#-*-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───────────────────────┘

# Default Mode
#
#   - `make`
#   - Optimized
#   - Backtraces
#   - Debuggable
#   - Syscall tracing
#   - Function tracing
#   - Reasonably small
#
ifeq ($(MODE),)
CONFIG_CCFLAGS += $(BACKTRACES) $(FTRACE) -O2
CONFIG_CPPFLAGS += -DSYSDEBUG
TARGET_ARCH ?= -msse3
endif

ifeq ($(MODE), aarch64)
CONFIG_CCFLAGS += -O2  # $(BACKTRACES) $(FTRACE)
CONFIG_CPPFLAGS += -DSYSDEBUG
endif

# Fast Build Mode
#
#   - `make MODE=fastbuild`
#   - No debugging
#   - Syscall tracing
#   - Function tracing
#   - Some optimizations
#   - Limited Backtraces
#   - Compiles 28% faster
#
ifeq ($(MODE),fastbuild)
CONFIG_CCFLAGS += $(BACKTRACES) $(FTRACE) -O
CONFIG_CPPFLAGS += -DSYSDEBUG -DDWARFLESS
CONFIG_OFLAGS += -g0
CONFIG_LDFLAGS += -S
TARGET_ARCH ?= -msse3
endif

# Optimized Mode
#
#   - `make MODE=opt`
#   - Backtraces
#   - More optimized
#   - Syscall tracing
#   - Function tracing
#   - Reasonably small
#   - No memory corruption detection
#   - assert() / CHECK_xx() may leak code into binary for debuggability
#   - GCC 8+ hoists check fails into .text.cold, thus minimizing impact
#
ifeq ($(MODE), opt)
CONFIG_CPPFLAGS += -DNDEBUG -DSYSDEBUG -msse2avx -Wa,-msse2avx
CONFIG_CCFLAGS += $(BACKTRACES) $(FTRACE) -O3 -fmerge-all-constants
TARGET_ARCH ?= -march=native
endif

# Optimized Linux Mode
#
#   - `make MODE=optlinux`
#   - Turns on red zone
#   - Turns off backtraces
#   - Turns off function tracing
#   - Turns off support for older cpu models
#   - Turns off support for other operating systems
#
ifeq ($(MODE), optlinux)
CONFIG_CPPFLAGS += -DNDEBUG -msse2avx -Wa,-msse2avx -DSUPPORT_VECTOR=1
CONFIG_CCFLAGS += -O3 -fmerge-all-constants
DEFAULT_COPTS += -mred-zone
TARGET_ARCH ?= -march=native
endif

# Release Mode
#
# Follows traditional closed source release binary norms.
#
#   - `make MODE=rel`
#   - More optimized
#   - Reasonably small
#   - Numeric backtraces
#   - Toilsome debuggability
#   - assert() statements removed
#   - DCHECK_xx() statements removed
#   - No memory corruption detection
#   - CHECK_xx() won't leak strings into binary
#
ifeq ($(MODE), rel)
CONFIG_CPPFLAGS += -DNDEBUG
CONFIG_CCFLAGS += $(BACKTRACES) -O2
TARGET_ARCH ?= -msse3
PYFLAGS += -O1
endif

# Asan Mode
#
# Safer binaries good for backend production serving.
#
#   - `make MODE=asan`
#   - Memory safety
#   - Production worthy
#   - Backtraces
#   - Debuggability
#   - Larger binaries
#
ifeq ($(MODE), asan)
CONFIG_CCFLAGS += $(BACKTRACES) -O2 -DSYSDEBUG
CONFIG_COPTS += -fsanitize=address
TARGET_ARCH ?= -msse3
endif

# Debug Mode
#
#   - `make MODE=dbg`
#   - Backtraces
#   - Enables asan
#   - Enables ubsan (TODO)
#   - Stack canaries
#   - No optimization (TODO)
#   - Enormous binaries
#
ifeq ($(MODE), dbg)
CONFIG_CPPFLAGS += -DMODE_DBG
CONFIG_CCFLAGS += $(BACKTRACES) $(FTRACE) -DSYSDEBUG -O -fno-inline
CONFIG_COPTS += -fsanitize=address -fsanitize=undefined
TARGET_ARCH ?= -msse3
OVERRIDE_CCFLAGS += -fno-pie
endif

# System Five Mode
#
#   - `make MODE=sysv`
#   - Optimized
#   - Backtraces
#   - Debuggable
#   - Syscall tracing
#   - Function tracing
#   - No Windows bloat!
#
ifeq ($(MODE), sysv)
CONFIG_CCFLAGS += $(BACKTRACES) $(FTRACE) -O2
CONFIG_CPPFLAGS += -DSYSDEBUG -DSUPPORT_VECTOR=121
TARGET_ARCH ?= -msse3
endif

# Tiny Mode
#
#   - `make MODE=tiny`
#   - No checks
#   - No asserts
#   - No canaries
#   - No paranoia
#   - No avx hooks
#   - No backtraces
#   - No algorithmics
#   - YOLO
#
ifeq ($(MODE), tiny)
CONFIG_CPPFLAGS +=			\
	-DTINY				\
	-DNDEBUG			\
	-DTRUSTWORTHY
CONFIG_CCFLAGS +=			\
	-Os				\
	-fno-align-functions		\
	-fno-align-jumps		\
	-fno-align-labels		\
	-fno-align-loops		\
	-fschedule-insns2		\
	-fomit-frame-pointer		\
	-momit-leaf-frame-pointer	\
	-foptimize-sibling-calls	\
	-DDWARFLESS
CONFIG_OFLAGS +=			\
	-g0
CONFIG_LDFLAGS +=			\
	-S
TARGET_ARCH ?=				\
	-msse3
PYFLAGS +=				\
	-O2				\
	-B
endif

# Linux-Only Tiny Mode
#
#   - `make MODE=tinylinux`
#   - No checks
#   - No asserts
#   - No canaries
#   - No paranoia
#   - No avx hooks
#   - No backtraces
#   - No portability
#   - No algorithmics
#   - YOLO
#
ifeq ($(MODE), tinylinux)
CONFIG_CPPFLAGS +=			\
	-DTINY				\
	-DNDEBUG			\
	-DTRUSTWORTHY			\
	-DSUPPORT_VECTOR=1		\
	-DDWARFLESS
DEFAULT_COPTS +=			\
	-mred-zone
CONFIG_OFLAGS +=			\
	-g0
CONFIG_LDFLAGS +=			\
	-S
CONFIG_CCFLAGS +=			\
	-Os				\
	-fno-align-functions		\
	-fno-align-jumps		\
	-fno-align-labels		\
	-fno-align-loops
TARGET_ARCH ?=				\
	-msse3
endif

# Linux+BSD Tiny Mode
#
#   - `make MODE=tinylinuxbsd`
#   - No apple
#   - No checks
#   - No asserts
#   - No canaries
#   - No paranoia
#   - No microsoft
#   - No avx hooks
#   - No backtraces
#   - No algorithmics
#   - YOLO
#
ifeq ($(MODE), tinylinuxbsd)
CONFIG_CPPFLAGS +=		\
	-DTINY			\
	-DNDEBUG		\
	-DTRUSTWORTHY		\
	-DSUPPORT_VECTOR=113	\
	-DDWARFLESS
DEFAULT_COPTS +=		\
	-mred-zone
CONFIG_OFLAGS +=		\
	-g0
CONFIG_LDFLAGS +=		\
	-S
CONFIG_CCFLAGS +=		\
	-Os			\
	-fno-align-functions	\
	-fno-align-jumps	\
	-fno-align-labels	\
	-fno-align-loops
TARGET_ARCH ?=			\
	-msse3
endif

# Unix Tiny Mode
#
#   - `make MODE=tinysysv`
#   - No checks
#   - No asserts
#   - No canaries
#   - No paranoia
#   - No microsoft
#   - No avx hooks
#   - No backtraces
#   - No algorithmics
#   - YOLO
#
ifeq ($(MODE), tinysysv)
CONFIG_CPPFLAGS +=		\
	-DTINY			\
	-DNDEBUG		\
	-DTRUSTWORTHY		\
	-DSUPPORT_VECTOR=121	\
	-DDWARFLESS
DEFAULT_COPTS +=		\
	-mred-zone
CONFIG_CCFLAGS +=		\
	-Os			\
	-fno-align-functions	\
	-fno-align-jumps	\
	-fno-align-labels	\
	-fno-align-loops
CONFIG_OFLAGS +=		\
	-g0
CONFIG_LDFLAGS +=		\
	-S
TARGET_ARCH ?=			\
	-msse3
endif

# Tiny Metallic Unix Mode
#
#   - `make MODE=tinynowin`
#   - No checks
#   - No asserts
#   - No canaries
#   - No paranoia
#   - No microsoft
#   - No avx hooks
#   - No backtraces
#   - No algorithmics
#   - YOLO
#
ifeq ($(MODE), tinynowin)
CONFIG_CPPFLAGS +=		\
	-DTINY			\
	-DNDEBUG		\
	-DTRUSTWORTHY		\
	-DSUPPORT_VECTOR=251	\
	-DDWARFLESS
CONFIG_CCFLAGS +=		\
	-Os			\
	-fno-align-functions	\
	-fno-align-jumps	\
	-fno-align-labels	\
	-fno-align-loops
CONFIG_OFLAGS +=		\
	-g0
CONFIG_LDFLAGS +=		\
	-S
TARGET_ARCH ?=			\
	-msse3
endif

# GCC11 Mode
# https://justine.lol/compilers/x86_64-linux-musl__x86_64-linux-musl__g++-11.2.0.tar.xz
ifeq ($(MODE), gcc11)
.UNVEIL += rx:/opt/gcc11
CONFIG_CCFLAGS += $(BACKTRACES) $(FTRACE) -DSYSDEBUG -O2
AS = /opt/gcc11/bin/x86_64-linux-musl-as
CC = /opt/gcc11/bin/x86_64-linux-musl-gcc
CXX = /opt/gcc11/bin/x86_64-linux-musl-g++
CXXFILT = /opt/gcc11/bin/x86_64-linux-musl-c++filt
LD = /opt/gcc11/bin/x86_64-linux-musl-ld.bfd
NM = /opt/gcc11/bin/x86_64-linux-musl-nm
GCC = /opt/gcc11/bin/x86_64-linux-musl-gcc
STRIP = /opt/gcc11/bin/x86_64-linux-musl-strip
OBJCOPY = /opt/gcc11/bin/x86_64-linux-musl-objcopy
OBJDUMP = /opt/gcc11/bin/x86_64-linux-musl-objdump
ADDR2LINE = /opt/gcc11/bin/x86_64-linux-musl-addr2line
CONFIG_CCFLAGS += $(BACKTRACES) $(FTRACE) -O2 -Wno-stringop-overread
CONFIG_CFLAGS += -Wno-old-style-definition
CONFIG_CPPFLAGS += -DNDEBUG -DSYSDEBUG
TARGET_ARCH ?= -msse3
endif

# LLVM Mode
ifeq ($(MODE), llvm)
TARGET_ARCH ?= -msse3
CONFIG_CCFLAGS += $(BACKTRACES) $(FTRACE) -DSYSDEBUG -O2
AS = clang
CC = clang
CXX = clang++
CXXFILT = llvm-c++filt
LD = ld.lld
NM = llvm-nm
GCC = clang
STRIP = llvm-strip
OBJCOPY = llvm-objcopy
OBJDUMP = llvm-objdump
ADDR2LINE = llvm-addr2line
endif

# ANSI Mode
#
# These flags cause GCC to predefine __STRICT_ANSI__. Please be warned
# that Cosmopolitan headers are written to comply with that request if
# it's possible to do so. Consider the following example:
#
#   make -j12 -O o//tool/viz/printvideo.i
#   clang-format-10 -i o//tool/viz/printvideo.i
#   less o//tool/viz/printvideo.i
#
# You'll notice functions like memcpy(), ioctl(), etc. get expanded into
# wild-eyed gnu-style performance hacks. You can turn it off as follows:
#
#   make -j12 -O MODE=ansi o/ansi/tool/viz/printvideo.i
#   clang-format-10 -i o/ansi/tool/viz/printvideo.i
#   less o/ansi/tool/viz/printvideo.i
#
# Here it becomes clear that ANSI mode can help you decouple your source
# from Cosmopolitan, by turning it into plain ordinary textbook C code.
#
# Another potential use case is distributing code to folks using tools
# such as MSVC or XCode. You can run your binary objects through a tool
# like objconv to convert them to COFF or MachO. Then use ANSI mode to
# rollup one header file that'll enable linkage with minimal issues.

ifeq ($(MODE), ansi)

CONFIG_CFLAGS += -std=c11
#CONFIG_CPPFLAGS += -ansi
CONFIG_CXXFLAGS += -std=c++11
TARGET_ARCH ?= -msse3

endif