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Questions tagged [binutils]

The GNU binary utilities. A collection of tools for operating on object files. Most notably they include the GNU assembler and linker. They are typically used in conjunction with the GNU compiler collection (GCC).

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Why does the -r option (relocatable) make ld not find any libraries?

Running Debian/Linux x86_64 with GNU ld 2.21. Quite simply, if I link with ld -o main main.o /usr/lib/crti.o /usr/lib/crt1.o /usr/lib/crtn.o -lc -lm It works, but when I link with ld -r -o main1.o main.o /usr/lib/crti.o /usr/lib/crt1.o…
Jeremy Salwen
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What does SEGMENT_START("text-segment", 0x400000) represent?

I'm learning about the layout of executable binaries. My end goal is to analyze a specific executable for things that could be refactored (in its source) to reduce the compiled output size. I've been using…
StoneThrow
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Symbol versioning on Alpine Linux

The musl C library has only an approximative implementation of symbol versioning. This can result in symbols being bound together that have different symbol versions, something which would not happen in a full implementation. Projects which expect…
Florian Weimer
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Linking 32- and 64-bit code together into a single binary

In a comment to this question, Unexpected behaviour in simple pointer arithmetics in kernel space C code, Michael Petch wrote, "The 64-bit ELF format supports 32-bit code sections." I have a working program that includes both 32- and 64-bit code and…
prl
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Generating link-time error for deprecated functions

Is there a way with gcc and GNU binutils to mark some functions such that they will generate an error at link-time if used? My situation is that I have some library functions which I am not removing for the sake of compatibility with existing…
R.. GitHub STOP HELPING ICE
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How to see the GNU debuglink value of an ELF file?

So I can add a link to a debug symbol file like this objcopy --add-gnu-debuglink=$name.dbg $name, but how can I later retrieve that value again? I checked with readelf -a and grepped for \.dbg without any luck. Similarly I checked the with objdump…
0xC0000022L
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What configure options were used when building binutils?

I have a version of binutils that was compiled by someone. I need recompile a new binutils with same options. I know that gcc -v prints out the configuration options. So maybe there is any way to read build options for binutils?
Valeriy Solovyov
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Different symbols from glibc/pthreads used when using gold vs ld linker

I have a simple test program calling pthread_cond_broadcast. When linked with the ld linker, this shows: Case 1: $ nm ld-test | grep cond_broadcast U pthread_cond_broadcast@@GLIBC_2.3.2 When linked with the gold linker it shows: Case 2: $ nm…
binary01
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objdump not working on ELF 64-bit x86-64,

I have a 64bits ELF object code from the Tiny C compiler. I can't get gobjdump to show the disassembled code. I'm using OS X 10.10.5. $ file hello.o hello.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped $ gobjdump -d…
Nawal
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binutils and gcc with LTO

I have binutils-2.25.1 installed to /usr/local/binutils-2.25.1, configured with ../configure --prefix=/usr/local/binutils-2.25.1 --enable-plugins --enable-gold --disable-werror And I want to build RPM package - gcc with LTO support that uses linker…
artshmelev
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Various representations of -Bstatic flags in ld

In manpage of ld (from binutils), there is this section about variations of -Bstatic flag: -Bstatic -dn -non_shared -static Do not link against shared libraries. This is only meaningful on platforms for which shared libraries are…
Abel Cheung
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How to hook ALL linux system calls during a binary execution

I am trying to modify linux system call's default behavior. At the moment I am trying to hook and add a simple print statement before they are actually getting invoked. I know about the standard 'wrap' option of GCC linker and how it can be used to…
Sandhya Kumar
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Dynamic loading of shared objects using dlopen()

I'm working on a plain X11 app. By default, my app only requires libX11.so and the standard gcc C and math libs. The App can extend features with Xfixes, Xrender and ALSA sound system. However, these (Xfixes, Xrender and ALSA) feature are…
Andy
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How to find global static initializations

I just read this excellent article: http://neugierig.org/software/chromium/notes/2011/08/static-initializers.html and then I tried: https://gcc.gnu.org/onlinedocs/gccint/Initialization.html What it says about finding initializers does not work for…
milianw
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Copying an ELF section between object files with binutils

Due to a bug in ld I need to copy an ELF section from one object file to another. I can dump the desired section to a file but the problem is that objcopy's --add-section option expects a binary file and the section type information is therefore…
Per Knytt
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