uclibc-ng/extra/gcc-uClibc/gcc-uClibc.c

/*
 * 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.
 *
 * TODO:
 * Check/modify gcc-specific environment variables?
 */

#ifdef DEBUG
#include <stdio.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "gcc-uClibc.h"

#define UCLIBC_CRT0 UCLIBC_DIR"crt0.o"
#define UCLIBC_CRT0_G UCLIBC_CRT0
#define UCLIBC_LIB UCLIBC_DIR"libc.a"
#define UCLIBC_SHAREDLIB "-luClibc"
#if 1
#define UCLIBC_LIB_G UCLIBC_LIB
#define UCLIBC_SHAREDLIB_G UCLIBC_SHAREDLIB
#else
#define UCLIBC_LIB_G UCLIBC_DIR"libc.a-debug"

#endif
#define UCLIBC_INC "-I"UCLIBC_DIR"include/"

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 debugging = 0, linking = 1, use_static_linking = 0;
	int use_stdinc = 1, use_start = 1, use_stdlib = 1;
	int i, j;
	int source_count;
	char ** gcc_argv;

	source_count = 0;
	/* 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); 


	for ( i = 1 ; i < argc ; i++ ) {
		if (argv[i][0] == '-') { /* option */
			switch (argv[i][1]) {
				case 'c':
				case 'S':
				case 'E':
				case 'r':
					if (argv[i][2] == 0) linking = 0;
					break;
				case 'g':
					if (argv[i][2] == 0) debugging = 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':
					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;
		gcc_argv[i++] = GCC_INCDIR;
	}
	if (linking && source_count) {
		if (use_start) {
			if (debugging) {
				gcc_argv[i++] = UCLIBC_CRT0_G;
			} else {
				gcc_argv[i++] = UCLIBC_CRT0;
			}
		}
		if (use_stdlib) {
			gcc_argv[i++] = nostdlib;
			if (use_static_linking) {
				if (debugging) {
					gcc_argv[i++] = UCLIBC_LIB_G;
				} else {
					gcc_argv[i++] = UCLIBC_LIB;
				}
			} else {
				if (DYNAMIC_LINKER[0]) { /* not empty string */
					gcc_argv[i++] = "-Wl,--dynamic-linker";
					gcc_argv[i++] = DYNAMIC_LINKER;
				}
				if (debugging) {
					gcc_argv[i++] = UCLIBC_SHAREDLIB_G;
				} else {
					gcc_argv[i++] = UCLIBC_SHAREDLIB;
				}
			}
			gcc_argv[i++] = GCC_LIB;
			if (!use_static_linking && DYNAMIC_LINKER[0]) {
			    gcc_argv[i++] = DYNAMIC_LINKER;
			}
		}
	}
	gcc_argv[i++] = NULL;

#ifdef DEBUG
	for ( j = 0 ; gcc_argv[j] ; j++ ) {
		printf("arg[%2i] = %s\n", j, gcc_argv[j]);
	}
	return EXIT_SUCCESS;
#else
	return execvp(GCC_BIN, gcc_argv);
#endif
}