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/__wait.c \
 194         thread/__timedwait.c \
 195         thread/pthread_mutex_consistent.c \
 196         thread/pthread_mutex_destroy.c \
 197         thread/pthread_mutex_init.c \
 198         thread/pthread_mutex_getprioceiling.c \
 199         thread/pthread_mutex_lock.c \
 200         thread/pthread_mutex_timedlock.c \
 201         thread/pthread_mutex_trylock.c \
 202         thread/pthread_mutex_unlock.c \
 203         thread/pthread_mutexattr_destroy.c \
 204         thread/pthread_mutexattr_init.c \
 205         thread/pthread_mutexattr_setprotocol.c \
 206         thread/pthread_mutexattr_setpshared.c \
 207         thread/pthread_mutexattr_setrobust.c \
 208         thread/pthread_mutexattr_settype.c \
 209         thread/pthread_setcancelstate.c \
 210     )
 211 endif
 212
 213 MUSL_PRINTSCAN_SOURCES = \
 214     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal/floatscan.c \
 215     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/vfprintf.c \
 216     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/vfwprintf.c \
 217     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/vfscanf.c \
 218     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdlib/strtod.c \
 219     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdlib/wcstod.c
 220 BULK_MEMORY_SOURCES = \
 221     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memcpy.c \
 222     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memmove.c \
 223     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memset.c
 224 LIBC_TOP_HALF_HEADERS_PRIVATE = $(LIBC_TOP_HALF_DIR)/headers/private
 225 LIBC_TOP_HALF_SOURCES = $(LIBC_TOP_HALF_DIR)/sources
 226 LIBC_TOP_HALF_ALL_SOURCES = \
 227     $(LIBC_TOP_HALF_MUSL_SOURCES) \
 228     $(sort $(shell find $(LIBC_TOP_HALF_SOURCES) -name \*.c))
 229
 230 # Add any extra flags
 231 CFLAGS = $(EXTRA_CFLAGS)
 232 # Set the target.
 233 CFLAGS += --target=$(TARGET_TRIPLE)
 234 # WebAssembly floating-point match doesn't trap.
 235 # TODO: Add -fno-signaling-nans when the compiler supports it.
 236 CFLAGS += -fno-trapping-math
 237 # Add all warnings, but disable a few which occur in third-party code.
 238 CFLAGS += -Wall -Wextra -Werror \
 239   -Wno-null-pointer-arithmetic \
 240   -Wno-unused-parameter \
 241   -Wno-sign-compare \
 242   -Wno-unused-variable \
 243   -Wno-unused-function \
 244   -Wno-ignored-attributes \
 245   -Wno-missing-braces \
 246   -Wno-ignored-pragmas \
 247   -Wno-unused-but-set-variable \
 248   -Wno-unknown-warning-option
 249
 250 # Configure support for threads.
 251 ifeq ($(THREAD_MODEL), single)
 252 CFLAGS += -mthread-model single
 253 endif
 254 ifeq ($(THREAD_MODEL), posix)
 255 # Specify the tls-model until LLVM 15 is released (which should contain
 256 # https://reviews.llvm.org/D130053).
 257 CFLAGS += -mthread-model posix -pthread -ftls-model=local-exec
 258 endif
 259
 260 # Expose the public headers to the implementation. We use `-isystem` for
 261 # purpose for two reasons:
 262 #
 263 # 1. It only does `<...>` not `"...."` lookup. We are making a libc,
 264 #    which is a system library, so all public headers should be
 265 #    accessible via `<...>` and never also need `"..."`. `-isystem` main
 266 #    purpose is to only effect `<...>` lookup.
 267 #
 268 # 2. The `-I` for private headers added for specific C files below
 269 #    should come earlier in the search path, so they can "override"
 270 #    and/or `#include_next` the public headers. `-isystem` (like
 271 #    `-idirafter`) comes later in the search path than `-I`.
 272 CFLAGS += -isystem "$(SYSROOT_INC)"
 273
 274 # These variables describe the locations of various files and directories in
 275 # the build tree.
 276 objs = $(patsubst $(CURDIR)/%.c,$(OBJDIR)/%.o,$(1))
 277 DLMALLOC_OBJS = $(call objs,$(DLMALLOC_SOURCES))
 278 LIBC_BOTTOM_HALF_ALL_OBJS = $(call objs,$(LIBC_BOTTOM_HALF_ALL_SOURCES))
 279 LIBC_TOP_HALF_ALL_OBJS = $(call objs,$(LIBC_TOP_HALF_ALL_SOURCES))
 280 ifeq ($(MALLOC_IMPL),dlmalloc)
 281 LIBC_OBJS += $(DLMALLOC_OBJS)
 282 else ifeq ($(MALLOC_IMPL),none)
 283 # No object files to add.
 284 else
 285 $(error unknown malloc implementation $(MALLOC_IMPL))
 286 endif
 287 # Add libc-bottom-half's objects.
 288 LIBC_OBJS += $(LIBC_BOTTOM_HALF_ALL_OBJS)
 289 ifeq ($(BUILD_LIBC_TOP_HALF),yes)
 290 # libc-top-half is musl.
 291 LIBC_OBJS += $(LIBC_TOP_HALF_ALL_OBJS)
 292 endif
 293 MUSL_PRINTSCAN_OBJS = $(call objs,$(MUSL_PRINTSCAN_SOURCES))
 294 MUSL_PRINTSCAN_LONG_DOUBLE_OBJS = $(patsubst %.o,%.long-double.o,$(MUSL_PRINTSCAN_OBJS))
 295 MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS = $(patsubst %.o,%.no-floating-point.o,$(MUSL_PRINTSCAN_OBJS))
 296 BULK_MEMORY_OBJS = $(call objs,$(BULK_MEMORY_SOURCES))
 297 LIBWASI_EMULATED_MMAN_OBJS = $(call objs,$(LIBWASI_EMULATED_MMAN_SOURCES))
 298 LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS = $(call objs,$(LIBWASI_EMULATED_PROCESS_CLOCKS_SOURCES))
 299 LIBWASI_EMULATED_GETPID_OBJS = $(call objs,$(LIBWASI_EMULATED_GETPID_SOURCES))
 300 LIBWASI_EMULATED_SIGNAL_OBJS = $(call objs,$(LIBWASI_EMULATED_SIGNAL_SOURCES))
 301 LIBWASI_EMULATED_SIGNAL_MUSL_OBJS = $(call objs,$(LIBWASI_EMULATED_SIGNAL_MUSL_SOURCES))
 302
 303 # These variables describe the locations of various files and
 304 # directories in the generated sysroot tree.
 305 SYSROOT_LIB := $(SYSROOT)/lib/$(MULTIARCH_TRIPLE)
 306 SYSROOT_INC = $(SYSROOT)/include
 307 SYSROOT_SHARE = $(SYSROOT)/share/$(MULTIARCH_TRIPLE)
 308
 309 # Files from musl's include directory that we don't want to install in the
 310 # sysroot's include directory.
 311 MUSL_OMIT_HEADERS :=
 312
 313 # Remove files which aren't headers (we generate alltypes.h below).
 314 MUSL_OMIT_HEADERS += \
 315     "bits/syscall.h.in" \
 316     "bits/alltypes.h.in" \
 317     "alltypes.h.in"
 318
 319 # Use the compiler's version of these headers.
 320 MUSL_OMIT_HEADERS += \
 321     "stdarg.h" \
 322     "stddef.h"
 323
 324 # Use the WASI errno definitions.
 325 MUSL_OMIT_HEADERS += \
 326     "bits/errno.h"
 327
 328 # Remove headers that aren't supported yet or that aren't relevant for WASI.
 329 MUSL_OMIT_HEADERS += \
 330     "sys/procfs.h" \
 331     "sys/user.h" \
 332     "sys/kd.h" "sys/vt.h" "sys/soundcard.h" "sys/sem.h" \
 333     "sys/shm.h" "sys/msg.h" "sys/ipc.h" "sys/ptrace.h" \
 334     "sys/statfs.h" \
 335     "bits/kd.h" "bits/vt.h" "bits/soundcard.h" "bits/sem.h" \
 336     "bits/shm.h" "bits/msg.h" "bits/ipc.h" "bits/ptrace.h" \
 337     "bits/statfs.h" \
 338     "sys/vfs.h" \
 339     "sys/statvfs.h" \
 340     "syslog.h" "sys/syslog.h" \
 341     "wait.h" "sys/wait.h" \
 342     "ucontext.h" "sys/ucontext.h" \
 343     "paths.h" \
 344     "utmp.h" "utmpx.h" \
 345     "lastlog.h" \
 346     "sys/acct.h" \
 347     "sys/cachectl.h" \
 348     "sys/epoll.h" "sys/reboot.h" "sys/swap.h" \
 349     "sys/sendfile.h" "sys/inotify.h" \
 350     "sys/quota.h" \
 351     "sys/klog.h" \
 352     "sys/fsuid.h" \
 353     "sys/io.h" \
 354     "sys/prctl.h" \
 355     "sys/mtio.h" \
 356     "sys/mount.h" \
 357     "sys/fanotify.h" \
 358     "sys/personality.h" \
 359     "elf.h" "link.h" "bits/link.h" \
 360     "scsi/scsi.h" "scsi/scsi_ioctl.h" "scsi/sg.h" \
 361     "sys/auxv.h" \
 362     "pwd.h" "shadow.h" "grp.h" \
 363     "mntent.h" \
 364     "netdb.h" \
 365     "resolv.h" \
 366     "pty.h" \
 367     "dlfcn.h" \
 368     "setjmp.h" \
 369     "ulimit.h" \
 370     "sys/xattr.h" \
 371     "wordexp.h" \
 372     "spawn.h" \
 373     "sys/membarrier.h" \
 374     "sys/signalfd.h" \
 375     "termios.h" \
 376     "sys/termios.h" \
 377     "bits/termios.h" \
 378     "net/if.h" \
 379     "net/if_arp.h" \
 380     "net/ethernet.h" \
 381     "net/route.h" \
 382     "netinet/if_ether.h" \
 383     "netinet/ether.h" \
 384     "sys/timerfd.h" \
 385     "libintl.h" \
 386     "sys/sysmacros.h" \
 387     "aio.h"
 388
 389 ifeq ($(THREAD_MODEL), single)
 390 # Remove headers not supported in single-threaded mode.
 391 MUSL_OMIT_HEADERS += "pthread.h"
 392 endif
 393
 394 default: finish
 395
 396 $(SYSROOT_LIB)/libc.a: $(LIBC_OBJS)
 397
 398 $(SYSROOT_LIB)/libc-printscan-long-double.a: $(MUSL_PRINTSCAN_LONG_DOUBLE_OBJS)
 399
 400 $(SYSROOT_LIB)/libc-printscan-no-floating-point.a: $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS)
 401
 402 $(SYSROOT_LIB)/libwasi-emulated-mman.a: $(LIBWASI_EMULATED_MMAN_OBJS)
 403
 404 $(SYSROOT_LIB)/libwasi-emulated-process-clocks.a: $(LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS)
 405
 406 $(SYSROOT_LIB)/libwasi-emulated-getpid.a: $(LIBWASI_EMULATED_GETPID_OBJS)
 407
 408 $(SYSROOT_LIB)/libwasi-emulated-signal.a: $(LIBWASI_EMULATED_SIGNAL_OBJS) $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS)
 409
 410 %.a:
 411         @mkdir -p "$(@D)"
 412         # On Windows, the commandline for the ar invocation got too long, so it needs to be split up.
 413         $(AR) crs $@ $(wordlist 1, 199, $^)
 414         $(AR) crs $@ $(wordlist 200, 399, $^)
 415         $(AR) crs $@ $(wordlist 400, 599, $^)
 416         $(AR) crs $@ $(wordlist 600, 799, $^)
 417         # This might eventually overflow again, but at least it'll do so in a loud way instead of
 418         # silently dropping the tail.
 419         $(AR) crs $@ $(wordlist 800, 100000, $^)
 420
 421 $(MUSL_PRINTSCAN_OBJS): CFLAGS += \
 422             -D__wasilibc_printscan_no_long_double \
 423             -D__wasilibc_printscan_full_support_option="\"add -lc-printscan-long-double to the link command\""
 424
 425 $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS): CFLAGS += \
 426             -D__wasilibc_printscan_no_floating_point \
 427             -D__wasilibc_printscan_floating_point_support_option="\"remove -lc-printscan-no-floating-point from the link command\""
 428
 429 # TODO: apply -mbulk-memory globally, once
 430 # https://github.com/llvm/llvm-project/issues/52618 is resolved
 431 $(BULK_MEMORY_OBJS): CFLAGS += \
 432         -mbulk-memory
 433
 434 $(BULK_MEMORY_OBJS): CFLAGS += \
 435         -DBULK_MEMORY_THRESHOLD=$(BULK_MEMORY_THRESHOLD)
 436
 437 $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS): CFLAGS += \
 438             -D_WASI_EMULATED_SIGNAL
 439
 440 $(OBJDIR)/%.long-double.o: $(CURDIR)/%.c include_dirs
 441         @mkdir -p "$(@D)"
 442         $(CC) $(CFLAGS) -MD -MP -o $@ -c $<
 443
 444 $(OBJDIR)/%.no-floating-point.o: $(CURDIR)/%.c include_dirs
 445         @mkdir -p "$(@D)"
 446         $(CC) $(CFLAGS) -MD -MP -o $@ -c $<
 447
 448 $(OBJDIR)/%.o: $(CURDIR)/%.c include_dirs
 449         @mkdir -p "$(@D)"
 450         $(CC) $(CFLAGS) -MD -MP -o $@ -c $<
 451
 452 -include $(shell find $(OBJDIR) -name \*.d)
 453
 454 $(DLMALLOC_OBJS): CFLAGS += \
 455     -I$(DLMALLOC_INC)
 456
 457 startup_files $(LIBC_BOTTOM_HALF_ALL_OBJS): CFLAGS += \
 458     -I$(LIBC_BOTTOM_HALF_HEADERS_PRIVATE) \
 459     -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_INC) \
 460     -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC) \
 461     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/include \
 462     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal
 463
 464 $(LIBC_TOP_HALF_ALL_OBJS) $(MUSL_PRINTSCAN_LONG_DOUBLE_OBJS) $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS) $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS): CFLAGS += \
 465     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/include \
 466     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal \
 467     -I$(LIBC_TOP_HALF_MUSL_DIR)/arch/wasm32 \
 468     -I$(LIBC_TOP_HALF_MUSL_DIR)/arch/generic \
 469     -I$(LIBC_TOP_HALF_HEADERS_PRIVATE) \
 470     -Wno-parentheses \
 471     -Wno-shift-op-parentheses \
 472     -Wno-bitwise-op-parentheses \
 473     -Wno-logical-op-parentheses \
 474     -Wno-string-plus-int \
 475     -Wno-dangling-else \
 476     -Wno-unknown-pragmas
 477
 478 $(LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS): CFLAGS += \
 479     -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)
 480
 481 include_dirs:
 482         #
 483         # Install the include files.
 484         #
 485         mkdir -p "$(SYSROOT_INC)"
 486         cp -r "$(LIBC_BOTTOM_HALF_HEADERS_PUBLIC)"/* "$(SYSROOT_INC)"
 487
 488         # Generate musl's bits/alltypes.h header.
 489         mkdir -p "$(SYSROOT_INC)/bits"
 490         sed -f $(LIBC_TOP_HALF_MUSL_DIR)/tools/mkalltypes.sed \
 491             $(LIBC_TOP_HALF_MUSL_DIR)/arch/wasm32/bits/alltypes.h.in \
 492             $(LIBC_TOP_HALF_MUSL_DIR)/include/alltypes.h.in \
 493             > "$(SYSROOT_INC)/bits/alltypes.h"
 494
 495         # Copy in the bulk of musl's public header files.
 496         cp -r "$(LIBC_TOP_HALF_MUSL_INC)"/* "$(SYSROOT_INC)"
 497         # Copy in the musl's "bits" header files.
 498         cp -r "$(LIBC_TOP_HALF_MUSL_DIR)"/arch/generic/bits/* "$(SYSROOT_INC)/bits"
 499         cp -r "$(LIBC_TOP_HALF_MUSL_DIR)"/arch/wasm32/bits/* "$(SYSROOT_INC)/bits"
 500
 501         # Remove selected header files.
 502         $(RM) $(patsubst %,$(SYSROOT_INC)/%,$(MUSL_OMIT_HEADERS))
 503
 504 startup_files: include_dirs
 505         #
 506         # Build the startup files.
 507         #
 508         @mkdir -p "$(OBJDIR)"
 509         cd "$(OBJDIR)" && \
 510         $(CC) $(CFLAGS) -c $(LIBC_BOTTOM_HALF_CRT_SOURCES) -MD -MP && \
 511         mkdir -p "$(SYSROOT_LIB)" && \
 512         mv *.o "$(SYSROOT_LIB)"
 513
 514 libc: include_dirs \
 515     $(SYSROOT_LIB)/libc.a \
 516     $(SYSROOT_LIB)/libc-printscan-long-double.a \
 517     $(SYSROOT_LIB)/libc-printscan-no-floating-point.a \
 518     $(SYSROOT_LIB)/libwasi-emulated-mman.a \
 519     $(SYSROOT_LIB)/libwasi-emulated-process-clocks.a \
 520     $(SYSROOT_LIB)/libwasi-emulated-getpid.a \
 521     $(SYSROOT_LIB)/libwasi-emulated-signal.a
 522
 523 finish: startup_files libc
 524         #
 525         # Create empty placeholder libraries.
 526         #
 527         for name in m rt pthread crypt util xnet resolv dl; do \
 528             $(AR) crs "$(SYSROOT_LIB)/lib$${name}.a"; \
 529         done
 530
 531         #
 532         # The build succeeded! The generated sysroot is in $(SYSROOT).
 533         #
 534
 535 # The check for defined and undefined symbols expects there to be a heap
 536 # alloctor (providing malloc, calloc, free, etc). Skip this step if the build
 537 # is done without a malloc implementation.
 538 ifneq ($(MALLOC_IMPL),none)
 539 finish: check-symbols
 540 endif
 541
 542 DEFINED_SYMBOLS = $(SYSROOT_SHARE)/defined-symbols.txt
 543 UNDEFINED_SYMBOLS = $(SYSROOT_SHARE)/undefined-symbols.txt
 544
 545 check-symbols: startup_files libc
 546         #
 547         # Collect metadata on the sysroot and perform sanity checks.
 548         #
 549         mkdir -p "$(SYSROOT_SHARE)"
 550
 551         #
 552         # Collect symbol information.
 553         #
 554         @# TODO: Use llvm-nm --extern-only instead of grep. This is blocked on
 555         @# LLVM PR40497, which is fixed in 9.0, but not in 8.0.
 556         @# Ignore certain llvm builtin symbols such as those starting with __mul
 557         @# since these dependencies can vary between llvm versions.
 558         "$(NM)" --defined-only "$(SYSROOT_LIB)"/libc.a "$(SYSROOT_LIB)"/libwasi-emulated-*.a "$(SYSROOT_LIB)"/*.o \
 559             |grep ' [[:upper:]] ' |sed 's/.* [[:upper:]] //' |LC_ALL=C sort |uniq > "$(DEFINED_SYMBOLS)"
 560         for undef_sym in $$("$(NM)" --undefined-only "$(SYSROOT_LIB)"/libc.a "$(SYSROOT_LIB)"/libc-*.a "$(SYSROOT_LIB)"/*.o \
 561             |grep ' U ' |sed 's/.* U //' |LC_ALL=C sort |uniq); do \
 562             grep -q '\<'$$undef_sym'\>' "$(DEFINED_SYMBOLS)" || echo $$undef_sym; \
 563         done | grep -v "^__mul" > "$(UNDEFINED_SYMBOLS)"
 564         grep '^_*imported_wasi_' "$(UNDEFINED_SYMBOLS)" \
 565             > "$(SYSROOT_LIB)/libc.imports"
 566
 567         #
 568         # Generate a test file that includes all public C header files.
 569         #
 570         cd "$(SYSROOT_INC)" && \
 571           for header in $$(find . -type f -not -name mman.h -not -name signal.h -not -name times.h -not -name resource.h |grep -v /bits/ |grep -v /c++/); do \
 572               echo '#include <'$$header'>' | sed 's/\.\///' ; \
 573         done |LC_ALL=C sort >$(SYSROOT_SHARE)/include-all.c ; \
 574         cd - >/dev/null
 575
 576         #
 577         # Test that it compiles.
 578         #
 579         $(CC) $(CFLAGS) -fsyntax-only "$(SYSROOT_SHARE)/include-all.c" -Wno-\#warnings
 580
 581         #
 582         # Collect all the predefined macros, except for compiler version macros
 583         # which we don't need to track here.
 584         #
 585         @#
 586         @# For the __*_ATOMIC_*_LOCK_FREE macros, squash individual compiler names
 587         @# to attempt, toward keeping these files compiler-independent.
 588         @#
 589         @# We have to add `-isystem $(SYSROOT_INC)` because otherwise clang puts
 590         @# its builtin include path first, which produces compiler-specific
 591         @# output.
 592         @#
 593         @# TODO: Undefine __FLOAT128__ for now since it's not in clang 8.0.
 594         @# TODO: Filter out __FLT16_* for now, as not all versions of clang have these.
 595         @# TODO: Filter out __NO_MATH_ERRNO_ and a few __*WIDTH__ that are new to clang 14.
 596         @# TODO: clang defined __FLT_EVAL_METHOD__ until clang 15, so we force-undefine it
 597         @# for older versions.
 598         $(CC) $(CFLAGS) "$(SYSROOT_SHARE)/include-all.c" \
 599             -isystem $(SYSROOT_INC) \
 600             -std=gnu17 \
 601             -E -dM -Wno-\#warnings \
 602             -D_ALL_SOURCE \
 603             -U__llvm__ \
 604             -U__clang__ \
 605             -U__clang_major__ \
 606             -U__clang_minor__ \
 607             -U__clang_patchlevel__ \
 608             -U__clang_version__ \
 609             -U__clang_literal_encoding__ \
 610             -U__clang_wide_literal_encoding__ \
 611             -U__GNUC__ \
 612             -U__GNUC_MINOR__ \
 613             -U__GNUC_PATCHLEVEL__ \
 614             -U__VERSION__ \
 615             -U__FLOAT128__ \
 616             -U__NO_MATH_ERRNO__ \
 617             -U__BITINT_MAXWIDTH__ \
 618             -U__FLT_EVAL_METHOD__ -Wno-builtin-macro-redefined \
 619             | sed -e 's/__[[:upper:][:digit:]]*_ATOMIC_\([[:upper:][:digit:]_]*\)_LOCK_FREE/__compiler_ATOMIC_\1_LOCK_FREE/' \
 620             | grep -v '^#define __FLT16_' \
 621             | grep -v '^#define __\(BOOL\|INT_\(LEAST\|FAST\)\(8\|16\|32\|64\)\|INT\|LONG\|LLONG\|SHRT\)_WIDTH__' \
 622             > "$(SYSROOT_SHARE)/predefined-macros.txt"
 623
 624         # Check that the computed metadata matches the expected metadata.
 625         # This ignores whitespace because on Windows the output has CRLF line endings.
 626         diff -wur "$(CURDIR)/expected/$(MULTIARCH_TRIPLE)/$(THREAD_MODEL)" "$(SYSROOT_SHARE)"
 627
 628 install: finish
 629         mkdir -p "$(INSTALL_DIR)"
 630         cp -r "$(SYSROOT)/lib" "$(SYSROOT)/share" "$(SYSROOT)/include" "$(INSTALL_DIR)"
 631
 632 clean:
 633         $(RM) -r "$(OBJDIR)"
 634         $(RM) -r "$(SYSROOT)"
 635
 636 .PHONY: default startup_files libc finish install include_dirs clean