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/**
* Buildroot wrapper for external toolchains. This simply executes the real
* toolchain with a number of arguments (sysroot/arch/..) hardcoded,
* to ensure the external 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.
*/
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <stdlib.h>
static char path[PATH_MAX];
static char sysroot[PATH_MAX];
/**
* GCC errors out with certain combinations of arguments (examples are
* -mabi-float={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
*/
#define EXCLUSIVE_ARGS 1
static char *predef_args[] = {
path,
"--sysroot", sysroot,
#ifdef BR_ARCH
"-march=" BR_ARCH,
#endif /* BR_ARCH */
#ifdef BR_TUNE
"-mtune=" BR_TUNE,
#endif /* BR_TUNE */
#ifdef BR_CPU
"-mcpu=" BR_CPU,
#endif
#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_BINFMT_FLAT
"-Wl,-elf2flt",
#endif
#ifdef BR_ADDITIONAL_CFLAGS
BR_ADDITIONAL_CFLAGS
#endif
};
int main(int argc, char **argv)
{
char **args, **cur;
char *relbasedir, *absbasedir;
char *progpath = argv[0];
char *basename;
char *env_debug;
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", absbasedir, basename);
#else /* BR_CROSS_PATH_ABS */
ret = snprintf(path, sizeof(path), BR_CROSS_PATH_ABS "/%s", basename);
#endif
if (ret >= sizeof(path)) {
perror(__FILE__ ": overflow");
return 3;
}
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
/* append forward args */
memcpy(cur, &argv[1], sizeof(char *) * (argc - 1));
cur += argc - 1;
/* finish with NULL termination */
*cur = NULL;
/* 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("BR_DEBUG_WRAPPER"))) {
debug = atoi(env_debug);
if (debug > 0) {
fprintf(stderr, "Toolchain wrapper executing:");
for (i = 0; args[i]; i++)
fprintf(stderr, "%s'%s'",
(debug == 2)?"\n ":" ", args[i]);
fprintf(stderr, "\n");
}
}
if (execv(path, args))
perror(path);
free(args);
return 2;
}
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