PowerPC Seamonkey 2.49.x mozconfig

# If cross compiling, build Seamonkey from inside a chroot, since a lot of the
# '-dev' libs don't work otherwise in multiarch (due to conflicts with native
# architecture '-dev' packages).

# built in mid-to-late 2018 in Debian Sid.

# if building _on a PPC host_, you might have to change a few of the lines
# below. I'll try to mark them. There might also be some other lines I
# hardcoded that need changing on your particular setup, such as the
# 'MOZ_OBJDIR' definition. There used to be a bug (which may or may not exist
# anymore) that needed to be worked around by hardcoding the MOZ_OBJDIR path.

# You may also be able to speed up the build on multi-core/multi-CPU systems by
# changing 'MOZ_MAKE_FLAGS="-j3"' to something else (your core count); if
# running on a single-core machine, you should probably either remove the line
# entirely, or else set it as 'MOZ_MAKE_FLAGS="-j1"' instead (so that it only
# tries to run a single build job at a time instead of running three).

# This config stemmed from the Seamonkey and Firefox builds I was already doing
# on my Intel machines, and I simply modified it for PPC builds. Also, if you
# are having trouble feel free to contact me and ask for help, but my reply
# times may vary wildly since I'm a student who doesn't have a very predictable
# workload.


######################## CROSS-COMPILATION BLOCK START ########################
#   Try commenting out this area if not cross-compiling. Edit as necessary.   #
###############################################################################

# Whether or not to cross compile. Comment out for native builds. Will run
# tests that don't otherwise try to run on a cross-compilation (since you
# can't run non-native binaries, usually).
CROSS_COMPILE=1

# compilation machine type designation:
ac_add_options --host=x86_64-linux-gnu

# target machine type designation (same as cross-compiler prefix):
ac_add_options --target=powerpc-linux-gnu

# PATHs to search for pkg-config '.pc' files; multiple paths separated by
# colons (':') can be specified.
export PKG_CONFIG_PATH=/usr/lib/powerpc-linux-gnu/pkgconfig

# Compiler/binutils program names for cross-compilation:
# May or may not be necessary; can't remember anymore.
export CC=powerpc-linux-gnu-gcc
export CXX=powerpc-linux-gnu-g++
export LD=powerpc-linux-gnu-ld
export AR=powerpc-linux-gnu-ar
export AS=powerpc-linux-gnu-as
export NM=powerpc-linux-gnu-nm
export CPP=powerpc-linux-gnu-cpp
export RANLIB=powerpc-linux-gnu-ranlib
export GPROF=powerpc-linux-gnu-gprof
export GCOV=powerpc-linux-gnu-gcov
export OBJCOPY=powerpc-linux-gnu-objcopy
export OBJDUMP=powerpc-linux-gnu-objdump
export PKGCONFIG=powerpc-linux-gnu-pkg-config
export PKG_CONFIG=powerpc-linux-gnu-pkg-config
export STRIP=powerpc-linux-gnu-strip

######################### CROSS-COMPILATION BLOCK END #########################

################### MISC. BUILD SYSTEM OPTIONS/TOGGLES START ##################
#     Change these to fit your needs, target CPU type, and build machine.     #
###############################################################################

# MOZ_MAKE_FLAGS
#   Number of make jobs to run at a time.
#     rule of thumb: set to the number of CPU cores on your build machine.
#     Often speeds up build time pretty significantly on multi-core systems.
# -----------------------------------------------------------------------------
mk_add_options MOZ_MAKE_FLAGS="-j3"

# MOZ_OBJDIR
#   Where to put intermediate compilation objects (.o files)
#     rule of thumb: try the full path to your source code folder, plus
#     'obj-powerpc-linux-gnu'). You may want to create the directory before
#     you build, but I don't know if it's necessary or not.
#   I _believe_ there was a bug at the time with the build system, one which
#   basically required hard-coding this path as the workaround.
# -----------------------------------------------------------------------------
mk_add_options MOZ_OBJDIR=/home/wyatt/development/powerpc/seamonkey-2.49.5/obj-powerpc-linux-gnu

# prefix
#   install-time destination for files on the target machine.
#     Probably /usr or /usr/local on most linux machines, but could also be
#     somewhere like /opt/seamonkey. Just make sure (PREFIX)/bin is on your
#     PATH environment variable, or you won't be able to just type 'seamonkey'
#     to run it!
#
#   Defaults to '/usr/local' if not set, I think.
# -----------------------------------------------------------------------------
ac_add_options --prefix=/usr

# More miscellaneous Mozilla build options

# Build the 'release' target (not a 'debug' or 'development' one)
ac_add_options --enable-release

# Disable automatic updater, since we aren't a supported architecture anyway :)
ac_add_options --disable-updater

# disable geographical location functionality (optional):
ac_add_options --disable-necko-wifi

# Audio subsystems selection:
#   FF 52 and onward build with alsa disabled by default in favor of only
#   supporting pulseaudio. Since I don't use pulseaudio, I changed this. This
#   has to be done at build-time. I believe it's okay to have both enabled
#   as well, but I have had many negative experiences with pulse, so I
#   personally try to keep it out of my software whenever possible.
#
#   If you use pulseaudio, you should probably enable it, since from what I've
#   read on the mailing lists and bug tracker there might be trouble with
#   microphones/audio inputs in the alsa code. Stereo playback works fine.
ac_add_options --disable-pulseaudio
ac_add_options --enable-alsa

# --enable-application=suite just says to build seamonkey, not Firefox.
# Firefox's internal application name is 'browser.'
ac_add_options --enable-application=suite

# Tests on cross-compilation may cause build failures.
#   even if they work, they also slow down build time.
ac_add_options --disable-tests

# Brand as 'seamonkey'
ac_add_options --enable-official-branding

#################### MISC. BUILD SYSTEM OPTIONS/TOGGLES END ###################

##################### POWERPC BUG FIXES/WORKAROUNDS START #####################
# SM will probably either fail to build or crash without these.               #
###############################################################################

# COMPILER OPTIMIZATIONS (--enable-optimize):
#   This was a VERY HACKY thing I did, basically bolting additional compiler
#   flags off the end of the optimization flag. Don't try this at home, kids
#   (I should really have exported 'CXXFLAGS' and 'CFLAGS' instead, and left
#   the -O2 and possibly the -f* options here).
# ----------------------------------------------------------------------------#
# READ THE NOTES AT THE BOTTOM OF THE FILE BEFORE YOU CHANGE THIS; I KNOW IT  #
# LOOKS WEIRD, BUT THERE'S A REASON.                                          #
# You will probably have to change at least the '-I' inclusion below for your #
# machine, if you are cross compiling (unless you're on GCC 7.3 on Debian).   #
# -----------------------------------------------------------------------------
ac_add_options --enable-optimize="-O2 -I/usr/powerpc-linux-gnu/include/7.3.0/powerpc-linux-gnu -Wl,--no-keep-memory -Wl,--relax -fno-delete-null-pointer-checks -fno-lifetime-dse -fno-schedule-insns2"

# Fix ICU bug that causes cryptic segfaults
# (this one was a REALLY fun bug to try to figure out).
ac_add_options --with-system-icu


# I don't remember why this line is here, but it was commented out in my
# mozconfig. Keeping for posterity.
# ac_add_options --with-l10n-base=/root/seamonkey-2.49.5/l10n


# See below notes about optimization flags; essentially, these flags are
# critical, and without them your seamonkey build will be highly unstable
# (randomly crash) and perform quite badly - at least under GCC 7.3.
export LDFLAGS="-Wl,--no-keep-memory -Wl,--relax"
export CFLAGS="-Wl,--no-keep-memory -Wl,--relax -fno-delete-null-pointer-checks -fno-schedule-insns2"
export CXXFLAGS="-Wl,--no-keep-memory -Wl,--relax -fno-delete-null-pointer-checks -fno-schedule-insns2"

###################### POWERPC BUG FIXES/WORKAROUNDS END ######################

#==============================================================================
# PLEASE, PLEASE, PLEASE NOTE that without:
# '-Wl,--no-keep-memory -Wl,--relax -fno-delete-null-pointer-checks -fno-lifetime-dse'
# SOMEWHERE in the build flags, the resulting seamonkey build (using GCC 7.3,
# at least) will be HIGHLY unstable and badly-performing.
#
# These compiler flags are CRITICAL, so if you decide to clean up the
# '--enable-optimize' arguments, make sure that you put the other flags
# somewhere else and don't just omit them.
#
# I feel like I put these here specifically because I needed the '-Wl,*' flags
# to be on some compilation/link-time procedures, and CFLAGS/CXXFLAGS/LDFLAGS
# weren't getting applied to them, but I noticed the optimization ones _were_
# so I slapped them on the end of it.

# It's possible that LLVM/Clang or newer GCC wouldn't have these problems (and
# indeed, LLVM/Clang doesn't even have -fno-schedule-insns2 or
# -fno-lifetime-dse, I think), but I have not tried LLVM/Clang builds for
# PowerPC yet.
#==============================================================================