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How to cross-compile clang/llvm for iOS? I need to get libclang (.a or .dylib i believe) to use it via C API in my iOS app.
387
On the other hand, Clang/LLVM is natively a cross-compiler, meaning that one set of programs can compile to all targets by setting the -target option.
All of Apple's operating systems, iOS, macOS, tvOS and watchOS, are built with LLVM technologies. And Xcode, Apple's integrated development environment, supports development in Swift, C, C++, and Objective-C, all of which use and are built with LLVM technologies.
By default, llvm-gcc compiles to native objects just like GCC does. If the -emit-llvm and -c options are given then it will generate LLVM bitcode files instead.
# Get LLVM/Clang
mkdir llvm
curl -O http://llvm.org/releases/3.4/llvm-3.4.src.tar.gz
tar xzfv llvm-3.4.src.tar.gz
cd llvm-3.4/tools/
curl -O http://llvm.org/releases/3.4/clang-3.4.src.tar.gz
tar xzfv clang-3.4.src.tar.gz
mv clang-3.4 clang
cd ..
# Assuming Xcode 5.1 (LLVM 3.5+ requires -stdlib=libc++ as well)
export CC="clang -arch armv7 -mios-version-min=5.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.1.sdk"
export CXX="clang++ -arch armv7 -mios-version-min=5.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.1.sdk"
mkdir build
cd build
../configure \
--prefix=/Users/thomas/tmp/llvm-ios \
--host=arm-apple-darwin11 \
--enable-optimized \
--disable-assertions
unset CC CXX # important! (Otherwise the next step will fail)
make VERBOSE=1 -j...
After a while you will get:
/Users/thomas/tmp/llvm-3.4/lib/Support/Unix/Program.inc:46:10: fatal error: 'crt_externs.h' file not found
#include <crt_externs.h> // _NSGetEnviron
^
Comment the header file and hack the call to _NSGetEnviron() out (you'll get this three times)
make install
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