Hi,
On an `Ubuntu 24.04`, using the default `GCC-13.2` compiler I compiled
a source file with `-fPIC` option to produce relocatable binary:
/usr/bin/c++ -v -DBPFTIME_BUILD_WITH_LIBBPF=1 -DSPDLOG_COMPILED_LIB
-Dbpftime_text_segment_transformer_EXPORTS
-I/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum
-I/home/ahmad/Programs/bpftime/third_party/spdlog/include
-fno-omit-frame-pointer -O3 -DNDEBUG -std=gnu++20 -fPIC -o
text_segment_transformer.cpp.o -c
/home/ahmad/Programs/bpftime/attach/text_segment_transformer/text_segment_transformer.cpp
The compiler output is as follows:
Using built-in specs.
COLLECT_GCC=/usr/bin/c++
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
13.2.0-23ubuntu4'
--with-bugurl=file:///usr/share/doc/gcc-13/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2
--prefix=/usr --with-gcc-major-version-only --program-suffix=-13
--program-prefix=x86_64-linux-gnu- --enable-shared
--enable-linker-build-id --libexecdir=/usr/libexec
--without-included-gettext --enable-threads=posix --libdir=/usr/lib
--enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-libstdcxx-backtrace --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie
--with-system-zlib --enable-libphobos-checking=release
--with-target-system-zlib=auto --enable-objc-gc=auto
--enable-multiarch --disable-werror --enable-cet --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib
--with-tune=generic
--enable-offload-targets=nvptx-none=/build/gcc-13-uJ7kn6/gcc-13-13.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-13-uJ7kn6/gcc-13-13.2.0/debian/tmp-gcn/usr
--enable-offload-defaulted --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.2.0 (Ubuntu 13.2.0-23ubuntu4)
COLLECT_GCC_OPTIONS='-v' '-D' 'BPFTIME_BUILD_WITH_LIBBPF=1' '-D'
'SPDLOG_COMPILED_LIB' '-D' 'bpftime_text_segment_transformer_EXPORTS'
'-I' '/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum'
'-I' '/home/ahmad/Programs/bpftime/third_party/spdlog/include'
'-fno-omit-frame-pointer' '-O3' '-D' 'NDEBUG' '-std=gnu++20' '-fPIC'
'-o' 'text_segment_transformer.cpp.o' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/usr/libexec/gcc/x86_64-linux-gnu/13/cc1plus -quiet -v -I
/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum
-I /home/ahmad/Programs/bpftime/third_party/spdlog/include -imultiarch
x86_64-linux-gnu -D_GNU_SOURCE -D BPFTIME_BUILD_WITH_LIBBPF=1 -D
SPDLOG_COMPILED_LIB -D bpftime_text_segment_transformer_EXPORTS -D
NDEBUG /home/ahmad/Programs/bpftime/attach/text_segment_transformer/text_segment_transformer.cpp
-D_FORTIFY_SOURCE=3 -quiet -dumpbase text_segment_transformer.cpp.cpp
-dumpbase-ext .cpp -mtune=generic -march=x86-64 -O3 -std=gnu++20
-version -fno-omit-frame-pointer -fPIC -fasynchronous-unwind-tables
-fstack-protector-strong -Wformat -Wformat-security
-fstack-clash-protection -fcf-protection -o /tmp/ccrIb4z5.s
GNU C++20 (Ubuntu 13.2.0-23ubuntu4) version 13.2.0 (x86_64-linux-gnu)
compiled by GNU C version 13.2.0, GMP version 6.3.0, MPFR
version 4.2.1, MPC version 1.3.1, isl version isl-0.26-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/13"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/13/include-fixed/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/13/include-fixed"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum
/home/ahmad/Programs/bpftime/third_party/spdlog/include
/usr/include/c++/13
/usr/include/x86_64-linux-gnu/c++/13
/usr/include/c++/13/backward
/usr/lib/gcc/x86_64-linux-gnu/13/include
/usr/local/include
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
Compiler executable checksum: 4e0f319cd9945d8f5a9eeeeec1481ba5
In file included from /usr/include/c++/13/string:51,
from /usr/include/c++/13/bits/locale_classes.h:40,
from /usr/include/c++/13/bits/ios_base.h:41,
from /usr/include/c++/13/ios:44,
from /usr/include/c++/13/istream:40,
from /usr/include/c++/13/sstream:40,
from /usr/include/c++/13/chrono:45,
from
/home/ahmad/Programs/bpftime/third_party/spdlog/include/spdlog/common.h:10,
from
/home/ahmad/Programs/bpftime/third_party/spdlog/include/spdlog/spdlog.h:12,
from
/home/ahmad/Programs/bpftime/attach/text_segment_transformer/text_segment_transformer.cpp:1:
In static member function ‘static constexpr _Up*
std::__copy_move<_IsMove, true,
std::random_access_iterator_tag>::__copy_m(_Tp*, _Tp*, _Up*) [with _Tp
= unsigned char; _Up = unsigned char; bool _IsMove = false]’,
inlined from ‘constexpr _OI std::__copy_move_a2(_II, _II, _OI)
[with bool _IsMove = false; _II = unsigned char*; _OI = unsigned
char*]’ at /usr/include/c++/13/bits/stl_algobase.h:506:30,
inlined from ‘constexpr _OI std::__copy_move_a1(_II, _II, _OI)
[with bool _IsMove = false; _II = unsigned char*; _OI = unsigned
char*]’ at /usr/include/c++/13/bits/stl_algobase.h:533:42,
inlined from ‘constexpr _OI std::__copy_move_a(_II, _II, _OI)
[with bool _IsMove = false; _II =
__gnu_cxx::__normal_iterator<unsigned char*, vector<unsigned char> >;
_OI = unsigned char*]’ at
/usr/include/c++/13/bits/stl_algobase.h:540:31,
inlined from ‘constexpr _OI std::copy(_II, _II, _OI) [with _II =
__gnu_cxx::__normal_iterator<unsigned char*, vector<unsigned char> >;
_OI = unsigned char*]’ at
/usr/include/c++/13/bits/stl_algobase.h:633:7,
inlined from ‘void bpftime::setup_syscall_tracer()’ at
/home/ahmad/Programs/bpftime/attach/text_segment_transformer/text_segment_transformer.cpp:235:11:
/usr/include/c++/13/bits/stl_algobase.h:437:30: warning: ‘void*
__builtin_memmove(void*, const void*, long unsigned int)’ writing
between 2 and 9223372036854775807 bytes into a region of size 0
overflows the destination [-Wstringop-overflow=]
437 | __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘void bpftime::setup_syscall_tracer()’:
cc1plus: note: destination object is likely at address zero
COLLECT_GCC_OPTIONS='-v' '-D' 'BPFTIME_BUILD_WITH_LIBBPF=1' '-D'
'SPDLOG_COMPILED_LIB' '-D' 'bpftime_text_segment_transformer_EXPORTS'
'-I' '/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum'
'-I' '/home/ahmad/Programs/bpftime/third_party/spdlog/include'
'-fno-omit-frame-pointer' '-O3' '-D' 'NDEBUG' '-std=gnu++20' '-fPIC'
'-o' 'text_segment_transformer.cpp.o' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
as -v -I /home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum
-I /home/ahmad/Programs/bpftime/third_party/spdlog/include --64 -o
text_segment_transformer.cpp.o /tmp/ccrIb4z5.s
GNU assembler version 2.42 (x86_64-linux-gnu) using BFD version (GNU
Binutils for Ubuntu) 2.42
COMPILER_PATH=/usr/libexec/gcc/x86_64-linux-gnu/13/:/usr/libexec/gcc/x86_64-linux-gnu/13/:/usr/libexec/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/13/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/13/:/usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/13/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/13/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-D' 'BPFTIME_BUILD_WITH_LIBBPF=1' '-D'
'SPDLOG_COMPILED_LIB' '-D' 'bpftime_text_segment_transformer_EXPORTS'
'-I' '/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum'
'-I' '/home/ahmad/Programs/bpftime/third_party/spdlog/include'
'-fno-omit-frame-pointer' '-O3' '-D' 'NDEBUG' '-std=gnu++20' '-fPIC'
'-o' 'text_segment_transformer.cpp.o' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64' '-dumpdir'
'text_segment_transformer.cpp.'
The symbol `syscall_hooker_cxx` has relocation type `R_X86_64_PLT32`.
The same command On an `Ubuntu 18.04` using a manually built
`GCC-13.2` compiler causes the following output:
Using built-in specs.
COLLECT_GCC=/usr/bin/c++
Target: x86_64-linux-gnu
Configured with: ../configure --prefix=/opt/gcc-13.2.0
--disable-multilib --enable-shared --enable-linker-build-id
--without-included-gettext --enable-threads=posix --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-libstdcxx-backtrace --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie
--with-system-zlib --enable-libphobos-checking=release
--with-target-system-zlib=auto --enable-objc-gc=auto --disable-werror
--enable-cet --with-arch-32=i686 --with-abi=m64 --with-tune=generic
--without-cuda-driver --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.2.0 (GCC)
COLLECT_GCC_OPTIONS='-v' '-D' 'BPFTIME_BUILD_WITH_LIBBPF=1' '-D'
'SPDLOG_COMPILED_LIB' '-D' 'bpftime_text_segment_transformer_EXPORTS'
'-I' '/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum'
'-I' '/home/ahmad/Programs/bpftime/third_party/spdlog/include'
'-fno-omit-frame-pointer' '-O3' '-D' 'NDEBUG' '-std=gnu++20' '-fPIC'
'-o' 'text_segment_transformer.cpp.o' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/opt/gcc-13.2.0/libexec/gcc/x86_64-linux-gnu/13.2.0/cc1plus -quiet -v
-I /home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum
-I /home/ahmad/Programs/bpftime/third_party/spdlog/include -imultiarch
x86_64-linux-gnu -D_GNU_SOURCE -D BPFTIME_BUILD_WITH_LIBBPF=1 -D
SPDLOG_COMPILED_LIB -D bpftime_text_segment_transformer_EXPORTS -D
NDEBUG /home/ahmad/Programs/bpftime/attach/text_segment_transformer/text_segment_transformer.cpp
-quiet -dumpbase text_segment_transformer.cpp.cpp -dumpbase-ext .cpp
-mtune=generic -march=x86-64 -O3 -std=gnu++20 -version
-fno-omit-frame-pointer -fPIC -o /tmp/ccIXuruA.s
GNU C++20 (GCC) version 13.2.0 (x86_64-linux-gnu)
compiled by GNU C version 13.2.0, GMP version 6.3.0, MPFR version
4.2.1, MPC version 1.3.1, isl version none
warning: GMP header version 6.3.0 differs from library version 6.1.2.
warning: MPFR header version 4.2.1 differs from library version 4.0.1.
warning: MPC header version 1.3.1 differs from library version 1.1.0.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum
/home/ahmad/Programs/bpftime/third_party/spdlog/include
/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/../../../../include/c++/13.2.0
/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/../../../../include/c++/13.2.0/x86_64-linux-gnu
/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/../../../../include/c++/13.2.0/backward
/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/include
/usr/local/include
/opt/gcc-13.2.0/include
/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/include-fixed/x86_64-linux-gnu
/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
Compiler executable checksum: 57ec4216d92497ddefc5d01c6cd03e37
In file included from /opt/gcc-13.2.0/include/c++/13.2.0/string:51,
from
/opt/gcc-13.2.0/include/c++/13.2.0/bits/locale_classes.h:40,
from /opt/gcc-13.2.0/include/c++/13.2.0/bits/ios_base.h:41,
from /opt/gcc-13.2.0/include/c++/13.2.0/ios:44,
from /opt/gcc-13.2.0/include/c++/13.2.0/istream:40,
from /opt/gcc-13.2.0/include/c++/13.2.0/sstream:40,
from /opt/gcc-13.2.0/include/c++/13.2.0/chrono:45,
from
/home/ahmad/Programs/bpftime/third_party/spdlog/include/spdlog/common.h:10,
from
/home/ahmad/Programs/bpftime/third_party/spdlog/include/spdlog/spdlog.h:12,
from
/home/ahmad/Programs/bpftime/attach/text_segment_transformer/text_segment_transformer.cpp:1:
In static member function ‘static constexpr _Up*
std::__copy_move<_IsMove, true,
std::random_access_iterator_tag>::__copy_m(_Tp*, _Tp*, _Up*) [with _Tp
= unsigned char; _Up = unsigned char; bool _IsMove = false]’,
inlined from ‘constexpr _OI std::__copy_move_a2(_II, _II, _OI)
[with bool _IsMove = false; _II = unsigned char*; _OI = unsigned
char*]’ at /opt/gcc-13.2.0/include/c++/13.2.0/bits/stl_algobase.h:506:30,
inlined from ‘constexpr _OI std::__copy_move_a1(_II, _II, _OI)
[with bool _IsMove = false; _II = unsigned char*; _OI = unsigned
char*]’ at /opt/gcc-13.2.0/include/c++/13.2.0/bits/stl_algobase.h:533:42,
inlined from ‘constexpr _OI std::__copy_move_a(_II, _II, _OI)
[with bool _IsMove = false; _II =
__gnu_cxx::__normal_iterator<unsigned char*, vector<unsigned char> >;
_OI = unsigned char*]’ at
/opt/gcc-13.2.0/include/c++/13.2.0/bits/stl_algobase.h:540:31,
inlined from ‘constexpr _OI std::copy(_II, _II, _OI) [with _II =
__gnu_cxx::__normal_iterator<unsigned char*, vector<unsigned char> >;
_OI = unsigned char*]’ at
/opt/gcc-13.2.0/include/c++/13.2.0/bits/stl_algobase.h:633:7,
inlined from ‘void bpftime::setup_syscall_tracer()’ at
/home/ahmad/Programs/bpftime/attach/text_segment_transformer/text_segment_transformer.cpp:235:11:
/opt/gcc-13.2.0/include/c++/13.2.0/bits/stl_algobase.h:437:30:
warning: ‘void* __builtin_memmove(void*, const void*, long unsigned
int)’ writing between 2 and 9223372036854775807 bytes into a region of
size 0 overflows the destination [-Wstringop-overflow=]
437 | __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘void bpftime::setup_syscall_tracer()’:
cc1plus: note: destination object is likely at address zero
COLLECT_GCC_OPTIONS='-v' '-D' 'BPFTIME_BUILD_WITH_LIBBPF=1' '-D'
'SPDLOG_COMPILED_LIB' '-D' 'bpftime_text_segment_transformer_EXPORTS'
'-I' '/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum'
'-I' '/home/ahmad/Programs/bpftime/third_party/spdlog/include'
'-fno-omit-frame-pointer' '-O3' '-D' 'NDEBUG' '-std=gnu++20' '-fPIC'
'-o' 'text_segment_transformer.cpp.o' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
as -v -I /home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum
-I /home/ahmad/Programs/bpftime/third_party/spdlog/include --64 -o
text_segment_transformer.cpp.o /tmp/ccIXuruA.s
GNU assembler version 2.30 (x86_64-linux-gnu) using BFD version (GNU
Binutils for Ubuntu) 2.30
COMPILER_PATH=/opt/gcc-13.2.0/libexec/gcc/x86_64-linux-gnu/13.2.0/:/opt/gcc-13.2.0/libexec/gcc/x86_64-linux-gnu/13.2.0/:/opt/gcc-13.2.0/libexec/gcc/x86_64-linux-gnu/:/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/:/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/:/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/../../../../lib64/:/lib/x86_64-linux-gnu/:/lib/../lib64/:/usr/lib/x86_64-linux-gnu/:/opt/gcc-13.2.0/lib/gcc/x86_64-linux-gnu/13.2.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-D' 'BPFTIME_BUILD_WITH_LIBBPF=1' '-D'
'SPDLOG_COMPILED_LIB' '-D' 'bpftime_text_segment_transformer_EXPORTS'
'-I' '/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum'
'-I' '/home/ahmad/Programs/bpftime/third_party/spdlog/include'
'-fno-omit-frame-pointer' '-O3' '-D' 'NDEBUG' '-std=gnu++20' '-fPIC'
'-o' 'text_segment_transformer.cpp.o' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64' '-dumpdir'
'text_segment_transformer.cpp.'
But this time the relocation type for `syscall_hooker_cxx` is
`R_X86_64_PC32`. What could be the cause of this inconsistency? Is the
latter GCC configured incorrectly (Also, the default `GLIBC` version
used by the former `GCC` is `2.39` while for the latter is `2.27`)?
Any hint is appreciated.
Regards.
