--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dmd2/link.c.nolink	Tue Nov 11 01:38:48 2008 +0100
@@ -0,0 +1,505 @@
+
+// Copyright (c) 1999-2008 by Digital Mars
+// All Rights Reserved
+// written by Walter Bright
+// http://www.digitalmars.com
+// License for redistribution is by either the Artistic License
+// in artistic.txt, or the GNU General Public License in gnu.txt.
+// See the included readme.txt for details.
+
+
+#include	<stdio.h>
+#include	<ctype.h>
+#include	<assert.h>
+#include	<stdarg.h>
+#include	<string.h>
+#include	<stdlib.h>
+
+#if _WIN32
+#include	<process.h>
+#endif
+
+#if linux
+#include	<sys/types.h>
+#include	<sys/wait.h>
+#include	<unistd.h>
+#endif
+
+#include	"root.h"
+
+#include	"mars.h"
+
+#include	"mem.h"
+
+int executecmd(char *cmd, char *args, int useenv);
+int executearg0(char *cmd, char *args);
+
+/****************************************
+ * Write filename to cmdbuf, quoting if necessary.
+ */
+
+void writeFilename(OutBuffer *buf, char *filename, size_t len)
+{
+    /* Loop and see if we need to quote
+     */
+    for (size_t i = 0; i < len; i++)
+    {	char c = filename[i];
+
+	if (isalnum(c) || c == '_')
+	    continue;
+
+	/* Need to quote
+	 */
+	buf->writeByte('"');
+	buf->write(filename, len);
+	buf->writeByte('"');
+	return;
+    }
+
+    /* No quoting necessary
+     */
+    buf->write(filename, len);
+}
+
+void writeFilename(OutBuffer *buf, char *filename)
+{
+    writeFilename(buf, filename, strlen(filename));
+}
+
+/*****************************
+ * Run the linker.  Return status of execution.
+ */
+
+int runLINK()
+{
+#if _WIN32
+    char *p;
+    int i;
+    int status;
+    OutBuffer cmdbuf;
+
+    global.params.libfiles->push((void *) "user32");
+    global.params.libfiles->push((void *) "kernel32");
+
+    for (i = 0; i < global.params.objfiles->dim; i++)
+    {
+	if (i)
+	    cmdbuf.writeByte('+');
+	p = (char *)global.params.objfiles->data[i];
+	char *ext = FileName::ext(p);
+	if (ext)
+	    // Write name sans extension
+	    writeFilename(&cmdbuf, p, ext - p - 1);
+	else
+	    writeFilename(&cmdbuf, p);
+    }
+    cmdbuf.writeByte(',');
+    if (global.params.exefile)
+	writeFilename(&cmdbuf, global.params.exefile);
+    else
+    {	/* Generate exe file name from first obj name.
+	 * No need to add it to cmdbuf because the linker will default to it.
+	 */
+	char *n = (char *)global.params.objfiles->data[0];
+	n = FileName::name(n);
+	FileName *fn = FileName::forceExt(n, "exe");
+	global.params.exefile = fn->toChars();
+    }
+
+    // Make sure path to exe file exists
+    {	char *p = FileName::path(global.params.exefile);
+	FileName::ensurePathExists(p);
+	mem.free(p);
+    }
+
+    cmdbuf.writeByte(',');
+    if (global.params.run)
+	cmdbuf.writestring("nul");
+//    if (mapfile)
+//	cmdbuf.writestring(output);
+    cmdbuf.writeByte(',');
+
+    for (i = 0; i < global.params.libfiles->dim; i++)
+    {
+	if (i)
+	    cmdbuf.writeByte('+');
+	writeFilename(&cmdbuf, (char *) global.params.libfiles->data[i]);
+    }
+
+    if (global.params.deffile)
+    {
+	cmdbuf.writeByte(',');
+	writeFilename(&cmdbuf, global.params.deffile);
+    }
+
+    /* Eliminate unnecessary trailing commas	*/
+    while (1)
+    {   i = cmdbuf.offset;
+	if (!i || cmdbuf.data[i - 1] != ',')
+	    break;
+	cmdbuf.offset--;
+    }
+
+    if (global.params.resfile)
+    {
+	cmdbuf.writestring("/RC:");
+	writeFilename(&cmdbuf, global.params.resfile);
+    }
+
+#if 0
+    if (mapfile)
+	cmdbuf.writestring("/m");
+    if (debuginfo)
+	cmdbuf.writestring("/li");
+    if (codeview)
+    {
+	cmdbuf.writestring("/co");
+	if (codeview3)
+	    cmdbuf.writestring(":3");
+    }
+#else
+    if (global.params.symdebug)
+	cmdbuf.writestring("/co");
+#endif
+
+    cmdbuf.writestring("/noi");
+    for (i = 0; i < global.params.linkswitches->dim; i++)
+    {
+	cmdbuf.writestring((char *) global.params.linkswitches->data[i]);
+    }
+    cmdbuf.writeByte(';');
+
+    p = cmdbuf.toChars();
+
+    FileName *lnkfilename = NULL;
+    size_t plen = strlen(p);
+    if (plen > 7000)
+    {
+	lnkfilename = FileName::forceExt(global.params.exefile, "lnk");
+	File flnk(lnkfilename);
+	flnk.setbuffer(p, plen);
+	flnk.ref = 1;
+	if (flnk.write())
+	    error("error writing file %s", lnkfilename);
+	if (lnkfilename->len() < plen)
+	    sprintf(p, "@%s", lnkfilename->toChars());
+    }
+
+    char *linkcmd = getenv("LINKCMD");
+    if (!linkcmd)
+	linkcmd = "link";
+    status = executecmd(linkcmd, p, 1);
+    if (lnkfilename)
+    {
+	remove(lnkfilename->toChars());
+	delete lnkfilename;
+    }
+    return status;
+#elif linux
+    pid_t childpid;
+    int i;
+    int status;
+
+    // Build argv[]
+    Array argv;
+
+    const char *cc = getenv("CC");
+    if (!cc)
+	cc = "gcc";
+    argv.push((void *)cc);
+    argv.insert(1, global.params.objfiles);
+
+    // None of that a.out stuff. Use explicit exe file name, or
+    // generate one from name of first source file.
+    argv.push((void *)"-o");
+    if (global.params.exefile)
+    {
+	argv.push(global.params.exefile);
+    }
+    else
+    {	// Generate exe file name from first obj name
+	char *n = (char *)global.params.objfiles->data[0];
+	char *e;
+	char *ex;
+
+	n = FileName::name(n);
+	e = FileName::ext(n);
+	if (e)
+	{
+	    e--;			// back up over '.'
+	    ex = (char *)mem.malloc(e - n + 1);
+	    memcpy(ex, n, e - n);
+	    ex[e - n] = 0;
+	}
+	else
+	    ex = (char *)"a.out";	// no extension, so give up
+	argv.push(ex);
+	global.params.exefile = ex;
+    }
+
+    // Make sure path to exe file exists
+    {	char *p = FileName::path(global.params.exefile);
+	FileName::ensurePathExists(p);
+	mem.free(p);
+    }
+
+    argv.insert(argv.dim, global.params.libfiles);
+
+    if (global.params.symdebug)
+	argv.push((void *)"-g");
+
+    argv.push((void *)"-m32");
+
+    if (0 && global.params.exefile)
+    {
+	/* This switch enables what is known as 'smart linking'
+	 * in the Windows world, where unreferenced sections
+	 * are removed from the executable. It eliminates unreferenced
+	 * functions, essentially making a 'library' out of a module.
+	 * Although it is documented to work with ld version 2.13,
+	 * in practice it does not, but just seems to be ignored.
+	 * Thomas Kuehne has verified that it works with ld 2.16.1.
+	 * BUG: disabled because it causes exception handling to fail
+	 */
+	argv.push((void *)"-Xlinker");
+	argv.push((void *)"--gc-sections");
+    }
+
+    for (i = 0; i < global.params.linkswitches->dim; i++)
+    {	char *p = (char *)global.params.linkswitches->data[i];
+	if (!p || !p[0] || !(p[0] == '-' && p[1] == 'l'))
+	    // Don't need -Xlinker if switch starts with -l
+	    argv.push((void *)"-Xlinker");
+	argv.push((void *) p);
+    }
+
+    /* Standard libraries must go after user specified libraries
+     * passed with -l.
+     */
+    const char *libname = (global.params.symdebug)
+				? global.params.debuglibname
+				: global.params.defaultlibname;
+    char *buf = (char *)malloc(2 + strlen(libname) + 1);
+    strcpy(buf, "-l");
+    strcpy(buf + 2, libname);
+    argv.push((void *)buf);		// turns into /usr/lib/libphobos2.a
+
+    argv.push((void *)"-ldruntime");
+    argv.push((void *)"-lpthread");
+    argv.push((void *)"-lm");
+
+    if (!global.params.quiet || global.params.verbose)
+    {
+	// Print it
+	for (i = 0; i < argv.dim; i++)
+	    printf("%s ", (char *)argv.data[i]);
+	printf("\n");
+	fflush(stdout);
+    }
+
+    argv.push(NULL);
+    childpid = fork();
+    if (childpid == 0)
+    {
+	execvp((char *)argv.data[0], (char **)argv.data);
+	perror((char *)argv.data[0]);		// failed to execute
+	return -1;
+    }
+
+    waitpid(childpid, &status, 0);
+
+    status=WEXITSTATUS(status);
+    if (status)
+	printf("--- errorlevel %d\n", status);
+    return status;
+#else
+    printf ("Linking is not yet supported for this version of DMD.\n");
+    return -1;
+#endif
+}
+
+/**********************************
+ * Delete generated EXE file.
+ */
+
+void deleteExeFile()
+{
+    if (global.params.exefile)
+    {
+	//printf("deleteExeFile() %s\n", global.params.exefile);
+	remove(global.params.exefile);
+    }
+}
+
+/******************************
+ * Execute a rule.  Return the status.
+ *	cmd	program to run
+ *	args	arguments to cmd, as a string
+ *	useenv	if cmd knows about _CMDLINE environment variable
+ */
+
+#if _WIN32
+int executecmd(char *cmd, char *args, int useenv)
+{
+    int status;
+    char *buff;
+    size_t len;
+
+    if (!global.params.quiet || global.params.verbose)
+    {
+	printf("%s %s\n", cmd, args);
+	fflush(stdout);
+    }
+
+    if ((len = strlen(args)) > 255)
+    {   char *q;
+	static char envname[] = "@_CMDLINE";
+
+	envname[0] = '@';
+	switch (useenv)
+	{   case 0:	goto L1;
+	    case 2: envname[0] = '%';	break;
+	}
+	q = (char *) alloca(sizeof(envname) + len + 1);
+	sprintf(q,"%s=%s", envname + 1, args);
+	status = putenv(q);
+	if (status == 0)
+	    args = envname;
+	else
+	{
+	L1:
+	    error("command line length of %d is too long",len);
+	}
+    }
+
+    status = executearg0(cmd,args);
+#if _WIN32
+    if (status == -1)
+	status = spawnlp(0,cmd,cmd,args,NULL);
+#endif
+//    if (global.params.verbose)
+//	printf("\n");
+    if (status)
+    {
+	if (status == -1)
+	    printf("Can't run '%s', check PATH\n", cmd);
+	else
+	    printf("--- errorlevel %d\n", status);
+    }
+    return status;
+}
+#endif
+
+/**************************************
+ * Attempt to find command to execute by first looking in the directory
+ * where DMD was run from.
+ * Returns:
+ *	-1	did not find command there
+ *	!=-1	exit status from command
+ */
+
+#if _WIN32
+int executearg0(char *cmd, char *args)
+{
+    char *file;
+    char *argv0 = global.params.argv0;
+
+    //printf("argv0='%s', cmd='%s', args='%s'\n",argv0,cmd,args);
+
+    // If cmd is fully qualified, we don't do this
+    if (FileName::absolute(cmd))
+	return -1;
+
+    file = FileName::replaceName(argv0, cmd);
+
+    //printf("spawning '%s'\n",file);
+#if _WIN32
+    return spawnl(0,file,file,args,NULL);
+#elif linux
+    char *full;
+    int cmdl = strlen(cmd);
+
+    full = (char*) mem.malloc(cmdl + strlen(args) + 2);
+    if (full == NULL)
+	return 1;
+    strcpy(full, cmd);
+    full [cmdl] = ' ';
+    strcpy(full + cmdl + 1, args);
+
+    int result = system(full);
+
+    mem.free(full);
+    return result;
+#else
+    assert(0);
+#endif
+}
+#endif
+
+/***************************************
+ * Run the compiled program.
+ * Return exit status.
+ */
+
+int runProgram()
+{
+    //printf("runProgram()\n");
+    if (global.params.verbose)
+    {
+	printf("%s", global.params.exefile);
+	for (size_t i = 0; i < global.params.runargs_length; i++)
+	    printf(" %s", (char *)global.params.runargs[i]);
+	printf("\n");
+    }
+
+    // Build argv[]
+    Array argv;
+
+    argv.push((void *)global.params.exefile);
+    for (size_t i = 0; i < global.params.runargs_length; i++)
+    {	char *a = global.params.runargs[i];
+
+#if _WIN32
+	// BUG: what about " appearing in the string?
+	if (strchr(a, ' '))
+	{   char *b = (char *)mem.malloc(3 + strlen(a));
+	    sprintf(b, "\"%s\"", a);
+	    a = b;
+	}
+#endif
+	argv.push((void *)a);
+    }
+    argv.push(NULL);
+
+#if _WIN32
+    char *ex = FileName::name(global.params.exefile);
+    if (ex == global.params.exefile)
+	ex = FileName::combine(".", ex);
+    else
+	ex = global.params.exefile;
+    return spawnv(0,ex,(char **)argv.data);
+#elif linux
+    pid_t childpid;
+    int status;
+
+    childpid = fork();
+    if (childpid == 0)
+    {
+	const char *fn = (const char *)argv.data[0];
+	if (!FileName::absolute(fn))
+	{   // Make it "./fn"
+	    fn = FileName::combine(".", fn);
+	}
+	execv(fn, (char **)argv.data);
+	perror(fn);		// failed to execute
+	return -1;
+    }
+
+    waitpid(childpid, &status, 0);
+
+    status = WEXITSTATUS(status);
+    return status;
+#else
+    assert(0);
+#endif
+}