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feat: POSIX libc surface, native binutils (as/ld/ar run on MontaukOS)

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Grow the Montauk libc enough to cross-build binutils 2.43.1 with
--host=x86_64-montauk. gas, ld, ar, nm, objcopy, objdump, readelf,
ranlib, strip and friends now link as native ET_EXEC Montauk binaries
(staged stripped in toolchain/native/, not yet shipped in the image).

New libc surface: full Linux errno and signal sets, O_* flags with
real O_EXCL/O_APPEND semantics, unlink/rmdir/dup/dup2/getpid/_exit,
kill (SYS_KILL), fcntl, fileno/fdopen, putc/getchar/rewind,
ctime/asctime, strtoll/strtoull/atoll, bsearch, mkstemp/mktemp,
realpath (lexical, drive-prefix aware), mbstowcs/mblen, chmod/fchmod/
umask/utime no-ops (VFS has no modes or settable times), full struct
stat with fake inodes, sscanf field widths (bounded conversions),
SCN*/PRI* completions, wait/waitpid over SYS_WAITPID, and new headers
sys/wait.h, sys/param.h, utime.h, wchar.h, memory.h.

fork/exec/pipe are declared but fail with ENOSYS: binutils never
spawns, and real process plumbing is the posix_spawn milestone, which
needs kernel support (exit status reporting, fd redirection).

TCC's montauk_compat.h shims (unlink, chmod, execvp, realpath, fdopen,
strtoll, strtoull) are retired in favor of the libc versions.

Co-Authored-By: Claude Fable 5 <[email protected]>
This commit is contained in:
daniel
2026-07-14 10:55:39 +02:00
co-authored by Claude Fable 5
parent 648f7111c0
commit bd9158fdcc
24 changed files with 875 additions and 136 deletions
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programs/include/libc/stdlib.h
+11 -1
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@@ -49,10 +49,20 @@ int unsetenv(const char *name);
int putenv(char *string);
void qsort(void *base, size_t nmemb, size_t size,
int (*compar)(const void *, const void *));
int (*compar)(const void *, const void *));
void *bsearch(const void *key, const void *base, size_t nmemb, size_t size,
int (*compar)(const void *, const void *));
long strtol(const char *nptr, char **endptr, int base);
unsigned long strtoul(const char *nptr, char **endptr, int base);
long long strtoll(const char *nptr, char **endptr, int base);
unsigned long long strtoull(const char *nptr, char **endptr, int base);
long long atoll(const char *nptr);
int mkstemp(char *template_);
char *mktemp(char *template_);
char *realpath(const char *path, char *resolved);
size_t mbstowcs(wchar_t *dst, const char *src, size_t n);
int mblen(const char *s, size_t n);
double strtod(const char *nptr, char **endptr);
float strtof(const char *nptr, char **endptr);
long double strtold(const char *nptr, char **endptr);