Makefile

   1 # These variables are specifically meant to be overridable via the make
   2 # command-line.
   3 # ?= doesn't work for CC and AR because make has a default value for them.
   4 ifeq ($(origin CC), default)
   5 CC := clang
   6 endif
   7 NM ?= $(patsubst %clang,%llvm-nm,$(filter-out ccache sccache,$(CC)))
   8 ifeq ($(origin AR), default)
   9 AR = $(patsubst %clang,%llvm-ar,$(filter-out ccache sccache,$(CC)))
  10 endif
  11 EXTRA_CFLAGS ?= -O2 -DNDEBUG
  12 # The directory where we build the sysroot.
  13 SYSROOT ?= $(CURDIR)/sysroot
  14 # A directory to install to for "make install".
  15 INSTALL_DIR ?= /usr/local
  16 # single or posix; note that pthread support is still a work-in-progress.
  17 THREAD_MODEL ?= single
  18 # dlmalloc or none
  19 MALLOC_IMPL ?= dlmalloc
  20 # yes or no
  21 BUILD_LIBC_TOP_HALF ?= yes
  22 # The directory where we're store intermediate artifacts.
  23 OBJDIR ?= $(CURDIR)/build
  24
  25 # When the length is no larger than this threshold, we consider the
  26 # overhead of bulk memory opcodes to outweigh the performance benefit,
  27 # and fall back to the original musl implementation. See
  28 # https://github.com/WebAssembly/wasi-libc/pull/263 for relevant
  29 # discussion
  30 BULK_MEMORY_THRESHOLD ?= 32
  31
  32 # Variables from this point on are not meant to be overridable via the
  33 # make command-line.
  34
  35 # Set the target variables. Multiarch triples notably omit the vendor field,
  36 # which happens to be what we do for the main target triple too.
  37 TARGET_TRIPLE = wasm32-wasi
  38 MULTIARCH_TRIPLE = wasm32-wasi
  39
  40 # These variables describe the locations of various files and directories in
  41 # the source tree.
  42 DLMALLOC_DIR = $(CURDIR)/dlmalloc
  43 DLMALLOC_SRC_DIR = $(DLMALLOC_DIR)/src
  44 DLMALLOC_SOURCES = $(DLMALLOC_SRC_DIR)/dlmalloc.c
  45 DLMALLOC_INC = $(DLMALLOC_DIR)/include
  46 LIBC_BOTTOM_HALF_DIR = $(CURDIR)/libc-bottom-half
  47 LIBC_BOTTOM_HALF_CLOUDLIBC_SRC = $(LIBC_BOTTOM_HALF_DIR)/cloudlibc/src
  48 LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_INC = $(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)/include
  49 LIBC_BOTTOM_HALF_HEADERS_PUBLIC = $(LIBC_BOTTOM_HALF_DIR)/headers/public
  50 LIBC_BOTTOM_HALF_HEADERS_PRIVATE = $(LIBC_BOTTOM_HALF_DIR)/headers/private
  51 LIBC_BOTTOM_HALF_SOURCES = $(LIBC_BOTTOM_HALF_DIR)/sources
  52 LIBC_BOTTOM_HALF_ALL_SOURCES = \
  53     $(sort \
  54     $(shell find $(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC) -name \*.c) \
  55     $(shell find $(LIBC_BOTTOM_HALF_SOURCES) -name \*.c))
  56
  57 # FIXME(https://reviews.llvm.org/D85567) - due to a bug in LLD the weak
  58 # references to a function defined in `chdir.c` only work if `chdir.c` is at the
  59 # end of the archive, but once that LLD review lands and propagates into LLVM
  60 # then we don't have to do this.
  61 LIBC_BOTTOM_HALF_ALL_SOURCES := $(filter-out $(LIBC_BOTTOM_HALF_SOURCES)/chdir.c,$(LIBC_BOTTOM_HALF_ALL_SOURCES))
  62 LIBC_BOTTOM_HALF_ALL_SOURCES := $(LIBC_BOTTOM_HALF_ALL_SOURCES) $(LIBC_BOTTOM_HALF_SOURCES)/chdir.c
  63
  64 LIBWASI_EMULATED_MMAN_SOURCES = \
  65     $(sort $(shell find $(LIBC_BOTTOM_HALF_DIR)/mman -name \*.c))
  66 LIBWASI_EMULATED_PROCESS_CLOCKS_SOURCES = \
  67     $(sort $(shell find $(LIBC_BOTTOM_HALF_DIR)/clocks -name \*.c))
  68 LIBWASI_EMULATED_GETPID_SOURCES = \
  69     $(sort $(shell find $(LIBC_BOTTOM_HALF_DIR)/getpid -name \*.c))
  70 LIBWASI_EMULATED_SIGNAL_SOURCES = \
  71     $(sort $(shell find $(LIBC_BOTTOM_HALF_DIR)/signal -name \*.c))
  72 LIBWASI_EMULATED_SIGNAL_MUSL_SOURCES = \
  73     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/signal/psignal.c \
  74     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/strsignal.c
  75 LIBC_BOTTOM_HALF_CRT_SOURCES = $(wildcard $(LIBC_BOTTOM_HALF_DIR)/crt/*.c)
  76 LIBC_TOP_HALF_DIR = $(CURDIR)/libc-top-half
  77 LIBC_TOP_HALF_MUSL_DIR = $(LIBC_TOP_HALF_DIR)/musl
  78 LIBC_TOP_HALF_MUSL_SRC_DIR = $(LIBC_TOP_HALF_MUSL_DIR)/src
  79 LIBC_TOP_HALF_MUSL_INC = $(LIBC_TOP_HALF_MUSL_DIR)/include
  80 LIBC_TOP_HALF_MUSL_SOURCES = \
  81     $(addprefix $(LIBC_TOP_HALF_MUSL_SRC_DIR)/, \
  82         misc/a64l.c \
  83         misc/basename.c \
  84         misc/dirname.c \
  85         misc/ffs.c \
  86         misc/ffsl.c \
  87         misc/ffsll.c \
  88         misc/fmtmsg.c \
  89         misc/getdomainname.c \
  90         misc/gethostid.c \
  91         misc/getopt.c \
  92         misc/getopt_long.c \
  93         misc/getsubopt.c \
  94         misc/uname.c \
  95         misc/nftw.c \
  96         errno/strerror.c \
  97         network/htonl.c \
  98         network/htons.c \
  99         network/ntohl.c \
 100         network/ntohs.c \
 101         network/inet_ntop.c \
 102         network/inet_pton.c \
 103         network/inet_aton.c \
 104         network/in6addr_any.c \
 105         network/in6addr_loopback.c \
 106         fenv/fenv.c \
 107         fenv/fesetround.c \
 108         fenv/feupdateenv.c \
 109         fenv/fesetexceptflag.c \
 110         fenv/fegetexceptflag.c \
 111         fenv/feholdexcept.c \
 112         exit/exit.c \
 113         exit/atexit.c \
 114         exit/assert.c \
 115         exit/quick_exit.c \
 116         exit/at_quick_exit.c \
 117         time/strftime.c \
 118         time/asctime.c \
 119         time/asctime_r.c \
 120         time/ctime.c \
 121         time/ctime_r.c \
 122         time/wcsftime.c \
 123         time/strptime.c \
 124         time/difftime.c \
 125         time/timegm.c \
 126         time/ftime.c \
 127         time/gmtime.c \
 128         time/gmtime_r.c \
 129         time/timespec_get.c \
 130         time/getdate.c \
 131         time/localtime.c \
 132         time/localtime_r.c \
 133         time/mktime.c \
 134         time/__tm_to_secs.c \
 135         time/__month_to_secs.c \
 136         time/__secs_to_tm.c \
 137         time/__year_to_secs.c \
 138         time/__tz.c \
 139         fcntl/creat.c \
 140         dirent/alphasort.c \
 141         dirent/versionsort.c \
 142         env/clearenv.c \
 143         env/getenv.c \
 144         env/putenv.c \
 145         env/setenv.c \
 146         env/unsetenv.c \
 147         unistd/posix_close.c \
 148         stat/futimesat.c \
 149         legacy/getpagesize.c \
 150         thread/thrd_sleep.c \
 151     ) \
 152     $(filter-out %/procfdname.c %/syscall.c %/syscall_ret.c %/vdso.c %/version.c, \
 153                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal/*.c)) \
 154     $(filter-out %/flockfile.c %/funlockfile.c %/__lockfile.c %/ftrylockfile.c \
 155                  %/rename.c \
 156                  %/tmpnam.c %/tmpfile.c %/tempnam.c \
 157                  %/popen.c %/pclose.c \
 158                  %/remove.c \
 159                  %/gets.c, \
 160                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/*.c)) \
 161     $(filter-out %/strsignal.c, \
 162                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/*.c)) \
 163     $(filter-out %/dcngettext.c %/textdomain.c %/bind_textdomain_codeset.c, \
 164                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/locale/*.c)) \
 165     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdlib/*.c) \
 166     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/search/*.c) \
 167     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/multibyte/*.c) \
 168     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/regex/*.c) \
 169     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/prng/*.c) \
 170     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/conf/*.c) \
 171     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/ctype/*.c) \
 172     $(filter-out %/__signbit.c %/__signbitf.c %/__signbitl.c \
 173                  %/__fpclassify.c %/__fpclassifyf.c %/__fpclassifyl.c \
 174                  %/ceilf.c %/ceil.c \
 175                  %/floorf.c %/floor.c \
 176                  %/truncf.c %/trunc.c \
 177                  %/rintf.c %/rint.c \
 178                  %/nearbyintf.c %/nearbyint.c \
 179                  %/sqrtf.c %/sqrt.c \
 180                  %/fabsf.c %/fabs.c \
 181                  %/copysignf.c %/copysign.c \
 182                  %/fminf.c %/fmaxf.c \
 183                  %/fmin.c %/fmax.c, \
 184                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/math/*.c)) \
 185     $(filter-out %/crealf.c %/creal.c %creall.c \
 186                  %/cimagf.c %/cimag.c %cimagl.c, \
 187                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/complex/*.c)) \
 188     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/crypt/*.c)
 189
 190 ifeq ($(THREAD_MODEL), posix)
 191 LIBC_TOP_HALF_MUSL_SOURCES += \
 192     $(addprefix $(LIBC_TOP_HALF_MUSL_SRC_DIR)/, \
 193         thread/__lock.c \
 194         thread/__wait.c \
 195         thread/__timedwait.c \
 196         thread/pthread_cleanup_push.c \
 197         thread/pthread_cond_broadcast.c \
 198         thread/pthread_cond_destroy.c \
 199         thread/pthread_cond_init.c \
 200         thread/pthread_cond_signal.c \
 201         thread/pthread_cond_timedwait.c \
 202         thread/pthread_cond_wait.c \
 203         thread/pthread_condattr_destroy.c \
 204         thread/pthread_condattr_init.c \
 205         thread/pthread_condattr_setclock.c \
 206         thread/pthread_condattr_setpshared.c \
 207         thread/pthread_create.c \
 208         thread/pthread_join.c \
 209         thread/pthread_mutex_consistent.c \
 210         thread/pthread_mutex_destroy.c \
 211         thread/pthread_mutex_init.c \
 212         thread/pthread_mutex_getprioceiling.c \
 213         thread/pthread_mutex_lock.c \
 214         thread/pthread_mutex_timedlock.c \
 215         thread/pthread_mutex_trylock.c \
 216         thread/pthread_mutex_unlock.c \
 217         thread/pthread_mutexattr_destroy.c \
 218         thread/pthread_mutexattr_init.c \
 219         thread/pthread_mutexattr_setprotocol.c \
 220         thread/pthread_mutexattr_setpshared.c \
 221         thread/pthread_mutexattr_setrobust.c \
 222         thread/pthread_mutexattr_settype.c \
 223         thread/pthread_rwlock_destroy.c \
 224         thread/pthread_rwlock_init.c \
 225         thread/pthread_rwlock_rdlock.c \
 226         thread/pthread_rwlock_timedrdlock.c \
 227         thread/pthread_rwlock_timedwrlock.c \
 228         thread/pthread_rwlock_tryrdlock.c \
 229         thread/pthread_rwlock_trywrlock.c \
 230         thread/pthread_rwlock_unlock.c \
 231         thread/pthread_rwlock_wrlock.c \
 232         thread/pthread_rwlockattr_destroy.c \
 233         thread/pthread_rwlockattr_init.c \
 234         thread/pthread_rwlockattr_setpshared.c \
 235         thread/pthread_setcancelstate.c \
 236         thread/pthread_testcancel.c \
 237         thread/sem_destroy.c \
 238         thread/sem_getvalue.c \
 239         thread/sem_init.c \
 240         thread/sem_post.c \
 241         thread/sem_timedwait.c \
 242         thread/sem_trywait.c \
 243         thread/sem_wait.c \
 244     )
 245 endif
 246
 247 MUSL_PRINTSCAN_SOURCES = \
 248     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal/floatscan.c \
 249     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/vfprintf.c \
 250     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/vfwprintf.c \
 251     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/vfscanf.c \
 252     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdlib/strtod.c \
 253     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdlib/wcstod.c
 254 BULK_MEMORY_SOURCES = \
 255     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memcpy.c \
 256     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memmove.c \
 257     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memset.c
 258 LIBC_TOP_HALF_HEADERS_PRIVATE = $(LIBC_TOP_HALF_DIR)/headers/private
 259 LIBC_TOP_HALF_SOURCES = $(LIBC_TOP_HALF_DIR)/sources
 260 LIBC_TOP_HALF_ALL_SOURCES = \
 261     $(LIBC_TOP_HALF_MUSL_SOURCES) \
 262     $(sort $(shell find $(LIBC_TOP_HALF_SOURCES) -name \*.c))
 263
 264 # Add any extra flags
 265 CFLAGS = $(EXTRA_CFLAGS)
 266 # Set the target.
 267 CFLAGS += --target=$(TARGET_TRIPLE)
 268 # WebAssembly floating-point match doesn't trap.
 269 # TODO: Add -fno-signaling-nans when the compiler supports it.
 270 CFLAGS += -fno-trapping-math
 271 # Add all warnings, but disable a few which occur in third-party code.
 272 CFLAGS += -Wall -Wextra -Werror \
 273   -Wno-null-pointer-arithmetic \
 274   -Wno-unused-parameter \
 275   -Wno-sign-compare \
 276   -Wno-unused-variable \
 277   -Wno-unused-function \
 278   -Wno-ignored-attributes \
 279   -Wno-missing-braces \
 280   -Wno-ignored-pragmas \
 281   -Wno-unused-but-set-variable \
 282   -Wno-unknown-warning-option
 283
 284 # Configure support for threads.
 285 ifeq ($(THREAD_MODEL), single)
 286 CFLAGS += -mthread-model single
 287 endif
 288 ifeq ($(THREAD_MODEL), posix)
 289 # Specify the tls-model until LLVM 15 is released (which should contain
 290 # https://reviews.llvm.org/D130053).
 291 CFLAGS += -mthread-model posix -pthread -ftls-model=local-exec
 292
 293 # Include cloudlib's directory to access the structure definition of clockid_t
 294 CFLAGS += -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)
 295 endif
 296
 297 # Expose the public headers to the implementation. We use `-isystem` for
 298 # purpose for two reasons:
 299 #
 300 # 1. It only does `<...>` not `"...."` lookup. We are making a libc,
 301 #    which is a system library, so all public headers should be
 302 #    accessible via `<...>` and never also need `"..."`. `-isystem` main
 303 #    purpose is to only effect `<...>` lookup.
 304 #
 305 # 2. The `-I` for private headers added for specific C files below
 306 #    should come earlier in the search path, so they can "override"
 307 #    and/or `#include_next` the public headers. `-isystem` (like
 308 #    `-idirafter`) comes later in the search path than `-I`.
 309 CFLAGS += -isystem "$(SYSROOT_INC)"
 310
 311 # These variables describe the locations of various files and directories in
 312 # the build tree.
 313 objs = $(patsubst $(CURDIR)/%.c,$(OBJDIR)/%.o,$(1))
 314 DLMALLOC_OBJS = $(call objs,$(DLMALLOC_SOURCES))
 315 LIBC_BOTTOM_HALF_ALL_OBJS = $(call objs,$(LIBC_BOTTOM_HALF_ALL_SOURCES))
 316 LIBC_TOP_HALF_ALL_OBJS = $(call objs,$(LIBC_TOP_HALF_ALL_SOURCES))
 317 ifeq ($(MALLOC_IMPL),dlmalloc)
 318 LIBC_OBJS += $(DLMALLOC_OBJS)
 319 else ifeq ($(MALLOC_IMPL),none)
 320 # No object files to add.
 321 else
 322 $(error unknown malloc implementation $(MALLOC_IMPL))
 323 endif
 324 # Add libc-bottom-half's objects.
 325 LIBC_OBJS += $(LIBC_BOTTOM_HALF_ALL_OBJS)
 326 ifeq ($(BUILD_LIBC_TOP_HALF),yes)
 327 # libc-top-half is musl.
 328 LIBC_OBJS += $(LIBC_TOP_HALF_ALL_OBJS)
 329 endif
 330 MUSL_PRINTSCAN_OBJS = $(call objs,$(MUSL_PRINTSCAN_SOURCES))
 331 MUSL_PRINTSCAN_LONG_DOUBLE_OBJS = $(patsubst %.o,%.long-double.o,$(MUSL_PRINTSCAN_OBJS))
 332 MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS = $(patsubst %.o,%.no-floating-point.o,$(MUSL_PRINTSCAN_OBJS))
 333 BULK_MEMORY_OBJS = $(call objs,$(BULK_MEMORY_SOURCES))
 334 LIBWASI_EMULATED_MMAN_OBJS = $(call objs,$(LIBWASI_EMULATED_MMAN_SOURCES))
 335 LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS = $(call objs,$(LIBWASI_EMULATED_PROCESS_CLOCKS_SOURCES))
 336 LIBWASI_EMULATED_GETPID_OBJS = $(call objs,$(LIBWASI_EMULATED_GETPID_SOURCES))
 337 LIBWASI_EMULATED_SIGNAL_OBJS = $(call objs,$(LIBWASI_EMULATED_SIGNAL_SOURCES))
 338 LIBWASI_EMULATED_SIGNAL_MUSL_OBJS = $(call objs,$(LIBWASI_EMULATED_SIGNAL_MUSL_SOURCES))
 339
 340 # These variables describe the locations of various files and
 341 # directories in the generated sysroot tree.
 342 SYSROOT_LIB := $(SYSROOT)/lib/$(MULTIARCH_TRIPLE)
 343 SYSROOT_INC = $(SYSROOT)/include
 344 SYSROOT_SHARE = $(SYSROOT)/share/$(MULTIARCH_TRIPLE)
 345
 346 # Files from musl's include directory that we don't want to install in the
 347 # sysroot's include directory.
 348 MUSL_OMIT_HEADERS :=
 349
 350 # Remove files which aren't headers (we generate alltypes.h below).
 351 MUSL_OMIT_HEADERS += \
 352     "bits/syscall.h.in" \
 353     "bits/alltypes.h.in" \
 354     "alltypes.h.in"
 355
 356 # Use the compiler's version of these headers.
 357 MUSL_OMIT_HEADERS += \
 358     "stdarg.h" \
 359     "stddef.h"
 360
 361 # Use the WASI errno definitions.
 362 MUSL_OMIT_HEADERS += \
 363     "bits/errno.h"
 364
 365 # Remove headers that aren't supported yet or that aren't relevant for WASI.
 366 MUSL_OMIT_HEADERS += \
 367     "sys/procfs.h" \
 368     "sys/user.h" \
 369     "sys/kd.h" "sys/vt.h" "sys/soundcard.h" "sys/sem.h" \
 370     "sys/shm.h" "sys/msg.h" "sys/ipc.h" "sys/ptrace.h" \
 371     "sys/statfs.h" \
 372     "bits/kd.h" "bits/vt.h" "bits/soundcard.h" "bits/sem.h" \
 373     "bits/shm.h" "bits/msg.h" "bits/ipc.h" "bits/ptrace.h" \
 374     "bits/statfs.h" \
 375     "sys/vfs.h" \
 376     "sys/statvfs.h" \
 377     "syslog.h" "sys/syslog.h" \
 378     "wait.h" "sys/wait.h" \
 379     "ucontext.h" "sys/ucontext.h" \
 380     "paths.h" \
 381     "utmp.h" "utmpx.h" \
 382     "lastlog.h" \
 383     "sys/acct.h" \
 384     "sys/cachectl.h" \
 385     "sys/epoll.h" "sys/reboot.h" "sys/swap.h" \
 386     "sys/sendfile.h" "sys/inotify.h" \
 387     "sys/quota.h" \
 388     "sys/klog.h" \
 389     "sys/fsuid.h" \
 390     "sys/io.h" \
 391     "sys/prctl.h" \
 392     "sys/mtio.h" \
 393     "sys/mount.h" \
 394     "sys/fanotify.h" \
 395     "sys/personality.h" \
 396     "elf.h" "link.h" "bits/link.h" \
 397     "scsi/scsi.h" "scsi/scsi_ioctl.h" "scsi/sg.h" \
 398     "sys/auxv.h" \
 399     "pwd.h" "shadow.h" "grp.h" \
 400     "mntent.h" \
 401     "netdb.h" \
 402     "resolv.h" \
 403     "pty.h" \
 404     "dlfcn.h" \
 405     "setjmp.h" \
 406     "ulimit.h" \
 407     "sys/xattr.h" \
 408     "wordexp.h" \
 409     "spawn.h" \
 410     "sys/membarrier.h" \
 411     "sys/signalfd.h" \
 412     "termios.h" \
 413     "sys/termios.h" \
 414     "bits/termios.h" \
 415     "net/if.h" \
 416     "net/if_arp.h" \
 417     "net/ethernet.h" \
 418     "net/route.h" \
 419     "netinet/if_ether.h" \
 420     "netinet/ether.h" \
 421     "sys/timerfd.h" \
 422     "libintl.h" \
 423     "sys/sysmacros.h" \
 424     "aio.h"
 425
 426 ifeq ($(THREAD_MODEL), single)
 427 # Remove headers not supported in single-threaded mode.
 428 MUSL_OMIT_HEADERS += "pthread.h"
 429 endif
 430
 431 default: finish
 432
 433 $(SYSROOT_LIB)/libc.a: $(LIBC_OBJS)
 434
 435 $(SYSROOT_LIB)/libc-printscan-long-double.a: $(MUSL_PRINTSCAN_LONG_DOUBLE_OBJS)
 436
 437 $(SYSROOT_LIB)/libc-printscan-no-floating-point.a: $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS)
 438
 439 $(SYSROOT_LIB)/libwasi-emulated-mman.a: $(LIBWASI_EMULATED_MMAN_OBJS)
 440
 441 $(SYSROOT_LIB)/libwasi-emulated-process-clocks.a: $(LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS)
 442
 443 $(SYSROOT_LIB)/libwasi-emulated-getpid.a: $(LIBWASI_EMULATED_GETPID_OBJS)
 444
 445 $(SYSROOT_LIB)/libwasi-emulated-signal.a: $(LIBWASI_EMULATED_SIGNAL_OBJS) $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS)
 446
 447 %.a:
 448         @mkdir -p "$(@D)"
 449         # On Windows, the commandline for the ar invocation got too long, so it needs to be split up.
 450         $(AR) crs $@ $(wordlist 1, 199, $^)
 451         $(AR) crs $@ $(wordlist 200, 399, $^)
 452         $(AR) crs $@ $(wordlist 400, 599, $^)
 453         $(AR) crs $@ $(wordlist 600, 799, $^)
 454         # This might eventually overflow again, but at least it'll do so in a loud way instead of
 455         # silently dropping the tail.
 456         $(AR) crs $@ $(wordlist 800, 100000, $^)
 457
 458 $(MUSL_PRINTSCAN_OBJS): CFLAGS += \
 459             -D__wasilibc_printscan_no_long_double \
 460             -D__wasilibc_printscan_full_support_option="\"add -lc-printscan-long-double to the link command\""
 461
 462 $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS): CFLAGS += \
 463             -D__wasilibc_printscan_no_floating_point \
 464             -D__wasilibc_printscan_floating_point_support_option="\"remove -lc-printscan-no-floating-point from the link command\""
 465
 466 # TODO: apply -mbulk-memory globally, once
 467 # https://github.com/llvm/llvm-project/issues/52618 is resolved
 468 $(BULK_MEMORY_OBJS): CFLAGS += \
 469         -mbulk-memory
 470
 471 $(BULK_MEMORY_OBJS): CFLAGS += \
 472         -DBULK_MEMORY_THRESHOLD=$(BULK_MEMORY_THRESHOLD)
 473
 474 $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS): CFLAGS += \
 475             -D_WASI_EMULATED_SIGNAL
 476
 477 $(OBJDIR)/%.long-double.o: $(CURDIR)/%.c include_dirs
 478         @mkdir -p "$(@D)"
 479         $(CC) $(CFLAGS) -MD -MP -o $@ -c $<
 480
 481 $(OBJDIR)/%.no-floating-point.o: $(CURDIR)/%.c include_dirs
 482         @mkdir -p "$(@D)"
 483         $(CC) $(CFLAGS) -MD -MP -o $@ -c $<
 484
 485 $(OBJDIR)/%.o: $(CURDIR)/%.c include_dirs
 486         @mkdir -p "$(@D)"
 487         $(CC) $(CFLAGS) -MD -MP -o $@ -c $<
 488
 489 -include $(shell find $(OBJDIR) -name \*.d)
 490
 491 $(DLMALLOC_OBJS): CFLAGS += \
 492     -I$(DLMALLOC_INC)
 493
 494 startup_files $(LIBC_BOTTOM_HALF_ALL_OBJS): CFLAGS += \
 495     -I$(LIBC_BOTTOM_HALF_HEADERS_PRIVATE) \
 496     -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_INC) \
 497     -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC) \
 498     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/include \
 499     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal
 500
 501 $(LIBC_TOP_HALF_ALL_OBJS) $(MUSL_PRINTSCAN_LONG_DOUBLE_OBJS) $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS) $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS): CFLAGS += \
 502     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/include \
 503     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal \
 504     -I$(LIBC_TOP_HALF_MUSL_DIR)/arch/wasm32 \
 505     -I$(LIBC_TOP_HALF_MUSL_DIR)/arch/generic \
 506     -I$(LIBC_TOP_HALF_HEADERS_PRIVATE) \
 507     -Wno-parentheses \
 508     -Wno-shift-op-parentheses \
 509     -Wno-bitwise-op-parentheses \
 510     -Wno-logical-op-parentheses \
 511     -Wno-string-plus-int \
 512     -Wno-dangling-else \
 513     -Wno-unknown-pragmas
 514
 515 $(LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS): CFLAGS += \
 516     -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)
 517
 518 include_dirs:
 519         #
 520         # Install the include files.
 521         #
 522         mkdir -p "$(SYSROOT_INC)"
 523         cp -r "$(LIBC_BOTTOM_HALF_HEADERS_PUBLIC)"/* "$(SYSROOT_INC)"
 524
 525         # Generate musl's bits/alltypes.h header.
 526         mkdir -p "$(SYSROOT_INC)/bits"
 527         sed -f $(LIBC_TOP_HALF_MUSL_DIR)/tools/mkalltypes.sed \
 528             $(LIBC_TOP_HALF_MUSL_DIR)/arch/wasm32/bits/alltypes.h.in \
 529             $(LIBC_TOP_HALF_MUSL_DIR)/include/alltypes.h.in \
 530             > "$(SYSROOT_INC)/bits/alltypes.h"
 531
 532         # Copy in the bulk of musl's public header files.
 533         cp -r "$(LIBC_TOP_HALF_MUSL_INC)"/* "$(SYSROOT_INC)"
 534         # Copy in the musl's "bits" header files.
 535         cp -r "$(LIBC_TOP_HALF_MUSL_DIR)"/arch/generic/bits/* "$(SYSROOT_INC)/bits"
 536         cp -r "$(LIBC_TOP_HALF_MUSL_DIR)"/arch/wasm32/bits/* "$(SYSROOT_INC)/bits"
 537
 538         # Remove selected header files.
 539         $(RM) $(patsubst %,$(SYSROOT_INC)/%,$(MUSL_OMIT_HEADERS))
 540
 541 startup_files: include_dirs
 542         #
 543         # Build the startup files.
 544         #
 545         @mkdir -p "$(OBJDIR)"
 546         cd "$(OBJDIR)" && \
 547         $(CC) $(CFLAGS) -c $(LIBC_BOTTOM_HALF_CRT_SOURCES) -MD -MP && \
 548         mkdir -p "$(SYSROOT_LIB)" && \
 549         mv *.o "$(SYSROOT_LIB)"
 550
 551 libc: include_dirs \
 552     $(SYSROOT_LIB)/libc.a \
 553     $(SYSROOT_LIB)/libc-printscan-long-double.a \
 554     $(SYSROOT_LIB)/libc-printscan-no-floating-point.a \
 555     $(SYSROOT_LIB)/libwasi-emulated-mman.a \
 556     $(SYSROOT_LIB)/libwasi-emulated-process-clocks.a \
 557     $(SYSROOT_LIB)/libwasi-emulated-getpid.a \
 558     $(SYSROOT_LIB)/libwasi-emulated-signal.a
 559
 560 finish: startup_files libc
 561         #
 562         # Create empty placeholder libraries.
 563         #
 564         for name in m rt pthread crypt util xnet resolv dl; do \
 565             $(AR) crs "$(SYSROOT_LIB)/lib$${name}.a"; \
 566         done
 567
 568         #
 569         # The build succeeded! The generated sysroot is in $(SYSROOT).
 570         #
 571
 572 # The check for defined and undefined symbols expects there to be a heap
 573 # alloctor (providing malloc, calloc, free, etc). Skip this step if the build
 574 # is done without a malloc implementation.
 575 ifneq ($(MALLOC_IMPL),none)
 576 finish: check-symbols
 577 endif
 578
 579 DEFINED_SYMBOLS = $(SYSROOT_SHARE)/defined-symbols.txt
 580 UNDEFINED_SYMBOLS = $(SYSROOT_SHARE)/undefined-symbols.txt
 581
 582 check-symbols: startup_files libc
 583         #
 584         # Collect metadata on the sysroot and perform sanity checks.
 585         #
 586         mkdir -p "$(SYSROOT_SHARE)"
 587
 588         #
 589         # Collect symbol information.
 590         #
 591         @# TODO: Use llvm-nm --extern-only instead of grep. This is blocked on
 592         @# LLVM PR40497, which is fixed in 9.0, but not in 8.0.
 593         @# Ignore certain llvm builtin symbols such as those starting with __mul
 594         @# since these dependencies can vary between llvm versions.
 595         "$(NM)" --defined-only "$(SYSROOT_LIB)"/libc.a "$(SYSROOT_LIB)"/libwasi-emulated-*.a "$(SYSROOT_LIB)"/*.o \
 596             |grep ' [[:upper:]] ' |sed 's/.* [[:upper:]] //' |LC_ALL=C sort |uniq > "$(DEFINED_SYMBOLS)"
 597         for undef_sym in $$("$(NM)" --undefined-only "$(SYSROOT_LIB)"/libc.a "$(SYSROOT_LIB)"/libc-*.a "$(SYSROOT_LIB)"/*.o \
 598             |grep ' U ' |sed 's/.* U //' |LC_ALL=C sort |uniq); do \
 599             grep -q '\<'$$undef_sym'\>' "$(DEFINED_SYMBOLS)" || echo $$undef_sym; \
 600         done | grep -v "^__mul" > "$(UNDEFINED_SYMBOLS)"
 601         grep '^_*imported_wasi_' "$(UNDEFINED_SYMBOLS)" \
 602             > "$(SYSROOT_LIB)/libc.imports"
 603
 604         #
 605         # Generate a test file that includes all public C header files.
 606         #
 607         cd "$(SYSROOT_INC)" && \
 608           for header in $$(find . -type f -not -name mman.h -not -name signal.h -not -name times.h -not -name resource.h |grep -v /bits/ |grep -v /c++/); do \
 609               echo '#include <'$$header'>' | sed 's/\.\///' ; \
 610         done |LC_ALL=C sort >$(SYSROOT_SHARE)/include-all.c ; \
 611         cd - >/dev/null
 612
 613         #
 614         # Test that it compiles.
 615         #
 616         $(CC) $(CFLAGS) -fsyntax-only "$(SYSROOT_SHARE)/include-all.c" -Wno-\#warnings
 617
 618         #
 619         # Collect all the predefined macros, except for compiler version macros
 620         # which we don't need to track here.
 621         #
 622         @#
 623         @# For the __*_ATOMIC_*_LOCK_FREE macros, squash individual compiler names
 624         @# to attempt, toward keeping these files compiler-independent.
 625         @#
 626         @# We have to add `-isystem $(SYSROOT_INC)` because otherwise clang puts
 627         @# its builtin include path first, which produces compiler-specific
 628         @# output.
 629         @#
 630         @# TODO: Undefine __FLOAT128__ for now since it's not in clang 8.0.
 631         @# TODO: Filter out __FLT16_* for now, as not all versions of clang have these.
 632         @# TODO: Filter out __NO_MATH_ERRNO_ and a few __*WIDTH__ that are new to clang 14.
 633         @# TODO: clang defined __FLT_EVAL_METHOD__ until clang 15, so we force-undefine it
 634         @# for older versions.
 635         $(CC) $(CFLAGS) "$(SYSROOT_SHARE)/include-all.c" \
 636             -isystem $(SYSROOT_INC) \
 637             -std=gnu17 \
 638             -E -dM -Wno-\#warnings \
 639             -D_ALL_SOURCE \
 640             -U__llvm__ \
 641             -U__clang__ \
 642             -U__clang_major__ \
 643             -U__clang_minor__ \
 644             -U__clang_patchlevel__ \
 645             -U__clang_version__ \
 646             -U__clang_literal_encoding__ \
 647             -U__clang_wide_literal_encoding__ \
 648             -U__GNUC__ \
 649             -U__GNUC_MINOR__ \
 650             -U__GNUC_PATCHLEVEL__ \
 651             -U__VERSION__ \
 652             -U__FLOAT128__ \
 653             -U__NO_MATH_ERRNO__ \
 654             -U__BITINT_MAXWIDTH__ \
 655             -U__FLT_EVAL_METHOD__ -Wno-builtin-macro-redefined \
 656             | sed -e 's/__[[:upper:][:digit:]]*_ATOMIC_\([[:upper:][:digit:]_]*\)_LOCK_FREE/__compiler_ATOMIC_\1_LOCK_FREE/' \
 657             | grep -v '^#define __FLT16_' \
 658             | grep -v '^#define __\(BOOL\|INT_\(LEAST\|FAST\)\(8\|16\|32\|64\)\|INT\|LONG\|LLONG\|SHRT\)_WIDTH__' \
 659             > "$(SYSROOT_SHARE)/predefined-macros.txt"
 660
 661         # Check that the computed metadata matches the expected metadata.
 662         # This ignores whitespace because on Windows the output has CRLF line endings.
 663         diff -wur "$(CURDIR)/expected/$(MULTIARCH_TRIPLE)/$(THREAD_MODEL)" "$(SYSROOT_SHARE)"
 664
 665 install: finish
 666         mkdir -p "$(INSTALL_DIR)"
 667         cp -r "$(SYSROOT)/lib" "$(SYSROOT)/share" "$(SYSROOT)/include" "$(INSTALL_DIR)"
 668
 669 clean:
 670         $(RM) -r "$(OBJDIR)"
 671         $(RM) -r "$(SYSROOT)"
 672
 673 .PHONY: default startup_files libc finish install include_dirs clean