Re: Symbian: unalighned relocations for pointers-to-members

[Richard Earnshaw <Richard.Earnshaw@foss.arm.com>]

On 16/12/2021 00:39, Фёдар Стрыжнёў (Fiodar Stryzhniou) via Gcc-help wrote:
> Hello. I maintain ScummVM port for Symbian Series 60v3. ScummVM is a complete rewrite of hundreds old games' executables and is not an emulator. It's free and opensource.
> 
> Last year, when I prepared a version 2.2.0 in the release, it was faced with the fact that when the Ultima engine is turned on in the executable file (supports Ultima 1, 4, 6, 8), it does not start. Ultima 4 & 6 support disabling allowed SCUMMVM. In the spring of this year, after some changes in the source code Ultima, the elf2e32 utility has begun to complete the work with the error "Line 427". To clarify the causes of the error, a rebeling of the code responsible for the support of Ultima 4 & 6 was carried out.
> The rebel passed as follows:
> 1. Removed ultima.lib (Static Library)
> 2. Left the entry point, deleted all other files associated with Ultima 4/6 from the project assembly
> 3. Collected ultima.lib, then collected scummvm.exe
> 4. Added files to the project and continued to collect until the error did not jump out.
> 
> I have done these steps first for Ultima 4, then - 6. In both cases, the reason was pointer-to-member array declaration.
> Ultima 4 - https://github.com/scummvm/scummvm/blob/master/engines/ultima/ultima4/game/item.cpp#L49
> Ultima 6 - https://github.com/scummvm/scummvm/blob/master/engines/ultima/nuvie/usecode/u6_object_types.h#L28
> 
> elf2e32 creates E32 aka EPOC32 aka Symbian exe and dlls from elf.
> 
> Analysis of the elf2e32 source code indicated the reason - when checking the created file, unaligned relocations were found. After modifying the source code, the elf2e32 was printed unaligned relocations. I redirect to file "readelf -a <name of elf>". I find several random Elf32_Rel r_offset from elf2e32 in readelf output. GCC 5.4.0 and 11.2.0 give same result.
> 
> Compiler options taken from Eclipse output and they are same for every source file: arm-none-symbianelf-gcc    -O2 -fno-unit-at-a-time  -fexceptions -Wall -Wno-unknown-pragmas   -march=armv5t      -mapcs-frame -mthumb-interwork -pipe -nostdinc -c  -Wno-multichar -Wno-unused -Wno-format -fsigned-char -fno-asynchronous-unwind-tables -std=c++11 -v -pipe -Wno-multichar -Wno-reorder -Wno-unused -Wno-format -fsigned-char -Wno-psabi -marm  -msoft-float  -D__MARM_INTERWORK__   -DNDEBUG -D_UNICODE -D__GCCE__  -D__SYMBIAN32__ -D__S60_50__ -D__S60_3X__ -D__SERIES60_3X__ -D__GCCE__ -D__EPOC32__ -D__MARM__ -D__EABI__ -D__MARM_ARMV5__ -D__EXE__ -DENABLE_CGE -DENABLE_ULTIMA -DENABLE_ULTIMA6 -DS60 -DS60V3 -DSDL_BACKEND -DENABLE_VKEYBD -DUSE_TRANSLATION -DNONSTANDARD_PORT -DDISABLE_FANCY_THEMES -DUSE_A52 -DUSE_BINK -DUSE_FAAD -DUSE_FLAC -DUSE_FREETYPE2 -DUSE_JPEG -DUSE_MAD -DUSE_MPEG2 -DUSE_PNG -DUSE_THEORADEC
>   -DUSE_TREMOR -DUSE_ZLIB -D__SUPPORT_CPP_EXCEPTIONS__ -D__MARM_ARMV5__  -D__PRODUCT_INCLUDE__=\"/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/variant/Symbian_OS.hrh\"    -x c++ -Wno-ctor-dtor-privacy -fpermissive -std=c++14 -include /Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/INCLUDE/GCCE/GCCE.h  -I /Symbian/Projects/SDL/scummvm/base -I /Symbian/Projects/SDL/scummvm/engines  -I /Symbian/Projects/SDL/scummvm  -I /Symbian/Projects/SDL/scummvm/gui  -I /Symbian/Projects/SDL/scummvm/audio  -I /Symbian/Projects/SDL/scummvm/backends/platform/symbian/src -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/freetype -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/mpeg2dec -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/jpeg
>   -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/png -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/ESDL -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/ZLIB -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/libc -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/theora -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/tremor -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/site -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include -I /Symbian/Projects/SDL/scummvm/backends/platform/symbian/src -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/variant -I "d:/mingw/msys/1.0/local/gcc-11.2.0/lib/gcc/arm-none-symbianelf/11.2.0/include" -o /Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/BUILD/Symbian/Projects/SDL/scummvm/backends/platform/symbian/S60v3/NEVERHOODE/GCCE/UREL/version.o /Symbian/Projects/SDL/scummvm/base/version.cpp
> Using built-in specs.
> COLLECT_GCC=arm-none-symbianelf-gcc
> Target: arm-none-symbianelf
> Configured with: ../gcc-11.2.0/./configure --target=arm-none-symbianelf --prefix=/usr/local/gcc-11.2.0 --without-headers --enable-languages=c,c++,lto --enable-poison-system-directories --enable-lto --with-newlib --enable-long-long --with-libiconv-prefix=/usr/local --with-dwarf2 --enable-interwork --enable-tls --enable-multilib --disable-hosted-libstdcxx --disable-libstdcxx-pch --disable-option-checking --disable-threads --disable-nls --disable-win32-registry --disable-libssp --disable-shared --enable-wchar_t --enable-extra-sgxxlite-multilibs --enable-c99 --with-static-standard-libraries
> Thread model: single
> Supported LTO compression algorithms: zlib
> gcc version 11.2.0 (GCC)
> COLLECT_GCC_OPTIONS='-O2' '-fno-unit-at-a-time' '-fexceptions' '-Wall' '-Wno-unknown-pragmas'  '-mapcs-frame' '-mthumb-interwork' '-pipe' '-nostdinc' '-c' '-Wformat=0' '-fno-asynchronous-unwind-tables' '-std=c++11' '-v' '-pipe' '-Wno-multichar' '-Wno-reorder' '-Wno-unused' '-Wformat=0' '-fsigned-char' '-Wno-psabi' '-marm' '-mfloat-abi=soft' '-D' '__MARM_INTERWORK__' '-D' 'NDEBUG' '-D' '_UNICODE' '-D' '__GCCE__' '-D' '__SYMBIAN32__' '-D' '__S60_50__' '-D' '__S60_3X__' '-D' '__SERIES60_3X__' '-D' '__GCCE__' '-D' '__EPOC32__' '-D' '__MARM__' '-D' '__EABI__' '-D' '__MARM_ARMV5__' '-D' '__EXE__' '-D' 'ENABLE_CGE' '-D' 'ENABLE_ULTIMA' '-D' 'ENABLE_ULTIMA6' '-D' 'S60' '-D' 'S60V3' '-D' 'SDL_BACKEND' '-D' 'ENABLE_VKEYBD' '-D' 'USE_TRANSLATION' '-D' 'NONSTANDARD_PORT' '-D' 'DISABLE_FANCY_THEMES' '-D' 'USE_A52' '-D' 'USE_BINK' '-D' 'USE_FAAD' '-D' 'USE_FLAC' '-D' 'USE_FREETYPE2' '-D' 'USE_JPEG' '-D' 'USE_MAD' '-D' 'USE_MPEG2' '-D' 'USE_PNG' '-D' 'USE_THEORADEC'
>   '-D' 'USE_TREMOR' '-D' 'USE_ZLIB' '-D' '__SUPPORT_CPP_EXCEPTIONS__' '-D' '__MARM_ARMV5__' '-D' '__PRODUCT_INCLUDE__="/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/variant/Symbian_OS.hrh"' '-Wno-ctor-dtor-privacy' '-fpermissive' '-std=c++14' '-include' '/Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/INCLUDE/GCCE/gcce.h' '-I' '/Symbian/Projects/SDL/scummvm/base' '-I' '/Symbian/Projects/SDL/scummvm/engines' '-I' '/Symbian/Projects/SDL/scummvm' '-I' '/Symbian/Projects/SDL/scummvm/gui' '-I' '/Symbian/Projects/SDL/scummvm/audio' '-I' '/Symbian/Projects/SDL/scummvm/backends/platform/symbian/src' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/freetype' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/mpeg2dec' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/jpeg' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/png' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/esdl'
>   '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/zlib' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/libc' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/theora' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/tremor' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/site' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include' '-I' '/Symbian/Projects/SDL/scummvm/backends/platform/symbian/src' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/variant' '-I' 'd:/mingw/msys/1.0/local/gcc-11.2.0/lib/gcc/arm-none-symbianelf/11.2.0/include' '-o' '/Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/BUILD/Symbian/Projects/SDL/scummvm/backends/platform/symbian/S60v3/NEVERHOODE/GCCE/UREL/version.o' '-mlibarch=armv5t' '-march=armv5t' '-dumpdir' '/Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/BUILD/Symbian/Projects/SDL/scummvm/backends/platform/symbian/S60v3/NEVERHOODE/GCCE/UREL/'
>   d:/mingw/msys/1.0/local/gcc-11.2.0/bin/../libexec/gcc/arm-none-symbianelf/11.2.0/cc1plus.exe -quiet -nostdinc -v -I /Symbian/Projects/SDL/scummvm/base -I /Symbian/Projects/SDL/scummvm/engines -I /Symbian/Projects/SDL/scummvm -I /Symbian/Projects/SDL/scummvm/gui -I /Symbian/Projects/SDL/scummvm/audio -I /Symbian/Projects/SDL/scummvm/backends/platform/symbian/src -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/freetype -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/mpeg2dec -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/jpeg -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/png -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/esdl -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/zlib -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/libc -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/theora -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/tremor -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/site
>   -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include -I /Symbian/Projects/SDL/scummvm/backends/platform/symbian/src -I /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/variant -I d:/mingw/msys/1.0/local/gcc-11.2.0/lib/gcc/arm-none-symbianelf/11.2.0/include -iprefix d:\mingw\msys\1.0\local\gcc-11.2.0\bin\../lib/gcc/arm-none-symbianelf/11.2.0/ -D__USES_INITFINI__ -D __MARM_INTERWORK__ -D NDEBUG -D _UNICODE -D __GCCE__ -D __SYMBIAN32__ -D __S60_50__ -D __S60_3X__ -D __SERIES60_3X__ -D __GCCE__ -D __EPOC32__ -D __MARM__ -D __EABI__ -D __MARM_ARMV5__ -D __EXE__ -D ENABLE_CGE -D ENABLE_ULTIMA -D ENABLE_ULTIMA6 -D S60 -D S60V3 -D SDL_BACKEND -D ENABLE_VKEYBD -D USE_TRANSLATION -D NONSTANDARD_PORT -D DISABLE_FANCY_THEMES -D USE_A52 -D USE_BINK -D USE_FAAD -D USE_FLAC -D USE_FREETYPE2 -D USE_JPEG -D USE_MAD -D USE_MPEG2 -D USE_PNG -D USE_THEORADEC -D USE_TREMOR
>   -D USE_ZLIB -D __SUPPORT_CPP_EXCEPTIONS__ -D __MARM_ARMV5__ -D __PRODUCT_INCLUDE__="/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/variant/Symbian_OS.hrh" -include /Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/INCLUDE/GCCE/gcce.h /Symbian/Projects/SDL/scummvm/base/version.cpp -fno-builtin -fvisibility=hidden -fno-short-enums -fshort-wchar -quiet -dumpdir /Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/BUILD/Symbian/Projects/SDL/scummvm/backends/platform/symbian/S60v3/NEVERHOODE/GCCE/UREL/ -dumpbase version.cpp -dumpbase-ext .cpp -mapcs-frame -mthumb-interwork -marm -mfloat-abi=soft -mlibarch=armv5t -march=armv5t -O2 -Wall -Wno-unknown-pragmas -Wformat=0 -Wno-multichar -Wno-reorder -Wno-unused -Wformat=0 -Wno-psabi -Wno-ctor-dtor-privacy -std=c++11 -std=c++14 -version -fno-unit-at-a-time -fexceptions -fno-asynchronous-unwind-tables -fsigned-char -fpermissive -fno-builtin -fvisibility=hidden -fno-short-enums -fshort-wchar -o - |
>   d:/mingw/msys/1.0/local/gcc-11.2.0/bin/../lib/gcc/arm-none-symbianelf/11.2.0/../../../../arm-none-symbianelf/bin/as.exe -march=armv5t -mapcs-frame -mfpu=vfp -mthumb-interwork -mfloat-abi=soft -meabi=5 -o /Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/BUILD/Symbian/Projects/SDL/scummvm/backends/platform/symbian/S60v3/NEVERHOODE/GCCE/UREL/version.o
> GNU C++14 (GCC) version 11.2.0 (arm-none-symbianelf)
> 	compiled by GNU C version 6.3.0, GMP version 6.1.0, MPFR version 4.1.0, MPC version 1.2.1, isl version isl-0.16.1-GMP
> 
> GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
> ignoring duplicate directory "/Symbian/Projects/SDL/scummvm/backends/platform/symbian/src"
> #include "..." search starts here:
> #include <...> search starts here:
>   /Symbian/Projects/SDL/scummvm/base
>   /Symbian/Projects/SDL/scummvm/engines
>   /Symbian/Projects/SDL/scummvm
>   /Symbian/Projects/SDL/scummvm/gui
>   /Symbian/Projects/SDL/scummvm/audio
>   /Symbian/Projects/SDL/scummvm/backends/platform/symbian/src
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/freetype
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/mpeg2dec
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/jpeg
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/png
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/esdl
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/zlib
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/libc
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/theora
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/tremor
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/site
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include
>   /Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/variant
>   d:/mingw/msys/1.0/local/gcc-11.2.0/lib/gcc/arm-none-symbianelf/11.2.0/include
> End of search list.
> GNU C++14 (GCC) version 11.2.0 (arm-none-symbianelf)
> 	compiled by GNU C version 6.3.0, GMP version 6.1.0, MPFR version 4.1.0, MPC version 1.2.1, isl version isl-0.16.1-GMP
> 
> GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
> Compiler executable checksum: 7bd26c26f5e3795062462f9efc696d4f
> COMPILER_PATH=d:/mingw/msys/1.0/local/gcc-11.2.0/bin/../libexec/gcc/arm-none-symbianelf/11.2.0/;d:/mingw/msys/1.0/local/gcc-11.2.0/bin/../libexec/gcc/;d:/mingw/msys/1.0/local/gcc-11.2.0/bin/../lib/gcc/arm-none-symbianelf/11.2.0/../../../../arm-none-symbianelf/bin/
> LIBRARY_PATH=d:/mingw/msys/1.0/local/gcc-11.2.0/bin/../lib/gcc/arm-none-symbianelf/11.2.0/;d:/mingw/msys/1.0/local/gcc-11.2.0/bin/../lib/gcc/;d:/mingw/msys/1.0/local/gcc-11.2.0/bin/../lib/gcc/arm-none-symbianelf/11.2.0/../../../../arm-none-symbianelf/lib/
> COLLECT_GCC_OPTIONS='-O2' '-fno-unit-at-a-time' '-fexceptions' '-Wall' '-Wno-unknown-pragmas'  '-mapcs-frame' '-mthumb-interwork' '-pipe' '-nostdinc' '-c' '-Wformat=0' '-fno-asynchronous-unwind-tables' '-std=c++11' '-v' '-pipe' '-Wno-multichar' '-Wno-reorder' '-Wno-unused' '-Wformat=0' '-fsigned-char' '-Wno-psabi' '-marm' '-mfloat-abi=soft' '-D' '__MARM_INTERWORK__' '-D' 'NDEBUG' '-D' '_UNICODE' '-D' '__GCCE__' '-D' '__SYMBIAN32__' '-D' '__S60_50__' '-D' '__S60_3X__' '-D' '__SERIES60_3X__' '-D' '__GCCE__' '-D' '__EPOC32__' '-D' '__MARM__' '-D' '__EABI__' '-D' '__MARM_ARMV5__' '-D' '__EXE__' '-D' 'ENABLE_CGE' '-D' 'ENABLE_ULTIMA' '-D' 'ENABLE_ULTIMA6' '-D' 'S60' '-D' 'S60V3' '-D' 'SDL_BACKEND' '-D' 'ENABLE_VKEYBD' '-D' 'USE_TRANSLATION' '-D' 'NONSTANDARD_PORT' '-D' 'DISABLE_FANCY_THEMES' '-D' 'USE_A52' '-D' 'USE_BINK' '-D' 'USE_FAAD' '-D' 'USE_FLAC' '-D' 'USE_FREETYPE2' '-D' 'USE_JPEG' '-D' 'USE_MAD' '-D' 'USE_MPEG2' '-D' 'USE_PNG'
>   '-D' 'USE_THEORADEC' '-D' 'USE_TREMOR' '-D' 'USE_ZLIB' '-D' '__SUPPORT_CPP_EXCEPTIONS__' '-D' '__MARM_ARMV5__' '-D' '__PRODUCT_INCLUDE__="/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/variant/Symbian_OS.hrh"' '-Wno-ctor-dtor-privacy' '-fpermissive' '-std=c++14' '-include' '/Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/INCLUDE/GCCE/gcce.h' '-I' '/Symbian/Projects/SDL/scummvm/base' '-I' '/Symbian/Projects/SDL/scummvm/engines' '-I' '/Symbian/Projects/SDL/scummvm' '-I' '/Symbian/Projects/SDL/scummvm/gui' '-I' '/Symbian/Projects/SDL/scummvm/audio' '-I' '/Symbian/Projects/SDL/scummvm/backends/platform/symbian/src' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/freetype' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/mpeg2dec' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/jpeg' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/png'
>   '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/esdl' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/zlib' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/libc' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/theora' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/tremor' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/site' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include' '-I' '/Symbian/Projects/SDL/scummvm/backends/platform/symbian/src' '-I' '/Symbian/S60_5th_Edition_SDK_v1.0/epoc32/include/variant' '-I' 'd:/mingw/msys/1.0/local/gcc-11.2.0/lib/gcc/arm-none-symbianelf/11.2.0/include' '-o' '/Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/BUILD/Symbian/Projects/SDL/scummvm/backends/platform/symbian/S60v3/NEVERHOODE/GCCE/UREL/version.o' '-mlibarch=armv5t' '-march=armv5t' '-dumpdir' '/Symbian/S60_5th_Edition_SDK_v1.0/EPOC32/BUILD/Symbian/Projects/SDL/scummvm/backends/platform/symbian/S60v3/NEVERHOODE/GCCE/UREL/version.'
> 

I can't tell from this what the issue might be.  To stand any chance of 
proceeding further, I think we're going to need a simple, 
self-contained, testcase that can demonstrate the problem.

I don't think I've seen a question about SymbianOS support in over 5 
years, now, possibly longer.  Given that SymbianOS itself was 
discontinued back around 2013 (8 years ago now), the GCC port has 
declined to the point where I suspect it's likely to get deprecated 
soon, due to lack of maintenance.

R.