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52 lines
2.1 KiB
Markdown
52 lines
2.1 KiB
Markdown
+++
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title = "Cross Compile Binutils"
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template = "plain.html"
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url = "cross-compile-binutils"
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order = 2
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The [GNU Binutils] are a collection of various binary tools such as `ld`, `as`, `objdump`, or `readelf`. These tools are platform-specific, so you need to compile them again if your host system and target system are different. In our case, we need `ld` and `objdump` for the x86_64 architecture.
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[GNU Binutils]: https://www.gnu.org/software/binutils/
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## Building Setup
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First, you need to download a current binutils version from [here][download] \(the latest one is near the bottom). After extracting, you should have a folder named `binutils-2.X` where `X` is for example `25.1`. Now can create and switch to a new folder for building (recommended):
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[download]: ftp://sourceware.org/pub/binutils/snapshots
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```bash
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mkdir build-binutils
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cd build-binutils
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```
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## Configuration
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We execute binutils's `configure` and pass a lot of arguments to it (replace the `X` with the version number):
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```bash
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../binutils-2.X/configure --target=x86_64-elf --prefix="$HOME/opt/cross" \
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--disable-nls --disable-werror \
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--disable-gdb --disable-libdecnumber --disable-readline --disable-sim
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```
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- The `target` argument specifies the the x86_64 target architecture.
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- The `prefix` argument selects the installation directory, you can change it if you like. But be careful that you do not overwrite your system's binutils.
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- The `disable-nls` flag disables native language support (so you'll get the same english error messages). It also reduces build dependencies.
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- The `disable-werror` turns all warnings into errors.
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- The last line disables features we don't need to reduce compile time.
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## Building it
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Now we can build and install it to the location supplied as `prefix` (it will take a while):
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```bash
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make
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make install
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```
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Now you should have multiple `x86_64-elf-XXX` files in `$HOME/opt/cross/bin`.
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## Adding it to the PATH
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To use the tools from the command line easily, you should add the `bin` folder to your PATH:
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```bash
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export PATH="$HOME/opt/cross/bin:$PATH"
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```
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If you add this line to your e.g. `.bashrc`, the `x86_64-elf-XXX` commands are always available.
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