[sys-devel/gcc-config] added systemd-oriented patch

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;
+}