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