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macOS: Change Mach-O object file layout required by XCode 15.0.

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Reported by George Zhao. #1404
This commit is contained in:
Mike Pall
2025-11-08 16:54:00 +01:00
parent 578c41ceb7
commit fdf2379ccb
1 changed files with 18 additions and 12 deletions
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30
src/jit/bcsave.lua
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@@ -465,9 +465,11 @@ typedef struct {
mach_segment_command_64 seg;
mach_section_64 sec;
mach_symtab_command sym;
} mach_obj_64;
typedef struct {
mach_nlist_64 sym_entry;
uint8_t space[4096];
} mach_obj_64;
} mach_obj_64_tail;
]]
local symname = '_'..LJBC_PREFIX..ctx.modname
local cputype, cpusubtype = 0x01000007, 3
@@ -479,7 +481,10 @@ typedef struct {
-- Create Mach-O object and fill in header.
local o = ffi.new("mach_obj_64")
local mach_size = aligned(ffi.offsetof(o, "space")+#symname+2, 8)
local t = ffi.new("mach_obj_64_tail")
local ofs_bc = ffi.sizeof(o)
local sz_bc = aligned(#s, 8)
local ofs_sym = ofs_bc + sz_bc
-- Fill in sections and symbols.
o.hdr.magic = 0xfeedfacf
@@ -491,7 +496,7 @@ typedef struct {
o.seg.cmd = 0x19
o.seg.cmdsize = ffi.sizeof(o.seg)+ffi.sizeof(o.sec)
o.seg.vmsize = #s
o.seg.fileoff = mach_size
o.seg.fileoff = ofs_bc
o.seg.filesize = #s
o.seg.maxprot = 1
o.seg.initprot = 1
@@ -499,22 +504,23 @@ typedef struct {
ffi.copy(o.sec.sectname, "__data")
ffi.copy(o.sec.segname, "__DATA")
o.sec.size = #s
o.sec.offset = mach_size
o.sec.offset = ofs_bc
o.sym.cmd = 2
o.sym.cmdsize = ffi.sizeof(o.sym)
o.sym.symoff = ffi.offsetof(o, "sym_entry")
o.sym.symoff = ofs_sym
o.sym.nsyms = 1
o.sym.stroff = ffi.offsetof(o, "sym_entry")+ffi.sizeof(o.sym_entry)
o.sym.stroff = ofs_sym + ffi.offsetof(t, "space")
o.sym.strsize = aligned(#symname+2, 8)
o.sym_entry.type = 0xf
o.sym_entry.sect = 1
o.sym_entry.strx = 1
ffi.copy(o.space+1, symname)
t.sym_entry.type = 0xf
t.sym_entry.sect = 1
t.sym_entry.strx = 1
ffi.copy(t.space+1, symname)
-- Write Mach-O object file.
local fp = savefile(output, "wb")
fp:write(ffi.string(o, mach_size))
bcsave_tail(fp, output, s)
fp:write(ffi.string(o, ofs_bc))
fp:write(s, ("\0"):rep(sz_bc - #s))
bcsave_tail(fp, output, ffi.string(t, ffi.offsetof(t, "space") + o.sym.strsize))
end
local function bcsave_obj(ctx, output, s)