feat: x86_64-montauk userspace cross toolchain

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]>
2026-07-14 10:19:35 +02:00
parent 182520a585
commit 778f897f1a
7 changed files with 404 additions and 0 deletions
@@ -0,0 +1,49 @@
+--- a/config.sub
+++ b/config.sub
+@@ -1749,7 +1749,7 @@
+ 	     | onefs* | tirtos* | phoenix* | fuchsia* | redox* | bme* \
+ 	     | midnightbsd* | amdhsa* | unleashed* | emscripten* | wasi* \
+ 	     | nsk* | powerunix* | genode* | zvmoe* | qnx* | emx* | zephyr* \
+-	     | fiwix* )
+	     | fiwix* | montauk* )
+ 		;;
+ 	# This one is extra strict with allowed versions
+ 	sco3.2v2 | sco3.2v[4-9]* | sco5v6*)
+--- a/gcc/config.gcc
+++ b/gcc/config.gcc
+@@ -1935,6 +1935,12 @@
+ x86_64-*-elf*)
+ 	tm_file="${tm_file} i386/unix.h i386/att.h elfos.h newlib-stdint.h i386/i386elf.h i386/x86-64.h"
+ 	;;
+x86_64-*-montauk*)
+	tm_file="${tm_file} i386/unix.h i386/att.h elfos.h newlib-stdint.h i386/i386elf.h i386/x86-64.h montauk.h"
+	# The Montauk libc has no stdint.h of its own (programs normally use
+	# the freestanding kernel headers), so GCC must provide one.
+	use_gcc_stdint=provide
+	;;
+ x86_64-*-rtems*)
+ 	tm_file="${tm_file} i386/unix.h i386/att.h elfos.h newlib-stdint.h i386/i386elf.h i386/x86-64.h i386/rtemself.h rtems.h"
+ 	;;
+--- a/libgcc/config.host
+++ b/libgcc/config.host
+@@ -741,6 +741,10 @@
+ i[34567]86-*-elf*)
+ 	tmake_file="$tmake_file i386/t-crtstuff t-crtstuff-pic t-libgcc-pic"
+ 	;;
+x86_64-*-montauk*)
+	tmake_file="$tmake_file i386/t-crtstuff t-crtstuff-pic t-libgcc-pic"
+	extra_parts="crtbegin.o crtend.o"
+	;;
+ x86_64-*-elf* | x86_64-*-rtems*)
+ 	tmake_file="$tmake_file i386/t-crtstuff t-crtstuff-pic t-libgcc-pic"
+ 	case ${host} in
+--- a/fixincludes/mkfixinc.sh
+++ b/fixincludes/mkfixinc.sh
+@@ -20,6 +20,7 @@
+     powerpcle-*-eabisim* | \
+     powerpcle-*-eabi* | \
+     *-*-vxworks7* | \
+    *-montauk* | \
+     *-musl* )
+ 	#  IF there is no include fixing,
+ 	#  THEN create a no-op fixer and exit