[regression] Boost 1.70.0: iostreams can't detect ZLIB library on iOS

[ruslo]

Xcode version:

> xcodebuild -version
Xcode 9.4.1
Build version 9F2000

boost.user.jam content:

> export TOPDIR=`pwd`
> cat $TOPDIR/boost.user.jam

using darwin : iphoneos
    : xcrun clang++  -arch armv7 -arch armv7s -arch arm64 -isysroot /Applications/develop/ide/xcode/9.4.1/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS11.4.sdk
    : <striper> <root>/Applications/develop/ide/xcode/9.4.1/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer
    : <architecture>arm <target-os>iphone
;

using darwin : iphonesimulator
    : xcrun clang++  -arch i386 -arch x86_64 -isysroot /Applications/develop/ide/xcode/9.4.1/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator11.4.sdk
    : <striper> <root>/Applications/develop/ide/xcode/9.4.1/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer
    : <architecture>x86 <target-os>iphone
;

Third party:

> ls $TOPDIR/third_party/include/{zlib.h,bzlib.h}

/.../third_party/include/bzlib.h
/.../third_party/include/zlib.h

> lipo -info $TOPDIR/third_party/lib/{libz.a,libbz2.a}

Architectures in the fat file: /.../third_party/lib/libz.a are: i386 armv7 armv7s x86_64 arm64 
Architectures in the fat file: /.../third_party/lib/libbz2.a are: i386 armv7 armv7s x86_64 arm64

Download and unpack:

> wget https://dl.bintray.com/boostorg/release/1.70.0/source/boost_1_70_0.tar.bz2
> tar xf boost_1_70_0.tar.bz2
> cd boost_1_70_0/

Bootstrap and build:

> ./bootstrap.sh --with-libraries=iostreams --prefix=$TOPDIR/_install

> ./b2 \
    "-d+2 --debug-configuration" \
    toolset=darwin-iphoneos \
    target-os=iphone \
    architecture=arm \
    instruction-set=armv7 \
    -a \
    link=static \
    threading=multi \
    variant=release,debug \
    define=BOOST_SP_NO_SYNC \
    --layout=tagged \
    --user-config=$TOPDIR/boost.user.jam \
    -s NO_COMPRESSION=0 \
    -s NO_ZLIB=0 \
    -s NO_BZIP2=0 \
    -s ZLIB_INCLUDE=$TOPDIR/third_party/include \
    -s ZLIB_LIBPATH=$TOPDIR/third_party/lib \
    -s ZLIB_BINARY=z \
    -s BZIP2_INCLUDE=$TOPDIR/third_party/include \
    -s BZIP2_LIBPATH=$TOPDIR/third_party/lib \
    -s BZIP2_BINARY=bz2 \
    "cxxflags=-std=c++14 -miphoneos-version-min=9.3"

Output:

Performing configuration checks
    ...

Building the Boost C++ Libraries.

    - zlib                     : no
    - bzip2                    : no
    ...

Component configuration:

    ...
    - iostreams                : building
    ...

In file bin.v2/config.log:

"xcrun" "clang++" "-arch" "armv7" "-arch" "armv7s" "-arch" "arm64"
    "-isysroot" "/Applications/develop/ide/xcode/9.4.1/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS11.4.sdk"
    -L"/.../third_party/lib"
    -o "bin.v2/standalone/ac/darwin-iphoneos/release/architecture-arm/instruction-set-armv7/link-static/target-os-iphone/threading-multi/visibility-hidden/z"
    "bin.v2/standalone/ac/darwin-iphoneos/release/architecture-arm/instruction-set-armv7/link-static/target-os-iphone/threading-multi/visibility-hidden/main-z.o"
    -lrt
    -lz
    -pthread -fvisibility=hidden -fvisibility-inlines-hidden -Wl,-dead_strip -no_dead_strip_inits_and_terms -arch armv7 

Error:

ld: library not found for -lrt

The same configuration worked fine with Boost 1.65.1. Since Boost 1.66.0 it is not working.

[mateuszzz88]

I also have this problem. Is there some workaround or fix?

[mateuszzz88]

I worked it around by adding -L. in tools/build/src/user-config.jam and doing ln -s $(xcrun --sdk iphoneos --show-sdk-path)/usr/lib/libpkstart.a librt.a in sources dir. If script wants to link -lrt I will give it. I hoped that empty file would suffice, but it doesn't, so I linked random library that happens to really exist.
This is embarrassing but seems to work.

[limbolily]

I have the same problem. #678

[stale]

Thank you for your contributions. Main development of B2 has moved to https://github.com/bfgroup/b2
This issue has been automatically marked as "transition" to indicate the potential for needing transition to the new B2 development project.