# Copyright 2017, pEp Foundation
# This file is part of pEpEngine
# This file may be used under the terms of the GNU General Public License version 3
# see LICENSE.txt

# See `doc/build-<your platform>.md` for documentation on how to build, and customize your build.

# This file sets all the make variables that allow you to customize a build.
# There are 3 ways in which you can customize your build:
# 1) Edit the variable assignments in this file (this is a tracked file, so your repository will be dirty)
# 2) Create `local.conf` and fill it with variable assignments.
# 3) Set the environment variable `BUILD_CONFIG` to an absolute path.
#    The variable assignments found in the make file at the path indicated by `BUILD_CONFIG` will be evaluated.
# Customization options are applied in the order given above. Later variable assignments take precedence over earlier ones.
# It is possible to use multiple variants simultaniously.
# If nothing is changed according to these 3 methods, a default configuration for your platform (specified below) will be used for the build.

######### Header #########
HERE:=$(dir $(lastword $(MAKEFILE_LIST)))


######### General #########
# To use (only) system libraries, set all the *_INC and *_LIB variables to the empty string.
# All the *_INC and *_LIB variables are command line flags, not paths.
# Thus, all *_INC variables' values must start with "-I", and all *_LIB variables' values must start with "-L".

BUILD_ON:=$(shell uname)

# This variable specifies the platform that the engine should be cross-compiled for.
BUILD_FOR=$(BUILD_ON)

# Cross-compiling is currently not supported.
# Maybe you can hack something with `local.conf`.
ifneq ($(BUILD_ON),$(BUILD_FOR))
    ifeq ($(BUILD_FOR),OS/390)
        $(warning Generating sources for z/OS)
    endif
    ONLY_GENERATE=true
endif

# Installation path prefix for libraries and binaries, except for system.db
PREFIX=$(HOME)

# pEp files and directories
#
# the PER_USER_DIRECTORY will be in $(HOME), respectively
# in debug builds the PER_USER_DIRECTORY will be in $(PEP_HOME) instead if set
#
# PER_MACHINE_DIRECTORY is calculated depending on platform; overwrite if
# necessary

#PER_USER_DIRECTORY=.pEp
PER_MACHINE_DIRECTORY=/usr/local/share/pEp

# Filename of the pEpEngine library
ifeq ($(BUILD_FOR),OS/390)
    TARGET=libpEpEngine.so
else ifeq ($(BUILD_FOR),Linux)
    TARGET=libpEpEngine.so
else ifeq ($(BUILD_FOR),Darwin)
    TARGET=libpEpEngine.dylib
endif

# If empty, create a release build.
# Otherwise, create a debug build.
# This variable is ineffective when set anywhere else but here.
DEBUG=placeholder

# If empty, suppress compiler warnings.
# Otherwise, print warnings.
# This variable is ineffective when set anywhere else but here.
WARN=placeholder


######### C and C++ #########
TARGET_ARCH=

# The following two variables will be appended to.
# You can thus not set them to a final, fixed value here.
ifeq ($(BUILD_FOR),Linux)
    LDFLAGS+=
else ifeq ($(BUILD_FOR),Darwin)
    # "-bind_at_load" helps find symbol resolution errors faster
    LDFLAGS+=-bind_at_load
endif

# Are we wiping this on purpose?
LDLIBS=

# Define compiler.
ifeq ($(BUILD_FOR),OS/390)
    CC=xlclang
else ifeq ($(BUILD_FOR),Linux)
    CC=gcc -std=c99 -pthread
else ifeq ($(BUILD_FOR),Darwin)
    CC=clang 
endif

# Add platform-specific compilation options.
ifeq ($(BUILD_FOR),OS/390)
    CFLAGS= -Wno-gnu-include-next -qnosearch -I$(HERE) -I.
    CFLAGS+= -I/usr/include
    CFLAGS+= -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112L -qlanglvl=NOLIBEXT
else ifeq ($(BUILD_FOR),Linux)
    CFLAGS+=-fPIC -fstrict-aliasing -fdiagnostics-color=auto
else ifeq ($(BUILD_FOR),Darwin)
    CFLAGS+=-pthread -fPIC -fstrict-aliasing -fcolor-diagnostics
endif

# The flag -DNDEBUG will always be removed from CFLAGS for compiling tests.
# The tests do not work properly, if compiled with -DNDEBUG
ifeq ($(BUILD_FOR),OS/390)
    ifdef WARN
        CFLAGS+= -Wall -pedantic
    else
        CFLAGS+= -w
    endif
    ifdef DEBUG
        CFLAGS+= -g -DDEBUG_ERRORSTACK
    else
        CFLAGS+= -O3 -DNDEBUG
    endif
else ifeq ($(BUILD_FOR),Linux)
    ifdef WARN
        CFLAGS+= -Wall -pedantic -Wstrict-aliasing=3
    else
        CFLAGS+= -w
    endif
    ifdef DEBUG
        CFLAGS+= -g -ggdb -DDEBUG_ERRORSTACK
    else
        CFLAGS+= -O3 -DNDEBUG
    endif
else ifeq ($(BUILD_FOR),Darwin)
    ifdef WARN
        CFLAGS+= -Wall -pedantic
    else
        CFLAGS+= -w
    endif
    ifdef DEBUG
        CFLAGS+= -O0 -g -DDEBUG_ERRORSTACK
    else
        CFLAGS+= -O3 -DNDEBUG
    endif
endif

# Additional CFLAGS used for compiling ASN1C-generated code
ifeq ($(BUILD_FOR),Linux)
    # The '_DEFAULT_SOURCE' feature test macro is required to suppress the warning
    #   _BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE
    # otherwise printed during the compilation of every asn1c-generated C file.
    # It's a glibc specific warning, only present in few versions around ~2.19.
    # See https://lwn.net/Articles/590381/ for a discussion.
    CPPFLAGS_GENERATED=-D_DEFAULT_SOURCE
else ifeq ($(BUILD_FOR),Darwin)
    CPPFLAGS_GENERATED=
endif


######### C++ #########
ifeq ($(BUILD_FOR),Linux)
    CXX=g++ 
    CXXFLAGS+=-std=gnu++11
else ifeq ($(BUILD_FOR),Darwin)
    # clang issues a warning when "-pthread" is used for linking. So, include it in CXXFLAGS, and not in CXX
    CXX=clang -std=c++11
else ifeq ($(BUILD_FOR),OS/390)
    CXX=xlclang++ -std=c++11
endif

ifneq ($(BUILD_FOR),OS/390)
CXXFLAGS+=-pthread
endif

# The flag -DNDEBUG will always be removed from CPPFLAGS for compiling tests.
#
# The tests do not work properly, if compiled with -DNDEBUG
ifeq ($(BUILD_FOR),OS/390)
    CXXFLAGS+= -fdiagnostics-color=auto -Wno-gnu-include-next
    CXXFLAGS+= -qnosearch -I$(HERE) -I.  -I../src -I../asn.1 $(ETPAN_INC) -I/usr/lpp/java/J8.0_64/include -I/usr/include
    CXXFLAGS+= -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112L
    ifdef WARN
        CXXFLAGS+=
    else
        CXXFLAGS+= -w
    endif
    ifdef DEBUG
        CXXFLAGS+= -g
    else
        CXXFLAGS+= -O3 -DNDEBUG
    endif
else ifeq ($(BUILD_FOR),Linux)
    CXXFLAGS+=-fdiagnostics-color=auto -I../src -I../asn.1 $(ETPAN_INC)
    ifdef WARN
        CXXFLAGS+=
    else
        CXXFLAGS+= -w
    endif
    ifdef DEBUG
        CXXFLAGS+= -g -ggdb
    else
        CXXFLAGS+= -O3 
        CPPFLAGS+= -DNDEBUG
    endif
else ifeq ($(BUILD_FOR),Darwin)
    CXXFLAGS+=-pthread -fcolor-diagnostics -I../src -I../asn.1 $(ETPAN_INC)
    ifdef WARN
        CXXFLAGS+=
    else
        CXXFLAGS+= -w
    endif
    ifdef DEBUG
        CXXFLAGS+= -O0 -g
    else
        CXXFLAGS+= -O3 
        CPPFLAGS+= -DNDEBUG
    endif
endif


######### C and C++ #########
ifeq ($(BUILD_FOR),OS/390)
    CPPFLAGS+=-W "l,xplink,dll" -W "c,float(ieee),xplink,dll,exportall"
else ifeq ($(BUILD_FOR),Darwin)
    CPPFLAGS+=-D_DARWIN_C_SOURCE
else
    LDLIBS+=-luuid
endif



######### YML2 #########
YML2_PATH=$(HOME)/yml2

YML2_PROC=$(YML2_PATH)/yml2proc $(YML2_OPTS)

YML2_OPTS=--encoding=utf8


######### asn1c #########
# asn1c binary
ASN1C=asn1c

# asn1c include search flag
ASN1C_INC=
#ASN1C_INC=-I$(HOME)/include


######### sqlite3 #########
# If empty (or undefined), compile sqlite3 from the sources shipped with the pEp distribution.
# Otherwise, use an sqlite3 implementation found in the OS's include/library paths.
SQLITE3_FROM_OS=placeholder


######### MIME #########

######### pEp MIME #########
# Set pEpMIME= anything (there are ifdefs on it) in your local.conf if you want
# to compile built-in pEpMIME (requires a separate libppEpMIME source repo to be
# checked out elsewhere on the system - define or redefine these in local.conf
# if you want to use it; otherwise, we default to etpan. (This will eventually
# become the default, but not yet.
#
PEP_MIME=
PEP_MIME_SRC=$(HOME)/src/pEpMIME/src


######### libetpan #########
# libetpan library search flag
#
ETPAN_LIB=
#ETPAN_LIB=-L$(HOME)/lib

# libetpan include search flag
ETPAN_INC=
#ETPAN_INC=-I$(HOME)/include

######### OpenPGP #########
# Selects OpenPGP implementation. must be `SEQUOIA`
ifeq ($(BUILD_FOR),OS/390)
OPENPGP=NETPGP
else
OPENPGP=SEQUOIA
endif

# Sequoia-specific variables
SEQUOIA_CFLAGS+=
SEQUOIA_LDFLAGS+=
SEQUOIA_LIB=
SEQUOIA_INC=

######### Engine internals #########
# C macros (not environment variables) that can be overridden:
# DEFAULT_KEYSERVER - string with default keyserver
# CRASHDUMP_DEFAULT_LINES - number of log lines to deliver for crashdumps
# Example:
#    EXTRA_MACROS=-DDEFAULT_KEYSERVER=\"default-server.org\" -DCRASHDUMP_DEFAULT_LINES=23
EXTRA_MACROS=

# Notice the single quotes below: since user definitions can contain dollar
# signs it is important to prevent their expansion: shell variable references
# here must be expanded at run time, and not at compile time.
ifdef PER_USER_DIRECTORY
       EXTRA_MACROS+= -DPER_USER_DIRECTORY='"$(PER_USER_DIRECTORY)"'
endif
ifdef PER_MACHINE_DIRECTORY
       EXTRA_MACROS+= -DPER_MACHINE_DIRECTORY='"$(PER_MACHINE_DIRECTORY)"'
endif

CFLAGS+=$(EXTRA_MACROS)
CXXFLAGS+=$(EXTRA_MACROS)

######### Misc #########
# FIXME Maybe include these variables here.
# Check how they are used throughout the project before setting them here
#LLDB_BIN

# Add this for running tests in debugger
#TEST_DEBUGGER=lldb --batch -o r

# comma-separated list of tests to exclude from gensuite (relevant for running tests only)
EXCLUDE=


######### Footer #########

################################
# Include local.conf for any overrides and additional flags
################################
-include $(HERE)/local.conf

ifdef BUILD_CONFIG
    include $(BUILD_CONFIG)
endif

######### Post processing assignments ########

# If sequoia has been set up and the SEQUOIA flags aren't defined, set them up.
# Otherwise, add them to the CFLAGS/CXXFLAGS/LDFLAGS and library/include variables
ifeq ($(OPENPGP),SEQUOIA)
ifeq ($(SEQUOIA_CFLAGS),)
    SEQUOIA_CFLAGS+=$(shell pkg-config --cflags-only-other sequoia-openpgp)
endif
ifeq ($(SEQUOIA_LDFLAGS),)
    SEQUOIA_LDFLAGS+=$(shell pkg-config --libs-only-l sequoia-openpgp)
endif
ifeq ($(SEQUOIA_LIB),)
    SEQUOIA_LIB=$(shell pkg-config --libs-only-L --libs-only-other sequoia-openpgp)
endif
ifeq ($(SEQUOIA_INC),)
    SEQUOIA_INC=$(shell pkg-config --cflags-only-I sequoia-openpgp)
endif
    CFLAGS+= $(SEQUOIA_CFLAGS)
    CXXFLAGS+= $(SEQUOIA_CFLAGS)
    LD_FLAGS+= $(SEQUOIA_LDFLAGS)
endif

# YML_PATH is needed in the environment of every call to a program of the YML2 distribution
export YML_PATH=$(YML2_PATH)

# Postprocess for pEpMIME
ifdef PEP_MIME
    # Replace c++11 with c++14 for now (limiting the subst to the ++11 means it doesn't matter if gnu or not)
    CXXFLAGS:=$(subst ++11,++14,$(CXXFLAGS)) -fPIC -fvisibility=hidden
endif
ifdef PEP_MIME
ifndef PEP_MIME_SRC
    $(error "Compiling with the PEP_MIME option set requires the value of PEP_MIME_SRC to be set to the source directory for libpEpMIME")
else
    CPPFLAGS+=-DPEP_BUILTIN_MIME
ifneq ($(BUILD_ON),OS/390)
    LDLIBS+=-lstdc++
endif
    ETPAN_LIB=
    ETPAN_INC=
endif
endif