1 # These variables are specifically meant to be overridable via the make
3 # ?= doesn't work for CC and AR because make has a default value for them.
4 ifeq ($(origin CC
), default
)
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
)))
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; note that pthread support is still a work-in-progress.
17 THREAD_MODEL ?
= single
19 MALLOC_IMPL ?
= dlmalloc
21 BUILD_LIBC_TOP_HALF ?
= yes
22 # The directory where we're store intermediate artifacts.
23 OBJDIR ?
= $(CURDIR
)/build
25 # When the length is no larger than this threshold, we consider the
26 # overhead of bulk memory opcodes to outweigh the performance benefit,
27 # and fall back to the original musl implementation. See
28 # https://github.com/WebAssembly/wasi-libc/pull/263 for relevant
30 BULK_MEMORY_THRESHOLD ?
= 32
32 # Variables from this point on are not meant to be overridable via the
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
40 # These variables describe the locations of various files and directories in
42 DLMALLOC_DIR
= $(CURDIR
)/dlmalloc
43 DLMALLOC_SRC_DIR
= $(DLMALLOC_DIR
)/src
44 DLMALLOC_SOURCES
= $(DLMALLOC_SRC_DIR
)/dlmalloc.c
45 DLMALLOC_INC
= $(DLMALLOC_DIR
)/include
46 LIBC_BOTTOM_HALF_DIR
= $(CURDIR
)/libc-bottom-half
47 LIBC_BOTTOM_HALF_CLOUDLIBC_SRC
= $(LIBC_BOTTOM_HALF_DIR
)/cloudlibc
/src
48 LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_INC
= $(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC
)/include
49 LIBC_BOTTOM_HALF_HEADERS_PUBLIC
= $(LIBC_BOTTOM_HALF_DIR
)/headers
/public
50 LIBC_BOTTOM_HALF_HEADERS_PRIVATE
= $(LIBC_BOTTOM_HALF_DIR
)/headers
/private
51 LIBC_BOTTOM_HALF_SOURCES
= $(LIBC_BOTTOM_HALF_DIR
)/sources
52 LIBC_BOTTOM_HALF_ALL_SOURCES
= \
54 $(shell find
$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC
) -name \
*.c
) \
55 $(shell find
$(LIBC_BOTTOM_HALF_SOURCES
) -name \
*.c
))
57 # FIXME(https://reviews.llvm.org/D85567) - due to a bug in LLD the weak
58 # references to a function defined in `chdir.c` only work if `chdir.c` is at the
59 # end of the archive, but once that LLD review lands and propagates into LLVM
60 # then we don't have to do this.
61 LIBC_BOTTOM_HALF_ALL_SOURCES
:= $(filter-out $(LIBC_BOTTOM_HALF_SOURCES
)/chdir.c
,$(LIBC_BOTTOM_HALF_ALL_SOURCES
))
62 LIBC_BOTTOM_HALF_ALL_SOURCES
:= $(LIBC_BOTTOM_HALF_ALL_SOURCES
) $(LIBC_BOTTOM_HALF_SOURCES
)/chdir.c
64 LIBWASI_EMULATED_MMAN_SOURCES
= \
65 $(sort $(shell find
$(LIBC_BOTTOM_HALF_DIR
)/mman
-name \
*.c
))
66 LIBWASI_EMULATED_PROCESS_CLOCKS_SOURCES
= \
67 $(sort $(shell find
$(LIBC_BOTTOM_HALF_DIR
)/clocks
-name \
*.c
))
68 LIBWASI_EMULATED_GETPID_SOURCES
= \
69 $(sort $(shell find
$(LIBC_BOTTOM_HALF_DIR
)/getpid
-name \
*.c
))
70 LIBWASI_EMULATED_SIGNAL_SOURCES
= \
71 $(sort $(shell find
$(LIBC_BOTTOM_HALF_DIR
)/signal
-name \
*.c
))
72 LIBWASI_EMULATED_SIGNAL_MUSL_SOURCES
= \
73 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/signal
/psignal.c \
74 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/string
/strsignal.c
75 LIBC_BOTTOM_HALF_CRT_SOURCES
= $(wildcard $(LIBC_BOTTOM_HALF_DIR
)/crt
/*.c
)
76 LIBC_TOP_HALF_DIR
= $(CURDIR
)/libc-top-half
77 LIBC_TOP_HALF_MUSL_DIR
= $(LIBC_TOP_HALF_DIR
)/musl
78 LIBC_TOP_HALF_MUSL_SRC_DIR
= $(LIBC_TOP_HALF_MUSL_DIR
)/src
79 LIBC_TOP_HALF_MUSL_INC
= $(LIBC_TOP_HALF_MUSL_DIR
)/include
80 LIBC_TOP_HALF_MUSL_SOURCES
= \
81 $(addprefix $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/, \
89 misc
/getdomainname.c \
101 network
/inet_ntop.c \
102 network
/inet_pton.c \
103 network
/inet_aton.c \
104 network
/in6addr_any.c \
105 network
/in6addr_loopback.c \
109 fenv
/fesetexceptflag.c \
110 fenv
/fegetexceptflag.c \
111 fenv
/feholdexcept.c \
116 exit
/at_quick_exit.c \
129 time
/timespec_get.c \
134 time
/__tm_to_secs.c \
135 time
/__month_to_secs.c \
136 time
/__secs_to_tm.c \
137 time
/__year_to_secs.c \
141 dirent
/versionsort.c \
147 unistd
/posix_close.c \
149 legacy
/getpagesize.c \
150 thread
/thrd_sleep.c \
152 $(filter-out %/procfdname.c
%/syscall.c
%/syscall_ret.c
%/vdso.c
%/version.c
, \
153 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/internal
/*.c
)) \
154 $(filter-out %/flockfile.c
%/funlockfile.c
%/__lockfile.c
%/ftrylockfile.c \
156 %/tmpnam.c
%/tmpfile.c
%/tempnam.c \
157 %/popen.c
%/pclose.c \
160 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/stdio
/*.c
)) \
161 $(filter-out %/strsignal.c
, \
162 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/string
/*.c
)) \
163 $(filter-out %/dcngettext.c
%/textdomain.c
%/bind_textdomain_codeset.c
, \
164 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/locale
/*.c
)) \
165 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/stdlib
/*.c
) \
166 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/search
/*.c
) \
167 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/multibyte
/*.c
) \
168 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/regex
/*.c
) \
169 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/prng
/*.c
) \
170 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/conf
/*.c
) \
171 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/ctype
/*.c
) \
172 $(filter-out %/__signbit.c
%/__signbitf.c
%/__signbitl.c \
173 %/__fpclassify.c
%/__fpclassifyf.c
%/__fpclassifyl.c \
175 %/floorf.c
%/floor.c \
176 %/truncf.c
%/trunc.c \
178 %/nearbyintf.c
%/nearbyint.c \
181 %/copysignf.c
%/copysign.c \
182 %/fminf.c
%/fmaxf.c \
184 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/math
/*.c
)) \
185 $(filter-out %/crealf.c
%/creal.c
%creall.c \
186 %/cimagf.c
%/cimag.c
%cimagl.c
, \
187 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/complex
/*.c
)) \
188 $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/crypt
/*.c
)
190 ifeq ($(THREAD_MODEL
), posix
)
191 LIBC_TOP_HALF_MUSL_SOURCES
+= \
192 $(addprefix $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/, \
194 thread
/__timedwait.c \
195 thread
/pthread_mutex_consistent.c \
196 thread
/pthread_mutex_destroy.c \
197 thread
/pthread_mutex_init.c \
198 thread
/pthread_mutex_getprioceiling.c \
199 thread
/pthread_mutex_lock.c \
200 thread
/pthread_mutex_timedlock.c \
201 thread
/pthread_mutex_trylock.c \
202 thread
/pthread_mutex_unlock.c \
203 thread
/pthread_mutexattr_destroy.c \
204 thread
/pthread_mutexattr_init.c \
205 thread
/pthread_mutexattr_setprotocol.c \
206 thread
/pthread_mutexattr_setpshared.c \
207 thread
/pthread_mutexattr_setrobust.c \
208 thread
/pthread_mutexattr_settype.c \
209 thread
/pthread_setcancelstate.c \
213 MUSL_PRINTSCAN_SOURCES
= \
214 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/internal
/floatscan.c \
215 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/stdio
/vfprintf.c \
216 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/stdio
/vfwprintf.c \
217 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/stdio
/vfscanf.c \
218 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/stdlib
/strtod.c \
219 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/stdlib
/wcstod.c
220 BULK_MEMORY_SOURCES
= \
221 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/string
/memcpy.c \
222 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/string
/memmove.c \
223 $(LIBC_TOP_HALF_MUSL_SRC_DIR
)/string
/memset.c
224 LIBC_TOP_HALF_HEADERS_PRIVATE
= $(LIBC_TOP_HALF_DIR
)/headers
/private
225 LIBC_TOP_HALF_SOURCES
= $(LIBC_TOP_HALF_DIR
)/sources
226 LIBC_TOP_HALF_ALL_SOURCES
= \
227 $(LIBC_TOP_HALF_MUSL_SOURCES
) \
228 $(sort $(shell find
$(LIBC_TOP_HALF_SOURCES
) -name \
*.c
))
230 # Add any extra flags
231 CFLAGS
= $(EXTRA_CFLAGS
)
233 CFLAGS
+= --target
=$(TARGET_TRIPLE
)
234 # WebAssembly floating-point match doesn't trap.
235 # TODO: Add -fno-signaling-nans when the compiler supports it.
236 CFLAGS
+= -fno-trapping-math
237 # Add all warnings, but disable a few which occur in third-party code.
238 CFLAGS
+= -Wall
-Wextra
-Werror \
239 -Wno-null-pointer-arithmetic \
240 -Wno-unused-parameter \
242 -Wno-unused-variable \
243 -Wno-unused-function \
244 -Wno-ignored-attributes \
245 -Wno-missing-braces \
246 -Wno-ignored-pragmas \
247 -Wno-unused-but-set-variable \
248 -Wno-unknown-warning-option
250 # Configure support for threads.
251 ifeq ($(THREAD_MODEL
), single
)
252 CFLAGS
+= -mthread-model single
254 ifeq ($(THREAD_MODEL
), posix
)
255 # Specify the tls-model until LLVM 15 is released (which should contain
256 # https://reviews.llvm.org/D130053).
257 CFLAGS
+= -mthread-model posix
-pthread
-ftls-model
=local-exec
260 # Expose the public headers to the implementation. We use `-isystem` for
261 # purpose for two reasons:
263 # 1. It only does `<...>` not `"...."` lookup. We are making a libc,
264 # which is a system library, so all public headers should be
265 # accessible via `<...>` and never also need `"..."`. `-isystem` main
266 # purpose is to only effect `<...>` lookup.
268 # 2. The `-I` for private headers added for specific C files below
269 # should come earlier in the search path, so they can "override"
270 # and/or `#include_next` the public headers. `-isystem` (like
271 # `-idirafter`) comes later in the search path than `-I`.
272 CFLAGS
+= -isystem
"$(SYSROOT_INC)"
274 # These variables describe the locations of various files and directories in
276 objs
= $(patsubst $(CURDIR
)/%.c
,$(OBJDIR
)/%.o
,$(1))
277 DLMALLOC_OBJS
= $(call objs
,$(DLMALLOC_SOURCES
))
278 LIBC_BOTTOM_HALF_ALL_OBJS
= $(call objs
,$(LIBC_BOTTOM_HALF_ALL_SOURCES
))
279 LIBC_TOP_HALF_ALL_OBJS
= $(call objs
,$(LIBC_TOP_HALF_ALL_SOURCES
))
280 ifeq ($(MALLOC_IMPL
),dlmalloc
)
281 LIBC_OBJS
+= $(DLMALLOC_OBJS
)
282 else ifeq ($(MALLOC_IMPL
),none
)
283 # No object files to add.
285 $(error unknown malloc implementation
$(MALLOC_IMPL
))
287 # Add libc-bottom-half's objects.
288 LIBC_OBJS
+= $(LIBC_BOTTOM_HALF_ALL_OBJS
)
289 ifeq ($(BUILD_LIBC_TOP_HALF
),yes
)
290 # libc-top-half is musl.
291 LIBC_OBJS
+= $(LIBC_TOP_HALF_ALL_OBJS
)
293 MUSL_PRINTSCAN_OBJS
= $(call objs
,$(MUSL_PRINTSCAN_SOURCES
))
294 MUSL_PRINTSCAN_LONG_DOUBLE_OBJS
= $(patsubst %.o
,%.long-double.o
,$(MUSL_PRINTSCAN_OBJS
))
295 MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS
= $(patsubst %.o
,%.no-floating-point.o
,$(MUSL_PRINTSCAN_OBJS
))
296 BULK_MEMORY_OBJS
= $(call objs
,$(BULK_MEMORY_SOURCES
))
297 LIBWASI_EMULATED_MMAN_OBJS
= $(call objs
,$(LIBWASI_EMULATED_MMAN_SOURCES
))
298 LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS
= $(call objs
,$(LIBWASI_EMULATED_PROCESS_CLOCKS_SOURCES
))
299 LIBWASI_EMULATED_GETPID_OBJS
= $(call objs
,$(LIBWASI_EMULATED_GETPID_SOURCES
))
300 LIBWASI_EMULATED_SIGNAL_OBJS
= $(call objs
,$(LIBWASI_EMULATED_SIGNAL_SOURCES
))
301 LIBWASI_EMULATED_SIGNAL_MUSL_OBJS
= $(call objs
,$(LIBWASI_EMULATED_SIGNAL_MUSL_SOURCES
))
303 # These variables describe the locations of various files and
304 # directories in the generated sysroot tree.
305 SYSROOT_LIB
:= $(SYSROOT
)/lib
/$(MULTIARCH_TRIPLE
)
306 SYSROOT_INC
= $(SYSROOT
)/include
307 SYSROOT_SHARE
= $(SYSROOT
)/share
/$(MULTIARCH_TRIPLE
)
309 # Files from musl's include directory that we don't want to install in the
310 # sysroot's include directory.
313 # Remove files which aren't headers (we generate alltypes.h below).
314 MUSL_OMIT_HEADERS
+= \
315 "bits/syscall.h.in" \
316 "bits/alltypes.h.in" \
319 # Use the compiler's version of these headers.
320 MUSL_OMIT_HEADERS
+= \
324 # Use the WASI errno definitions.
325 MUSL_OMIT_HEADERS
+= \
328 # Remove headers that aren't supported yet or that aren't relevant for WASI.
329 MUSL_OMIT_HEADERS
+= \
332 "sys/kd.h" "sys/vt.h" "sys/soundcard.h" "sys/sem.h" \
333 "sys/shm.h" "sys/msg.h" "sys/ipc.h" "sys/ptrace.h" \
335 "bits/kd.h" "bits/vt.h" "bits/soundcard.h" "bits/sem.h" \
336 "bits/shm.h" "bits/msg.h" "bits/ipc.h" "bits/ptrace.h" \
340 "syslog.h" "sys/syslog.h" \
341 "wait.h" "sys/wait.h" \
342 "ucontext.h" "sys/ucontext.h" \
348 "sys/epoll.h" "sys/reboot.h" "sys/swap.h" \
349 "sys/sendfile.h" "sys/inotify.h" \
358 "sys/personality.h" \
359 "elf.h" "link.h" "bits/link.h" \
360 "scsi/scsi.h" "scsi/scsi_ioctl.h" "scsi/sg.h" \
362 "pwd.h" "shadow.h" "grp.h" \
382 "netinet/if_ether.h" \
389 ifeq ($(THREAD_MODEL
), single
)
390 # Remove headers not supported in single-threaded mode.
391 MUSL_OMIT_HEADERS
+= "pthread.h"
396 $(SYSROOT_LIB
)/libc.a
: $(LIBC_OBJS
)
398 $(SYSROOT_LIB
)/libc-printscan-long-double.a
: $(MUSL_PRINTSCAN_LONG_DOUBLE_OBJS
)
400 $(SYSROOT_LIB
)/libc-printscan-no-floating-point.a
: $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS
)
402 $(SYSROOT_LIB
)/libwasi-emulated-mman.a
: $(LIBWASI_EMULATED_MMAN_OBJS
)
404 $(SYSROOT_LIB
)/libwasi-emulated-process-clocks.a
: $(LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS
)
406 $(SYSROOT_LIB
)/libwasi-emulated-getpid.a
: $(LIBWASI_EMULATED_GETPID_OBJS
)
408 $(SYSROOT_LIB
)/libwasi-emulated-signal.a
: $(LIBWASI_EMULATED_SIGNAL_OBJS
) $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS
)
412 # On Windows, the commandline for the ar invocation got too long, so it needs to be split up.
413 $(AR
) crs
$@
$(wordlist
1, 199, $^
)
414 $(AR
) crs
$@
$(wordlist
200, 399, $^
)
415 $(AR
) crs
$@
$(wordlist
400, 599, $^
)
416 $(AR
) crs
$@
$(wordlist
600, 799, $^
)
417 # This might eventually overflow again, but at least it'll do so in a loud way instead of
418 # silently dropping the tail.
419 $(AR
) crs
$@
$(wordlist
800, 100000, $^
)
421 $(MUSL_PRINTSCAN_OBJS
): CFLAGS
+= \
422 -D__wasilibc_printscan_no_long_double \
423 -D__wasilibc_printscan_full_support_option
="\"add -lc-printscan-long-double to the link command\""
425 $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS
): CFLAGS
+= \
426 -D__wasilibc_printscan_no_floating_point \
427 -D__wasilibc_printscan_floating_point_support_option
="\"remove -lc-printscan-no-floating-point from the link command\""
429 # TODO: apply -mbulk-memory globally, once
430 # https://github.com/llvm/llvm-project/issues/52618 is resolved
431 $(BULK_MEMORY_OBJS
): CFLAGS
+= \
434 $(BULK_MEMORY_OBJS
): CFLAGS
+= \
435 -DBULK_MEMORY_THRESHOLD
=$(BULK_MEMORY_THRESHOLD
)
437 $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS
): CFLAGS
+= \
438 -D_WASI_EMULATED_SIGNAL
440 $(OBJDIR
)/%.long-double.o
: $(CURDIR
)/%.c include_dirs
442 $(CC
) $(CFLAGS
) -MD
-MP
-o
$@
-c
$<
444 $(OBJDIR
)/%.no-floating-point.o
: $(CURDIR
)/%.c include_dirs
446 $(CC
) $(CFLAGS
) -MD
-MP
-o
$@
-c
$<
448 $(OBJDIR
)/%.o
: $(CURDIR
)/%.c include_dirs
450 $(CC
) $(CFLAGS
) -MD
-MP
-o
$@
-c
$<
452 -include $(shell find
$(OBJDIR
) -name \
*.d
)
454 $(DLMALLOC_OBJS
): CFLAGS
+= \
457 startup_files
$(LIBC_BOTTOM_HALF_ALL_OBJS
): CFLAGS
+= \
458 -I
$(LIBC_BOTTOM_HALF_HEADERS_PRIVATE
) \
459 -I
$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_INC
) \
460 -I
$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC
) \
461 -I
$(LIBC_TOP_HALF_MUSL_SRC_DIR
)/include \
462 -I
$(LIBC_TOP_HALF_MUSL_SRC_DIR
)/internal
464 $(LIBC_TOP_HALF_ALL_OBJS
) $(MUSL_PRINTSCAN_LONG_DOUBLE_OBJS
) $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS
) $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS
): CFLAGS
+= \
465 -I
$(LIBC_TOP_HALF_MUSL_SRC_DIR
)/include \
466 -I
$(LIBC_TOP_HALF_MUSL_SRC_DIR
)/internal \
467 -I
$(LIBC_TOP_HALF_MUSL_DIR
)/arch
/wasm32 \
468 -I
$(LIBC_TOP_HALF_MUSL_DIR
)/arch
/generic \
469 -I
$(LIBC_TOP_HALF_HEADERS_PRIVATE
) \
471 -Wno-shift-op-parentheses \
472 -Wno-bitwise-op-parentheses \
473 -Wno-logical-op-parentheses \
474 -Wno-string-plus-int \
478 $(LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS
): CFLAGS
+= \
479 -I
$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC
)
483 # Install the include files.
485 mkdir
-p
"$(SYSROOT_INC)"
486 cp
-r
"$(LIBC_BOTTOM_HALF_HEADERS_PUBLIC)"/* "$(SYSROOT_INC)"
488 # Generate musl's bits/alltypes.h header.
489 mkdir
-p
"$(SYSROOT_INC)/bits"
490 sed
-f
$(LIBC_TOP_HALF_MUSL_DIR
)/tools
/mkalltypes.sed \
491 $(LIBC_TOP_HALF_MUSL_DIR
)/arch
/wasm32
/bits
/alltypes.h.in \
492 $(LIBC_TOP_HALF_MUSL_DIR
)/include/alltypes.h.in \
493 > "$(SYSROOT_INC)/bits/alltypes.h"
495 # Copy in the bulk of musl's public header files.
496 cp
-r
"$(LIBC_TOP_HALF_MUSL_INC)"/* "$(SYSROOT_INC)"
497 # Copy in the musl's "bits" header files.
498 cp
-r
"$(LIBC_TOP_HALF_MUSL_DIR)"/arch
/generic
/bits
/* "$(SYSROOT_INC)/bits"
499 cp
-r
"$(LIBC_TOP_HALF_MUSL_DIR)"/arch
/wasm32
/bits
/* "$(SYSROOT_INC)/bits"
501 # Remove selected header files.
502 $(RM
) $(patsubst %,$(SYSROOT_INC
)/%,$(MUSL_OMIT_HEADERS
))
504 startup_files
: include_dirs
506 # Build the startup files.
508 @mkdir
-p
"$(OBJDIR)"
510 $(CC
) $(CFLAGS
) -c
$(LIBC_BOTTOM_HALF_CRT_SOURCES
) -MD
-MP
&& \
511 mkdir
-p
"$(SYSROOT_LIB)" && \
512 mv
*.o
"$(SYSROOT_LIB)"
515 $(SYSROOT_LIB
)/libc.a \
516 $(SYSROOT_LIB
)/libc-printscan-long-double.a \
517 $(SYSROOT_LIB
)/libc-printscan-no-floating-point.a \
518 $(SYSROOT_LIB
)/libwasi-emulated-mman.a \
519 $(SYSROOT_LIB
)/libwasi-emulated-process-clocks.a \
520 $(SYSROOT_LIB
)/libwasi-emulated-getpid.a \
521 $(SYSROOT_LIB
)/libwasi-emulated-signal.a
523 finish
: startup_files libc
525 # Create empty placeholder libraries.
527 for name in m rt pthread crypt util xnet resolv dl
; do \
528 $(AR
) crs
"$(SYSROOT_LIB)/lib$${name}.a"; \
532 # The build succeeded! The generated sysroot is in $(SYSROOT).
535 # The check for defined and undefined symbols expects there to be a heap
536 # alloctor (providing malloc, calloc, free, etc). Skip this step if the build
537 # is done without a malloc implementation.
538 ifneq ($(MALLOC_IMPL
),none
)
539 finish
: check-symbols
542 DEFINED_SYMBOLS
= $(SYSROOT_SHARE
)/defined-symbols.txt
543 UNDEFINED_SYMBOLS
= $(SYSROOT_SHARE
)/undefined-symbols.txt
545 check-symbols
: startup_files libc
547 # Collect metadata on the sysroot and perform sanity checks.
549 mkdir
-p
"$(SYSROOT_SHARE)"
552 # Collect symbol information.
554 @
# TODO: Use llvm-nm --extern-only instead of grep. This is blocked on
555 @
# LLVM PR40497, which is fixed in 9.0, but not in 8.0.
556 @
# Ignore certain llvm builtin symbols such as those starting with __mul
557 @
# since these dependencies can vary between llvm versions.
558 "$(NM)" --defined-only
"$(SYSROOT_LIB)"/libc.a
"$(SYSROOT_LIB)"/libwasi-emulated-
*.a
"$(SYSROOT_LIB)"/*.o \
559 |grep
' [[:upper:]] ' |sed
's/.* [[:upper:]] //' |LC_ALL
=C
sort |uniq
> "$(DEFINED_SYMBOLS)"
560 for undef_sym in
$$("$(NM)" --undefined-only
"$(SYSROOT_LIB)"/libc.a
"$(SYSROOT_LIB)"/libc-
*.a
"$(SYSROOT_LIB)"/*.o \
561 |grep
' U ' |sed
's/.* U //' |LC_ALL
=C
sort |uniq
); do \
562 grep
-q
'\<'$$undef_sym'\>' "$(DEFINED_SYMBOLS)" || echo
$$undef_sym; \
563 done | grep
-v
"^__mul" > "$(UNDEFINED_SYMBOLS)"
564 grep
'^_*imported_wasi_' "$(UNDEFINED_SYMBOLS)" \
565 > "$(SYSROOT_LIB)/libc.imports"
568 # Generate a test file that includes all public C header files.
570 cd
"$(SYSROOT_INC)" && \
571 for header in
$$(find .
-type f
-not
-name mman.h
-not
-name signal.h
-not
-name times.h
-not
-name resource.h |grep
-v
/bits
/ |grep
-v
/c
++/); do \
572 echo
'#include <'$$header'>' | sed
's/\.\///' ; \
573 done |LC_ALL
=C
sort >$(SYSROOT_SHARE
)/include-all.c
; \
577 # Test that it compiles.
579 $(CC
) $(CFLAGS
) -fsyntax-only
"$(SYSROOT_SHARE)/include-all.c" -Wno-\
#warnings
582 # Collect all the predefined macros, except for compiler version macros
583 # which we don't need to track here.
586 @
# For the __*_ATOMIC_*_LOCK_FREE macros, squash individual compiler names
587 @
# to attempt, toward keeping these files compiler-independent.
589 @
# We have to add `-isystem $(SYSROOT_INC)` because otherwise clang puts
590 @
# its builtin include path first, which produces compiler-specific
593 @
# TODO: Undefine __FLOAT128__ for now since it's not in clang 8.0.
594 @
# TODO: Filter out __FLT16_* for now, as not all versions of clang have these.
595 @
# TODO: Filter out __NO_MATH_ERRNO_ and a few __*WIDTH__ that are new to clang 14.
596 @
# TODO: clang defined __FLT_EVAL_METHOD__ until clang 15, so we force-undefine it
597 @
# for older versions.
598 $(CC
) $(CFLAGS
) "$(SYSROOT_SHARE)/include-all.c" \
599 -isystem
$(SYSROOT_INC
) \
601 -E
-dM
-Wno-\
#warnings \
607 -U__clang_patchlevel__ \
608 -U__clang_version__ \
609 -U__clang_literal_encoding__ \
610 -U__clang_wide_literal_encoding__ \
613 -U__GNUC_PATCHLEVEL__ \
616 -U__NO_MATH_ERRNO__ \
617 -U__BITINT_MAXWIDTH__ \
618 -U__FLT_EVAL_METHOD__
-Wno-builtin-macro-redefined \
619 | sed
-e
's/__[[:upper:][:digit:]]*_ATOMIC_\([[:upper:][:digit:]_]*\)_LOCK_FREE/__compiler_ATOMIC_\1_LOCK_FREE/' \
620 | grep
-v
'^#define __FLT16_' \
621 | grep
-v
'^#define __\(BOOL\|INT_\(LEAST\|FAST\)\(8\|16\|32\|64\)\|INT\|LONG\|LLONG\|SHRT\)_WIDTH__' \
622 > "$(SYSROOT_SHARE)/predefined-macros.txt"
624 # Check that the computed metadata matches the expected metadata.
625 # This ignores whitespace because on Windows the output has CRLF line endings.
626 diff
-wur
"$(CURDIR)/expected/$(MULTIARCH_TRIPLE)/$(THREAD_MODEL)" "$(SYSROOT_SHARE)"
629 mkdir
-p
"$(INSTALL_DIR)"
630 cp
-r
"$(SYSROOT)/lib" "$(SYSROOT)/share" "$(SYSROOT)/include" "$(INSTALL_DIR)"
634 $(RM
) -r
"$(SYSROOT)"
636 .PHONY
: default startup_files libc finish
install include_dirs
clean