLE_ENDIAN
- "-EL",
- #endif
- #if defined(BR_MIPS_TARGET_BIG_ENDIAN) || defined(BR_ARC_TARGET_BIG_ENDIAN)
- "-EB",
- #endif
- #ifdef BR_ADDITIONAL_CFLAGS
- BR_ADDITIONAL_CFLAGS
- #endif
- };
- static void check_unsafe_path(const char *path, int paranoid)
- {
- char **c;
- static char *unsafe_paths[] = {
- "/lib", "/usr/include", "/usr/lib", "/usr/local/include", "/usr/local/lib", NULL,
- };
- for (c = unsafe_paths; *c != NULL; c++) {
- if (!strncmp(path, *c, strlen(*c))) {
- fprintf(stderr, "%s: %s: unsafe header/library path used in cross-compilation: '%s'\n",
- program_invocation_short_name,
- paranoid ? "ERROR" : "WARNING", path);
- if (paranoid)
- exit(1);
- continue;
- }
- }
- }
- int main(int argc, char **argv)
- {
- char **args, **cur, **exec_args;
- char *relbasedir, *absbasedir;
- char *progpath = argv[0];
- char *basename;
- char *env_debug;
- char *paranoid_wrapper;
- int paranoid;
- int ret, i, count = 0, debug;
- /* Calculate the relative paths */
- basename = strrchr(progpath, '/');
- if (basename) {
- *basename = '\0';
- basename++;
- relbasedir = malloc(strlen(progpath) + 7);
- if (relbasedir == NULL) {
- perror(__FILE__ ": malloc");
- return 2;
- }
- sprintf(relbasedir, "%s/../..", argv[0]);
- absbasedir = realpath(relbasedir, NULL);
- } else {
- basename = progpath;
- absbasedir = malloc(PATH_MAX + 1);
- ret = readlink("/proc/self/exe", absbasedir, PATH_MAX);
- if (ret < 0) {
- perror(__FILE__ ": readlink");
- return 2;
- }
- absbasedir[ret] = '\0';
- for (i = ret; i > 0; i--) {
- if (absbasedir[i] == '/') {
- absbasedir[i] = '\0';
- if (++count == 3)
- break;
- }
- }
- }
- if (absbasedir == NULL) {
- perror(__FILE__ ": realpath");
- return 2;
- }
- /* Fill in the relative paths */
- #ifdef BR_CROSS_PATH_REL
- ret = snprintf(path, sizeof(path), "%s/" BR_CROSS_PATH_REL "/%s" BR_CROSS_PATH_SUFFIX, absbasedir, basename);
- #elif defined(BR_CROSS_PATH_ABS)
- ret = snprintf(path, sizeof(path), BR_CROSS_PATH_ABS "/%s" BR_CROSS_PATH_SUFFIX, basename);
- #else
- ret = snprintf(path, sizeof(path), "%s/usr/bin/%s" BR_CROSS_PATH_SUFFIX, absbasedir, basename);
- #endif
- if (ret >= sizeof(path)) {
- perror(__FILE__ ": overflow");
- return 3;
- }
- #ifdef BR_CCACHE
- ret = snprintf(ccache_path, sizeof(ccache_path), "%s/usr/bin/ccache", absbasedir);
- if (ret >= sizeof(ccache_path)) {
- perror(__FILE__ ": overflow");
- return 3;
- }
- #endif
- ret = snprintf(sysroot, sizeof(sysroot), "%s/" BR_SYSROOT, absbasedir);
- if (ret >= sizeof(sysroot)) {
- perror(__FILE__ ": overflow");
- return 3;
- }
- cur = args = malloc(sizeof(predef_args) +
- (sizeof(char *) * (argc + EXCLUSIVE_ARGS)));
- if (args == NULL) {
- perror(__FILE__ ": malloc");
- return 2;
- }
- /* start with predefined args */
- memcpy(cur, predef_args, sizeof(predef_args));
- cur += sizeof(predef_args) / sizeof(predef_args[0]);
- #ifdef BR_FLOAT_ABI
- /* add float abi if not overridden in args */
- for (i = 1; i < argc; i++) {
- if (!strncmp(argv[i], "-mfloat-abi=", strlen("-mfloat-abi=")) ||
- !strcmp(argv[i], "-msoft-float") ||
- !strcmp(argv[i], "-mhard-float"))
- break;
- }
- if (i == argc)
- *cur++ = "-mfloat-abi=" BR_FLOAT_ABI;
- #endif
- #if defined(BR_ARCH) || \
- defined(BR_CPU)
- /* Add our -march/cpu flags, but only if none of
- * -march/mtune/mcpu are already specified on the commandline
- */
- for (i = 1; i < argc; i++) {
- if (!strncmp(argv[i], "-march=", strlen("-march=")) ||
- !strncmp(argv[i], "-mtune=", strlen("-mtune=")) ||
- !strncmp(argv[i], "-mcpu=", strlen("-mcpu=" )))
- break;
- }
- if (i == argc) {
- #ifdef BR_ARCH
- *cur++ = "-march=" BR_ARCH;
- #endif
- #ifdef BR_CPU
- *cur++ = "-mcpu=" BR_CPU;
- #endif
- }
- #endif /* ARCH || CPU */
- paranoid_wrapper = getenv("BR_COMPILER_PARANOID_UNSAFE_PATH");
- if (paranoid_wrapper && strlen(paranoid_wrapper) > 0)
- paranoid = 1;
- else
- paranoid = 0;
- /* Check for unsafe library and header paths */
- for (i = 1; i < argc; i++) {
- /* Skip options that do not start with -I and -L */
- if (strncmp(argv[i], "-I", 2) && strncmp(argv[i], "-L", 2))
- continue;
- /* We handle two cases: first the case where -I/-L and
- * the path are separated by one space and therefore
- * visible as two separate options, and then the case
- * where they are stuck together forming one single
- * option.
- */
- if (argv[i][2] == '\0') {
- i++;
- if (i == argc)
- continue;
- check_unsafe_path(argv[i], paranoid);
- } else {
- check_unsafe_path(argv[i] + 2, paranoid);
- }
- }
- /* append forward args */
- memcpy(cur, &argv[1], sizeof(char *) * (argc - 1));
- cur += argc - 1;
- /* finish with NULL termination */
- *cur = NULL;
- exec_args = args;
- #ifdef BR_CCACHE
- if (getenv("BR_NO_CCACHE"))
- /* Skip the ccache call */
- exec_args++;
- #endif
- /* Debug the wrapper to see actual arguments passed to
- * the compiler:
- * unset, empty, or 0: do not trace
- * set to 1 : trace all arguments on a single line
- * set to 2 : trace one argument per line
- */
- if ((env_debug = getenv("BR2_DEBUG_WRAPPER"))) {
- debug = atoi(env_debug);
- if (debug > 0) {
- fprintf(stderr, "Toolchain wrapper executing:");
- #ifdef BR_CCACHE_HASH
- fprintf(stderr, "%sCCACHE_COMPILERCHECK='string:" BR_CCACHE_HASH "'",
- (debug == 2) ? "\n " : " ");
- #endif
- #ifdef BR_CCACHE_BASEDIR
- fprintf(stderr, "%sCCACHE_BASEDIR='" BR_CCACHE_BASEDIR "'",
- (debug == 2) ? "\n " : " ");
- #endif
- for (i = 0; exec_args[i]; i++)
- fprintf(stderr, "%s'%s'",
- (debug == 2) ? "\n " : " ", exec_args[i]);
- fprintf(stderr, "\n");
- }
- }
- #ifdef BR_CCACHE_HASH
- /* Allow compilercheck to be overridden through the environment */
- if (setenv("CCACHE_COMPILERCHECK", "string:" BR_CCACHE_HASH, 0)) {
- perror(__FILE__ ": Failed to set CCACHE_COMPILERCHECK");
- return 3;
- }
- #endif
- #ifdef BR_CCACHE_BASEDIR
- /* Allow compilercheck to be overridden through the environment */
- if (setenv("CCACHE_BASEDIR", BR_CCACHE_BASEDIR, 0)) {
- perror(__FILE__ ": Failed to set CCACHE_BASEDIR");
- return 3;
- }
- #endif
- if (execv(exec_args[0], exec_args))
- perror(path);
- free(args);
- return 2;
- }
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