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authorBlackNoxis <steven.darklight@gmail.com>2015-03-30 13:47:12 +0300
committerBlackNoxis <steven.darklight@gmail.com>2015-03-30 13:47:12 +0300
commitad68a9758d804cef0c8f81983e59ff66273dce52 (patch)
treefae0389ca72a4a7b5904ee9699424b76f63f5b6a /sys-devel/gcc-config/files/wrapper-1.5.2.c
parentc7785ce0079f0de1b9dfcdb7ed3bfad78bad8c4a (diff)
[sys-devel/gcc-config] added systemd-oriented patch
Diffstat (limited to 'sys-devel/gcc-config/files/wrapper-1.5.2.c')
-rw-r--r--sys-devel/gcc-config/files/wrapper-1.5.2.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/sys-devel/gcc-config/files/wrapper-1.5.2.c b/sys-devel/gcc-config/files/wrapper-1.5.2.c
new file mode 100644
index 00000000..ca1e84fb
--- /dev/null
+++ b/sys-devel/gcc-config/files/wrapper-1.5.2.c
@@ -0,0 +1,315 @@
+/*
+ * Copyright 1999-2011 Gentoo Foundation
+ * Distributed under the terms of the GNU General Public License v2
+ * $Header: /var/cvsroot/gentoo-x86/sys-devel/gcc-config/files/wrapper-1.5.2.c,v 1.2 2011/06/18 18:46:23 vapier Exp $
+ * 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 {
+ const char *name;
+ char *fullname, *bin, *path;
+};
+
+static const struct {
+ const char *alias;
+ const char *target;
+} wrapper_aliases[] = {
+ { "cc", "gcc" },
+ { "f77", "gfortran" },
+ { "f95", "gfortran" },
+};
+
+#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(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 = NULL;
+ 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);
+}
+
+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;
+
+ /* Ok, lets do it one more time ... */
+ execv(data.bin, argv);
+
+ /* shouldn't have made it here if things worked ... */
+ wrapper_err("could not run/locate '%s'", data.name);
+
+ return 123;
+}