Compile issues when cross compiling for iOS with external dependencies

From: Ardavon Falls (afalls_at_[hidden])
Date: 2020-11-10 04:18:41

When attempting to cross-compile boost 1.69.0 for iOS (with clang) and
using external dependencies it fails to compile because when it tests to
see if the dependencies are valid, it fails to compile the test program
correctly due to it attempting to add incorrect linker flags. I tried
modifying the boost.build to not add those flags but it seemed to unravel a
rat's nest of issues (attempting to link with librt even though its for
iOS, compiled the test program for x86 and not arm, etc.., etc..)

The error I keep getting is...
ld: unknown option: --start-group

Thank you for your help.

I am using the following b2 options..

./b2 --prefix=/Users/afalls/delete-me/build-boost/install/ \
     --build-dir=/Users/afalls/delete-me/build-boost/build/ \
--user-config=/Users/afalls/delete-me/build-boost/ios-config.jam \
--with-math \
--with-wave \
--with-container \
--with-contract \
--with-exception \
--with-graph \
--with-iostreams \
--with-locale \
--with-log \
--with-program_options \
--with-random \
--with-regex \
--with-mpi \
--with-serialization \
--with-coroutine \
--with-fiber \
--with-context \
--with-timer \
--with-thread \
--with-chrono \
--with-date_time \
--with-atomic \
--with-filesystem \
--with-system \
--with-graph_parallel \
--with-stacktrace \
--with-test \
--with-type_erasure \
     -q \
-j 16 \
     toolset=clang \
threading=multi \
     architecture=arm \
     abi=aapcs \
     binary-format=mach-o \
address-model=64 \
     cxxflags="${IOS_CXXFLAGS}" \
     cflags="${IOS_CFLAGS}" \
     target-os=iphone \
     link=static \
     variant=release \
     define=_LITTLE_ENDIAN \
     install

My user-config.jam file is below...

import os ;

using clang :
:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
-arch arm64 -DBOOST_AC_USE_PTHREADS -DBOOST_SP_USE_PTHREADS
-Wno-unused-local-typedef -Wno-nullability-completeness
-miphoneos-version-min=9.0 -fPIC
:
<stripper>
<root>/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk
<architecture>arm
<target-os>iphone
<include>/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include
;

using zlib : 1.2.11 :
<include>/Users/afalls/.conan/data/zlib/1.2.11/channel/niantic/package/d522642044ded35b1d89ab2201a41e2c5d74a0b0/include
<search>/Users/afalls/.conan/data/zlib/1.2.11/channel/niantic/package/d522642044ded35b1d89ab2201a41e2c5d74a0b0/lib
<name>z ;
using lzma : 5.2.4 :
<include>/Users/afalls/.conan/data/xz_utils/5.2.4/channel/niantic/package/d522642044ded35b1d89ab2201a41e2c5d74a0b0/include
<search>/Users/afalls/.conan/data/xz_utils/5.2.4/channel/niantic/package/d522642044ded35b1d89ab2201a41e2c5d74a0b0/lib
<name>lzma ;
using bzip2 : 1.0.8 :
<include>/Users/afalls/.conan/data/bzip2/1.0.8/channel/niantic/package/d522642044ded35b1d89ab2201a41e2c5d74a0b0/include
<search>/Users/afalls/.conan/data/bzip2/1.0.8/channel/niantic/package/d522642044ded35b1d89ab2201a41e2c5d74a0b0/lib
<name>bz2 ;
using zstd : 1.4.4 :
<include>/Users/afalls/.conan/data/zstd/1.4.4/channel/niantic/package/d522642044ded35b1d89ab2201a41e2c5d74a0b0/include
<search>/Users/afalls/.conan/data/zstd/1.4.4/channel/niantic/package/d522642044ded35b1d89ab2201a41e2c5d74a0b0/lib
<name>zstd ;