build system overhaul

4 files changed, 1035 insertions, 0 deletions

diff --git a/scripts/basic/Makefile b/scripts/basic/Makefile
new file mode 100644
index 000000000..f22e94c3a
--- /dev/null
+++ b/scripts/basic/Makefile
@@ -0,0 +1,18 @@
+###
+# Makefile.basic list the most basic programs used during the build process.
+# The programs listed herein is what is needed to do the basic stuff,
+# such as splitting .config and fix dependency file.
+# This initial step is needed to avoid files to be recompiled
+# when kernel configuration changes (which is what happens when
+# .config is included by main Makefile.
+# ---------------------------------------------------------------------------
+# fixdep:        Used to generate dependency information during build process
+# split-include: Divide all config symbols up in a number of files in
+#                include/config/...
+# docproc:       Used in Documentation/docbook
+
+hostprogs-y     := fixdep split-include docproc
+always          := $(hostprogs-y)
+
+# fixdep is needed to compile other host programs
+$(addprefix $(obj)/,$(filter-out fixdep,$(always))): $(obj)/fixdep
diff --git a/scripts/basic/docproc.c b/scripts/basic/docproc.c
new file mode 100644
index 000000000..cb02baa63
--- /dev/null
+++ b/scripts/basic/docproc.c
@@ -0,0 +1,398 @@
+/*
+ *      docproc is a simple preprocessor for the template files
+ *      used as placeholders for the kernel internal documentation.
+ *      docproc is used for documentation-frontend and
+ *      dependency-generator.
+ *      The two usages have in common that they require
+ *      some knowledge of the .tmpl syntax, therefore they
+ *      are kept together.
+ *
+ *      documentation-frontend
+ *              Scans the template file and call kernel-doc for
+ *              all occurrences of ![EIF]file
+ *              Beforehand each referenced file are scanned for
+ *              any exported sympols "EXPORT_SYMBOL()" statements.
+ *              This is used to create proper -function and
+ *              -nofunction arguments in calls to kernel-doc.
+ *              Usage: docproc doc file.tmpl
+ *
+ *      dependency-generator:
+ *              Scans the template file and list all files
+ *              referenced in a format recognized by make.
+ *              Usage:  docproc depend file.tmpl
+ *              Writes dependency information to stdout
+ *              in the following format:
+ *              file.tmpl src.c src2.c
+ *              The filenames are obtained from the following constructs:
+ *              !Efilename
+ *              !Ifilename
+ *              !Dfilename
+ *              !Ffilename
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+/* exitstatus is used to keep track of any failing calls to kernel-doc,
+ * but execution continues. */
+int exitstatus = 0;
+
+typedef void DFL(char *);
+DFL *defaultline;
+
+typedef void FILEONLY(char * file);
+FILEONLY *internalfunctions;
+FILEONLY *externalfunctions;
+FILEONLY *symbolsonly;
+
+typedef void FILELINE(char * file, char * line);
+FILELINE * singlefunctions;
+FILELINE * entity_system;
+
+#define MAXLINESZ     2048
+#define MAXFILES      250
+#define KERNELDOCPATH "scripts/"
+#define KERNELDOC     "kernel-doc"
+#define DOCBOOK       "-docbook"
+#define FUNCTION      "-function"
+#define NOFUNCTION    "-nofunction"
+
+void usage (void)
+{
+        fprintf(stderr, "Usage: docproc {doc|depend} file\n");
+        fprintf(stderr, "Input is read from file.tmpl. Output is sent to stdout\n");
+        fprintf(stderr, "doc: frontend when generating kernel documentation\n");
+        fprintf(stderr, "depend: generate list of files referenced within file\n");
+}
+
+/*
+ * Execute kernel-doc with parameters givin in svec
+ */
+void exec_kernel_doc(char **svec)
+{
+        pid_t pid;
+        int ret;
+        char real_filename[PATH_MAX + 1];
+        /* Make sure output generated so far are flushed */
+        fflush(stdout);
+        switch(pid=fork()) {
+                case -1:
+                        perror("fork");
+                        exit(1);
+                case  0:
+                        memset(real_filename, 0, sizeof(real_filename));
+                        strncat(real_filename, getenv("SRCTREE"), PATH_MAX);
+                        strncat(real_filename, KERNELDOCPATH KERNELDOC,
+                                        PATH_MAX - strlen(real_filename));
+                        execvp(real_filename, svec);
+                        fprintf(stderr, "exec ");
+                        perror(real_filename);
+                        exit(1);
+                default:
+                        waitpid(pid, &ret ,0);
+        }
+        if (WIFEXITED(ret))
+                exitstatus |= WEXITSTATUS(ret);
+        else
+                exitstatus = 0xff;
+}
+
+/* Types used to create list of all exported symbols in a number of files */
+struct symbols
+{
+        char *name;
+};
+
+struct symfile
+{
+        char *filename;
+        struct symbols *symbollist;
+        int symbolcnt;
+};
+
+struct symfile symfilelist[MAXFILES];
+int symfilecnt = 0;
+
+void add_new_symbol(struct symfile *sym, char * symname)
+{
+        sym->symbollist =
+          realloc(sym->symbollist, (sym->symbolcnt + 1) * sizeof(char *));
+        sym->symbollist[sym->symbolcnt++].name = strdup(symname);
+}
+
+/* Add a filename to the list */
+struct symfile * add_new_file(char * filename)
+{
+        symfilelist[symfilecnt++].filename = strdup(filename);
+        return &symfilelist[symfilecnt - 1];
+}
+/* Check if file already are present in the list */
+struct symfile * filename_exist(char * filename)
+{
+        int i;
+        for (i=0; i < symfilecnt; i++)
+                if (strcmp(symfilelist[i].filename, filename) == 0)
+                        return &symfilelist[i];
+        return NULL;
+}
+
+/*
+ * List all files referenced within the template file.
+ * Files are separated by tabs.
+ */
+void adddep(char * file)                   { printf("\t%s", file); }
+void adddep2(char * file, char * line)     { line = line; adddep(file); }
+void noaction(char * line)                 { line = line; }
+void noaction2(char * file, char * line)   { file = file; line = line; }
+
+/* Echo the line without further action */
+void printline(char * line)               { printf("%s", line); }
+
+/*
+ * Find all symbols exported with EXPORT_SYMBOL and EXPORT_SYMBOL_GPL
+ * in filename.
+ * All symbols located are stored in symfilelist.
+ */
+void find_export_symbols(char * filename)
+{
+        FILE * fp;
+        struct symfile *sym;
+        char line[MAXLINESZ];
+        if (filename_exist(filename) == NULL) {
+                char real_filename[PATH_MAX + 1];
+                memset(real_filename, 0, sizeof(real_filename));
+                strncat(real_filename, getenv("SRCTREE"), PATH_MAX);
+                strncat(real_filename, filename,
+                                PATH_MAX - strlen(real_filename));
+                sym = add_new_file(filename);
+                fp = fopen(real_filename, "r");
+                if (fp == NULL)
+                {
+                        fprintf(stderr, "docproc: ");
+                        perror(real_filename);
+                }
+                while(fgets(line, MAXLINESZ, fp)) {
+                        char *p;
+                        char *e;
+                        if (((p = strstr(line, "EXPORT_SYMBOL_GPL")) != 0) ||
+                            ((p = strstr(line, "EXPORT_SYMBOL")) != 0)) {
+                                /* Skip EXPORT_SYMBOL{_GPL} */
+                                while (isalnum(*p) || *p == '_')
+                                        p++;
+                                /* Remove paranteses and additional ws */
+                                while (isspace(*p))
+                                        p++;
+                                if (*p != '(')
+                                        continue; /* Syntax error? */
+                                else
+                                        p++;
+                                while (isspace(*p))
+                                        p++;
+                                e = p;
+                                while (isalnum(*e) || *e == '_')
+                                        e++;
+                                *e = '\0';
+                                add_new_symbol(sym, p);
+                        }
+                }
+                fclose(fp);
+        }
+}
+
+/*
+ * Document all external or internal functions in a file.
+ * Call kernel-doc with following parameters:
+ * kernel-doc -docbook -nofunction function_name1 filename
+ * function names are obtained from all the the src files
+ * by find_export_symbols.
+ * intfunc uses -nofunction
+ * extfunc uses -function
+ */
+void docfunctions(char * filename, char * type)
+{
+        int i,j;
+        int symcnt = 0;
+        int idx = 0;
+        char **vec;
+
+        for (i=0; i <= symfilecnt; i++)
+                symcnt += symfilelist[i].symbolcnt;
+        vec = malloc((2 + 2 * symcnt + 2) * sizeof(char*));
+        if (vec == NULL) {
+                perror("docproc: ");
+                exit(1);
+        }
+        vec[idx++] = KERNELDOC;
+        vec[idx++] = DOCBOOK;
+        for (i=0; i < symfilecnt; i++) {
+                struct symfile * sym = &symfilelist[i];
+                for (j=0; j < sym->symbolcnt; j++) {
+                        vec[idx++]     = type;
+                        vec[idx++] = sym->symbollist[j].name;
+                }
+        }
+        vec[idx++]     = filename;
+        vec[idx] = NULL;
+        printf("<!-- %s -->\n", filename);
+        exec_kernel_doc(vec);
+        fflush(stdout);
+        free(vec);
+}
+void intfunc(char * filename) { docfunctions(filename, NOFUNCTION); }
+void extfunc(char * filename) { docfunctions(filename, FUNCTION);   }
+
+/*
+ * Document spåecific function(s) in a file.
+ * Call kernel-doc with the following parameters:
+ * kernel-doc -docbook -function function1 [-function function2]
+ */
+void singfunc(char * filename, char * line)
+{
+        char *vec[200]; /* Enough for specific functions */
+        int i, idx = 0;
+        int startofsym = 1;
+        vec[idx++] = KERNELDOC;
+        vec[idx++] = DOCBOOK;
+
+        /* Split line up in individual parameters preceeded by FUNCTION */
+        for (i=0; line[i]; i++) {
+                if (isspace(line[i])) {
+                        line[i] = '\0';
+                        startofsym = 1;
+                        continue;
+                }
+                if (startofsym) {
+                        startofsym = 0;
+                        vec[idx++] = FUNCTION;
+                        vec[idx++] = &line[i];
+                }
+        }
+        vec[idx++] = filename;
+        vec[idx] = NULL;
+        exec_kernel_doc(vec);
+}
+
+/*
+ * Parse file, calling action specific functions for:
+ * 1) Lines containing !E
+ * 2) Lines containing !I
+ * 3) Lines containing !D
+ * 4) Lines containing !F
+ * 5) Default lines - lines not matching the above
+ */
+void parse_file(FILE *infile)
+{
+        char line[MAXLINESZ];
+        char * s;
+        while(fgets(line, MAXLINESZ, infile)) {
+                if (line[0] == '!') {
+                        s = line + 2;
+                        switch (line[1]) {
+                                case 'E':
+                                        while (*s && !isspace(*s)) s++;
+                                        *s = '\0';
+                                        externalfunctions(line+2);
+                                        break;
+                                case 'I':
+                                        while (*s && !isspace(*s)) s++;
+                                        *s = '\0';
+                                        internalfunctions(line+2);
+                                        break;
+                                case 'D':
+                                        while (*s && !isspace(*s)) s++;
+                                        *s = '\0';
+                                        symbolsonly(line+2);
+                                        break;
+                                case 'F':
+                                        /* filename */
+                                        while (*s && !isspace(*s)) s++;
+                                        *s++ = '\0';
+                                        /* function names */
+                                        while (isspace(*s))
+                                                s++;
+                                        singlefunctions(line +2, s);
+                                        break;
+                                default:
+                                        defaultline(line);
+                        }
+                }
+                else {
+                        defaultline(line);
+                }
+        }
+        fflush(stdout);
+}
+
+
+int main(int argc, char *argv[])
+{
+        FILE * infile;
+        if (argc != 3) {
+                usage();
+                exit(1);
+        }
+        /* Open file, exit on error */
+        infile = fopen(argv[2], "r");
+        if (infile == NULL) {
+                fprintf(stderr, "docproc: ");
+                perror(argv[2]);
+                exit(2);
+        }
+
+        if (strcmp("doc", argv[1]) == 0)
+        {
+                /* Need to do this in two passes.
+                 * First pass is used to collect all symbols exported
+                 * in the various files.
+                 * Second pass generate the documentation.
+                 * This is required because function are declared
+                 * and exported in different files :-((
+                 */
+                /* Collect symbols */
+                defaultline       = noaction;
+                internalfunctions = find_export_symbols;
+                externalfunctions = find_export_symbols;
+                symbolsonly       = find_export_symbols;
+                singlefunctions   = noaction2;
+                parse_file(infile);
+
+                /* Rewind to start from beginning of file again */
+                fseek(infile, 0, SEEK_SET);
+                defaultline       = printline;
+                internalfunctions = intfunc;
+                externalfunctions = extfunc;
+                symbolsonly       = printline;
+                singlefunctions   = singfunc;
+
+                parse_file(infile);
+        }
+        else if (strcmp("depend", argv[1]) == 0)
+        {
+                /* Create first part of dependency chain
+                 * file.tmpl */
+                printf("%s\t", argv[2]);
+                defaultline       = noaction;
+                internalfunctions = adddep;
+                externalfunctions = adddep;
+                symbolsonly       = adddep;
+                singlefunctions   = adddep2;
+                parse_file(infile);
+                printf("\n");
+        }
+        else
+        {
+                fprintf(stderr, "Unknown option: %s\n", argv[1]);
+                exit(1);
+        }
+        fclose(infile);
+        fflush(stdout);
+        return exitstatus;
+}
+
diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
new file mode 100644
index 000000000..cc2c6541b
--- /dev/null
+++ b/scripts/basic/fixdep.c
@@ -0,0 +1,393 @@
+/*
+ * "Optimize" a list of dependencies as spit out by gcc -MD
+ * for the kernel build
+ * ===========================================================================
+ *
+ * Author       Kai Germaschewski
+ * Copyright    2002 by Kai Germaschewski  <kai.germaschewski@gmx.de>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ *
+ * Introduction:
+ *
+ * gcc produces a very nice and correct list of dependencies which
+ * tells make when to remake a file.
+ *
+ * To use this list as-is however has the drawback that virtually
+ * every file in the kernel includes <linux/config.h> which then again
+ * includes <linux/autoconf.h>
+ *
+ * If the user re-runs make *config, linux/autoconf.h will be
+ * regenerated.  make notices that and will rebuild every file which
+ * includes autoconf.h, i.e. basically all files. This is extremely
+ * annoying if the user just changed CONFIG_HIS_DRIVER from n to m.
+ *
+ * So we play the same trick that "mkdep" played before. We replace
+ * the dependency on linux/autoconf.h by a dependency on every config
+ * option which is mentioned in any of the listed prequisites.
+ *
+ * To be exact, split-include populates a tree in include/config/,
+ * e.g. include/config/his/driver.h, which contains the #define/#undef
+ * for the CONFIG_HIS_DRIVER option.
+ *
+ * So if the user changes his CONFIG_HIS_DRIVER option, only the objects
+ * which depend on "include/linux/config/his/driver.h" will be rebuilt,
+ * so most likely only his driver ;-)
+ *
+ * The idea above dates, by the way, back to Michael E Chastain, AFAIK.
+ *
+ * So to get dependencies right, there are two issues:
+ * o if any of the files the compiler read changed, we need to rebuild
+ * o if the command line given to the compile the file changed, we
+ *   better rebuild as well.
+ *
+ * The former is handled by using the -MD output, the later by saving
+ * the command line used to compile the old object and comparing it
+ * to the one we would now use.
+ *
+ * Again, also this idea is pretty old and has been discussed on
+ * kbuild-devel a long time ago. I don't have a sensibly working
+ * internet connection right now, so I rather don't mention names
+ * without double checking.
+ *
+ * This code here has been based partially based on mkdep.c, which
+ * says the following about its history:
+ *
+ *   Copyright abandoned, Michael Chastain, <mailto:mec@shout.net>.
+ *   This is a C version of syncdep.pl by Werner Almesberger.
+ *
+ *
+ * It is invoked as
+ *
+ *   fixdep <depfile> <target> <cmdline>
+ *
+ * and will read the dependency file <depfile>
+ *
+ * The transformed dependency snipped is written to stdout.
+ *
+ * It first generates a line
+ *
+ *   cmd_<target> = <cmdline>
+ *
+ * and then basically copies the .<target>.d file to stdout, in the
+ * process filtering out the dependency on linux/autoconf.h and adding
+ * dependencies on include/config/my/option.h for every
+ * CONFIG_MY_OPTION encountered in any of the prequisites.
+ *
+ * It will also filter out all the dependencies on *.ver. We need
+ * to make sure that the generated version checksum are globally up
+ * to date before even starting the recursive build, so it's too late
+ * at this point anyway.
+ *
+ * The algorithm to grep for "CONFIG_..." is bit unusual, but should
+ * be fast ;-) We don't even try to really parse the header files, but
+ * merely grep, i.e. if CONFIG_FOO is mentioned in a comment, it will
+ * be picked up as well. It's not a problem with respect to
+ * correctness, since that can only give too many dependencies, thus
+ * we cannot miss a rebuild. Since people tend to not mention totally
+ * unrelated CONFIG_ options all over the place, it's not an
+ * efficiency problem either.
+ *
+ * (Note: it'd be easy to port over the complete mkdep state machine,
+ *  but I don't think the added complexity is worth it)
+ */
+/*
+ * Note 2: if somebody writes HELLO_CONFIG_BOOM in a file, it will depend onto
+ * CONFIG_BOOM. This could seem a bug (not too hard to fix), but please do not
+ * fix it! Some UserModeLinux files (look at arch/um/) call CONFIG_BOOM as
+ * UML_CONFIG_BOOM, to avoid conflicts with /usr/include/linux/autoconf.h,
+ * through arch/um/include/uml-config.h; this fixdep "bug" makes sure that
+ * those files will have correct dependencies.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <limits.h>
+#include <ctype.h>
+#include <arpa/inet.h>
+
+#define INT_CONF ntohl(0x434f4e46)
+#define INT_ONFI ntohl(0x4f4e4649)
+#define INT_NFIG ntohl(0x4e464947)
+#define INT_FIG_ ntohl(0x4649475f)
+
+char *target;
+char *depfile;
+char *cmdline;
+
+void usage(void)
+
+{
+        fprintf(stderr, "Usage: fixdep <depfile> <target> <cmdline>\n");
+        exit(1);
+}
+
+/*
+ * Print out the commandline prefixed with cmd_<target filename> :=
+ */
+void print_cmdline(void)
+{
+        printf("cmd_%s := %s\n\n", target, cmdline);
+}
+
+char * str_config  = NULL;
+int    size_config = 0;
+int    len_config  = 0;
+
+/*
+ * Grow the configuration string to a desired length.
+ * Usually the first growth is plenty.
+ */
+void grow_config(int len)
+{
+        while (len_config + len > size_config) {
+                if (size_config == 0)
+                        size_config = 2048;
+                str_config = realloc(str_config, size_config *= 2);
+                if (str_config == NULL)
+                        { perror("fixdep:malloc"); exit(1); }
+        }
+}
+
+
+
+/*
+ * Lookup a value in the configuration string.
+ */
+int is_defined_config(const char * name, int len)
+{
+        const char * pconfig;
+        const char * plast = str_config + len_config - len;
+        for ( pconfig = str_config + 1; pconfig < plast; pconfig++ ) {
+                if (pconfig[ -1] == '\n'
+                &&  pconfig[len] == '\n'
+                &&  !memcmp(pconfig, name, len))
+                        return 1;
+        }
+        return 0;
+}
+
+/*
+ * Add a new value to the configuration string.
+ */
+void define_config(const char * name, int len)
+{
+        grow_config(len + 1);
+
+        memcpy(str_config+len_config, name, len);
+        len_config += len;
+        str_config[len_config++] = '\n';
+}
+
+/*
+ * Clear the set of configuration strings.
+ */
+void clear_config(void)
+{
+        len_config = 0;
+        define_config("", 0);
+}
+
+/*
+ * Record the use of a CONFIG_* word.
+ */
+void use_config(char *m, int slen)
+{
+        char s[PATH_MAX];
+        char *p;
+
+        if (is_defined_config(m, slen))
+            return;
+
+        define_config(m, slen);
+
+        memcpy(s, m, slen); s[slen] = 0;
+
+        for (p = s; p < s + slen; p++) {
+                if (*p == '_')
+                        *p = '/';
+                else
+                        *p = tolower((int)*p);
+        }
+        printf("    $(wildcard include/config/%s.h) \\\n", s);
+}
+
+void parse_config_file(char *map, size_t len)
+{
+        int *end = (int *) (map + len);
+        /* start at +1, so that p can never be < map */
+        int *m   = (int *) map + 1;
+        char *p, *q;
+
+        for (; m < end; m++) {
+                if (*m == INT_CONF) { p = (char *) m  ; goto conf; }
+                if (*m == INT_ONFI) { p = (char *) m-1; goto conf; }
+                if (*m == INT_NFIG) { p = (char *) m-2; goto conf; }
+                if (*m == INT_FIG_) { p = (char *) m-3; goto conf; }
+                continue;
+        conf:
+                if (p > map + len - 7)
+                        continue;
+                if (memcmp(p, "CONFIG_", 7))
+                        continue;
+                for (q = p + 7; q < map + len; q++) {
+                        if (!(isalnum(*q) || *q == '_'))
+                                goto found;
+                }
+                continue;
+
+        found:
+                use_config(p+7, q-p-7);
+        }
+}
+
+/* test is s ends in sub */
+int strrcmp(char *s, char *sub)
+{
+        int slen = strlen(s);
+        int sublen = strlen(sub);
+
+        if (sublen > slen)
+                return 1;
+
+        return memcmp(s + slen - sublen, sub, sublen);
+}
+
+void do_config_file(char *filename)
+{
+        struct stat st;
+        int fd;
+        void *map;
+
+        fd = open(filename, O_RDONLY);
+        if (fd < 0) {
+                fprintf(stderr, "fixdep: ");
+                perror(filename);
+                exit(2);
+        }
+        fstat(fd, &st);
+        if (st.st_size == 0) {
+                close(fd);
+                return;
+        }
+        map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+        if ((long) map == -1) {
+                perror("fixdep: mmap");
+                close(fd);
+                return;
+        }
+
+        parse_config_file(map, st.st_size);
+
+        munmap(map, st.st_size);
+
+        close(fd);
+}
+
+void parse_dep_file(void *map, size_t len)
+{
+        char *m = map;
+        char *end = m + len;
+        char *p;
+        char s[PATH_MAX];
+
+        p = strchr(m, ':');
+        if (!p) {
+                fprintf(stderr, "fixdep: parse error\n");
+                exit(1);
+        }
+        memcpy(s, m, p-m); s[p-m] = 0;
+        printf("deps_%s := \\\n", target);
+        m = p+1;
+
+        clear_config();
+
+        while (m < end) {
+                while (m < end && (*m == ' ' || *m == '\\' || *m == '\n'))
+                        m++;
+                p = m;
+                while (p < end && *p != ' ') p++;
+                if (p == end) {
+                        do p--; while (!isalnum(*p));
+                        p++;
+                }
+                memcpy(s, m, p-m); s[p-m] = 0;
+                if (strrcmp(s, "include/autoconf.h") &&
+                    strrcmp(s, "arch/um/include/uml-config.h") &&
+                    strrcmp(s, ".ver")) {
+                        printf("  %s \\\n", s);
+                        do_config_file(s);
+                }
+                m = p + 1;
+        }
+        printf("\n%s: $(deps_%s)\n\n", target, target);
+        printf("$(deps_%s):\n", target);
+}
+
+void print_deps(void)
+{
+        struct stat st;
+        int fd;
+        void *map;
+
+        fd = open(depfile, O_RDONLY);
+        if (fd < 0) {
+                fprintf(stderr, "fixdep: ");
+                perror(depfile);
+                exit(2);
+        }
+        fstat(fd, &st);
+        if (st.st_size == 0) {
+                fprintf(stderr,"fixdep: %s is empty\n",depfile);
+                close(fd);
+                return;
+        }
+        map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+        if ((long) map == -1) {
+                perror("fixdep: mmap");
+                close(fd);
+                return;
+        }
+
+        parse_dep_file(map, st.st_size);
+
+        munmap(map, st.st_size);
+
+        close(fd);
+}
+
+void traps(void)
+{
+        static char test[] __attribute__((aligned(sizeof(int)))) = "CONF";
+
+        if (*(int *)test != INT_CONF) {
+                fprintf(stderr, "fixdep: sizeof(int) != 4 or wrong endianess? %#x\n",
+                        *(int *)test);
+                exit(2);
+        }
+}
+
+int main(int argc, char *argv[])
+{
+        traps();
+
+        if (argc != 4)
+                usage();
+
+        depfile = argv[1];
+        target = argv[2];
+        cmdline = argv[3];
+
+        print_cmdline();
+        print_deps();
+
+        return 0;
+}
diff --git a/scripts/basic/split-include.c b/scripts/basic/split-include.c
new file mode 100644
index 000000000..459c45276
--- /dev/null
+++ b/scripts/basic/split-include.c
@@ -0,0 +1,226 @@
+/*
+ * split-include.c
+ *
+ * Copyright abandoned, Michael Chastain, <mailto:mec@shout.net>.
+ * This is a C version of syncdep.pl by Werner Almesberger.
+ *
+ * This program takes autoconf.h as input and outputs a directory full
+ * of one-line include files, merging onto the old values.
+ *
+ * Think of the configuration options as key-value pairs.  Then there
+ * are five cases:
+ *
+ *    key      old value   new value   action
+ *
+ *    KEY-1    VALUE-1     VALUE-1     leave file alone
+ *    KEY-2    VALUE-2A    VALUE-2B    write VALUE-2B into file
+ *    KEY-3    -           VALUE-3     write VALUE-3  into file
+ *    KEY-4    VALUE-4     -           write an empty file
+ *    KEY-5    (empty)     -           leave old empty file alone
+ */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define ERROR_EXIT(strExit)                                             \
+    {                                                                   \
+        const int errnoSave = errno;                                    \
+        fprintf(stderr, "%s: ", str_my_name);                           \
+        errno = errnoSave;                                              \
+        perror((strExit));                                              \
+        exit(1);                                                        \
+    }
+
+
+
+int main(int argc, const char * argv [])
+{
+    const char * str_my_name;
+    const char * str_file_autoconf;
+    const char * str_dir_config;
+
+    FILE * fp_config;
+    FILE * fp_target;
+    FILE * fp_find;
+
+    int buffer_size;
+
+    char * line;
+    char * old_line;
+    char * list_target;
+    char * ptarget;
+
+    struct stat stat_buf;
+
+    /* Check arg count. */
+    if (argc != 3)
+    {
+        fprintf(stderr, "%s: wrong number of arguments.\n", argv[0]);
+        exit(1);
+    }
+
+    str_my_name       = argv[0];
+    str_file_autoconf = argv[1];
+    str_dir_config    = argv[2];
+
+    /* Find a buffer size. */
+    if (stat(str_file_autoconf, &stat_buf) != 0)
+        ERROR_EXIT(str_file_autoconf);
+    buffer_size = 2 * stat_buf.st_size + 4096;
+
+    /* Allocate buffers. */
+    if ( (line        = malloc(buffer_size)) == NULL
+    ||   (old_line    = malloc(buffer_size)) == NULL
+    ||   (list_target = malloc(buffer_size)) == NULL )
+        ERROR_EXIT(str_file_autoconf);
+
+    /* Open autoconfig file. */
+    if ((fp_config = fopen(str_file_autoconf, "r")) == NULL)
+        ERROR_EXIT(str_file_autoconf);
+
+    /* Make output directory if needed. */
+    if (stat(str_dir_config, &stat_buf) != 0)
+    {
+        if (mkdir(str_dir_config, 0755) != 0)
+            ERROR_EXIT(str_dir_config);
+    }
+
+    /* Change to output directory. */
+    if (chdir(str_dir_config) != 0)
+        ERROR_EXIT(str_dir_config);
+
+    /* Put initial separator into target list. */
+    ptarget = list_target;
+    *ptarget++ = '\n';
+
+    /* Read config lines. */
+    while (fgets(line, buffer_size, fp_config))
+    {
+        const char * str_config;
+        int is_same;
+        int itarget;
+
+        if (line[0] != '#')
+            continue;
+        if ((str_config = strstr(line, "CONFIG_")) == NULL)
+            continue;
+
+        /* Make the output file name. */
+        str_config += sizeof("CONFIG_") - 1;
+        for (itarget = 0; !isspace(str_config[itarget]); itarget++)
+        {
+            int c = (unsigned char) str_config[itarget];
+            if (isupper(c)) c = tolower(c);
+            if (c == '_')   c = '/';
+            ptarget[itarget] = c;
+        }
+        ptarget[itarget++] = '.';
+        ptarget[itarget++] = 'h';
+        ptarget[itarget++] = '\0';
+
+        /* Check for existing file. */
+        is_same = 0;
+        if ((fp_target = fopen(ptarget, "r")) != NULL)
+        {
+            fgets(old_line, buffer_size, fp_target);
+            if (fclose(fp_target) != 0)
+                ERROR_EXIT(ptarget);
+            if (!strcmp(line, old_line))
+                is_same = 1;
+        }
+
+        if (!is_same)
+        {
+            /* Auto-create directories. */
+            int islash;
+            for (islash = 0; islash < itarget; islash++)
+            {
+                if (ptarget[islash] == '/')
+                {
+                    ptarget[islash] = '\0';
+                    if (stat(ptarget, &stat_buf) != 0
+                    &&  mkdir(ptarget, 0755)     != 0)
+                        ERROR_EXIT( ptarget );
+                    ptarget[islash] = '/';
+                }
+            }
+
+            /* Write the file. */
+            if ((fp_target = fopen(ptarget, "w" )) == NULL)
+                ERROR_EXIT(ptarget);
+            fputs(line, fp_target);
+            if (ferror(fp_target) || fclose(fp_target) != 0)
+                ERROR_EXIT(ptarget);
+        }
+
+        /* Update target list */
+        ptarget += itarget;
+        *(ptarget-1) = '\n';
+    }
+
+    /*
+     * Close autoconfig file.
+     * Terminate the target list.
+     */
+    if (fclose(fp_config) != 0)
+        ERROR_EXIT(str_file_autoconf);
+    *ptarget = '\0';
+
+    /*
+     * Fix up existing files which have no new value.
+     * This is Case 4 and Case 5.
+     *
+     * I re-read the tree and filter it against list_target.
+     * This is crude.  But it avoids data copies.  Also, list_target
+     * is compact and contiguous, so it easily fits into cache.
+     *
+     * Notice that list_target contains strings separated by \n,
+     * with a \n before the first string and after the last.
+     * fgets gives the incoming names a terminating \n.
+     * So by having an initial \n, strstr will find exact matches.
+     */
+
+    fp_find = popen("find * -type f -name \"*.h\" -print", "r");
+    if (fp_find == 0)
+        ERROR_EXIT( "find" );
+
+    line[0] = '\n';
+    while (fgets(line+1, buffer_size, fp_find))
+    {
+        if (strstr(list_target, line) == NULL)
+        {
+            /*
+             * This is an old file with no CONFIG_* flag in autoconf.h.
+             */
+
+            /* First strip the \n. */
+            line[strlen(line)-1] = '\0';
+
+            /* Grab size. */
+            if (stat(line+1, &stat_buf) != 0)
+                ERROR_EXIT(line);
+
+            /* If file is not empty, make it empty and give it a fresh date. */
+            if (stat_buf.st_size != 0)
+            {
+                if ((fp_target = fopen(line+1, "w")) == NULL)
+                    ERROR_EXIT(line);
+                if (fclose(fp_target) != 0)
+                    ERROR_EXIT(line);
+            }
+        }
+    }
+
+    if (pclose(fp_find) != 0)
+        ERROR_EXIT("find");
+
+    return 0;
+}