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