ld: Enable elf32loongarch as extra target for elf64loongarch
The patch allows building GCC with multilib support for LoongArch without needing `--enable-targets=all` in the binutils configuration.
This patch modifies the linker configuration to allow building GCC with multilib support for LoongArch, even when binutils isn’t configured with --enable-targets=all. It adds elf32loongarch as an extra target for elf64loongarch and vice versa. This simplifies the build process for developers working with LoongArch multilib configurations by avoiding the need to build all possible targets.
- proposer
Proposes enabling elf32loongarch as an extra target for elf64loongarch and vice versa to allow building GCC with multilib support without `--enable-targets=all`.
“Allow people to build GCC with multilib support even without --enable-targets=all in binutils configuration.”
- other
Acknowledges the patch.
Technical Tradeoffs
- May increase linker complexity slightly.
- Potentially increases the size of the linker binary.
- Reduces the need for building all targets, saving build time and disk space.
In Details
This patch modifies ld's target configuration to allow cross-linking between LoongArch's 32-bit (elf32loongarch) and 64-bit (elf64loongarch) ABIs. It achieves this by adding each ABI to the other's targ_extra_libpath. This avoids needing --enable-targets=all in binutils, which can be cumbersome. This change affects how the linker searches for libraries when building multilib-enabled toolchains.
For Context
The GNU linker (ld) is a program that combines object files into an executable or library. Binutils is a collection of binary tools, including the linker, assembler, and other utilities. Multilib refers to the ability to build a single toolchain that can target multiple ABIs (Application Binary Interfaces), such as 32-bit and 64-bit versions of the same architecture. LoongArch is a RISC instruction set architecture. This patch simplifies the process of building a GCC toolchain that can target both 32-bit and 64-bit LoongArch systems.