#!/usr/bin/make -f
# -*- makefile -*-
# Build gcc-mingw-w64 using gcc-14-source.
# Copyright © 2010-2024 Stephen Kitt <skitt@debian.org>
# Copyright © 2022-2024 Konstantin Demin <rockdrilla@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

ifeq (,$(filter terse,$(DEB_BUILD_OPTIONS)))
export DH_VERBOSE := 1
endif

# Disable package mangling in Launchpad; it currently fails to parse
# Built-Using, which results in build failures
export NO_PKG_MANGLE=1

target_version := 14
target32 := i686-w64-mingw32
target64 := x86_64-w64-mingw32
targetucrt := x86_64-w64-mingw32ucrt
targets := $(target32) $(target64)
threads := posix win32
gnat_arches := alpha amd64 arm64 armel armhf hppa i386 mips64el mipsel ppc64 ppc64el riscv64 s390x sh4 sparc64 x32

include /usr/share/dpkg/pkg-info.mk
include /usr/share/dpkg/architecture.mk

top_dir := $(shell pwd)
gcc_dir := /usr/src/gcc-$(target_version)
upstream_dir := $(top_dir)/src
build_dir := $(top_dir)/build
stampdir := $(top_dir)/stamps
source_version := $(shell dpkg-query -W -f='$${Version}' gcc-$(target_version)-source)
deb_version := $(source_version)+$(DEB_VERSION)
deb_upstream_version := $(word 1,$(subst -, ,$(source_version)))
base_version := $(target_version)
export deb_upstream_version

# Languages to build (full build only)
languages := c,c++,fortran,objc,obj-c++
# Disable ADA for now, it only builds with a matching gnat
# as default gnat version (currently that’s 13, we need 14).
#ifneq (,$(filter $(DEB_HOST_ARCH),$(gnat_arches)))
#languages := $(languages),ada
#endif

%:
	dh $@

comma := ,
debian/control: $(wildcard debian/control.*) debian/rules
	echo \# This file is generated using debian/rules control, do not edit > $@
	cat debian/control.source >> $@
	echo >> $@
	cat debian/control.bootstrap >> $@
	for language in $(subst $(comma), ,$(languages)); do \
		echo >> $@; \
		sed -f debian/control.$$language.sed debian/control.template >> $@; \
	done
	echo >> $@
	cat debian/control.ucrt64-runtime >> $@
	echo >> $@
	cat debian/control.base >> $@
	sed -i '/^Recommends: $$/d' $@
	sed -i '/^Breaks: $$/d' $@
	sed -i '/^Conflicts: $$/d' $@
	sed -i '/^Replaces: $$/d' $@
	sed -i 's/@@VERSION@@/$(target_version)/g' $@
ifeq (,$(gnat_arches))
	sed -i '/@@GNAT_ARCHES@@/d' $@
else
	sed -i 's/@@GNAT_ARCHES@@/$(gnat_arches)/' $@
endif
	sed -i 's/, $$/,/' $@

# Hardening on the host, none on the target
# Format fails the build currently; using PIE produces a compiler
# which can't build with pre-compiled headers
dpkg_buildflags_host = DEB_BUILD_MAINT_OPTIONS="hardening=+all,-format,-pie" dpkg-buildflags
dpkg_buildflags_target = DEB_BUILD_MAINT_OPTIONS="hardening=-all qa=-bug-implicit-func" dpkg-buildflags

ifeq (,$(filter stage1,$(DEB_BUILD_PROFILES)))
CC = gcc-$(target_version)
CXX = g++-$(target_version)
endif
export CC CXX

BUILDFLAGS = CFLAGS CPPFLAGS CXXFLAGS FCFLAGS FFLAGS LDFLAGS
export $(BUILDFLAGS) $(patsubst %,%_FOR_TARGET,$(BUILDFLAGS))
$(foreach flag,$(BUILDFLAGS),$(eval $(flag) = $(shell $(dpkg_buildflags_host) --get $(flag))))
$(foreach flag,$(BUILDFLAGS),$(eval $(flag)_FOR_TARGET = $(shell $(dpkg_buildflags_target) --get $(flag))))
CFLAGS += -Wall
CFLAGS_FOR_TARGET += -Wall
CXXFLAGS += -Wall
CXXFLAGS_FOR_TARGET += -Wall
LDFLAGS_FOR_TARGET += -Wl,--as-needed

# libgfortran doesn't handle FCFLAGS_FOR_TARGET, override FCFLAGS
FCFLAGS = $(shell $(dpkg_buildflags_target) --get FCFLAGS)

# Number of jobs to run for build
ifeq (no,$(USE_NJOBS))
  NJOBS :=
  USE_CPUS := 1
else
  # Increase to 192 if building Java
  MEM_PER_CPU = 128
  NUM_CPUS := $(shell if echo $(USE_NJOBS) | grep -q -E '^[0-9]+$$'; \
                        then echo $(USE_NJOBS); \
                        else getconf _NPROCESSORS_ONLN 2>/dev/null || echo 1; fi)
  USE_CPUS := $(shell mt=`awk '/^MemTotal/ { print $$2 }' /proc/meminfo`; \
                        awk -vn=$(NUM_CPUS) -vmt=$$mt -vm=$(MEM_PER_CPU) \
                                'END { mt/=1024; n2 = int(mt/m); print n==1 ? 1 : n2<n+1 ? n2 : n+1}' < /dev/null)
  ifneq (,$(strip $(USE_CPUS)))
    NJOBS := -j $(USE_CPUS)
  endif
endif

# Support parallel=<n> in DEB_BUILD_OPTIONS (see #209008)
ifneq (,$(filter parallel=%,$(subst $(COMMA), ,$(DEB_BUILD_OPTIONS))))
  NJOBS := -j $(subst parallel=,,$(filter parallel=%,$(subst $(COMMA), ,$(DEB_BUILD_OPTIONS))))
endif

# Patch targets
patchdir = $(gcc_dir)/debian/patches
series_file = series
unpack_stamp = $(stampdir)/unpack
patch_stamp = $(stampdir)/patch
GFDL_INVARIANT_FREE=yes
srcdir=$(upstream_dir)
include $(gcc_dir)/debian/rules.patch

unpack: $(unpack_stamp)
$(unpack_stamp):
	tar xf $(gcc_dir)/gcc-*.tar.*
	rm -rf $(upstream_dir)
	mv gcc-* $(upstream_dir)
# Apply our first series of patches (those which need to be applied
# before gcc-?-source’s)
	QUILT_SERIES=debian/patches/series1 QUILT_PATCHES=debian/patches quilt push -a
# Drop the quilt cache so we can process other series
	rm -rf .pc
	mkdir -p $(stampdir)
# gcov-dump.texi is missing in some source tarballs
	if [ ! -f $(upstream_dir)/gcc/doc/gcov-dump.texi ]; then cp $(gcc_dir)/debian/dummy.texi $(upstream_dir)/gcc/doc/gcov-dump.texi; fi
	touch $@

execute_before_dh_clean: debian/control
	rm -rf $(stampdir) $(build_dir) $(upstream_dir) .pc autotools_files series *-stamp
	rm -f $(patsubst %.in,%,$(wildcard debian/*.in))

# Configuration constructed as in the gcc package
PF=usr
libdir=lib
libexecdir=$(PF)/$(libdir)

# Standard Debian configuration flags
CONFFLAGS = \
	--prefix=/$(PF) \
	--enable-shared \
	--enable-static \
	--disable-multilib \
	--with-system-zlib \
	--libexecdir=/$(libexecdir) \
	--without-included-gettext \
	--libdir=/$(PF)/$(libdir) \
	--enable-libstdcxx-time=yes \
	--with-tune=generic
# Tell GCC we have headers (this enables gcov)
CONFFLAGS += \
	--with-headers
# MinGW-w64 flags
# version-specific-runtime-libs puts target-specific libraries in
# /usr/lib/gcc rather than /usr/$(target)
CONFFLAGS += \
	--enable-version-specific-runtime-libs \
	--enable-fully-dynamic-string \
	--enable-libgomp
# Target-dependent
CONFFLAGS += \
	--program-prefix=$$target- \
	--target=$$target \
	--with-as=/usr/bin/$$target-as \
	--with-ld=/usr/bin/$$target-ld
# Enable libatomic
CONFFLAGS += \
	--enable-libatomic
# Enable experimental::filesystem and std::filesystem
CONFFLAGS += \
	--enable-libstdcxx-filesystem-ts=yes
# Enable dependency tracking (disabled by dh; see
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55930 for details)
CONFFLAGS += \
	--enable-dependency-tracking
# Use the most compatible path for sed (e.g. non-usrmerge).
CONFFLAGS += \
	SED=/bin/sed

# BOOTFLAGS are used for the bootstrap build, FULLFLAGS for the full build
BOOTFLAGS += \
	--enable-languages=c,c++
FULLFLAGS += \
	--enable-languages=$(languages)
# Thread-model-dependent
THREADFLAGS += \
	--enable-threads=$$threads \
	--program-suffix=-$$threads
UCRTFLAGS += \
	--enable-threads=posix
# LTO
BOOTFLAGS += \
	--disable-lto
FULLFLAGS += \
	--enable-lto

# FLAGS32 are 32-bit-specific, FLAGS64 64-bit-specific
# For 32-bit targets, force Dwarf2 exception handling
FLAGS32 += \
	--disable-sjlj-exceptions --with-dwarf2

spelling = echo "--- Fix spelling of \"$(1)\" -> \"$(2)\"" >&2 ; find $(upstream_dir)/ -type f -exec grep -FZl -e "$(1)" {} + | xargs -0t sed -i "s/$(1)/$(2)/g" || echo "--- The above fix is no longer necessary"

# Patches applied or unapplied after the upstream sources have been
# unpacked and patched using the gcc-?-source package's patches
mingw-w64-patch: mingw-w64-patch-stamp
mingw-w64-patch-stamp: $(patch_stamp)
# Apply our second series of patches
	rm -rf .pc
	QUILT_SERIES=debian/patches/series2 QUILT_PATCHES=debian/patches quilt push -a
# Spelling fixes
	$(call spelling,Allow to,Allow one to)
	$(call spelling,Var befor:,Var before:)
	$(call spelling,eroneous,erroneous)
	$(call spelling,identifer,identifier)
	$(call spelling,informations,information)
	$(call spelling,interchage,interchange)
	$(call spelling,intial,initial)
	$(call spelling,intrument,instrument)
	$(call spelling,mininum,minimum)
	$(call spelling,mutiple,multiple)
	$(call spelling,occurence,occurrence)
	$(call spelling,refrence,reference)
	$(call spelling,should't,shouldn't)
	$(call spelling,splitted,split)
	$(call spelling,Staticly,Statically)
	$(call spelling,temorary,temporary)
	$(call spelling,suported,supported)
	$(call spelling,wihout,without)
# Force /bin/sh in mkheaders
	sed -i sX@SHELL@X/bin/shX $(upstream_dir)/fixincludes/mkheaders.in
# Fix the date and time of patched files
	find . -type f -a -newermt '@$(SOURCE_DATE_EPOCH)' \
		-exec touch --no-dereference --date='@$(SOURCE_DATE_EPOCH)' {} +
	touch $@

# 32- and 64-bit targets are split: 32-bit uses Dwarf2, 64-bit the default SEH
override_dh_auto_configure: debian/control mingw-w64-patch-stamp
	set -e; \
	cp $(upstream_dir)/gcc/BASE-VER.orig $(upstream_dir)/gcc/BASE-VER || \
	cp $(upstream_dir)/gcc/BASE-VER $(upstream_dir)/gcc/BASE-VER.orig; \
	touch -r $(top_dir)/debian/changelog $(upstream_dir)/gcc/BASE-VER; \
	mkdir -p $(build_dir)/$(target32)-bootstrap $(build_dir)/$(target64)-bootstrap $(build_dir)/$(targetucrt)-bootstrap; \
	target=$(target32); \
	cd $(build_dir)/$(target32)-bootstrap && $(upstream_dir)/configure \
		$(CONFFLAGS) $(BOOTFLAGS) $(FLAGS32); \
	for target in $(target64) $(targetucrt); do \
	cd $(build_dir)/$${target}-bootstrap && $(upstream_dir)/configure \
		$(CONFFLAGS) $(BOOTFLAGS) $(FLAGS64); \
	done
ifeq (,$(filter stage1,$(DEB_BUILD_PROFILES)))
# For UCRT we only build with POSIX threads (see Fedora and MSYS2)
	echo $(base_version) > $(upstream_dir)/gcc/BASE-VER; \
	touch -r $(top_dir)/debian/changelog $(upstream_dir)/gcc/BASE-VER; \
	target=$(targetucrt); \
	mkdir -p $(build_dir)/$${target} && \
	cd $(build_dir)/$${target} && $(upstream_dir)/configure \
		$(CONFFLAGS) $(FULLFLAGS) $(UCRTFLAGS) $(FLAGS64)
endif

override_dh_auto_build-arch:
	set -e; \
	cp $(upstream_dir)/gcc/BASE-VER.orig $(upstream_dir)/gcc/BASE-VER; \
	touch -r $(top_dir)/debian/changelog $(upstream_dir)/gcc/BASE-VER; \
	for target in $(targets) $(targetucrt); do \
		cd $(build_dir)/$$target-bootstrap && \
		$(MAKE) $(NJOBS) all-gcc; \
	done
ifeq (,$(filter stage1,$(DEB_BUILD_PROFILES)))
	target=$(targetucrt); \
	echo $(base_version) > $(upstream_dir)/gcc/BASE-VER && \
	touch -r $(top_dir)/debian/changelog $(upstream_dir)/gcc/BASE-VER && \
	cd $(build_dir)/$$target && \
	$(MAKE) $(NJOBS)
endif

override_dh_auto_build-indep:

override_dh_auto_install-arch:
# Base installation, move misplaced DLLs and libraries
	set -e; \
	destdir=$(top_dir)/debian/gcc-mingw-w64-bootstrap && \
	cp $(upstream_dir)/gcc/BASE-VER.orig $(upstream_dir)/gcc/BASE-VER; \
	touch -r $(top_dir)/debian/changelog $(upstream_dir)/gcc/BASE-VER; \
	for target in $(targets) $(targetucrt); do \
		cd $(build_dir)/$$target-bootstrap && \
		$(MAKE) DESTDIR=$$destdir install-gcc; \
		if [ -f $$destdir/usr/lib/gcc/$$target/lib/*.a ]; then \
			mv $$destdir/usr/lib/gcc/$$target/lib/*.a $$destdir/usr/lib/gcc/$$target/$(base_version)/; \
		fi; \
		if [ -f $$destdir/usr/lib/gcc/$$target/*.dll ]; then \
			mv $$destdir/usr/lib/gcc/$$target/*.dll $$destdir/usr/lib/gcc/$$target/$(base_version)/; \
		fi; \
		cd $(build_dir) && rm -rf $$target-bootstrap; \
	done; \
	rm -rf $$destdir/usr/include $$destdir/usr/share
ifeq (,$(filter stage1,$(DEB_BUILD_PROFILES)))
	target=$(targetucrt); \
	echo $(base_version) > $(upstream_dir)/gcc/BASE-VER && \
	touch -r $(top_dir)/debian/changelog $(upstream_dir)/gcc/BASE-VER && \
	cd $(build_dir)/$$target && \
	$(MAKE) DESTDIR=$(top_dir)/debian/tmp install install-lto-plugin; \
	if [ -f $(top_dir)/debian/tmp/usr/lib/gcc/$$target/lib/*.a ]; then \
		mv $(top_dir)/debian/tmp/usr/lib/gcc/$$target/lib/*.a $(top_dir)/debian/tmp/usr/lib/gcc/$$target/$(base_version)/; \
	fi; \
	if [ -f $(top_dir)/debian/tmp/usr/lib/gcc/$$target/*.dll ]; then \
		mv $(top_dir)/debian/tmp/usr/lib/gcc/$$target/*.dll $(top_dir)/debian/tmp/usr/lib/gcc/$$target/$(base_version)/; \
	fi; \
	cd $(build_dir) && rm -rf $$target

# Remove files which conflict with other packages
# gcc-$(target_version)-locales
	rm -rf $(top_dir)/debian/tmp/usr/share/locale
# binutils-dev
	rm -f $(top_dir)/debian/tmp/usr/lib/libiberty.a
# libstdc++6-$(target_version)-dbg (potentially)
	rm -rf $(top_dir)/debian/tmp/usr/share/gcc/python
# -doc packages
	rm -rf $(top_dir)/debian/tmp/usr/share/info
	rm -rf $(top_dir)/debian/tmp/usr/share/man/man7
# libcc1-0
	rm -f $(top_dir)/debian/tmp/usr/lib/libcc1*

# No need to ship empty manpages
	rm -rf $(top_dir)/debian/tmp/usr/share/man/man1

# Drop .la files
	find $(top_dir)/debian/tmp/ -name \*.la -delete

	for i in 1 2; do \
		find $(top_dir)/debian/tmp/ -type d -empty -delete; \
	done

endif

override_dh_installchangelogs:
	dh_installchangelogs $(upstream_dir)/ChangeLog

override_dh_gencontrol:
	dh_gencontrol -- -v$(deb_version) -Vlocal:Version=$(deb_upstream_version) -Vgcc:Version=$(source_version)

execute_before_dh_install-arch:
	for file in debian/*.in; do sed 's/@@VERSION@@/$(target_version)/g;s/@@BASEVERSION@@/$(base_version)/g' < $$file > $${file%%.in}; chmod --reference=$$file $${file%%.in}; done
ifeq (,$(filter ada,$(subst $(COMMA), ,$(languages))))
	sed -i /adalib/d debian/*-runtime.install
endif

override_dh_installdocs-arch:
	dh_installdocs -pgcc-mingw-w64-bootstrap
	dh_installdocs -a --link-doc=gcc-mingw-w64-base

override_dh_strip-arch:
# Strip the binaries
	dh_strip -a -Xw64-mingw32/lib $(patsubst %,-Xw64-mingw32/$(base_version)-%/lib,$(threads)) \
		$(if $(findstring ada,$(languages)),$(patsubst %,-Xw64-mingw32/$(base_version)-%/adalib,$(threads)))
# Strip the libraries
ifeq (,$(filter nostrip,$(DEB_BUILD_OPTIONS)))
	find $(top_dir)/debian -type f -name liblto_plugin.so \
		-exec strip --remove-section=.comment --remove-section=.note --strip-unneeded {} +
	for target in $(targets) $(targetucrt); do \
		find $(top_dir)/debian -path \*/$$target/\* \( \( -path \*/plugin -prune \) -o \( -type f -name lib\*.a -exec $$target-strip --strip-unneeded {} + \) \); \
	done
endif

execute_after_dh_fixperms-arch:
# Fix permissions further - *.ali files must be read-only
	find $(top_dir)/debian -name \*.ali -exec chmod 444 {} +

.PHONY: mingw-w64-patch