diff options
Diffstat (limited to 'sys-devel/gcc-config/files/wrapper-1.5.1.c')
| -rw-r--r-- | sys-devel/gcc-config/files/wrapper-1.5.1.c | 372 |
1 files changed, 372 insertions, 0 deletions
diff --git a/sys-devel/gcc-config/files/wrapper-1.5.1.c b/sys-devel/gcc-config/files/wrapper-1.5.1.c new file mode 100644 index 000000000000..e2e80290b2df --- /dev/null +++ b/sys-devel/gcc-config/files/wrapper-1.5.1.c @@ -0,0 +1,372 @@ +/* + * Copyright 1999-2008 Gentoo Foundation + * Distributed under the terms of the GNU General Public License v2 + * $Id$ + * Author: Martin Schlemmer <azarah@gentoo.org> + * az's lackey: Mike Frysinger <vapier@gentoo.org> + */ + +#ifdef DEBUG +# define USE_DEBUG 1 +#else +# define USE_DEBUG 0 +#endif + +#include <errno.h> +#include <libgen.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/stat.h> +#include <sys/types.h> + +#define GCC_CONFIG "/usr/bin/gcc-config" +#define ENVD_BASE "/etc/env.d/05gcc" + +#define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0])) + +/* basename(3) is allowed to modify memory */ +#undef basename +#define basename(path) \ +({ \ + char *__path = path; \ + char *__ret = strrchr(__path, '/'); \ + __ret ? __ret + 1 : __path; \ +}) + +struct wrapper_data { + char *name, *fullname, *bin, *path; +}; + +static const struct { + char *alias; + char *target; +} wrapper_aliases[] = { + { "cc", "gcc" }, + { "f77", "g77" }, +}; + +#define wrapper_warn(fmt, ...) fprintf(stderr, "%s" fmt "\n", "gcc-config: ", ## __VA_ARGS__) +#define wrapper_err(fmt, ...) ({ wrapper_warn("%s" fmt, "error: ", ## __VA_ARGS__); exit(1); }) +#define wrapper_errp(fmt, ...) wrapper_err(fmt ": %s", ## __VA_ARGS__, strerror(errno)) +#define wrapper_dbg(fmt, ...) ({ if (USE_DEBUG) wrapper_warn(fmt, ## __VA_ARGS__); }) + +#define xmemwrap(func, proto, use) \ +static void *x ## func proto \ +{ \ + void *ret = func use; \ + if (!ret) \ + wrapper_err(#func "%s", ": out of memory"); \ + return ret; \ +} +xmemwrap(malloc, (size_t size), (size)) +xmemwrap(calloc, (size_t nemb, size_t size), (nemb, size)) +xmemwrap(strdup, (const char *s), (s)) + +/* check_for_target checks in path for the file we are seeking + * it returns 1 if found (with data->bin setup), 0 if not and + * negative on error + */ +static int check_for_target(char *path, struct wrapper_data *data) +{ + struct stat sbuf; + char str[PATH_MAX + 1]; + size_t path_len = strlen(path); + size_t len = path_len + strlen(data->name) + 2; + + if (sizeof(str) < len) + wrapper_warn("path too long: %s", path); + + strcpy(str, path); + str[path_len] = '/'; + str[path_len+1] = '\0'; + strcat(str, data->name); + + /* Stat possible file to check that + * 1) it exist and is a regular file, and + * 2) it is not the wrapper itself, and + * 3) it is in a /gcc-bin/ directory tree + */ + if (strcmp(str, data->fullname) != 0 && + strstr(str, "/gcc-bin/") != NULL && + stat(str, &sbuf) == 0 && + (S_ISREG(sbuf.st_mode) || S_ISLNK(sbuf.st_mode))) + { + wrapper_dbg("%s: found in %s", data->name, path); + data->bin = xstrdup(str); + return 1; + } + + wrapper_dbg("%s: did not find in %s", data->name, path); + return 0; +} + +static int find_target_in_path(struct wrapper_data *data) +{ + char *token = NULL, *state; + char *str; + + if (data->path == NULL) + return 0; + + /* Make a copy since strtok_r will modify path */ + str = xstrdup(data->path); + + /* Find the first file with suitable name in PATH. The idea here is + * that we do not want to bind ourselfs to something static like the + * default profile, or some odd environment variable, but want to be + * able to build something with a non default gcc by just tweaking + * the PATH ... */ + token = strtok_r(str, ":", &state); + while (token != NULL) { + if (check_for_target(token, data)) + return 1; + token = strtok_r(NULL, ":", &state); + } + + wrapper_dbg("%s: did not find in PATH", data->name); + return 0; +} + +/* find_target_in_envd parses /etc/env.d/05gcc, and tries to + * extract PATH, which is set to the current profile's bin + * directory ... + */ +static int find_target_in_envd(struct wrapper_data *data, int cross_compile) +{ + FILE *envfile = NULL; + char *token = NULL, *state; + char str[PATH_MAX + 1]; + char *strp = str; + char envd_file[PATH_MAX + 1]; + + if (!cross_compile) { + /* for the sake of speed, we'll keep a symlink around for + * the native compiler. #190260 + */ + snprintf(envd_file, sizeof(envd_file)-1, "/etc/env.d/gcc/.NATIVE"); + } else { + char *ctarget, *end = strrchr(data->name, '-'); + if (end == NULL) + return 0; + ctarget = xstrdup(data->name); + ctarget[end - data->name] = '\0'; + snprintf(envd_file, PATH_MAX, "%s-%s", ENVD_BASE, ctarget); + free(ctarget); + } + + envfile = fopen(envd_file, "r"); + if (envfile == NULL) + return 0; + + while (fgets(strp, PATH_MAX, envfile) != NULL) { + /* Keep reading ENVD_FILE until we get a line that + * starts with 'GCC_PATH=' ... keep 'PATH=' around + * for older gcc versions. + */ + if (strncmp(strp, "GCC_PATH=", strlen("GCC_PATH=")) && + strncmp(strp, "PATH=", strlen("PATH="))) + continue; + + token = strtok_r(strp, "=", &state); + if ((token != NULL) && token[0]) + /* The second token should be the value of PATH .. */ + token = strtok_r(NULL, "=", &state); + else + goto bail; + + if ((token != NULL) && token[0]) { + strp = token; + /* A bash variable may be unquoted, quoted with " or + * quoted with ', so extract the value without those .. + */ + token = strtok(strp, "\n\"\'"); + + while (token != NULL) { + if (check_for_target(token, data)) { + fclose(envfile); + return 1; + } + + token = strtok(NULL, "\n\"\'"); + } + } + + strp = str; + } + + bail: + fclose(envfile); + return (cross_compile ? 0 : find_target_in_envd(data, 1)); +} + +static void find_wrapper_target(struct wrapper_data *data) +{ + if (find_target_in_path(data)) + return; + + if (find_target_in_envd(data, 0)) + return; + + /* Only our wrapper is in PATH, so get the CC path using + * gcc-config and execute the real binary in there ... + */ + FILE *inpipe = popen(GCC_CONFIG " --get-bin-path", "r"); + if (inpipe == NULL) + wrapper_errp("could not open pipe"); + + char str[PATH_MAX + 1]; + if (fgets(str, PATH_MAX, inpipe) == 0) + wrapper_errp("could not get compiler binary path"); + + /* chomp! */ + size_t plen = strlen(str); + if (str[plen-1] == '\n') + str[plen-1] = '\0'; + + data->bin = xmalloc(plen + 1 + strlen(data->name) + 1); + sprintf(data->bin, "%s/%s", str, data->name); + + pclose(inpipe); +} + +/* This function modifies PATH to have gcc's bin path appended */ +static void modify_path(struct wrapper_data *data) +{ + char *newpath = NULL, *token = NULL, *state; + char dname_data[PATH_MAX + 1], str[PATH_MAX + 1]; + char *str2 = dname_data, *dname = dname_data; + size_t len = 0; + + if (data->bin == NULL) + return; + + if (data->path == NULL) + return; + + snprintf(str2, PATH_MAX + 1, "%s", data->bin); + + if ((dname = dirname(str2)) == NULL) + return; + + /* Make a copy since strtok_r will modify path */ + snprintf(str, PATH_MAX + 1, "%s", data->path); + + token = strtok_r(str, ":", &state); + + /* Check if we already appended our bin location to PATH */ + if ((token != NULL) && token[0]) + if (!strcmp(token, dname)) + return; + + len = strlen(dname) + strlen(data->path) + 2 + strlen("PATH") + 1; + + newpath = xmalloc(len); + memset(newpath, 0, len); + + snprintf(newpath, len, "PATH=%s:%s", dname, data->path); + putenv(newpath); +} + +static char *abi_flags[] = { + "-m32", "-m64", "-mabi", +}; +static char **build_new_argv(char **argv, const char *newflags_str) +{ +#define MAX_NEWFLAGS 32 + char *newflags[MAX_NEWFLAGS]; + char **retargv; + unsigned int argc, i; + char *state, *flags_tokenized; + + retargv = argv; + + /* make sure user hasn't specified any ABI flags already ... + * if they have, lets just get out of here ... this of course + * is by no means complete, it's merely a hack that works most + * of the time ... + */ + for (argc = 0; argv[argc]; ++argc) + for (i = 0; i < ARRAY_SIZE(abi_flags); ++i) + if (!strncmp(argv[argc], abi_flags[i], strlen(abi_flags[i]))) + return retargv; + + /* Tokenize the flag list and put it into newflags array */ + flags_tokenized = xstrdup(newflags_str); + i = 0; + newflags[i] = strtok_r(flags_tokenized, " \t\n", &state); + while (newflags[i] != NULL && i < MAX_NEWFLAGS-1) + newflags[++i] = strtok_r(NULL, " \t\n", &state); + + /* allocate memory for our spiffy new argv */ + retargv = xcalloc(argc + i + 1, sizeof(char*)); + /* start building retargv */ + retargv[0] = argv[0]; + /* insert the ABI flags first so cmdline always overrides ABI flags */ + memcpy(retargv+1, newflags, i * sizeof(char*)); + /* copy over the old argv */ + if (argc > 1) + memcpy(retargv+1+i, argv+1, (argc-1) * sizeof(char*)); + + return retargv; +} + +int main(int argc, char *argv[]) +{ + struct wrapper_data data; + + memset(&data, 0, sizeof(data)); + + if (getenv("PATH")) + data.path = xstrdup(getenv("PATH")); + + /* What should we find ? */ + data.name = basename(argv[0]); + + /* Allow for common compiler names like cc->gcc */ + size_t i; + for (i = 0; i < ARRAY_SIZE(wrapper_aliases); ++i) + if (!strcmp(data.name, wrapper_aliases[i].alias)) + data.name = wrapper_aliases[i].target; + + /* What is the full name of our wrapper? */ + data.fullname = xmalloc(strlen(data.name) + sizeof("/usr/bin/") + 1); + sprintf(data.fullname, "/usr/bin/%s", data.name); + + find_wrapper_target(&data); + + modify_path(&data); + + free(data.path); + data.path = NULL; + + /* Set argv[0] to the correct binary, else gcc can't find internal headers + * http://bugs.gentoo.org/8132 + */ + argv[0] = data.bin; + + /* If $ABI is in env, add appropriate env flags */ + char **newargv = argv; + if (getenv("ABI")) { + char envvar[50]; + + /* We use CFLAGS_${ABI} for gcc, g++, g77, etc as the flags that would + * be in there are the same no matter which compiler we are using. + */ + snprintf(envvar, sizeof(envvar), "CFLAGS_%s", getenv("ABI")); + envvar[sizeof(envvar)-1] = '\0'; + + if (getenv(envvar)) + newargv = build_new_argv(argv, getenv(envvar)); + } + + /* Ok, lets do it one more time ... */ + execv(data.bin, newargv); + + /* shouldn't have made it here if things worked ... */ + wrapper_err("could not run/locate '%s'", data.name); + + return 123; +} |