[lldb-dev] Bitcode linking with static libs + ARM assembly on Xcode 7

[Sridhar]

Actually the assembly file compiled with "-fembed-bitcode" flag in the
static lib. In Apple developer forums, it was mentioned that, Including
assembly files with "-fembed-bitcode" should just work fine. If I use a
direct assembly file into Xcode App, then its working fine.

I did a bit research with the linker tool (ld) and I could see that, it was
searching for .o file for assembly code externally which is not correct
because it is an archive lib.

On Wed, Jul 29, 2015 at 10:49 AM, Greg Clayton <gclayton at apple.com> wrote:

> Your static libraries need to enable bitcode when the .o files are
> generated. If you have plain assembly files that don't originate from
> source files, I am not sure there is a solution to get assembly files into
> bit code. I will check on this.
>
> > On Jul 28, 2015, at 6:19 PM, Sridhar <sridhar124 at gmail.com> wrote:
> >
> > Hi,
> >
> > I am not sure if this is the right place to post but wanted to give a
> try.
> >
> > I have a static library created by the following commands which has ARM
> assembly code.
> >
> > bash-3.2$
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
> -x assembler-with-cpp -arch armv7 -fmessage-length=0
> -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0 -fmodules
> -gmodules -fmodules-prune-interval=86400
> -Wnon-modular-include-in-framework-module
> -Werror=non-modular-include-in-framework-module -Wno-trigraphs
> -fpascal-strings -O0 -fno-common -Wno-missing-field-initializers
> -Wno-missing-prototypes -Werror=return-type -Wunreachable-code
> -Werror=deprecated-objc-isa-usage -Werror=objc-root-class
> -Wno-missing-braces -Wparentheses -Wswitch -Wunused-function
> -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value
> -Wempty-body -Wconditional-uninitialized -Wno-unknown-pragmas -Wno-shadow
> -Wno-four-char-constants -Wno-conversion -Wconstant-conversion
> -Wint-conversion -Wbool-conversion -Wenum-conversion -Wshorten-64-to-32
> -Wno-newline-eof -DDEBUG=1 -isysroot
> >
> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.0.sdk
> -fstrict-aliasing -Wdeprecated-declarations -miphoneos-version-min=9.0 -g
> -Wno-sign-conversion -I/Users/sridhar/src/arm64/webrtc43/ios/src
> -Iwebrtc/common_audio/resampler/include
> -Iwebrtc/common_audio/signal_processing/include -isysroot
> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.0.sdk
> -fembed-bitcode -fvisibility=hidden -MMD -MT dependencies -MF
> webrtc/common_audio/signal_processing/common_audio.complex_bit_reverse_arm.d
> -c webrtc/common_audio/signal_processing/complex_bit_reverse_arm.S -o
> webrtc/common_audio/signal_processing/common_audio.complex_bit_reverse_arm.o
> >
> > and then using libtool created archive file :
> > bash-3.2$
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool
> -static -o libcommon_audio.a
> webrtc/common_audio/signal_processing/common_audio.complex_bit_reverse_arm.o
> >
> > Then I tried to use the static lib into an iOS app with bitcode enabled.
> The following is the error from Xcode build output :
> > ld: could not open bitcode temp file:
> /Users/sridhar/src/arm64/webrtc43/ios/src/libcommon_audio.a(common_audio.complex_bit_reverse_arm.o)
> for architecture armv7
> >
> > This is only happening with "ARM" assembly symbols, plain C symbols are
> fine.
> >
> > May be @Greg have a clue on this.
> >
> > Thanks,
> > Sri
> > _______________________________________________
> > lldb-dev mailing list
> > lldb-dev at cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
>
>
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