Compiling on Arm

[bioinfornatics]

Dear,
build issue with arm

/builddir/build/BUILD/ldc-0.13.0-beta1-src/runtime/druntime/src/core/sys/posix/sys/stat.d(375): Error: static assert  (96u == 104u) is false
make[2]: *** [runtime/src/core/sys/posix/sys/stat-debug.o] Error 1

complete build log: http://kojipkgs.fedoraproject.org//work/tasks/4898/6864898/build.log

[redstar]

Hi,
this surprises me a bit. At least cross-compiling on Windows, I get the same error (-mtriple=armv7-linux-gnuehabi). I need to check it on my ARM box, too. I am sure that this used to compile.

[bioinfornatics]

Hi redstar,

Did you have find where is problem come from ?

[redstar]

No. I see the failure if I cross-compile from x86. There is no failure on my native ARM box. The unit test builds and runs (almost):

185/1116 Test #185: druntime_src_core_sys_posix_sys_stat_debug_build .........   Passed    3.23 sec
        Start 186: druntime_src_core_sys_posix_sys_stat_debug_run
186/1116 Test #186: druntime_src_core_sys_posix_sys_stat_debug_run ...........***Exception: SegFault  0.02 sec
        Start 187: druntime_src_core_sys_posix_sys_stat_release_build
187/1116 Test #187: druntime_src_core_sys_posix_sys_stat_release_build .......   Passed    4.53 sec
        Start 188: druntime_src_core_sys_posix_sys_stat_release_run
188/1116 Test #188: druntime_src_core_sys_posix_sys_stat_release_run .........   Passed    0.02 sec

[redstar]

Ok, I rechecked this. Native compilation works, cross compilation does not work (see issue #259 and pull request #643).
Is this a cross compile?

[redstar]

It depends on the used target triple. armv7a-unknown-linux-gnueabihf works but armv7-unknown-linux-gnuehabi does not. Needs further investigations.

[bioinfornatics]

OK thanks @redstar

[bioinfornatics]

little update.
LDC fail always to build on arm. A piece of build log

[ 27%] Generating src/core/sys/posix/sys/stat.o
cd /builddir/build/BUILD/ldc-0.15.1-src && /builddir/build/BUILD/ldc-0.15.1-src/build/bin/ldc2 --output-o -c -I/builddir/build/BUILD/ldc-0.15.1-src/runtime/druntime/src -I/builddir/build/BUILD/ldc-0.15.1-src/runtime/druntime/src/gc /builddir/build/BUILD/ldc-0.15.1-src/runtime/druntime/src/core/sys/posix/sys/stat.d -of/builddir/build/BUILD/ldc-0.15.1-src/build/runtime/src/core/sys/posix/sys/stat.o -w -d -relocation-model=pic -O3 -release -disable-invariants -d-version=Shared
/usr/bin/cmake -E cmake_progress_report /builddir/build/BUILD/ldc-0.15.1-src/build/CMakeFiles 
/usr/bin/cmake -E cmake_progress_report /builddir/build/BUILD/ldc-0.15.1-src/build/CMakeFiles 
[ 27%] /usr/bin/cmake -E cmake_progress_report /builddir/build/BUILD/ldc-0.15.1-src/build/CMakeFiles 
[ 27%] Generating src/core/sys/posix/sys/wait.o
cd /builddir/build/BUILD/ldc-0.15.1-src && /builddir/build/BUILD/ldc-0.15.1-src/build/bin/ldc2 --output-o -c -I/builddir/build/BUILD/ldc-0.15.1-src/runtime/druntime/src -I/builddir/build/BUILD/ldc-0.15.1-src/runtime/druntime/src/gc /builddir/build/BUILD/ldc-0.15.1-src/runtime/druntime/src/core/sys/posix/sys/wait.d -of/builddir/build/BUILD/ldc-0.15.1-src/build/runtime/src/core/sys/posix/sys/wait.o -w -d -relocation-model=pic -O3 -release -disable-invariants -d-version=Shared
[ 27%] Generating src/core/sys/posix/sys/socket.o
cd /builddir/build/BUILD/ldc-0.15.1-src && /builddir/build/BUILD/ldc-0.15.1-src/build/bin/ldc2 --output-o -c -I/builddir/build/BUILD/ldc-0.15.1-src/runtime/druntime/src -I/builddir/build/BUILD/ldc-0.15.1-src/runtime/druntime/src/gc /builddir/build/BUILD/ldc-0.15.1-src/runtime/druntime/src/core/sys/posix/sys/socket.d -of/builddir/build/BUILD/ldc-0.15.1-src/build/runtime/src/core/sys/posix/sys/socket.o -w -d -relocation-model=pic -O3 -release -disable-invariants -d-version=Shared
/builddir/build/BUILD/ldc-0.15.1-src/runtime/druntime/src/core/sys/posix/sys/stat.d(440): Error: static assert  (96u == 104u) is false
runtime/CMakeFiles/druntime-ldc.dir/build.make:355: recipe for target 'runtime/src/core/sys/posix/sys/stat.o' failed
make[2]: *** [runtime/src/core/sys/posix/sys/stat.o] Error 1

full log

Fedora use these switch to build on arm:

-march=armv7-a -mfpu=vfpv3-d16  -mfloat-abi=hard

I hope that will help you

[bioinfornatics]

Does the new beta release fix it ?

[redstar]

I can't check because my ARM device is currently not usable.

[denizzzka]

Same error

$ ldc2 -march=thumb -mcpu=cortex-m3 -c -g start.d
/usr/include/d/core/sys/posix/sys/stat.d(440): Error: static assert  (96u == 104u) is false

if I am trying to add "import dopencm3.gpio;" into start.d:

But it is work fine if

$ ldc2 -c -g start.d

is used or if "import dopencm3.gpio;" is commented out

[bioinfornatics]

update still failling with the alpha3 release 8956066

/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
In file included from /builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asmstmt.cpp:113:0:
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
     };
     ^
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
/builddir/build/BUILD/ldc-0.16.0-alpha3-src/gen/asm-x86.h:225:5: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
CMakeFiles/LDCShared.dir/build.make:2524: recipe for target 'CMakeFiles/LDCShared.dir/gen/asmstmt.cpp.o' failed

full log

[redstar]

The error occurs because char is unsigned char on ARM and signed char on x86 and GCC 5.x now makes the narrowing conversion an error. I'll try to fix this but you could also try to add -DEXTRA_CXXFLAGS=-fsigned-char to the cmake call.

[redstar]

Fixed in master.

[cottsay]

I just tested 0.16.1. With or without -DEXTRA_CXXFLAGS=-fsigned-char, the narrowing conversion errors are gone.

Unfortunately, with or without -DEXTRA_CXXFLAGS=-fsigned-char, I still see Error: static assert (96u == 104u) is false.

@redstar, what is the reason behind -DEXTRA_CXXFLAGS=-fsigned-char? Should it be set only on ARM builds or all arches?

--scott