befb9a3ee0
The external toolchain wrapper sets sysroot etc. to an absolute path. By changing this to a relative path, it is possible to move the host directory to a different location and still have a working build system. This only works for a downloaded external toolchain. For a pre-installed external toolchain, it is possible to move the host directory to a different location, but not the external toolchain directory (it does work if the external toolchain directory lies within the host directory). For an internal or crosstool-ng toolchain, there is no wrapper so updating the sysroot path should be done in a different way. See http://lists.busybox.net/pipermail/buildroot/2012-February/050371.html for information about others things to do to make the host directory relocatable. Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Acked-by: Samuel Martin <s.martin49@gmail.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/**
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* Buildroot wrapper for external toolchains. This simply executes the real
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* toolchain with a number of arguments (sysroot/arch/..) hardcoded,
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* to ensure the external toolchain uses the correct configuration.
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* The hardcoded path arguments are defined relative to the actual location
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* of the binary.
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*
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* (C) 2011 Peter Korsgaard <jacmet@sunsite.dk>
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* (C) 2011 Daniel Nyström <daniel.nystrom@timeterminal.se>
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* (C) 2012 Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include <unistd.h>
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#include <stdlib.h>
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static char path[PATH_MAX];
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static char sysroot[PATH_MAX];
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static char *predef_args[] = {
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path,
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"--sysroot", sysroot,
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#ifdef BR_ARCH
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"-march=" BR_ARCH,
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#endif /* BR_ARCH */
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#ifdef BR_TUNE
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"-mtune=" BR_TUNE,
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#endif /* BR_TUNE */
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#ifdef BR_CPU
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"-mcpu=" BR_CPU,
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#endif
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#ifdef BR_ABI
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"-mabi=" BR_ABI,
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#endif
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#ifdef BR_SOFTFLOAT
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"-msoft-float",
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#endif /* BR_SOFTFLOAT */
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#ifdef BR_VFPFLOAT
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"-mfpu=vfp",
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#endif /* BR_VFPFLOAT */
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#ifdef BR_64
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"-m64",
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#endif
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#ifdef BR_ADDITIONAL_CFLAGS
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BR_ADDITIONAL_CFLAGS
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#endif
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};
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int main(int argc, char **argv)
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{
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char **args, **cur;
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char *relbasedir, *absbasedir;
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char *progpath = argv[0];
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char *basename;
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int ret;
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/* Calculate the relative paths */
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basename = strrchr(progpath, '/');
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if (basename) {
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*basename = '\0';
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basename++;
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relbasedir = malloc(strlen(progpath) + 7);
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if (relbasedir == NULL) {
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perror(__FILE__ ": malloc");
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return 2;
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}
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sprintf(relbasedir, "%s/../..", argv[0]);
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absbasedir = realpath(relbasedir, NULL);
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} else {
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basename = progpath;
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absbasedir = realpath("../..", NULL);
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}
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if (absbasedir == NULL) {
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perror(__FILE__ ": realpath");
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return 2;
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}
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/* Fill in the relative paths */
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#ifdef BR_CROSS_PATH_REL
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ret = snprintf(path, sizeof(path), "%s/" BR_CROSS_PATH_REL "/%s", absbasedir, basename);
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#else /* BR_CROSS_PATH_ABS */
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ret = snprintf(path, sizeof(path), BR_CROSS_PATH_ABS "/%s", basename);
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#endif
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if (ret >= sizeof(path)) {
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perror(__FILE__ ": overflow");
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return 3;
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}
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ret = snprintf(sysroot, sizeof(sysroot), "%s/" BR_SYSROOT, absbasedir);
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if (ret >= sizeof(sysroot)) {
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perror(__FILE__ ": overflow");
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return 3;
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}
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cur = args = malloc(sizeof(predef_args) + (sizeof(char *) * argc));
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if (args == NULL) {
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perror(__FILE__ ": malloc");
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return 2;
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}
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/* start with predefined args */
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memcpy(cur, predef_args, sizeof(predef_args));
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cur += sizeof(predef_args) / sizeof(predef_args[0]);
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/* append forward args */
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memcpy(cur, &argv[1], sizeof(char *) * (argc - 1));
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cur += argc - 1;
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/* finish with NULL termination */
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*cur = NULL;
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if (execv(path, args))
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perror(path);
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free(args);
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return 2;
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}
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