Makefile

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