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/*
* Copyright (C) 2000 Manuel Novoa III
*
* 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.
*
*/
/*
*
* TODO:
* Check/modify gcc-specific environment variables?
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "gcc-uClibc.h"
static char *rpath_link[] = {
"-Wl,-rpath-link,"UCLIBC_INSTALL_DIR"lib",
"-Wl,-rpath-link,"UCLIBC_BUILD_DIR
};
static char *rpath[] = {
"-Wl,-rpath,"UCLIBC_INSTALL_DIR"lib",
"-Wl,-rpath,"UCLIBC_BUILD_DIR
};
static char *uClibc_inc[] = {
"-I"UCLIBC_INSTALL_DIR"include/",
"-I"UCLIBC_BUILD_DIR"include/"
};
static char *crt0_path[] = {
UCLIBC_INSTALL_DIR"lib/crt0.o",
UCLIBC_BUILD_DIR"crt0.o"
};
static char *lib_path[] = {
"-L"UCLIBC_INSTALL_DIR"lib",
"-L"UCLIBC_BUILD_DIR
};
static char static_linking[] = "-static";
static char nostdinc[] = "-nostdinc";
static char nostartfiles[] = "-nostartfiles";
static char nodefaultlibs[] = "-nodefaultlibs";
static char nostdlib[] = "-nostdlib";
int main(int argc, char **argv)
{
int use_build_dir = 0, linking = 1, use_static_linking = 0;
int use_stdinc = 1, use_start = 1, use_stdlib = 1;
int source_count = 0, use_rpath = 0, verbose = 0;
int i, j;
char ** gcc_argv;
char *ep;
ep = getenv("UCLIBC_GCC");
if (!ep) {
ep = "";
}
if ((strstr(argv[0],"build") != 0) || (strstr(ep,"build") != 0)) {
use_build_dir = 1;
}
if ((strstr(argv[0],"rpath") != 0) || (strstr(ep,"rpath") != 0)) {
use_rpath = 1;
}
#if 0
/* Erik added this stuff in. Disabled but kept in case the new changes */
/* don't do what he needed. */
/* FIXME: We need to work out the install vs use-in-built-dir
* issue..*/
/* Apparently gcc doesn't accept this stuff via the command line */
setenv("COMPILER_PATH", UCLIBC_DIR"extra/gcc-uClibc/", 1);
setenv("LIBRARY_PATH", UCLIBC_DIR"lib/", 1);
/* The double '/' works around a gcc bug */
setenv("GCC_EXEC_PREFIX", UCLIBC_DIR"extra/gcc-uClibc//", 1);
#endif
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 'r': /* partial-link */
case 'i': /* partial-link */
case 'M': /* map file generation */
if (argv[i][2] == 0) linking = 0;
break;
case 'v': /* verbose */
if (argv[i][2] == 0) verbose = 1;
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;
} else if (strcmp(nostdlib,argv[i]) == 0) {
use_start = 0;
use_stdlib = 0;
}
break;
case 's':
if (strcmp(static_linking,argv[i]) == 0) {
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;
}
}
break;
case '-':
if (strcmp(static_linking,argv[i]+1) == 0) {
use_static_linking = 1;
}
break;
}
} else { /* assume it is an existing source file */
++source_count;
}
}
#if 1
gcc_argv = __builtin_alloca(sizeof(char*) * (argc + 20));
#else
if (!(gcc_argv = malloc(sizeof(char) * (argc + 20)))) {
return EXIT_FAILURE;
}
#endif
i = 0;
gcc_argv[i++] = GCC_BIN;
for ( j = 1 ; j < argc ; j++ ) {
gcc_argv[i++] = argv[j];
}
if (use_stdinc) {
gcc_argv[i++] = nostdinc;
gcc_argv[i++] = uClibc_inc[use_build_dir];
gcc_argv[i++] = GCC_INCDIR;
}
if (linking && source_count) {
if (!use_static_linking) {
if (DYNAMIC_LINKER[0]) { /* not empty string */
gcc_argv[i++] = "-Wl,--dynamic-linker,"DYNAMIC_LINKER;
if (strstr(DYNAMIC_LINKER,"uclibc") != 0) { /* custom linker */
use_rpath = 0; /* so -rpath not needed for normal case */
}
}
if (use_build_dir || use_rpath) {
gcc_argv[i++] = rpath[use_build_dir];
}
}
gcc_argv[i++] = rpath_link[use_build_dir]; /* just to be safe */
gcc_argv[i++] = lib_path[use_build_dir];
if (use_start) {
gcc_argv[i++] = crt0_path[use_build_dir];
}
if (use_stdlib) {
gcc_argv[i++] = nostdlib;
gcc_argv[i++] = "-lc";
gcc_argv[i++] = GCC_LIB;
}
if (!use_static_linking) {
gcc_argv[i++] = DYNAMIC_LINKER;
}
}
gcc_argv[i++] = NULL;
if (verbose) {
printf("Invoked as %s\n", argv[0]);
for ( j = 0 ; gcc_argv[j] ; j++ ) {
printf("arg[%2i] = %s\n", j, gcc_argv[j]);
}
}
return execvp(GCC_BIN, gcc_argv);
}
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