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cosmopolitan/build/definitions.mk
Justine Tunney b9d6e6e348
Standardize on -fsigned-char 
MaGuess on Discord pointed out the fact that cosmocc contradicts itself
on the signedness of `char`. It's up to each platform to choose one, so
the cosmo platform shall choose signed. The rationale is it makes the C
language syntax more internally similar. `char` should be `signed char`
for the same reason `int` means `signed int`. It's recommended that you
still assume `char` could go either way since that's portable thinking.
But if you want to assume we'll always have signed char, that's ok too.
2024-03-30 21:46:08 -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 sw=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)
#
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-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 \
-fsigned-char \
-mno-outline-atomics
endif
MATHEMATICAL = \
-O3 \
-fwrapv
DEFAULT_CPPFLAGS += \
-D_COSMO_SOURCE \
-DMODE='"$(MODE)"' \
-Wno-prio-ctor-dtor \
-Wno-unknown-pragmas \
-nostdinc \
-iquote. \
-isystem libc/isystem
DEFAULT_CFLAGS = \
-std=gnu2x
DEFAULT_CXXFLAGS = \
-fno-rtti \
-fno-exceptions \
-fuse-cxa-atexit \
-Wno-int-in-bool-context \
-Wno-narrowing \
-Wno-literal-suffix
DEFAULT_ASFLAGS = \
-W \
-I. \
--noexecstack
DEFAULT_LDFLAGS = \
-static \
-nostdlib \
-znorelro \
--gc-sections \
-z noexecstack \
--build-id=none \
--no-dynamic-linker
# # generate linker report files
# DEFAULT_LDFLAGS += --cref -Map=$@.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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