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