[gentoo-commits] proj/gcc-config:master commit in: tests/rw-multi-native-configs/, tests/source/, ...

[gentoo-commits] proj/gcc-config:master commit in: tests/rw-multi-native-configs/, tests/source/, ...

[Sergei Trofimovich]

commit:     9b907ef80bc421df23515afc4c306e4d96c67649
Author:     Sergei Trofimovich <slyfox <AT> gentoo <DOT> org>
AuthorDate: Fri Aug 24 17:36:57 2018 +0000
Commit:     Sergei Trofimovich <slyfox <AT> gentoo <DOT> org>
CommitDate: Fri Aug 24 18:09:17 2018 +0000
URL:        https://gitweb.gentoo.org/proj/gcc-config.git/commit/?id=9b907ef8

Convert binary wrapper to a symlink wrapper.

Before the change:
   /usr/bin/gcc and friends were a copy of /usr/$(libexecdir)/misc/gcc-config
After the change:
   /usr/bin/gcc is a symlink to a real compiler binary. Examples:
       /usr/${CTARGET}/gcc-bin/${GCC_VER}/gcc (native)
       /usr/${CHOST}/${CTARGET}/gcc-bin/${GCC_VER}/gcc (cross)

gcc-config is a binary wrapper that does (or did) a few things:

- [removed in 2011] injects additional CFLAGS_${ABI}

  Removed in commit 7ac40f3eb8434961f70485247d883f5b3009dcf2
  "Stop auto appending CFLAGS_<abi> from the env."

- traverses PATH for real compiler binary and reexecutes it.

- reads /etc/env.d/05gcc-${CTARGET} as a fallback if PATH is empty.

Today binary wrapper does only PATH resolution and re-execution.

This change has a few minor benefits:

- PATH will not contain explicit /usr/${CHOST}/${CTARGET}/gcc-bin/${GCC_VER}
  entry. This will make PATH shorter for those who have mavy cross-compilers
  installed.

- compiler switch will not require sourcing '. /etc/profile' as changes are
  applied as soon an symlink is switched.

- ccache will see gcc binary changes directly and react accordingly.
  Previously in default configuration ccache cache depended on state of
  /usr/$(libexecdir)/misc/gcc-config

  See bug #640958 where ccache did not notice USE=-pie -> USE=pie switch.

- Reasoning about PATH ordering is straightforward: all available binaries
  (as symlinks) are in /usr/bin.

  See bug #255695 where PATH ordering changed and bug #626606 where
  people get confused on what is in /usr/bin/gcc binary.

Bug: https://bugs.gentoo.org/626606
Bug: https://bugs.gentoo.org/255695
Bug: https://bugs.gentoo.org/640958
Signed-off-by: Sergei Trofimovich <slyfox <AT> gentoo.org>

 .gitignore                                         |   3 -
 Makefile                                           |   8 +-
 README                                             |  69 +----
 gcc-config                                         |  33 +--
 tests/rw-multi-native-configs/test.select          |   4 +-
 .../usr/lib/gcc-config/wrapper                     |   0
 tests/source/test.whitespace                       |   2 +-
 wrapper.c                                          | 323 ---------------------
 8 files changed, 28 insertions(+), 414 deletions(-)

diff --git a/.gitignore b/.gitignore
index 23938ed..b79124b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,4 @@
-a.out
 *~
-*.o
 
 *.diff
 *.patch
@@ -10,4 +8,3 @@ a.out
 /gcc-config-*.tar.*
 
 /.gcc-config
-/wrapper

diff --git a/Makefile b/Makefile
index 3cbb915..3e9e5a3 100644
--- a/Makefile
+++ b/Makefile
@@ -13,16 +13,15 @@ BINDIR = $(PREFIX)/bin
 ESELECTDIR = $(PREFIX)/share/eselect/modules
 SUBLIBDIR = lib
 LIBDIR = $(PREFIX)/$(SUBLIBDIR)
-LIBEXECDIR = $(LIBDIR)/$(PN)
 
 MKDIR_P = mkdir -p -m 755
 INSTALL_EXE = install -m 755
 INSTALL_DATA = install -m 644
 
-all: .gcc-config wrapper
+all: .gcc-config
 
 clean:
-	rm -f .gcc-config wrapper *.o core
+	rm -f .gcc-config
 
 .gcc-config: gcc-config
 	sed \
@@ -34,8 +33,7 @@ clean:
 	chmod a+rx $@
 
 install: all
-	$(MKDIR_P) $(DESTDIR)$(BINDIR) $(DESTDIR)$(LIBEXECDIR) $(DESTDIR)$(ESELECTDIR)
-	$(INSTALL_EXE) wrapper $(DESTDIR)$(LIBEXECDIR)/wrapper
+	$(MKDIR_P) $(DESTDIR)$(BINDIR) $(DESTDIR)$(ESELECTDIR)
 	$(INSTALL_EXE) .gcc-config $(DESTDIR)$(BINDIR)/gcc-config
 	$(INSTALL_DATA) gcc.eselect $(DESTDIR)$(ESELECTDIR)
 

diff --git a/README b/README
index e7933d8..bea5e30 100644
--- a/README
+++ b/README
@@ -6,20 +6,18 @@ Gentoo allows switching gcc as system runs via gcc-config:
     $ gcc-config x86_64-pc-linux-gnu-7.2.0
 
 Ideally changes should be visible instantly and atomically
-without shell restart. Practically see TODOs and BUGs on PATH/ROOTPATH.
+without shell restart.
 
 Files, variables, things.
 -------------------------
 
-- Wrappers (copies of /usr/$(libexec)/gcc-config/wrapper)
-    /usr/bin/gcc
-    /usr/bin/g++
-    /usr/bin/${CTARGET}-gcc
+- Wrappers (symlinks to compiler binary like /usr/${CTARGET}/gcc-bin/${GCC_VERSION}/gcc)
+    /usr/bin/gcc (native)
+    /usr/bin/g++ (native)
+    /usr/bin/${CTARGET}-gcc (native and cross)
     ...
     (all files from /usr/${CTARGET}/gcc-bin/$GCC_VERSION/*)
 
-      Wrapper reads env config and re-execs binary from `GCC_PATH`.
-
       See `gcc-config` script for wrapping details.
 
 - private gcc configs (provided by `toolchain.eclass`, gcc ebuilds)
@@ -39,7 +37,6 @@ Files, variables, things.
           GCC_PATH="/usr/x86_64-pc-linux-gnu/gcc-bin/8.1.0"
 
       Used by gcc-config to generate wrappers and 05gcc- env.d files.
-      Used by wrapper to extract GCC_PATH and re-exec().
 
 - gcc env.d compiler entries (provided by gcc-config)
 
@@ -47,8 +44,6 @@ Files, variables, things.
 
       Populates paths for native-compilers
 
-        PATH="/usr/x86_64-pc-linux-gnu/gcc-bin/8.2.0"
-        ROOTPATH="/usr/x86_64-pc-linux-gnu/gcc-bin/8.2.0"
         GCC_SPECS=""
         MANPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/8.2.0/man"
         INFOPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/8.2.0/info"
@@ -57,60 +52,16 @@ Files, variables, things.
 
     /etc/env.d/05gcc-${CTARGET} (cross)
 
-      Populates paths for cross-compilers
-
-        PATH="/usr/x86_64-pc-linux-gnu/powerpc64le-unknown-linux-gnu/gcc-bin/7.3.0"
-        ROOTPATH="/usr/x86_64-pc-linux-gnu/powerpc64le-unknown-linux-gnu/gcc-bin/7.3.0"
-
-      Used by wrapper to extract PATH and re-exec().
-      Used by env-update to populate PATH (TODO: remove PATH population).
-
-How does gcc-config work?
--------------------------
-
-/usr/bin/gcc (or /usr/bin/<tool>) is a wrapper (wrapper.c).
-gcc-config allows runtime gcc switch via level of indirection.
-
-Tool name is ${CTARGET}-<tool> or <tool>. TODO: doesn't it break
-on ${CTARGET}-<tool>-<version>? Doesn't ${CTARGET} get misdetected?
-
-Today's resolution order is the following:
+      Empty.
 
-1. Searches PATH for <tool> and reexecute if found. Some
-   target paths are ignored:
-   - itself (/usr/bin/<tool>) is ignored to avoid recursion
-   - */gcc-bin/* (/usr/${CHOST}/${CTARGET}/gcc-bin/7.3.0) is ignored
-     as those should precede in PATH to avoid wrapping entirely or be
-     selected via gcc-config.
-2. If [1.] failed search for /etc/env.d/: /etc/env.d/gcc/.NATIVE (native compiler),
-   /etc/env.d/05gcc-${CTARGET} (cross-compiler).
-
-   There GCC_PATH= (native) or PATH= (cross) directory entry is searched.
-
-   Usually it's GCC_PATH="${EPREFIX}/usr/${CHOST}/gcc-bin/<gcc-version>" (native)
-   or GCC_PATH="${EPREFIX}/usr/${CHOST}/${CTARGET}/gcc-bin/<gcc-version>" (cross)
-
-3. If [2.] failed run 'ROOT= gcc-config --get-bin-path' and use it's output.
-
-4. Prepend path fetched from above to PATH environment variable and re-exec().
-
-5. Done
-
-`gcc-config` script maintains binaries in `/usr/bin/` to make the above model work.
-
-To make compiler switchable in active shell `/usr/bin/` path must precede
-'/usr/${CHOST}/gcc-bin/<gcc-version>'. Otherwise wrapper is skipped.
+      Until Aug 2018 used to contain paths for cross-compilers.
+      To be removed eventually.
 
 TODOs
 -----
 
 - Write proper `gcc-config` manpage off this readme to be more discoverable.
 
-- Make /usr/bin/<tool> a symlink of /usr/$(libexec)/gcc-config/wrapper,
-  not a file copy. This will make the fact that Gentoo uses wrappers more obvious.
-  It's essential to know for people using ccache cache or similar.
-
-- Move /etc/env.d/05gcc-${CTARGET} and /etc/env.d/04gcc-${CTARGET} after
-  /usr/bin PATH injection to restore gcc-config wrapping.
+- Figure out symlink ownership story. Today symlinks don't belong to any package.
 
-  See https://bugs.gentoo.org/255695 for some details.
+  See https://bugs.gentoo.org/626606

diff --git a/gcc-config b/gcc-config
index 521e3ba..e7f3fb9 100755
--- a/gcc-config
+++ b/gcc-config
@@ -167,16 +167,14 @@ convert_profile_paths() {
 	return 0
 }
 
-# Usage: atomic_cp <source file> <destination dir> <destination file name> <reference file (mtimes)>
-atomic_cp() {
-	local src=$1 dst=$2 dstfile=$3 ref=$4 tmp
+# Usage: atomic_ln <source file> <destination dir> <destination file name>
+atomic_ln() {
+	local src=$1 dst=$2 dstfile=$3 tmp
 	tmp="${dst}/.gcc.config.${dstfile}"
-	# We need to do this mv to make the update atomic in case
-	# someone is compiling at the same time they're running
-	# gcc-config (which is OK if you're just updating gcc-config
-	# itself and picking the same profile).
-	cp -f "${src}" "${tmp}"
-	touch -r "${ref}" "${tmp}"
+	# `ln` will expand into unlink();symlink(); which
+	# is not atomic for a small amount of time, but
+	# `mv` is a single rename() call
+	ln -sf "${src}" "${tmp}"
 	mv "${tmp}" "${dst}/${dstfile}"
 }
 
@@ -197,13 +195,6 @@ update_wrappers() {
 	# for new functionality (like a version bump).
 	local x CTARGET=$1
 
-	# Find the bin wrapper
-	local libdir wrapper
-	for libdir in ${GENTOO_LIBDIR} lib lib64 lib32 lib ; do
-		wrapper="${EROOT}usr/${libdir}/gcc-config/wrapper"
-		[[ -e ${wrapper} ]] && break
-	done
-
 	# Use the old dir to see what we wrapped up previously.
 	local old_wrappers=( $(
 		[[ -n ${OLD_GCC_PATH} ]] || exit 1
@@ -261,9 +252,9 @@ update_wrappers() {
 			fi
 		fi
 
-		# Now do the actual wrapper copy with paths to the reference binary
+		# Now do the actual linking to the target binary
 		if [[ -x ${ref} ]] ; then
-			atomic_cp "${wrapper}" "${EROOT}usr/bin" "${x}" "${ref}"
+			atomic_ln "${ref#${ROOT}}" "${EROOT}usr/bin" "${x}"
 		else
 			ewarn "double insanity with ${x} and ${ref}"
 			# Make sure we have no stale wrappers
@@ -275,7 +266,7 @@ update_wrappers() {
 
 	# install the canonical cpp wrapper
 	if ! is_cross_compiler ; then
-		atomic_cp "${wrapper}" "${EROOT}lib" "cpp" "${EROOT}usr/bin/cpp"
+		atomic_ln "${EPREFIX%/}/usr/bin/cpp" "${EROOT}lib" "cpp"
 	fi
 }
 
@@ -619,8 +610,7 @@ switch_profile() {
 	is_cross_compiler && envd_num="05" || envd_num="04"
 	envd="${ENV_D}/${envd_num}gcc-${CTARGET}"
 	cat <<-EOF > "${envd}.tmp"
-		PATH="${GCC_PATH}"
-		ROOTPATH="${GCC_PATH}"
+		# Autogenerated by 'gcc-config'.
 	EOF
 	if ! is_cross_compiler ; then
 		# Only write GCC_SPECS for the native compiler. #420097
@@ -724,6 +714,7 @@ switch_profile() {
 
 	eend 0
 
+	# Not needed since Aug 2018. Can be removed later (say, in a year).
 	if [[ ${envd_changed} -ne 0 ]] ; then
 		echo
 		ewarn "If you intend to use the gcc from the new profile in an already"

diff --git a/tests/rw-multi-native-configs/test.select b/tests/rw-multi-native-configs/test.select
index c6d9daf..a9cc1d1 100644
--- a/tests/rw-multi-native-configs/test.select
+++ b/tests/rw-multi-native-configs/test.select
@@ -18,10 +18,10 @@ for (( i = 1; i < 4; ++i )) ; do
 	esac
 
 	for b in "${do_want[@]}" ; do
-		[[ -e usr/bin/${b} ]] || exit 1
+		[[ -L usr/bin/${b} ]] || exit 1
 	done
 	for b in "${dont_want[@]}" ; do
-		[[ -e usr/bin/${b} ]] && exit 1
+		[[ -L usr/bin/${b} ]] && exit 1
 	done
 	[[ -e etc/env.d/04gcc-${CHOST} ]] || exit 1
 done

diff --git a/tests/rw-multi-native-configs/usr/lib/gcc-config/wrapper b/tests/rw-multi-native-configs/usr/lib/gcc-config/wrapper
deleted file mode 100755
index e69de29..0000000

diff --git a/tests/source/test.whitespace b/tests/source/test.whitespace
index 28108ae..26d1bdb 100644
--- a/tests/source/test.whitespace
+++ b/tests/source/test.whitespace
@@ -1,2 +1,2 @@
 #!/bin/bash
-! egrep -nH '[[:space:]]+$' "${TROOT}"/../{gcc-config,wrapper.c}
+! egrep -nH '[[:space:]]+$' "${TROOT}"/../gcc-config

diff --git a/wrapper.c b/wrapper.c
deleted file mode 100644
index c245dbb..0000000
--- a/wrapper.c
+++ /dev/null
@@ -1,323 +0,0 @@
-/*
- * Copyright 1999-2012 Gentoo Foundation
- * Distributed under the terms of the GNU General Public License v2
- * 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
-
-#ifndef _FILE_OFFSET_BITS
-# define _FILE_OFFSET_BITS 64	/* #471024 */
-#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>
-
-#ifndef EPREFIX
-# define EPREFIX ""
-#endif
-
-#define GCC_CONFIG EPREFIX "/usr/bin/gcc-config"
-#define ENVD_BASE  EPREFIX "/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, EPREFIX "/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("ROOT= " 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;
-	(void)argc; /* unused variable */
-
-	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(EPREFIX "/usr/bin/") + 1);
-	sprintf(data.fullname, EPREFIX "/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;
-}