_tlsstart/_tlsend in the file druntime/src/rt/sections_android.d defined with extern:

extern(C)
{
    /* Symbols created by the compiler/linker and inserted into the
     * object file that 'bracket' sections.
     */
    extern __gshared
    {
        void* __start_deh;
        void* __stop_deh;
        version (LDC)
        {
            void* __start___minfo;
            void* __stop___minfo;
        }
        else
        {
            void* __start_minfo;
            void* __stop_minfo;
        }

        version(X86) size_t _end;
        else version(X86_64) size_t _end;
        else version(ARM) size_t __bss_end__;
        else version(AArch64) size_t __bss_end__;
        else static assert( false, "Android architecture not supported." );

        int _tlsstart;
        int _tlsend;
    }
}

 I can not find the position of _tlsstart/_tlsend.  I try build this example get this error:

extern(C) __gshared extern {
        int _tlsstart;
        int _tlsend;
}
int tls_v1 = 1;
void main(string[] args){
}

/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/usr/bin/../lib/libdruntime-ldc.a(sections_android.o): in function `_D2rt16sections_android12initSectionsFNbNiZv':
sections_android.d:(.text._D2rt16sections_android12initSectionsFNbNiZv[_D2rt16sections_android12initSectionsFNbNiZv]+0x54): undefined reference to `_tlsend'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text._D2rt16sections_android12initSectionsFNbNiZv[_D2rt16sections_android12initSectionsFNbNiZv]+0x64): undefined reference to `_tlsend'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/usr/bin/../lib/libdruntime-ldc.a(sections_android.o): in function `__tls_get_addr':
sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x50): undefined reference to `_tlsstart'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x58): undefined reference to `_tlsstart'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x6c): undefined reference to `_tlsend'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x70): undefined reference to `_tlsend'
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
Error: /data/data/com.termux/files/usr/bin/gcc failed with status: 1

Is this a bugs ?  or the _tlsstart/_tlsend is some symbols import from android system lib ?

On Sunday, 23 June 2019 at 15:34:40 UTC, Newbie2019 wrote:
> _tlsstart/_tlsend in the file druntime/src/rt/sections_android.d defined with extern:

build ldc2 on Android device get this error:

[107/161] Generating bin/ldc2
FAILED: bin/ldc2
cd /data/data/com.termux/files/home/d/tmp && /data/data/com.termux/files/usr/bin/c++ -o /data/data/com.termux/files/home/d/tmp/bin/ldc2 /data/data/com.termux/files/home/d/tmp/obj/ldc2.o /data/data/com.termux/files/home/d/tmp/lib/libldc.a -lLLVM-8 -L/data/data/com.termux/files/usr/lib -L/data/data/com.termux/files/usr/bin/../lib -lphobos2-ldc -ldruntime-ldc -Wl,--gc-sections -ldl -lm
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/usr/lib/libdruntime-ldc.a(sections_android.o): in function `_D2rt16sections_android12initSectionsFNbNiZv':
sections_android.d:(.text._D2rt16sections_android12initSectionsFNbNiZv[_D2rt16sections_android12initSectionsFNbNiZv]+0x54): undefined reference to `_tlsend'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text._D2rt16sections_android12initSectionsFNbNiZv[_D2rt16sections_android12initSectionsFNbNiZv]+0x64): undefined reference to `_tlsend'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/usr/lib/libdruntime-ldc.a(sections_android.o): in function `__tls_get_addr':
sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x50): undefined reference to `_tlsstart'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x58): undefined reference to `_tlsstart'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x6c): undefined reference to `_tlsend'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x70): undefined reference to `_tlsend'
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

On Sunday, 23 June 2019 at 15:34:40 UTC, Newbie2019 wrote:
> Is this a bugs ?  or the _tlsstart/_tlsend is some symbols import from android system lib ?

These 2 symbols are inserted by the compiler into the object file containing the D main function, see https://run.dlang.io/is/QDwmHM. What triple are you using? Make sure there's an `-android` at the end.

On Sunday, 23 June 2019 at 17:09:32 UTC, kinke wrote:
> On Sunday, 23 June 2019 at 15:34:40 UTC, Newbie2019 wrote:
>> Is this a bugs ?  or the _tlsstart/_tlsend is some symbols import from android system lib ?
>
> These 2 symbols are inserted by the compiler into the object file containing the D main function, see https://run.dlang.io/is/QDwmHM. What triple are you using? Make sure there's an `-android` at the end.

here is my cmake options:

D_FLAGS:STRING=-mtriple=aarch64-unknown-linux-android
LDC_TARGET_PRESET:STRING=Android-aarch64
TARGET_SYSTEM:STRING=Android


But when I run ninjia -8,  the D_FLAGS seems not used:

/data/data/com.termux/files/usr/bin/ldmd2 -c -wi -O -inline -release -J/data/data/com.termux/files/home/d/ldc/res -I/data/data/com.termux/files/home/d/ldc -I/data/data/com.termux/files/home/d/tmp -version=IN_LLVM -of/data/data/com.termux/files/home/d/tmp/obj/ldc2.o /data/data/com.termux/files/home/d/ldc/dmd/access.d /data/data/com.termux/files/home/d/ldc/dmd/aggregate.d /data/data/com.termux/files/home/d/ldc/dmd/aliasthis.d /data/data/com.termux/files/home/d/ldc/dmd/apply.d /data/data/com.termux/files/home/d/ldc/dmd/argtypes.d /data/data/com.termux/files/home/d/ldc/dmd/argtypes_sysv_x64.d /data/data/com.termux/files/home/d/ldc/dmd/arrayop.d /data/data/com.termux/files/home/d/ldc/dmd/arraytypes.d /data/data/com.termux/files/home/d/ldc/dmd/ast_node.d /data/data/com.termux/files/home/d/ldc/dmd/astcodegen.d /data/data/com.termux/files/home/d/ldc/dmd/attrib.d /data/data/com.termux/files/home/d/ldc/dmd/blockexit.d /data/data/com.termux/files/home/d/ldc/dmd/builtin.d /data/data/com.termux/files/home/d/ldc/dmd/canthrow.d /data/data/com.termux/files/home/d/ldc/dmd/cli.d /data/data/com.termux/files/home/d/ldc/dmd/clone.d /data/data/com.termux/files/home/d/ldc/dmd/compiler.d /data/data/com.termux/files/home/d/ldc/dmd/complex.d /data/data/com.termux/files/home/d/ldc/dmd/cond.d /data/data/com.termux/files/home/d/ldc/dmd/console.d /data/data/com.termux/files/home/d/ldc/dmd/constfold.d /data/data/com.termux/files/home/d/ldc/dmd/cppmangle.d /data/data/com.termux/files/home/d/ldc/dmd/cppmanglewin.d /data/data/com.termux/files/home/d/ldc/dmd/ctfeexpr.d /data/data/com.termux/files/home/d/ldc/dmd/ctorflow.d /data/data/com.termux/files/home/d/ldc/dmd/dcast.d /data/data/com.termux/files/home/d/ldc/dmd/dclass.d /data/data/com.termux/files/home/d/ldc/dmd/declaration.d /data/data/com.termux/files/home/d/ldc/dmd/delegatize.d /data/data/com.termux/files/home/d/ldc/dmd/denum.d /data/data/com.termux/files/home/d/ldc/dmd/dimport.d /data/data/com.termux/files/home/d/ldc/dmd/dinterpret.d /data/data/com.termux/files/home/d/l
32419 u0_a167   0:09 /data/data/com.termux/files/usr/bin/ldc2 -ldmd -c -wi -O -enable-inlining -Hkeep-all-bodies -release -J/data/data/com.termux/files/home/d/ldc/res -I/data/data/com.termux/files/home/d/ldc -I/data/data/com.termux/files/home/d/tmp -d-version=IN_LLVM -of/data/data/com.termux/files/home/d/tmp/obj/ldc2.o /data/data/com.termux/files/home/d/ldc/dmd/access.d /data/data/com.termux/files/home/d/ldc/dmd/aggregate.d /data/data/com.termux/files/home/d/ldc/dmd/aliasthis.d /data/data/com.termux/files/home/d/ldc/dmd/apply.d /data/data/com.termux/files/home/d/ldc/dmd/argtypes.d /data/data/com.termux/files/home/d/ldc/dmd/argtypes_sysv_x64.d /data/data/com.termux/files/home/d/ldc/dmd/arrayop.d /data/data/com.termux/files/home/d/ldc/dmd/arraytypes.d /data/data/com.termux/files/home/d/ldc/dmd/ast_node.d /data/data/com.termux/files/home/d/ldc/dmd/astcodegen.d /data/data/com.termux/files/home/d/ldc/dmd/attrib.d /data/data/com.termux/files/home/d/ldc/dmd/blockexit.d /data/data/com.termux/files/home/d/ldc/dmd/builtin.d /data/data/com.termux/files/home/d/ldc/dmd/canthrow.d /data/data/com.termux/files/home/d/ldc/dmd/cli.d /data/data/com.termux/files/home/d/ldc/dmd/clone.d /data/data/com.termux/files/home/d/ldc/dmd/compiler.d /data/data/com.termux/files/home/d/ldc/dmd/complex.d /data/data/com.termux/files/home/d/ldc/dmd/cond.d /data/data/com.termux/files/home/d/ldc/dmd/console.d /data/data/com.termux/files/home/d/ldc/dmd/constfold.d /data/data/com.termux/files/home/d/ldc/dmd/cppmangle.d /data/data/com.termux/files/home/d/ldc/dmd/cppmanglewin.d /data/data/com.termux/files/home/d/ldc/dmd/ctfeexpr.d /data/data/com.termux/files/home/d/ldc/dmd/ctorflow.d /data/data/com.termux/files/home/d/ldc/dmd/dcast.d /data/data/com.termux/files/home/d/ldc/dmd/dclass.d /data/data/com.termux/files/home/d/ldc/dmd/declaration.d /data/data/com.termux/files/home/d/ldc/dmd/delegatize.d /data/data/com.termux/files/home/d/ldc/dmd/denum.d /data/data/com.termux/files/home/d/ldc/dmd/dimport.d /data/data/com.termux/files/home/d/ldc/dmd/dinterpret.d /d



try with example file from termux also get this error:

ldc2 -mtriple=aarch64-unknown-linux-android test.d
ldc2 -mtriple=aarch64-linux-android test.d

/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/usr/bin/../lib/libdruntime-ldc.a(sections_android.o): in function `_D2rt16sections_android12initSectionsFNbNiZv':
sections_android.d:(.text._D2rt16sections_android12initSectionsFNbNiZv[_D2rt16sections_android12initSectionsFNbNiZv]+0x54): undefined reference to `_tlsend'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text._D2rt16sections_android12initSectionsFNbNiZv[_D2rt16sections_android12initSectionsFNbNiZv]+0x64): undefined reference to `_tlsend'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/usr/bin/../lib/libdruntime-ldc.a(sections_android.o): in function `__tls_get_addr':
sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x50): undefined reference to `_tlsstart'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x58): undefined reference to `_tlsstart'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x6c): undefined reference to `_tlsend'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: sections_android.d:(.text.__tls_get_addr[__tls_get_addr]+0x70): undefined reference to `_tlsend'
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
Error: /data/data/com.termux/files/usr/bin/gcc failed with status: 1

On Sunday, 23 June 2019 at 17:09:32 UTC, kinke wrote:
> These 2 symbols are inserted by the compiler into the object file containing the D main function, see https://run.dlang.io/is/QDwmHM. What triple are you using? Make sure there's an `-android` at the end.

Then I build normal example with TLS var on android, it work as expect. But when I try build ldc it self from Android, I get this error. (because the source code link with druntime/src/rt/sections_android.d, and there is no symbols of _tlsstart/_tlsend)

The cmake force to use ldmd2 and there is no `-mtriple=aarch64-unknown-linux-android` pass to ldmd2 when I run ninja.

Then I try cross build from macOS get this error:

ldc-build-runtime --ninja --targetPreset=Android-aarch64 --buildDir=/opt/local/droid/droid64

core/sys/posix/aio.d(481): Error: undefined identifier `aiocb`
core/sys/posix/aio.d(482): Error: undefined identifier `aiocb`
core/sys/posix/aio.d(483): Error: undefined identifier `aiocb`
core/sys/posix/aio.d(484): Error: undefined identifier `aiocb`
core/sys/posix/aio.d(485): Error: undefined identifier `aiocb`
core/sys/posix/aio.d(486): Error: undefined identifier `aiocb`
core/sys/posix/aio.d(487): Error: undefined identifier `aiocb`
core/sys/posix/aio.d(488): Error: undefined identifier `aiocb`
ninja: build stopped: subcommand failed.
Error: command failed with status 1

try build example with cross betterC:

export CC=/Users/android/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang
ldmd2 -L-L/opt/local/droid/droid64/lib -Xcc=--sysroot=/Users/android/Library/Android/sdk/ndk-bundle/platforms/android-27/arch-arm64 -Xcc=-target -Xcc=aarch64-none-linux-android -Xcc=-fpie -Xcc=-pie -betterC test_android_tls.d -mtriple=aarch64-unknown-linux-android

test_android_tls.d:(.text.main[main]+0x14): undefined reference to `_tlsstart'

On Monday, 24 June 2019 at 03:10:40 UTC, Newbie2019 wrote:
> Then I build normal example with TLS var on android, it work as expect.

Okay, that's what I expected (although your earlier posts seem to contradict this).

> But when I try build ldc it self from Android, I get this error.

Yeah, LDC and LDMD themselves don't have a D main anymore since v1.15, so they don't get these 2 symbols automatically anymore. Our Android guy has left the scene, so we haven't been aware of this.

On Monday, 24 June 2019 at 09:38:36 UTC, kinke wrote:
> On Monday, 24 June 2019 at 03:10:40 UTC, Newbie2019 wrote:
>> Then I build normal example with TLS var on android, it work as expect.
>
> Okay, that's what I expected (although your earlier posts seem to contradict this).
>
>> But when I try build ldc it self from Android, I get this error.
>
> Yeah, LDC and LDMD themselves don't have a D main anymore since v1.15, so they don't get these 2 symbols automatically anymore. Our Android guy has left the scene, so we haven't been aware of this.

Thanks for explain, I will try some work around.

On Monday, 24 June 2019 at 17:29:02 UTC, Newbie2019 wrote:
> I will try some work around.

You could try adding the following to driver/main.d:

import ldc.attributes;

extern (C) __gshared
{
    @section(".tdata")
    int _tlsstart = 0;
    @section(".tcommon")
    int _tlsend = 0;
}

On Monday, 24 June 2019 at 18:31:36 UTC, kinke wrote:
> On Monday, 24 June 2019 at 17:29:02 UTC, Newbie2019 wrote:
>> I will try some work around.
>
> You could try adding the following to driver/main.d:
>
> import ldc.attributes;
>
> extern (C) __gshared
> {
>     @section(".tdata")
>     int _tlsstart = 0;
>     @section(".tcommon")
>     int _tlsend = 0;
> }

This solve the _tlsstart/_tlsend problem, now I get a ldc2 binary for aarch64.

when I use the new ldc2 built example, I get this error:


ldc2 sieve.d
#### rootHasMain=1 env=10 android=10
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: _tlsstart: TLS definition in sieve.o section .tdata mismatches non-TLS reference in /data/data/com.termux/files/home/d/tmp/lib/libdruntime-ldc.a(sections_android.o)
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/d/tmp/lib/libdruntime-ldc.a: error adding symbols: bad value
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
Error: /data/data/com.termux/files/usr/bin/gcc failed with status: 1


ldc2 sieve.d -Xcc=-fuse-ld=lld -Xcc=-L/system/lib64
ld.lld: error: undefined symbol: __bss_end__
>>> referenced by sections_android.d
>>>               sections_android.o:(_D2rt16sections_android12initSectionsFNbNiZv) in archive /data/data/com.termux/files/home/d/tmp/lib/libdruntime-ldc.a

ld.lld: error: undefined symbol: __bss_end__
>>> referenced by sections_android.d
>>>               sections_android.o:(_D2rt16sections_android12initSectionsFNbNiZv) in archive /data/data/com.termux/files/home/d/tmp/lib/libdruntime-ldc.a
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
Error: /data/data/com.termux/files/usr/bin/gcc failed with status: 1


Link with lld report there is no symbol __bss_end__,  I guess we need patch driver/codegenerator.cpp to fix this error ?

I add ` emitSymbolAddrGlobal(ir_->module, "__bss_end__", "_d_execBssEndAddr");`  after the `endSymbol` define, but not work.

any suggestion to fix this __bss_end__ issue for Android ?

On Monday, 24 June 2019 at 18:31:36 UTC, kinke wrote:
> You could try adding the following to driver/main.d:

Correct me if I am wrong.   Some how the ldc change the auto generate _tlsstart to TLS, but it referenced as non-TLS in sections_android.o cause the problem ?

I change _tlsstart to tls in  sections_android.d the ldc can generate binary, but Segmentation fault at _D3std11concurrency10MessageBox3putMFKSQBlQBk7MessageZv ()



There also a ldc Segmentation:
----------------
pragma(LDC_no_moduleinfo);
pragma(LDC_no_typeinfo)
void main(){}
---------------

ldmd2 dmain.d -c -mtriple=aarch64-linux-android

0  ldc2                     0x0000000108425768 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1  ldc2                     0x0000000108424887 llvm::sys::RunSignalHandlers() + 39
2  ldc2                     0x0000000108425d78 SignalHandler(int) + 264
3  libsystem_platform.dylib 0x00007fff66d20b5d _sigtramp + 29
4  ldc2                     0x0000000108ea819e GCC_except_table13 + 702442
5  ldc2                     0x000000010814dabe llvm::Mangler::getNameWithPrefix(llvm::SmallVectorImpl<char>&, llvm::GlobalValue const*, bool) const + 110
6  ldc2                     0x0000000107a14496 llvm::TargetMachine::getSymbol(llvm::GlobalValue const*) const + 134
7  ldc2                     0x00000001076f4294 llvm::AsmPrinter::EmitGlobalVariable(llvm::GlobalVariable const*) + 180
8  ldc2                     0x00000001076f9088 llvm::AsmPrinter::doFinalization(llvm::Module&) + 104
9  ldc2                     0x0000000108142e63 llvm::FPPassManager::doFinalization(llvm::Module&) + 51
10 ldc2                     0x00000001081432c3 llvm::legacy::PassManagerImpl::run(llvm::Module&) + 1091
11 ldc2                     0x00000001067af18b (anonymous namespace)::codegenModule(llvm::TargetMachine&, llvm::Module&, llvm::raw_fd_ostream&, llvm::TargetMachine::CodeGenFileType) + 283
12 ldc2                     0x00000001067aeb7c writeModule(llvm::Module*, char const*) + 4092
13 ldc2                     0x00000001067a8945 ldc::CodeGenerator::writeAndFreeLLModule(char const*) + 1541
14 ldc2                     0x00000001067a8fce ldc::CodeGenerator::emit(Module*) + 782
15 ldc2                     0x00000001067c264d codegenModules(Array<Module*>&) + 237
16 ldc2                     0x00000001065715dd mars_mainBody(Param&, Array<char const*>&, Array<char const*>&) + 5309
Error: Error executing /opt/local/bin/ldc2: Segmentation fault: 11