https://gcc.gnu.org/g:dd3ffd00892d6e43621eab29c84741243f03e11e
commit dd3ffd00892d6e43621eab29c84741243f03e11e Author: Olivier Hainque <[email protected]> Date: Fri Oct 24 14:32:51 2025 -0300 Introduce x86_64-linux-gnum32 Enable a 32-bit "native" toolchain to be built on x86_64-linux-gnu, i.e., one that targets -m32 despite running in 64-bit mode. Neither multilibs nor -m64 support are desired for this configuration (a multilibbed x86_64-linux-gnu native, defaulting to -m32 through self specs would accomplish those). for gcc/ChangeLog * config.gcc [x86_64-*-*]: Match *m32 target, default to m32 abi and multilib. Accept 32 or m32 for --with-abi. Diff: --- gcc/config.gcc | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/gcc/config.gcc b/gcc/config.gcc index c678b801f705..8d96ef00005a 100644 --- a/gcc/config.gcc +++ b/gcc/config.gcc @@ -676,6 +676,29 @@ i[34567]86-*-*) x86_64-*-darwin*) ;; x86_64-*-*) + # Pick a default with_abi and with_multilib_list for m32 + # restricted toolchains + case ${target} in + *m32) + case ${with_abi} in + "" | 32 | m32) + with_abi=m32 + ;; + *) + echo "Invalid --with-abi=$with_abi for m32 target" + exit 1 + esac + case ${with_multilib_list} in + default | m32) + with_multilib_list=m32 + ;; + *) + echo "Invalid multilib list for m32 target" + exit 1 + esac + ;; + esac + case ${with_abi} in "") if test "x$with_multilib_list" = xmx32; then @@ -690,6 +713,8 @@ x86_64-*-*) x32 | mx32) tm_file="i386/biarchx32.h ${tm_file}" ;; + 32 | m32) + ;; *) echo "Unknown ABI used in --with-abi=$with_abi" exit 1
