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feat: x86_64-montauk userspace cross toolchain

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Add build-montauk-toolchain.sh: builds an OS-aware cross GCC/binutils
(same versions and prefix as the bare-metal x86_64-elf toolchain) whose
x86_64-montauk target links static ET_EXEC binaries against the Montauk
libc sysroot with no special flags: 4 KiB max page size for the kernel
ELF loader, -mno-red-zone by default, crt1/crti/crtn + -lc from the
sysroot, __montauk__ defined. Target patches are checked into
toolchain/patches/, the GCC target header into toolchain/files/.

sys/types.h now includes <stdint.h> so hosted code (libgcov and
friends) sees intptr_t via the stdio include chain.

Co-Authored-By: Claude Fable 5 <[email protected]>
This commit is contained in:
daniel
2026-07-14 10:19:35 +02:00
co-authored by Claude Fable 5
parent 182520a585
commit 778f897f1a
7 changed files with 404 additions and 0 deletions
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toolchain/patches/binutils-2.43.1-montauk.patch
+47
View File
@@ -0,0 +1,47 @@
--- a/config.sub
+++ b/config.sub
@@ -1768,7 +1768,7 @@
| onefs* | tirtos* | phoenix* | fuchsia* | redox* | bme* \
| midnightbsd* | amdhsa* | unleashed* | emscripten* | wasi* \
| nsk* | powerunix* | genode* | zvmoe* | qnx* | emx* | zephyr* \
- | fiwix* | mlibc* | cos* | mbr* | ironclad* )
+ | fiwix* | mlibc* | cos* | mbr* | ironclad* | montauk* )
;;
# This one is extra strict with allowed versions
sco3.2v2 | sco3.2v[4-9]* | sco5v6*)
--- a/bfd/config.bfd
+++ b/bfd/config.bfd
@@ -681,6 +681,11 @@
targ_selvecs="i386_elf32_vec iamcu_elf32_vec"
want64=true
;;
+ x86_64-*-montauk*)
+ targ_defvec=x86_64_elf64_vec
+ targ_selvecs=i386_elf32_vec
+ want64=true
+ ;;
x86_64-*-elf* | x86_64-*-rtems* | x86_64-*-fuchsia | x86_64-*-genode*)
targ_defvec=x86_64_elf64_vec
targ_selvecs="i386_elf32_vec iamcu_elf32_vec x86_64_elf32_vec"
--- a/gas/configure.tgt
+++ b/gas/configure.tgt
@@ -229,6 +229,7 @@
i386-*-beos*) fmt=elf ;;
i386-*-elfiamcu) fmt=elf arch=iamcu ;;
i386-*-elf*) fmt=elf ;;
+ i386-*-montauk*) fmt=elf ;;
i386-*-fuchsia*) fmt=elf ;;
i386-*-haiku*) fmt=elf em=haiku ;;
i386-*-genode*) fmt=elf ;;
--- a/ld/configure.tgt
+++ b/ld/configure.tgt
@@ -1036,6 +1036,9 @@
tdir_elf_i386=`echo ${targ_alias} | \
sed -e 's/x86_64/i386/' -e 's/aout//'`
;;
+x86_64-*-montauk*) targ_emul=elf_x86_64
+ targ_extra_emuls=elf_i386
+ ;;
x86_64-*-elf* | x86_64-*-rtems* | x86_64-*-fuchsia* | x86_64-*-genode*)
targ_emul=elf_x86_64
targ_extra_emuls="elf_i386 elf_iamcu elf32_x86_64"