Makefile

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