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- /*
- * Copyright (C) 2000 Manuel Novoa III
- * Copyright (C) 2002 Erik Andersen
- *
- * This is a crude wrapper to use uClibc with gcc.
- * It was originally written to work around ./configure for ext2fs-utils.
- * It certainly can be improved, but it works for me in the normal cases.
- *
- * April 7, 2001
- *
- * A bug was fixed in building the gcc command line when dynamic linking.
- * The functions dlopen, etc. now work. At this time, you must make sure
- * the correct libdl.so is included however. It is safest to, for example,
- * add /lib/libdl.so.1 if using ld-linux.so.1 rather than adding -ldl to the
- * command line.
- *
- * Note: This is only a problem if devel and target archs are the same. To
- * avoid the problem, you can use a customized dynamic linker.
- *
- *
- * April 18, 2001
- *
- * The wrapper now works with either installed and uninstalled uClibc versions.
- * If you want to use the uninstalled header files and libs, either include
- * the string "build" in the invocation name such as
- * 'ln -s <ARCH>-uclibc-gcc <ARCH>-uclibc-gcc-build'
- * or include it in the environment variable setting of UCLIBC_GCC.
- * Note: This automatically enables the "rpath" behavior described below.
- *
- * The wrapper will now pass the location of the uClibc shared libs used to
- * the linker with the "-rpath" option if the invocation name includes the
- * string "rpath" or if the environment variable UCLIBC_GCC include it (as
- * with "build" above). This is primarily intended to be used on devel
- * platforms of the same arch as the target. A good place to use this feature
- * would be in the uClibc/test directory.
- *
- * The wrapper now displays the command line passed to gcc when '-v' is used.
- *
- * May 31, 2001
- *
- * "rpath" and "build" behavior are now decoupled. You can of course get
- * the old "build" behavior by setting UCLIBC_GCC="rpath-build". Order
- * isn't important here, as only the substrings are searched for.
- *
- * Added environment variable check for UCLIBC_GCC_DLOPT to let user specify
- * an alternative dynamic linker at runtime without using command line args.
- * Since this wouldn't commonly be used, I made it easy on myself. You have
- * to match the option you would have passed to the gcc wrapper. As an
- * example,
- *
- * export UCLIBC_GCC_DLOPT="-Wl,--dynamic-linker,/lib/ld-alt-linker.so.3"
- *
- * This is really only useful if target arch == devel arch and DEVEL_PREFIX
- * isn't empty. It involves a recompile, but you can at least test apps
- * on your devel system if combined with the "rpath" behavor if by using
- * LD_LIBRARY_PATH, etc.
- *
- * Also added check for "-Wl,--dynamic-linker" on the command line. The
- * use default dynamic linker or the envirnment-specified dynamic linker
- * is disabled in that case.
- *
- * Added options --uclibc-use-build-dir and --uclibc-use-rpath so that those
- * behaviors can be invoked from the command line.
- *
- */
- /*
- *
- * TODO:
- * Check/modify gcc-specific environment variables?
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <stdarg.h>
- #include <string.h>
- #include <unistd.h>
- #include <libgen.h>
- #include "gcc-uClibc.h"
- static char *our_usr_lib_path = "-L"UCLIBC_DEVEL_PREFIX"/lib";
- static char static_linking[] = "-static";
- static char nostdinc[] = "-nostdinc";
- static char nostdinc_plus[] = "-nostdinc++";
- static char nostartfiles[] = "-nostartfiles";
- static char nodefaultlibs[] = "-nodefaultlibs";
- static char nostdlib[] = "-nostdlib";
- extern void *xmalloc(size_t size)
- {
- void *ptr = malloc(size);
- if (!ptr) {
- fprintf(stderr, "memory exhausted");
- exit(EXIT_FAILURE);
- }
- return ptr;
- }
- void xstrcat(char **string, ...)
- {
- const char *c;
- va_list p;
- /* Don't bother to calculate how big exerything
- * will be, just be careful to not overflow... */
- va_start(p, string);
- *string = xmalloc(BUFSIZ);
- **string = '\0';
- while(1) {
- if (!(c = va_arg(p, const char *)))
- break;
- strcat(*string, c);
- }
- va_end(p);
- }
- int main(int argc, char **argv)
- {
- int use_build_dir = 0, linking = 1, use_static_linking = 0;
- int use_stdinc = 1, use_nostdinc_plus = 0, use_start = 1, use_stdlib = 1, use_pic = 0;
- int source_count = 0, use_rpath = 0, verbose = 0;
- int ctor_dtor = 1, cplusplus = 0;
- int i, j, k, l, m, n;
- char ** gcc_argv;
- char ** gcc_argument;
- char ** libraries;
- char ** libpath;
- char *dlstr;
- char *incstr;
- char *devprefix;
- char *builddir;
- char *libstr;
- char *build_dlstr;
- char *ep;
- char *rpath_link[2];
- char *rpath[2];
- char *uClibc_inc[2];
- char *our_lib_path[2];
- char *crt0_path[2];
- const char *application_name;
- char *crti_path[2];
- char *crtn_path[2];
- char *GPLUSPLUS_BIN = NULL;
- int len;
- application_name = basename(argv[0]);
- if (application_name[0] == '-')
- application_name++;
- /* We must use strstr since g++ might be named like a
- * cross compiler (i.e. arm-linux-g++). We must also
- * search carefully, in case we are searching something
- * like /opt/c++/gcc-3.1/bin/arm-linux-g++ or some similar
- * perversion... */
- len = strlen(application_name);
- if ((strcmp(application_name+len-3, "g++")==0) ||
- (strcmp(application_name+len-3, "c++")==0)) {
- char *gcc_bin = GCC_BIN;
- len = strlen(gcc_bin);
- if (strcmp(gcc_bin+len-3, "gcc")==0) {
- GPLUSPLUS_BIN = strdup(gcc_bin);
- GPLUSPLUS_BIN[len-1]='+';
- GPLUSPLUS_BIN[len-2]='+';
- }
- cplusplus = 1;
- use_nostdinc_plus = 1;
- }
- devprefix = getenv("UCLIBC_DEVEL_PREFIX");
- if (!devprefix) {
- devprefix = UCLIBC_DEVEL_PREFIX;
- }
- builddir = getenv("UCLIBC_BUILD_DIR");
- if (!builddir) {
- builddir = UCLIBC_BUILD_DIR;
- }
- incstr = getenv("UCLIBC_GCC_INC");
- libstr = getenv("UCLIBC_GCC_LIB");
- xstrcat(&(rpath_link[0]), "-Wl,-rpath-link,", devprefix, "/lib", NULL);
- xstrcat(&(rpath_link[1]), "-Wl,-rpath-link,", builddir, "/lib", NULL);
- xstrcat(&(rpath[0]), "-Wl,-rpath,", devprefix, "/lib", NULL);
- xstrcat(&(rpath[1]), "-Wl,-rpath,", builddir, "/lib", NULL);
- xstrcat(&(uClibc_inc[0]), devprefix, "/include/", NULL);
- xstrcat(&(uClibc_inc[1]), builddir, "/include/", NULL);
- xstrcat(&(crt0_path[0]), devprefix, "/lib/crt0.o", NULL);
- xstrcat(&(crt0_path[1]), builddir, "/lib/crt0.o", NULL);
- xstrcat(&(crti_path[0]), devprefix, "/lib/crti.o", NULL);
- xstrcat(&(crti_path[1]), builddir, "/lib/crti.o", NULL);
- xstrcat(&(crtn_path[0]), devprefix, "/lib/crtn.o", NULL);
- xstrcat(&(crtn_path[1]), builddir, "/lib/crtn.o", NULL);
- xstrcat(&(our_lib_path[0]), "-L", devprefix, "/lib", NULL);
- xstrcat(&(our_lib_path[1]), "-L", builddir, "/lib", NULL);
- build_dlstr = "-Wl,--dynamic-linker," BUILD_DYNAMIC_LINKER;
- dlstr = getenv("UCLIBC_GCC_DLOPT");
- if (!dlstr) {
- dlstr = "-Wl,--dynamic-linker," DYNAMIC_LINKER;
- }
- ep = getenv("UCLIBC_GCC");
- if (!ep) {
- ep = "";
- }
- if (strstr(ep,"build") != 0) {
- use_build_dir = 1;
- }
- if (strstr(ep,"rpath") != 0) {
- use_rpath = 1;
- }
- m = 0;
- libraries = __builtin_alloca(sizeof(char*) * (argc));
- libraries[m] = '\0';
- n = 0;
- libpath = __builtin_alloca(sizeof(char*) * (argc));
- libpath[n] = '\0';
- for ( i = 1 ; i < argc ; i++ ) {
- if (argv[i][0] == '-') { /* option */
- switch (argv[i][1]) {
- case 'c': /* compile or assemble */
- case 'S': /* generate assembler code */
- case 'E': /* preprocess only */
- case 'M': /* generate dependencies */
- linking = 0;
- break;
- case 'L': /* library */
- libpath[n++] = argv[i];
- libpath[n] = '\0';
- if (argv[i][2] == 0) {
- argv[i] = '\0';
- libpath[n++] = argv[++i];
- libpath[n] = '\0';
- }
- argv[i] = '\0';
- break;
- case 'l': /* library */
- libraries[m++] = argv[i];
- libraries[m] = '\0';
- argv[i] = '\0';
- break;
- case 'v': /* verbose */
- if (argv[i][2] == 0) verbose = 1;
- printf("Invoked as %s\n", argv[0]);
- break;
- case 'n':
- if (strcmp(nostdinc,argv[i]) == 0) {
- use_stdinc = 0;
- } else if (strcmp(nostartfiles,argv[i]) == 0) {
- use_start = 0;
- } else if (strcmp(nodefaultlibs,argv[i]) == 0) {
- use_stdlib = 0;
- argv[i] = '\0';
- } else if (strcmp(nostdlib,argv[i]) == 0) {
- use_start = 0;
- use_stdlib = 0;
- } else if (strcmp(nostdinc_plus,argv[i]) == 0) {
- if (cplusplus==1) {
- use_nostdinc_plus = 0;
- }
- }
- break;
- case 's':
- if (strstr(argv[i],static_linking) != NULL) {
- use_static_linking = 1;
- }
- break;
- case 'W': /* -static could be passed directly to ld */
- if (strncmp("-Wl,",argv[i],4) == 0) {
- if (strstr(argv[i],static_linking) != 0) {
- use_static_linking = 1;
- }
- if (strstr(argv[i],"--dynamic-linker") != 0) {
- dlstr = 0;
- }
- }
- break;
- case 'f':
- /* Check if we are doing PIC */
- if (strcmp("-fPIC",argv[i]) == 0) {
- use_pic = 1;
- } else if (strcmp("-fpic",argv[i]) == 0) {
- use_pic = 1;
- }
- break;
- case '-':
- if (strstr(argv[i]+1,static_linking) != NULL) {
- use_static_linking = 1;
- argv[i]='\0';
- } else if (strcmp("--uclibc-use-build-dir",argv[i]) == 0) {
- use_build_dir = 1;
- argv[i]='\0';
- } else if (strcmp("--uclibc-use-rpath",argv[i]) == 0) {
- use_rpath = 1;
- argv[i]='\0';
- } else if (strcmp("--uclibc-no-ctors",argv[i]) == 0) {
- ctor_dtor = 0;
- argv[i]='\0';
- }
- break;
- }
- } else { /* assume it is an existing source file */
- ++source_count;
- }
- }
- gcc_argv = __builtin_alloca(sizeof(char*) * (argc + 64));
- gcc_argument = __builtin_alloca(sizeof(char*) * (argc + 20));
- i = 0; k = 0;
- if (cplusplus && GPLUSPLUS_BIN)
- gcc_argv[i++] = GPLUSPLUS_BIN;
- else
- gcc_argv[i++] = GCC_BIN;
-
- for ( j = 1 ; j < argc ; j++ ) {
- if (argv[j]=='\0') {
- continue;
- } else {
- gcc_argument[k++] = argv[j];
- gcc_argument[k] = '\0';
- }
- }
- if (linking && source_count) {
- #if defined __HAVE_ELF__ && ! defined __UCLIBC_HAS_MMU__
- gcc_argv[i++] = "-Wl,-elf2flt";
- #endif
- gcc_argv[i++] = nostdlib;
- if (use_static_linking) {
- gcc_argv[i++] = static_linking;
- }
- if (!use_static_linking) {
- if (dlstr && use_build_dir) {
- gcc_argv[i++] = build_dlstr;
- } else if (dlstr) {
- gcc_argv[i++] = dlstr;
- }
- if (use_rpath) {
- gcc_argv[i++] = rpath[use_build_dir];
- }
- }
- for ( l = 0 ; l < n ; l++ ) {
- if (libpath[l]) gcc_argv[i++] = libpath[l];
- }
- gcc_argv[i++] = rpath_link[use_build_dir]; /* just to be safe */
- if( libstr )
- gcc_argv[i++] = libstr;
- gcc_argv[i++] = our_lib_path[use_build_dir];
- if (!use_build_dir) {
- gcc_argv[i++] = our_usr_lib_path;
- }
- }
- if (use_stdinc && source_count) {
- gcc_argv[i++] = nostdinc;
- if (cplusplus) {
- char *cppinc;
- if (use_nostdinc_plus) {
- gcc_argv[i++] = nostdinc_plus;
- }
- xstrcat(&cppinc, uClibc_inc[use_build_dir], "g++/", NULL);
- gcc_argv[i++] = "-isystem";
- gcc_argv[i++] = cppinc;
- xstrcat(&cppinc, uClibc_inc[use_build_dir], "g++-v3/", NULL);
- gcc_argv[i++] = "-isystem";
- gcc_argv[i++] = cppinc;
- }
- gcc_argv[i++] = "-isystem";
- gcc_argv[i++] = uClibc_inc[use_build_dir];
- gcc_argv[i++] = "-iwithprefix";
- gcc_argv[i++] = "include";
- if( incstr )
- gcc_argv[i++] = incstr;
- }
- if (linking && source_count) {
- if (use_start) {
- if (ctor_dtor) {
- gcc_argv[i++] = crti_path[use_build_dir];
- if (use_pic) {
- gcc_argv[i++] = GCC_LIB_DIR "crtbeginS.o" ;
- } else {
- gcc_argv[i++] = GCC_LIB_DIR "crtbegin.o" ;
- }
- }
- gcc_argv[i++] = crt0_path[use_build_dir];
- }
- for ( l = 0 ; l < k ; l++ ) {
- if (gcc_argument[l]) gcc_argv[i++] = gcc_argument[l];
- }
- if (use_stdlib) {
- //gcc_argv[i++] = "-Wl,--start-group";
- gcc_argv[i++] = "-lgcc";
- }
- for ( l = 0 ; l < m ; l++ ) {
- if (libraries[l]) gcc_argv[i++] = libraries[l];
- }
- if (use_stdlib) {
- if (cplusplus) {
- gcc_argv[ i++ ] = "-lstdc++";
- gcc_argv[ i++ ] = "-lm";
- }
- gcc_argv[i++] = "-lc";
- gcc_argv[i++] = "-lgcc";
- //gcc_argv[i++] = "-Wl,--end-group";
- }
- if (ctor_dtor) {
- if (use_pic) {
- gcc_argv[i++] = GCC_LIB_DIR "crtendS.o" ;
- } else {
- gcc_argv[i++] = GCC_LIB_DIR "crtend.o" ;
- }
- gcc_argv[i++] = crtn_path[use_build_dir];
- }
- } else {
- for ( l = 0 ; l < k ; l++ ) {
- if (gcc_argument[l]) gcc_argv[i++] = gcc_argument[l];
- }
- }
- gcc_argv[i++] = NULL;
- if (verbose) {
- for ( j = 0 ; gcc_argv[j] ; j++ ) {
- printf("arg[%2i] = %s\n", j, gcc_argv[j]);
- }
- fflush(stdout);
- }
- //no need to free memory from xstrcat because we never return...
- if (cplusplus && GPLUSPLUS_BIN)
- return execvp(GPLUSPLUS_BIN, gcc_argv);
- else
- return execvp(GCC_BIN, gcc_argv);
- }
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