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cosmopolitan/build/definitions.mk
Justine Tunney 791f79fcb3
Make improvements 
- We now serialize the file descriptor table when spawning / executing
  processes on Windows. This means you can now inherit more stuff than
  just standard i/o. It's needed by bash, which duplicates the console
  to file descriptor #255. We also now do a better job serializing the
  environment variables, so you're less likely to encounter E2BIG when
  using your bash shell. We also no longer coerce environ to uppercase

- execve() on Windows now remotely controls its parent process to make
  them spawn a replacement for itself. Then it'll be able to terminate
  immediately once the spawn succeeds, without having to linger around
  for the lifetime as a shell process for proxying the exit code. When
  process worker thread running in the parent sees the child die, it's
  given a handle to the new child, to replace it in the process table.

- execve() and posix_spawn() on Windows will now provide CreateProcess
  an explicit handle list. This allows us to remove handle locks which
  enables better fork/spawn concurrency, with seriously correct thread
  safety. Other codebases like Go use the same technique. On the other
  hand fork() still favors the conventional WIN32 inheritence approach
  which can be a little bit messy, but is *controlled* by guaranteeing
  perfectly clean slates at both the spawning and execution boundaries

- sigset_t is now 64 bits. Having it be 128 bits was a mistake because
  there's no reason to use that and it's only supported by FreeBSD. By
  using the system word size, signal mask manipulation on Windows goes
  very fast. Furthermore @asyncsignalsafe funcs have been rewritten on
  Windows to take advantage of signal masking, now that it's much more
  pleasant to use.

- All the overlapped i/o code on Windows has been rewritten for pretty
  good signal and cancelation safety. We're now able to ensure overlap
  data structures are cleaned up so long as you don't longjmp() out of
  out of a signal handler that interrupted an i/o operation. Latencies
  are also improved thanks to the removal of lots of "busy wait" code.
  Waits should be optimal for everything except poll(), which shall be
  the last and final demon we slay in the win32 i/o horror show.

- getrusage() on Windows is now able to report RUSAGE_CHILDREN as well
  as RUSAGE_SELF, thanks to aggregation in the process manager thread.
2023-10-08 08:59:53 -07:00

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Makefile
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#-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
#───vi: set et ft=make ts=8 tw=8 fenc=utf-8 :vi───────────────────────┘
#
# SYNOPSIS
#
# Cosmopolitan Core Build Definitions
#
# DESCRIPTION
#
# Nearly all compiler flag tuning is done within this one file. Flags
# may be customized with environment variables. We also use this file
# to compute expensive values once per build.
#
# When tuning the variables below, please note they're interpreted in
# the strictest sense. For example, we don't pass CFLAGS to gcc if we
# know it's compiling a .S file. This enables our `make V=0` logging
# to be succinct and informative at the cost of being less forgiving.
#
# Further note that link order is equally unforgiving in repositories
# of this scale. We approach that by over-specifying dependencies, in
# packages that're broken down usually on a per-directory basis. This
# is aided by the checkdeps and functional programming tools which in
# most cases should be able to deduce correct ordering automatically.
#
# Concerning our approach to flag tuning, most of it is non-essential
# and largely serves to turn features off. Particularly features that
# would otherwise lock us in to a particular platform or legal terms.
# Other flags will usually be the ones that provide us marginal gains
# in terms of performance and code size, but the world won't end when
# they aren't used. Flags that play a critical role in source working
# correctly will usually be specified on a object-by-object basis, in
# their respective packages.
#
# VARIABLES
#
# Our configuration variables, ordered by increasing preference:
#
# CCFLAGS frontend flags (.i, .c, .cc, .f, .S, .lds, etc.)
# OFLAGS objectify flags (precludes -S and -E)
# CPPFLAGS preprocessor flags (.h, .c, .cc, .S, .inc, .lds, etc.)
# TARGET_ARCH microarchitecture flags (e.g. -march=native)
# COPTS c/c++ flags (.c, .cc)
# CFLAGS c flags (.c only)
# CXXFLAGS c++ flags (.cc only)
# LDFLAGS linker flags (don't use -Wl, frontend prefix)
# ASFLAGS assembler flags (don't use -Wa, frontend prefix)
#
# For each FOO above, there exists (by increasing preference)
#
# DEFAULT_FOO see build/definitions.mk
# CONFIG_FOO see build/config.mk
# FOO set ~/.cosmo.mk and target-specific
# OVERRIDE_FOO set ~/.cosmo.mk and target-specific (use rarely)
#
LC_ALL = C
SOURCE_DATE_EPOCH = 0
ARFLAGS = rcsD
ZFLAGS ?=
XARGS ?= xargs -P4 -rs8000
DOT ?= dot
CLANG = clang
TMPDIR = o/tmp
AR = build/bootstrap/ar.com
CP = build/bootstrap/cp.com
RM = build/bootstrap/rm.com -f
GZIP = build/bootstrap/gzip.com
ECHO = build/bootstrap/echo.com
CHMOD = build/bootstrap/chmod.com
TOUCH = build/bootstrap/touch.com
PKG = build/bootstrap/package.com
MKDEPS = build/bootstrap/mkdeps.com
ZIPOBJ = build/bootstrap/zipobj.com
ZIPCOPY = build/bootstrap/zipcopy.com
PECHECK = build/bootstrap/pecheck.com
FIXUPOBJ = build/bootstrap/fixupobj.com
MKDIR = build/bootstrap/mkdir.com -p
COMPILE = build/bootstrap/compile.com -V9 -P4096 $(QUOTA)
COMMA := ,
PWD := $(shell build/bootstrap/pwd.com)
IGNORE := $(shell $(MKDIR) $(TMPDIR))
ifneq ($(findstring aarch64,$(MODE)),)
ARCH = aarch64
HOSTS ?= pi silicon
else
ARCH = x86_64
HOSTS ?= freebsd rhel7 xnu win10 openbsd netbsd
endif
ifeq ($(PREFIX),)
ifeq ($(USE_SYSTEM_TOOLCHAIN),)
ifneq ("$(wildcard o/third_party/gcc/bin/x86_64-pc-linux-gnu-*)","")
PREFIX = o/third_party/gcc/bin/x86_64-pc-linux-gnu-
else
IGNORE := $(shell build/bootstrap/unbundle.com)
PREFIX = o/third_party/gcc/bin/x86_64-linux-musl-
endif
ifeq ($(ARCH), aarch64)
PREFIX = o/third_party/gcc/bin/aarch64-linux-musl-
endif
endif
endif
AS = $(PREFIX)as
CC = $(PREFIX)gcc
CXX = $(PREFIX)g++
CXXFILT = $(PREFIX)c++filt
LD = $(PREFIX)ld.bfd
NM = $(PREFIX)nm
GCC = $(PREFIX)gcc
STRIP = $(PREFIX)strip
OBJCOPY = $(PREFIX)objcopy
OBJDUMP = $(PREFIX)objdump
ifneq ($(wildcard $(PWD)/$(PREFIX)addr2line), )
ADDR2LINE = $(PWD)/$(PREFIX)addr2line
else
ADDR2LINE = $(PREFIX)addr2line
endif
export ADDR2LINE
export LC_ALL
export MKDIR
export MODE
export SOURCE_DATE_EPOCH
export TMPDIR
ifeq ($(LANDLOCKMAKE_VERSION),)
TMPSAFE = $(join $(TMPDIR),$(subst /,_,$@)).tmp
else
TMPSAFE = $(TMPDIR)/
endif
BACKTRACES = \
-fno-optimize-sibling-calls \
-mno-omit-leaf-frame-pointer
ifneq ($(ARCH), aarch64)
BACKTRACES += -fno-schedule-insns2
endif
SANITIZER = \
-fsanitize=address
NO_MAGIC = \
-ffreestanding \
-fno-stack-protector \
-fwrapv \
-fno-sanitize=all \
-fpatchable-function-entry=0,0
OLD_CODE = \
-fno-strict-aliasing \
-fno-strict-overflow
TRADITIONAL = \
-Wno-implicit-int \
-Wno-return-type \
-Wno-pointer-sign
DEFAULT_CCFLAGS += \
-Wall \
-Werror \
-fno-omit-frame-pointer \
-frecord-gcc-switches
DEFAULT_COPTS ?= \
-fno-math-errno \
-fno-ident \
-fno-common \
-fno-gnu-unique \
-fstrict-aliasing \
-fstrict-overflow \
-fno-semantic-interposition \
-fno-dwarf2-cfi-asm \
-fno-unwind-tables \
-fno-asynchronous-unwind-tables
ifeq ($(ARCH), x86_64)
# Microsoft says "[a]ny memory below the stack beyond the red zone
# [note: Windows defines the x64 red zone size as 0] is considered
# volatile and may be modified by the operating system at any time."
# https://devblogs.microsoft.com/oldnewthing/20190111-00/?p=100685
DEFAULT_COPTS += \
-mno-red-zone \
-mno-tls-direct-seg-refs
endif
ifeq ($(ARCH), aarch64)
#
# - Apple says in "Writing ARM64 code for Apple platforms" that we're
# not allowed to use the x18 register.
#
# - Cosmopolitan Libc uses x28 for thread-local storage because Apple
# forbids us from using tpidr_el0 too.
#
# - Cosmopolitan currently lacks an implementation of the runtime
# libraries needed by the -moutline-atomics flag
#
DEFAULT_COPTS += \
-ffixed-x18 \
-ffixed-x28 \
-mno-outline-atomics
endif
MATHEMATICAL = \
-O3 \
-fwrapv
DEFAULT_CPPFLAGS += \
-D_COSMO_SOURCE \
-DMODE='"$(MODE)"' \
-nostdinc \
-iquote .
DEFAULT_CFLAGS = \
-std=gnu2x
DEFAULT_CXXFLAGS = \
-fno-rtti \
-fno-exceptions \
-fuse-cxa-atexit \
-Wno-int-in-bool-context \
-Wno-narrowing \
-Wno-literal-suffix
DEFAULT_ASFLAGS = \
-W \
-I. \
--noexecstack
DEFAULT_LDFLAGS = \
-static \
-nostdlib \
-znorelro \
--gc-sections \
--build-id=none \
--no-dynamic-linker
# # generate linker report files
# DEFAULT_LDFLAGS += --cref -Map=$@.map
ifeq ($(ARCH), aarch64)
DEFAULT_LDFLAGS += \
-zmax-page-size=0x4000 \
-zcommon-page-size=0x4000 \
-znorelro
else
DEFAULT_LDFLAGS += \
-zmax-page-size=0x4000 \
-zcommon-page-size=0x1000
endif
ASONLYFLAGS = \
-c \
-g
DEFAULT_LDLIBS =
MCA = llvm-mca-10 \
-mtriple=x86_64-pc-linux-gnu \
-instruction-info \
-iterations=3 \
-all-stats \
-all-views \
-timeline
cc.flags = \
$(DEFAULT_CCFLAGS) \
$(CONFIG_CCFLAGS) \
$(CCFLAGS) \
$(OVERRIDE_CCFLAGS)
o.flags = \
$(DEFAULT_OFLAGS) \
$(CONFIG_OFLAGS) \
$(OFLAGS) \
$(OVERRIDE_OFLAGS)
cpp.flags = \
$(DEFAULT_CPPFLAGS) \
$(CONFIG_CPPFLAGS) \
$(CPPFLAGS) \
$(OVERRIDE_CPPFLAGS) \
-include libc/integral/normalize.inc
copt.flags = \
$(TARGET_ARCH) \
$(DEFAULT_COPTS) \
$(CONFIG_COPTS) \
$(COPTS) \
$(OVERRIDE_COPTS)
f.flags = \
$(DEFAULT_FFLAGS) \
$(CONFIG_FFLAGS) \
$(FFLAGS) \
$(OVERRIDE_FFLAGS)
c.flags = \
$(DEFAULT_CFLAGS) \
$(CONFIG_CFLAGS) \
$(CFLAGS) \
$(OVERRIDE_CFLAGS)
cxx.flags = \
$(DEFAULT_CXXFLAGS) \
$(CONFIG_CXXFLAGS) \
$(CXXFLAGS) \
$(OVERRIDE_CXXFLAGS)
s.flags = \
$(DEFAULT_ASFLAGS) \
$(CONFIG_ASFLAGS) \
$(ASFLAGS) \
$(OVERRIDE_ASFLAGS)
S.flags = $(addprefix -Wa$(COMMA),$(s.flags))
LD.libs = \
$(LDLIBS) \
$(LOADLIBES) \
$(DEFAULT_LDLIBS) \
$(CONFIG_LDLIBS) \
$(LDLIBS) \
$(DEFAULT_LIBS) \
$(CONFIG_LIBS) \
$(LIBS)
COMPILE.c.flags = $(cc.flags) $(copt.flags) $(cpp.flags) $(c.flags)
COMPILE.cxx.flags = $(cc.flags) $(copt.flags) $(cpp.flags) $(cxx.flags)
COMPILE.i.flags = $(cc.flags) $(copt.flags) $(c.flags)
COMPILE.ii.flags = $(cc.flags) $(copt.flags) $(cxx.flags)
LINK.flags = $(DEFAULT_LDFLAGS) $(CONFIG_LDFLAGS) $(LDFLAGS)
OBJECTIFY.c.flags = $(cc.flags) $(o.flags) $(S.flags) $(cpp.flags) $(copt.flags) $(c.flags)
OBJECTIFY.cxx.flags = $(cc.flags) $(o.flags) $(S.flags) $(cpp.flags) $(copt.flags) $(cxx.flags)
OBJECTIFY.s.flags = $(ASONLYFLAGS) $(s.flags)
OBJECTIFY.S.flags = $(cc.flags) $(o.flags) $(S.flags) $(cpp.flags)
PREPROCESS.flags = -E $(copt.flags) $(cc.flags) $(cpp.flags)
PREPROCESS.lds.flags = -D__LINKER__ $(filter-out -g%,$(PREPROCESS.flags)) -P -xc
COMPILE.c = $(CC) -S $(COMPILE.c.flags)
COMPILE.cxx = $(CXX) -S $(COMPILE.cxx.flags)
COMPILE.i = $(CC) -S $(COMPILE.i.flags)
OBJECTIFY.s = $(AS) $(OBJECTIFY.s.flags)
OBJECTIFY.S = $(CC) $(OBJECTIFY.S.flags) -c
OBJECTIFY.c = $(CC) $(OBJECTIFY.c.flags) -c
OBJECTIFY.cxx = $(CXX) $(OBJECTIFY.cxx.flags) -c
PREPROCESS = $(CC) $(PREPROCESS.flags)
PREPROCESS.lds = $(CC) $(PREPROCESS.lds.flags)
LINK = $(LD) $(LINK.flags)
ELF = o/libc/elf/elf.lds
ELFLINK = $(COMPILE) -ALINK.elf $(LINK) $(LINKARGS) $(OUTPUT_OPTION) && $(COMPILE) -AFIXUP.ape -T$@ $(FIXUPOBJ) $@
LINKARGS = $(patsubst %.lds,-T %.lds,$(call uniqr,$(LD.libs) $(filter-out %.pkg,$^)))
# The compiler won't generate %xmm code for sources extensioned .greg.c,
# which is needed for C modules wanting to run at the executive level or
# during privileged runtime states, e.g. code morphing.
OBJECTIFY.greg.c = \
$(CC) \
$(filter-out -pg,$(OBJECTIFY.c.flags)) \
-D__MGENERAL_REGS_ONLY__ \
-mgeneral-regs-only \
-fno-stack-protector \
-fno-instrument-functions \
-fno-optimize-sibling-calls \
-fno-sanitize=all \
-ffreestanding \
-fwrapv \
-c
TAGSFLAGS = \
-e \
-a \
--if0=no \
--langmap=c:.c.h.i \
--line-directives=yes \
--exclude=libc/nt/struct/imagefileheader.internal.h \
--exclude=libc/nt/struct/filesegmentelement.h
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