gcc-uClibc.c 12 KB

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  1. /*
  2. * Copyright (C) 2000 Manuel Novoa III
  3. * Copyright (C) 2002 Erik Andersen
  4. *
  5. * This is a crude wrapper to use uClibc with gcc.
  6. * It was originally written to work around ./configure for ext2fs-utils.
  7. * It certainly can be improved, but it works for me in the normal cases.
  8. *
  9. * April 7, 2001
  10. *
  11. * A bug was fixed in building the gcc command line when dynamic linking.
  12. * The functions dlopen, etc. now work. At this time, you must make sure
  13. * the correct libdl.so is included however. It is safest to, for example,
  14. * add /lib/libdl.so.1 if using ld-linux.so.1 rather than adding -ldl to the
  15. * command line.
  16. *
  17. * Note: This is only a problem if devel and target archs are the same. To
  18. * avoid the problem, you can use a customized dynamic linker.
  19. *
  20. *
  21. * April 18, 2001
  22. *
  23. * The wrapper now works with either installed and uninstalled uClibc versions.
  24. * If you want to use the uninstalled header files and libs, either include
  25. * the string "build" in the invocation name such as
  26. * 'ln -s <ARCH>-uclibc-gcc <ARCH>-uclibc-gcc-build'
  27. * or include it in the environment variable setting of UCLIBC_GCC.
  28. * Note: This automatically enables the "rpath" behavior described below.
  29. *
  30. * The wrapper will now pass the location of the uClibc shared libs used to
  31. * the linker with the "-rpath" option if the invocation name includes the
  32. * string "rpath" or if the environment variable UCLIBC_GCC include it (as
  33. * with "build" above). This is primarily intended to be used on devel
  34. * platforms of the same arch as the target. A good place to use this feature
  35. * would be in the uClibc/test directory.
  36. *
  37. * The wrapper now displays the command line passed to gcc when '-v' is used.
  38. *
  39. * May 31, 2001
  40. *
  41. * "rpath" and "build" behavior are now decoupled. You can of course get
  42. * the old "build" behavior by setting UCLIBC_GCC="rpath-build". Order
  43. * isn't important here, as only the substrings are searched for.
  44. *
  45. * Added environment variable check for UCLIBC_GCC_DLOPT to let user specify
  46. * an alternative dynamic linker at runtime without using command line args.
  47. * Since this wouldn't commonly be used, I made it easy on myself. You have
  48. * to match the option you would have passed to the gcc wrapper. As an
  49. * example,
  50. *
  51. * export UCLIBC_GCC_DLOPT="-Wl,--dynamic-linker,/lib/ld-alt-linker.so.3"
  52. *
  53. * This is really only useful if target arch == devel arch and DEVEL_PREFIX
  54. * isn't empty. It involves a recompile, but you can at least test apps
  55. * on your devel system if combined with the "rpath" behavor if by using
  56. * LD_LIBRARY_PATH, etc.
  57. *
  58. * Also added check for "-Wl,--dynamic-linker" on the command line. The
  59. * use default dynamic linker or the envirnment-specified dynamic linker
  60. * is disabled in that case.
  61. *
  62. * Added options --uclibc-use-build-dir and --uclibc-use-rpath so that those
  63. * behaviors can be invoked from the command line.
  64. *
  65. */
  66. /*
  67. *
  68. * TODO:
  69. * Check/modify gcc-specific environment variables?
  70. */
  71. #include <stdio.h>
  72. #include <stdlib.h>
  73. #include <stdarg.h>
  74. #include <string.h>
  75. #include <unistd.h>
  76. #include <libgen.h>
  77. #include "gcc-uClibc.h"
  78. static char *our_usr_lib_path = "-L"UCLIBC_DEVEL_PREFIX"/lib";
  79. static char static_linking[] = "-static";
  80. static char nostdinc[] = "-nostdinc";
  81. static char nostdinc_plus[] = "-nostdinc++";
  82. static char nostartfiles[] = "-nostartfiles";
  83. static char nodefaultlibs[] = "-nodefaultlibs";
  84. static char nostdlib[] = "-nostdlib";
  85. extern void *xmalloc(size_t size)
  86. {
  87. void *ptr = malloc(size);
  88. if (!ptr) {
  89. fprintf(stderr, "memory exhausted");
  90. exit(EXIT_FAILURE);
  91. }
  92. return ptr;
  93. }
  94. void xstrcat(char **string, ...)
  95. {
  96. const char *c;
  97. va_list p;
  98. /* Don't bother to calculate how big exerything
  99. * will be, just be careful to not overflow... */
  100. va_start(p, string);
  101. *string = xmalloc(BUFSIZ);
  102. **string = '\0';
  103. while(1) {
  104. if (!(c = va_arg(p, const char *)))
  105. break;
  106. strcat(*string, c);
  107. }
  108. va_end(p);
  109. }
  110. int main(int argc, char **argv)
  111. {
  112. int use_build_dir = 0, linking = 1, use_static_linking = 0;
  113. int use_stdinc = 1, use_nostdinc_plus = 0, use_start = 1, use_stdlib = 1, use_pic = 0;
  114. int source_count = 0, use_rpath = 0, verbose = 0;
  115. int ctor_dtor = 1, cplusplus = 0;
  116. int i, j, k, l, m, n;
  117. char ** gcc_argv;
  118. char ** gcc_argument;
  119. char ** libraries;
  120. char ** libpath;
  121. char *dlstr;
  122. char *incstr;
  123. char *devprefix;
  124. char *builddir;
  125. char *libstr;
  126. char *build_dlstr;
  127. char *ep;
  128. char *rpath_link[2];
  129. char *rpath[2];
  130. char *uClibc_inc[2];
  131. char *our_lib_path[2];
  132. char *crt0_path[2];
  133. const char *application_name;
  134. char *crti_path[2];
  135. char *crtn_path[2];
  136. char *GPLUSPLUS_BIN = NULL;
  137. int len;
  138. application_name = basename(argv[0]);
  139. if (application_name[0] == '-')
  140. application_name++;
  141. /* We must use strstr since g++ might be named like a
  142. * cross compiler (i.e. arm-linux-g++). We must also
  143. * search carefully, in case we are searching something
  144. * like /opt/c++/gcc-3.1/bin/arm-linux-g++ or some similar
  145. * perversion... */
  146. len = strlen(application_name);
  147. if ((strcmp(application_name+len-3, "g++")==0) ||
  148. (strcmp(application_name+len-3, "c++")==0)) {
  149. char *gcc_bin = GCC_BIN;
  150. len = strlen(gcc_bin);
  151. if (strcmp(gcc_bin+len-3, "gcc")==0) {
  152. GPLUSPLUS_BIN = strdup(gcc_bin);
  153. GPLUSPLUS_BIN[len-1]='+';
  154. GPLUSPLUS_BIN[len-2]='+';
  155. }
  156. cplusplus = 1;
  157. use_nostdinc_plus = 1;
  158. }
  159. devprefix = getenv("UCLIBC_DEVEL_PREFIX");
  160. if (!devprefix) {
  161. devprefix = UCLIBC_DEVEL_PREFIX;
  162. }
  163. builddir = getenv("UCLIBC_BUILD_DIR");
  164. if (!builddir) {
  165. builddir = UCLIBC_BUILD_DIR;
  166. }
  167. incstr = getenv("UCLIBC_GCC_INC");
  168. libstr = getenv("UCLIBC_GCC_LIB");
  169. xstrcat(&(rpath_link[0]), "-Wl,-rpath-link,", devprefix, "/lib", NULL);
  170. xstrcat(&(rpath_link[1]), "-Wl,-rpath-link,", builddir, "/lib", NULL);
  171. xstrcat(&(rpath[0]), "-Wl,-rpath,", devprefix, "/lib", NULL);
  172. xstrcat(&(rpath[1]), "-Wl,-rpath,", builddir, "/lib", NULL);
  173. xstrcat(&(uClibc_inc[0]), devprefix, "/include/", NULL);
  174. xstrcat(&(uClibc_inc[1]), builddir, "/include/", NULL);
  175. xstrcat(&(crt0_path[0]), devprefix, "/lib/crt0.o", NULL);
  176. xstrcat(&(crt0_path[1]), builddir, "/lib/crt0.o", NULL);
  177. xstrcat(&(crti_path[0]), devprefix, "/lib/crti.o", NULL);
  178. xstrcat(&(crti_path[1]), builddir, "/lib/crti.o", NULL);
  179. xstrcat(&(crtn_path[0]), devprefix, "/lib/crtn.o", NULL);
  180. xstrcat(&(crtn_path[1]), builddir, "/lib/crtn.o", NULL);
  181. xstrcat(&(our_lib_path[0]), "-L", devprefix, "/lib", NULL);
  182. xstrcat(&(our_lib_path[1]), "-L", builddir, "/lib", NULL);
  183. build_dlstr = "-Wl,--dynamic-linker," BUILD_DYNAMIC_LINKER;
  184. dlstr = getenv("UCLIBC_GCC_DLOPT");
  185. if (!dlstr) {
  186. dlstr = "-Wl,--dynamic-linker," DYNAMIC_LINKER;
  187. }
  188. ep = getenv("UCLIBC_GCC");
  189. if (!ep) {
  190. ep = "";
  191. }
  192. if (strstr(ep,"build") != 0) {
  193. use_build_dir = 1;
  194. }
  195. if (strstr(ep,"rpath") != 0) {
  196. use_rpath = 1;
  197. }
  198. m = 0;
  199. libraries = __builtin_alloca(sizeof(char*) * (argc));
  200. libraries[m] = '\0';
  201. n = 0;
  202. libpath = __builtin_alloca(sizeof(char*) * (argc));
  203. libpath[n] = '\0';
  204. for ( i = 1 ; i < argc ; i++ ) {
  205. if (argv[i][0] == '-') { /* option */
  206. switch (argv[i][1]) {
  207. case 'c': /* compile or assemble */
  208. case 'S': /* generate assembler code */
  209. case 'E': /* preprocess only */
  210. case 'M': /* generate dependencies */
  211. linking = 0;
  212. break;
  213. case 'L': /* library */
  214. libpath[n++] = argv[i];
  215. libpath[n] = '\0';
  216. if (argv[i][2] == 0) {
  217. argv[i] = '\0';
  218. libpath[n++] = argv[++i];
  219. libpath[n] = '\0';
  220. }
  221. argv[i] = '\0';
  222. break;
  223. case 'l': /* library */
  224. libraries[m++] = argv[i];
  225. libraries[m] = '\0';
  226. argv[i] = '\0';
  227. break;
  228. case 'v': /* verbose */
  229. if (argv[i][2] == 0) verbose = 1;
  230. printf("Invoked as %s\n", argv[0]);
  231. break;
  232. case 'n':
  233. if (strcmp(nostdinc,argv[i]) == 0) {
  234. use_stdinc = 0;
  235. } else if (strcmp(nostartfiles,argv[i]) == 0) {
  236. use_start = 0;
  237. } else if (strcmp(nodefaultlibs,argv[i]) == 0) {
  238. use_stdlib = 0;
  239. argv[i] = '\0';
  240. } else if (strcmp(nostdlib,argv[i]) == 0) {
  241. use_start = 0;
  242. use_stdlib = 0;
  243. } else if (strcmp(nostdinc_plus,argv[i]) == 0) {
  244. if (cplusplus==1) {
  245. use_nostdinc_plus = 0;
  246. }
  247. }
  248. break;
  249. case 's':
  250. if (strstr(argv[i],static_linking) != NULL) {
  251. use_static_linking = 1;
  252. }
  253. break;
  254. case 'W': /* -static could be passed directly to ld */
  255. if (strncmp("-Wl,",argv[i],4) == 0) {
  256. if (strstr(argv[i],static_linking) != 0) {
  257. use_static_linking = 1;
  258. }
  259. if (strstr(argv[i],"--dynamic-linker") != 0) {
  260. dlstr = 0;
  261. }
  262. }
  263. break;
  264. case 'f':
  265. /* Check if we are doing PIC */
  266. if (strcmp("-fPIC",argv[i]) == 0) {
  267. use_pic = 1;
  268. } else if (strcmp("-fpic",argv[i]) == 0) {
  269. use_pic = 1;
  270. }
  271. break;
  272. case '-':
  273. if (strstr(argv[i]+1,static_linking) != NULL) {
  274. use_static_linking = 1;
  275. argv[i]='\0';
  276. } else if (strcmp("--uclibc-use-build-dir",argv[i]) == 0) {
  277. use_build_dir = 1;
  278. argv[i]='\0';
  279. } else if (strcmp("--uclibc-use-rpath",argv[i]) == 0) {
  280. use_rpath = 1;
  281. argv[i]='\0';
  282. } else if (strcmp("--uclibc-no-ctors",argv[i]) == 0) {
  283. ctor_dtor = 0;
  284. argv[i]='\0';
  285. }
  286. break;
  287. }
  288. } else { /* assume it is an existing source file */
  289. ++source_count;
  290. }
  291. }
  292. gcc_argv = __builtin_alloca(sizeof(char*) * (argc + 64));
  293. gcc_argument = __builtin_alloca(sizeof(char*) * (argc + 20));
  294. i = 0; k = 0;
  295. if (cplusplus && GPLUSPLUS_BIN)
  296. gcc_argv[i++] = GPLUSPLUS_BIN;
  297. else
  298. gcc_argv[i++] = GCC_BIN;
  299. for ( j = 1 ; j < argc ; j++ ) {
  300. if (argv[j]=='\0') {
  301. continue;
  302. } else {
  303. gcc_argument[k++] = argv[j];
  304. gcc_argument[k] = '\0';
  305. }
  306. }
  307. if (linking && source_count) {
  308. #if defined __HAVE_ELF__ && ! defined __UCLIBC_HAS_MMU__
  309. gcc_argv[i++] = "-Wl,-elf2flt";
  310. #endif
  311. gcc_argv[i++] = nostdlib;
  312. if (use_static_linking) {
  313. gcc_argv[i++] = static_linking;
  314. }
  315. if (!use_static_linking) {
  316. if (dlstr && use_build_dir) {
  317. gcc_argv[i++] = build_dlstr;
  318. } else if (dlstr) {
  319. gcc_argv[i++] = dlstr;
  320. }
  321. if (use_rpath) {
  322. gcc_argv[i++] = rpath[use_build_dir];
  323. }
  324. }
  325. for ( l = 0 ; l < n ; l++ ) {
  326. if (libpath[l]) gcc_argv[i++] = libpath[l];
  327. }
  328. gcc_argv[i++] = rpath_link[use_build_dir]; /* just to be safe */
  329. if( libstr )
  330. gcc_argv[i++] = libstr;
  331. gcc_argv[i++] = our_lib_path[use_build_dir];
  332. if (!use_build_dir) {
  333. gcc_argv[i++] = our_usr_lib_path;
  334. }
  335. }
  336. if (use_stdinc && source_count) {
  337. gcc_argv[i++] = nostdinc;
  338. if (cplusplus) {
  339. char *cppinc;
  340. if (use_nostdinc_plus) {
  341. gcc_argv[i++] = nostdinc_plus;
  342. }
  343. xstrcat(&cppinc, uClibc_inc[use_build_dir], "g++/", NULL);
  344. gcc_argv[i++] = "-isystem";
  345. gcc_argv[i++] = cppinc;
  346. xstrcat(&cppinc, uClibc_inc[use_build_dir], "g++-v3/", NULL);
  347. gcc_argv[i++] = "-isystem";
  348. gcc_argv[i++] = cppinc;
  349. }
  350. gcc_argv[i++] = "-isystem";
  351. gcc_argv[i++] = uClibc_inc[use_build_dir];
  352. gcc_argv[i++] = "-iwithprefix";
  353. gcc_argv[i++] = "include";
  354. if( incstr )
  355. gcc_argv[i++] = incstr;
  356. }
  357. if (linking && source_count) {
  358. if (use_start) {
  359. if (ctor_dtor) {
  360. gcc_argv[i++] = crti_path[use_build_dir];
  361. if (use_pic) {
  362. gcc_argv[i++] = LIBGCC_DIR "crtbeginS.o" ;
  363. } else {
  364. gcc_argv[i++] = LIBGCC_DIR "crtbegin.o" ;
  365. }
  366. }
  367. gcc_argv[i++] = crt0_path[use_build_dir];
  368. }
  369. for ( l = 0 ; l < k ; l++ ) {
  370. if (gcc_argument[l]) gcc_argv[i++] = gcc_argument[l];
  371. }
  372. if (use_stdlib) {
  373. //gcc_argv[i++] = "-Wl,--start-group";
  374. gcc_argv[i++] = "-lgcc";
  375. }
  376. for ( l = 0 ; l < m ; l++ ) {
  377. if (libraries[l]) gcc_argv[i++] = libraries[l];
  378. }
  379. if (use_stdlib) {
  380. if (cplusplus) {
  381. gcc_argv[ i++ ] = "-lstdc++";
  382. gcc_argv[ i++ ] = "-lm";
  383. }
  384. gcc_argv[i++] = "-lc";
  385. gcc_argv[i++] = "-lgcc";
  386. //gcc_argv[i++] = "-Wl,--end-group";
  387. }
  388. if (ctor_dtor) {
  389. if (use_pic) {
  390. gcc_argv[i++] = LIBGCC_DIR "crtendS.o" ;
  391. } else {
  392. gcc_argv[i++] = LIBGCC_DIR "crtend.o" ;
  393. }
  394. gcc_argv[i++] = crtn_path[use_build_dir];
  395. }
  396. } else {
  397. for ( l = 0 ; l < k ; l++ ) {
  398. if (gcc_argument[l]) gcc_argv[i++] = gcc_argument[l];
  399. }
  400. }
  401. gcc_argv[i++] = NULL;
  402. if (verbose) {
  403. for ( j = 0 ; gcc_argv[j] ; j++ ) {
  404. printf("arg[%2i] = %s\n", j, gcc_argv[j]);
  405. }
  406. fflush(stdout);
  407. }
  408. //no need to free memory from xstrcat because we never return...
  409. if (cplusplus && GPLUSPLUS_BIN)
  410. return execvp(GPLUSPLUS_BIN, gcc_argv);
  411. else
  412. return execvp(GCC_BIN, gcc_argv);
  413. }