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--target: windows, linux, arm64, macos or a triple, in the compiler written in Finch

Browse source 
Targets, the target's C compiler (FINCH_CC) for linking, C import for the target (--target to libclang, its
headers), the AAPCS64 and Microsoft x64 ways of passing structs by value (and the System V one),
dllexport for libraries on Windows, .exe names, and running the program through wine or qemu-aarch64.
std/ gets time_windows.fch and proc_windows.fch: a module has a version per system (name_windows.fch,
name_macos.fch, name_linux.fch) that wins over name.fch. stdin, stdout and stderr work where C makes them macros.

Run for real: all 27 programs under tests/run and tests/new pass on ARM64 Linux under qemu and on Windows
under Wine (MinGW), structs by value and callbacks included. macOS is only checked as far as clang accepts the
IR; there is no emulator for it here.
This commit is contained in:
Nexoniarz 2026-10-25 21:33:19 +01:00
commit 750eca3e85
10 changed files with 426 additions and 52 deletions
Download patch file Download diff file Expand all files Collapse all files

15
boot/cimport.fch
View file

@ -99,10 +99,10 @@ fn fixed(ast.Type elem, int count) -> ast.Type {
// ---------- the system's header folders ----------
// Ask the system C compiler where it looks for headers, so we find the same stdio.h it would.
fn systemIncludeArgs() -> []str {
fn systemIncludeArgs(str cc) -> []str {
[]str dirs
tmp := "/tmp/finch_cc_dirs.txt"
shell("cc -E -v -x c /dev/null 2> '" + tmp + "' > /dev/null")
shell(cc + " -E -v -x c /dev/null 2> '" + tmp + "' > /dev/null")
if !file_exists(tmp) {
return dirs
}
@ -504,16 +504,23 @@ fn visit(ptr[Importer] imp, CXCursor c) {
}
// Read every header in `headers`; `dirs` are searched first for "local.h" headers.
fn importHeaders([]Header headers, []str dirs) -> CImports! {
// `target` is the LLVM triple the program is built for ("" = this system): sizes and headers depend on it.
fn importHeaders([]Header headers, []str dirs, str target, bool windows, str ccFor) -> CImports! {
imp := Importer()
if headers.len == 0 {
return imp.out
}
[]str args = ["-x", "c", "-std=gnu11"]
if target.len > 0 {
args.push("--target=" + target)
}
if windows {
args.push("-D_USE_MATH_DEFINES") // M_PI and friends, as on Linux
}
for d in dirs {
args.push("-I" + d)
}
for d in systemIncludeArgs() {
for d in systemIncludeArgs(ccFor) {
args.push(d)
}
[]ptr[char] argv

136
boot/gen.fch
View file

@ -5,6 +5,7 @@
// (so programs behave the same) but never frees them: it is the bootstrap compiler.
import ast
import cimport
import platform
struct Var {
str name
@ -21,6 +22,7 @@ struct Options {
bool shared // finch build --shared
bool debug // -g
str cwd // the folder the compiler was started in (for the debug info)
platform.Target target
}
// A generic struct or function, kept as written until something asks for a version of it.
@ -146,6 +148,7 @@ struct Gen {
cimport.CImports ci
bool shared // building a library (finch build --shared): no main, its export fns are the way in
bool debug // -g: debug info (DWARF, as LLVM metadata)
platform.Target tg // the system the program is for
str cwd
[]str md // the metadata, numbered by position: !0 = md[0]
map[str]int mdcache // metadata made already: types by key, locations by line:column
@ -3164,6 +3167,16 @@ fn ref(ptr[Gen] g, ast.Node e, bool write) -> Ref {
}
return Ref(isPlace: false, val: Val(v: str(c.i), ty: T("int"), lit: true))
}
// C's standard streams are macros on some systems; the runtime knows them everywhere
if id < 0 && !g.ci.globals.has(e.name) && g.ci.fns.has("fprintf") && (e.name == "stdin" || e.name == "stdout" || e.name == "stderr") {
which := "2"
if e.name == "stdin" {
which = "0"
} else if e.name == "stdout" {
which = "1"
}
return Ref(isPlace: false, val: Val(v: op(g, "call ptr @finch_std_stream(i32 " + which + ")"), ty: T("ptr")))
}
if id < 0 && g.ci.globals.has(e.name) {
gt := resolve(g, g.ci.globals[e.name], e)
if !g.cdone.contains("g:" + e.name) {
@ -3589,6 +3602,49 @@ fn leavesOf(ptr[Gen] g, ast.Type t, int base) -> []Leaf {
return out
}
// AAPCS64 (ARM64 Linux, Apple): a group of one to four floats or doubles travels in vector registers;
// anything else up to 16 bytes in general registers; bigger is copied by the caller and passed by address
fn classifyArm64(ptr[Gen] g, ast.Type t, Abi first, int size, int align) -> Abi {
a := first
ls := leavesOf(g, t, 0)
hfa := ls.len > 0 && ls.len <= 4
for l in ls {
if !l.isFloat || l.isDouble != ls[0].isDouble {
hfa = false
}
}
if hfa {
ft := "float"
if ls[0].isDouble {
ft = "double"
}
a.kind = "expand"
a.parts.push("[" + str(ls.len) + " x " + ft + "]")
[]str elems
for l in ls {
elems.push(ft)
}
a.coerced = "{ " + elems.join(", ") + " }"
return a
}
if size > 16 {
a.kind = "indirect"
return a
}
a.kind = "expand"
if align >= 16 {
a.parts.push("i128")
a.coerced = "i128"
} else if size <= 8 {
a.parts.push("i64")
a.coerced = "i" + str(size * 8)
} else {
a.parts.push("[2 x i64]")
a.coerced = "[2 x i64]"
}
return a
}
fn classify(ptr[Gen] g, ast.Type t) -> Abi {
a := Abi(kind: "direct")
if t.kind != "struct" {
@ -3600,6 +3656,21 @@ fn classify(ptr[Gen] g, ast.Type t) -> Abi {
if sd.calign > 8 {
a.align = sd.calign
}
if g.tg.arm64 {
return classifyArm64(g, t, a, size, sd.calign)
}
if g.tg.windows {
// Microsoft x64: 1, 2, 4 or 8 bytes travel as one integer (even if they hold floats);
// anything else is copied by the caller and passed by address
if size == 1 || size == 2 || size == 4 || size == 8 {
a.kind = "expand"
a.parts.push("i" + str(size * 8))
a.coerced = a.parts[0]
} else {
a.kind = "indirect"
}
return a
}
if size > 16 || size == 0 {
a.kind = "memory"
return a
@ -3663,6 +3734,9 @@ fn makePlan(ptr[Gen] g, ast.Type ret, []ast.Type params) -> Plan {
if ret.kind != "void" {
pl.retLL = cLL(g, ret)
}
if pl.ret.kind == "indirect" {
pl.ret.kind = "memory" // returned through a hidden pointer
}
if pl.ret.kind == "memory" {
pl.sret = true
pl.retLL = "void"
@ -3682,7 +3756,8 @@ fn makePlan(ptr[Gen] g, ast.Type ret, []ast.Type params) -> Plan {
ns += 1
}
}
if ni <= intRegs && ns <= sseRegs {
// only System V counts registers here; elsewhere the backend places each part
if g.tg.windows || g.tg.arm64 || (ni <= intRegs && ns <= sseRegs) {
intRegs -= ni
sseRegs -= ns
} else {
@ -3754,7 +3829,7 @@ fn exportWrapper(ptr[Gen] g, FnSig sig) -> str {
params.push("i8 zeroext %e" + str(k))
args.push("i1 " + op(g, "icmp ne i8 %e" + str(k) + ", 0"))
} else {
params.push(cLL(g, t) + cExt(t) + " %e" + str(k))
params.push(cLL(g, t) + cExt(g, t) + " %e" + str(k))
args.push(llty(g, t) + " %e" + str(k))
}
}
@ -3770,10 +3845,14 @@ fn exportWrapper(ptr[Gen] g, FnSig sig) -> str {
emit(g, "ret i8 " + op(g, "zext i1 " + op(g, text) + " to i8"))
} else {
retLL = llty(g, sig.ret)
retExt = cExt(sig.ret)
retExt = cExt(g, sig.ret)
emit(g, "ret " + retLL + " " + op(g, text))
}
endHelper(g, s, "define" + retExt + " " + retLL + " @" + sig.name + "(" + params.join(", ") + ")")
dll := ""
if g.tg.windows {
dll = " dllexport"
}
endHelper(g, s, "define" + dll + retExt + " " + retLL + " @" + sig.name + "(" + params.join(", ") + ")")
return sig.name
}
@ -3814,8 +3893,12 @@ fn cThunk(ptr[Gen] g, int fi, ast.Node at) -> str {
hdr.push("ptr byval(" + llty(g, t) + ") align " + str(a.align) + " %c" + str(ai))
args.push(llty(g, t) + " " + load(g, llty(g, t), "%c" + str(ai)))
ai += 1
} else if a.kind == "indirect" {
hdr.push("ptr %c" + str(ai))
args.push(llty(g, t) + " " + load(g, llty(g, t), "%c" + str(ai)))
ai += 1
} else if a.kind == "expand" {
slot := alloca(g, "[16 x i8]")
slot := alloca(g, "[32 x i8]")
for k in 0..a.parts.len {
hdr.push(a.parts[k] + " %c" + str(ai))
store(g, a.parts[k], "%c" + str(ai), op(g, "getelementptr inbounds i8, ptr " + slot + ", i64 " + str(8 * k)))
@ -3823,7 +3906,7 @@ fn cThunk(ptr[Gen] g, int fi, ast.Node at) -> str {
}
args.push(llty(g, t) + " " + load(g, llty(g, t), slot))
} else {
hdr.push(cLL(g, t) + cExt(t) + " %c" + str(ai))
hdr.push(cLL(g, t) + cExt(g, t) + " %c" + str(ai))
args.push(llty(g, t) + " %c" + str(ai))
ai += 1
}
@ -3837,11 +3920,11 @@ fn cThunk(ptr[Gen] g, int fi, ast.Node at) -> str {
store(g, llty(g, sig.ret), op(g, text), sretName)
emit(g, "ret void")
} else if pl.ret.kind == "expand" {
slot := alloca(g, "[16 x i8]")
slot := alloca(g, "[32 x i8]")
store(g, llty(g, sig.ret), op(g, text), slot)
emit(g, "ret " + pl.ret.coerced + " " + load(g, pl.ret.coerced, slot))
} else {
retExt = cExt(sig.ret)
retExt = cExt(g, sig.ret)
emit(g, "ret " + cLL(g, sig.ret) + " " + op(g, text))
}
endHelper(g, s, "define internal" + retExt + " " + pl.retLL + " " + name + "(" + hdr.join(", ") + ")")
@ -3880,15 +3963,18 @@ fn enumFrom(ptr[Gen] g, ast.Node c, int ei) -> Val {
// ---------- calling C ----------
// How C extends a number narrower than 32 bits: plain `char` is signed on x86.
fn cExt(ast.Type t) -> str {
fn cExt(ptr[Gen] g, ast.Type t) -> str {
if t.kind == "bool" || isUnsigned(t) {
if bitsOf(t) < 32 {
return " zeroext"
}
}
if (isSigned(t) || t.kind == "char") && bitsOf(t) < 32 {
if (isSigned(t) || (t.kind == "char" && platform.charIsSigned(g.tg))) && bitsOf(t) < 32 {
return " signext"
}
if t.kind == "char" && bitsOf(t) < 32 {
return " zeroext"
}
return ""
}
@ -3939,8 +4025,13 @@ fn callC(ptr[Gen] g, ast.Node c, cimport.CFunc f) -> Val {
spec := "ptr byval(" + llty(g, pt) + ") align " + str(a.align)
ptys.push(spec)
args.push(spec + " " + slot)
} else if a.kind == "indirect" {
slot := alloca(g, llty(g, pt))
store(g, llty(g, pt), v.v, slot)
ptys.push("ptr")
args.push("ptr " + slot)
} else if a.kind == "expand" {
slot := alloca(g, "[16 x i8]")
slot := alloca(g, "[32 x i8]")
store(g, llty(g, pt), v.v, slot)
for k in 0..a.parts.len {
x := load(g, a.parts[k], op(g, "getelementptr inbounds i8, ptr " + slot + ", i64 " + str(8 * k)))
@ -3948,11 +4039,11 @@ fn callC(ptr[Gen] g, ast.Node c, cimport.CFunc f) -> Val {
args.push(a.parts[k] + " " + x)
}
} else {
ptys.push(cLL(g, pt) + cExt(pt))
ptys.push(cLL(g, pt) + cExt(g, pt))
if pt.kind == "str" {
args.push("ptr " + cstr(g, v.v))
} else {
args.push(llty(g, pt) + cExt(pt) + " " + v.v)
args.push(llty(g, pt) + cExt(g, pt) + " " + v.v)
}
}
continue
@ -3986,7 +4077,7 @@ fn callC(ptr[Gen] g, ast.Node c, cimport.CFunc f) -> Val {
retLL := pl.retLL
retExt := ""
if pl.ret.kind == "direct" {
retExt = cExt(ret)
retExt = cExt(g, ret)
}
tail := ""
if f.variadic {
@ -4016,7 +4107,7 @@ fn callC(ptr[Gen] g, ast.Node c, cimport.CFunc f) -> Val {
}
r := op(g, text)
if pl.ret.kind == "expand" {
slot := alloca(g, "[16 x i8]")
slot := alloca(g, "[32 x i8]")
store(g, pl.ret.coerced, r, slot)
return Val(v: load(g, llty(g, ret), slot), ty: ret)
}
@ -4796,6 +4887,7 @@ fn runtimeDecls() -> str {
"declare i32 @fflush(ptr)",
"declare void @finch_str_from_c(ptr, ptr)",
"declare void @finch_on_fatal(ptr)",
"declare ptr @finch_std_stream(i32)",
"declare void @finch_str_from_bytes(ptr, ptr)",
"declare void @exit(i32) noreturn",
"declare void @free(ptr)",
@ -4804,7 +4896,11 @@ fn runtimeDecls() -> str {
}
fn assemble(ptr[Gen] g) -> str {
text := "; generated by the Finch compiler written in Finch\n\n" + g.head.join("\n") + "\n\n" + runtimeDecls() + "\n"
text := "; generated by the Finch compiler written in Finch\n\n"
if g.tg.cross {
text = text + "target triple = \"" + g.tg.triple + "\"\n\n"
}
text = text + g.head.join("\n") + "\n\n" + runtimeDecls() + "\n"
if g.debug {
text = text + "declare void @llvm.dbg.declare(metadata, metadata, metadata)\n\n"
}
@ -4817,7 +4913,7 @@ fn assemble(ptr[Gen] g) -> str {
fn generate([]ast.Program progs, []str files, cimport.CImports ci, Options opt) -> str {
shared := opt.shared
gen := Gen(progs: progs, files: files, ci: ci, shared: opt.shared, debug: opt.debug, cwd: opt.cwd, dbgScope: -1)
gen := Gen(progs: progs, files: files, ci: ci, shared: opt.shared, debug: opt.debug, cwd: opt.cwd, tg: opt.target, dbgScope: -1)
g := addr(gen)
if g.debug {
// !0 the compile unit, !1 and !2 the module flags, then the source files
@ -4852,7 +4948,11 @@ fn generate([]ast.Program progs, []str files, cimport.CImports ci, Options opt)
}
if shared {
// finch_module_on_fatal(handler): the host's say on runtime errors (see runtime/finch_rt.c)
g.out.push("define void @finch_module_on_fatal(ptr %handler) {\nentry:\n call void @finch_on_fatal(ptr %handler)\n ret void\n}\n")
dll := ""
if g.tg.windows {
dll = " dllexport"
}
g.out.push("define" + dll + " void @finch_module_on_fatal(ptr %handler) {\nentry:\n call void @finch_on_fatal(ptr %handler)\n ret void\n}\n")
return assemble(g)
}
// the C entry point calls the Finch main

96
boot/main.fch
View file

@ -10,6 +10,7 @@ import ast
import parser
import gen
import cimport
import platform
import "stdlib.h"
fn dirOf(str path) -> str {
@ -39,6 +40,7 @@ struct Loader {
[]ast.Program progs
[]str files
[]str loaded
str os // "windows", "macos" or "linux": a module may have a version for each (time_windows.fch)
str std // the standard library's folder, or ""
[]str paths // FINCH_PATH: more folders to look for modules in
}
@ -46,18 +48,29 @@ struct Loader {
// import json: the file next to the one that imports it, else the standard library's.
// A program's own json.fch wins over the library's.
fn findModule(ptr[Loader] l, str from, str name) -> str {
// in each folder, the version for this system first: time_windows.fch, then time.fch
local := dirOf(from) + "/" + name + ".fch"
if file_exists(dirOf(from) + "/" + name + "_" + l.os + ".fch") {
return dirOf(from) + "/" + name + "_" + l.os + ".fch"
}
if file_exists(local) {
return local
}
for d in l.paths {
if file_exists(d + "/" + name + "_" + l.os + ".fch") {
return d + "/" + name + "_" + l.os + ".fch"
}
if file_exists(d + "/" + name + ".fch") {
return d + "/" + name + ".fch"
}
}
shared := l.std + "/" + name + ".fch"
if file_exists(shared) {
return shared
if l.std.len > 0 {
if file_exists(l.std + "/" + name + "_" + l.os + ".fch") {
return l.std + "/" + name + "_" + l.os + ".fch"
}
if file_exists(l.std + "/" + name + ".fch") {
return l.std + "/" + name + ".fch"
}
}
return local
}
@ -112,7 +125,9 @@ fn usage() {
print(" -O0 no optimization (faster to build)")
print(" -l <lib> link a library (the same as link \"lib\" in the program)")
print(" -I <dir> look for imported C headers there too")
print("not in this compiler yet: -g, --target, lsp. They are in the C++ one (branch before-bootstrap).")
print(" -g debug info (for gdb and lldb; use -O0 with it)")
print(" --target <name> build for another system: windows, linux, arm64 (Linux), macos, or an LLVM triple")
print("not in this compiler yet: lsp. It is in the C++ one (branch before-bootstrap).")
exit(1)
}
@ -137,6 +152,7 @@ fn main([]str args) -> int {
outGiven := false
shared := false
debug := false
targetName := ""
opt := "-O2"
[]str extraLibs
[]str extraDirs
@ -164,9 +180,9 @@ fn main([]str args) -> int {
ai += 1
} else if a == "-g" {
debug = true
} else if a == "--target" {
print("error: '--target' is not in the compiler written in Finch yet; the C++ one has it (branch before-bootstrap)")
return 1
} else if a == "--target" && ai + 1 < args.len {
targetName = args[ai + 1]
ai += 1
} else if cmd == "run" {
progArgs.push(a)
} else {
@ -174,14 +190,28 @@ fn main([]str args) -> int {
}
ai += 1
}
tg := platform.select(targetName)
if cmd == "run" {
out = "/tmp/finch_run_" + stem(file)
}
if shared && !outGiven {
out = "lib" + out + ".so"
out = "/tmp/finch_run_" + stem(file) + tg.exe
} else if shared && !outGiven {
if tg.windows {
out = out + ".dll"
} else if tg.darwin {
out = "lib" + out + ".dylib"
} else {
out = "lib" + out + ".so"
}
} else if !outGiven {
out = out + tg.exe
}
loader := Loader()
loader.os = "linux"
if tg.windows {
loader.os = "windows"
} else if tg.darwin {
loader.os = "macos"
}
for cand in [dirOf(args[0]) + "/../std", dirOf(args[0]) + "/std", "std"] {
if loader.std.len == 0 && file_exists(cand + "/path.fch") {
loader.std = cand
@ -218,11 +248,15 @@ fn main([]str args) -> int {
}
}
}
ci := cimport.importHeaders(headers, dirs) or {
triple := ""
if tg.cross {
triple = tg.triple
}
ci := cimport.importHeaders(headers, dirs, triple, tg.windows, tg.cc) or {
print(err)
return 1
}
ir := gen.generate(loader.progs, loader.files, ci, gen.Options(shared: shared, debug: debug, cwd: getenv("PWD")))
ir := gen.generate(loader.progs, loader.files, ci, gen.Options(shared: shared, debug: debug, cwd: getenv("PWD"), target: tg))
if cmd == "ir" {
print(ir)
return 0
@ -245,19 +279,37 @@ fn main([]str args) -> int {
}
llPath := out + ".ll"
write_file(llPath, ir)
sharedFlags := ""
// the IR is always compiled by clang (CC may be gcc, which can't read it); FINCH_CC picks the linker for another system
clang := getenv("FINCH_CC")
if clang.len == 0 || tg.cross {
clang = "clang"
}
extra := ""
if shared {
sharedFlags = " -shared -fPIC"
extra = " -fPIC"
}
if debug {
sharedFlags = sharedFlags + " -g" // or clang drops the debug info that is in the IR
extra = extra + " -g" // or clang drops the debug info that is in the IR
}
// the compiler of the IR is always a clang (CC may be gcc, which can't read it); FINCH_CC picks another clang
cc := getenv("FINCH_CC")
if cc.len == 0 {
cc = "clang"
code := 0
if tg.cross {
// an object for the target, then the target's own C compiler links it with the runtime
obj := out + ".o"
code = shell("clang --target=" + tg.triple + " " + opt + extra + " -w -c '" + llPath + "' -o '" + obj + "'")
if code == 0 {
linkShared := ""
if shared {
linkShared = " -shared"
}
code = shell(tg.cc + " '" + obj + "' '" + rt + "' -o '" + out + "' -lm" + linkShared + " " + libs.join(" "))
}
shell("rm -f '" + obj + "'")
} else {
if shared {
extra = extra + " -shared"
}
code = shell(clang + " " + opt + extra + " -w '" + llPath + "' '" + rt + "' -o '" + out + "' -lm " + libs.join(" "))
}
code := shell(cc + " " + opt + sharedFlags + " -w '" + llPath + "' '" + rt + "' -o '" + out + "' -lm " + libs.join(" "))
shell("rm -f '" + llPath + "'")
if code != 0 {
print("error: clang failed")
@ -268,7 +320,7 @@ fn main([]str args) -> int {
for a in progArgs {
quoted.push(quote(a))
}
status := shell(quote(out) + " " + quoted.join(" "))
status := shell(tg.runner + quote(out) + " " + quoted.join(" "))
shell("rm -f " + quote(out))
return status
}

90
boot/platform.fch Normal file
View file

@ -0,0 +1,90 @@
// The system a program is built for, and what depends on it: the C compiler that links, the file
// name of the program, how it is run here, and (through the flags) the C calling convention.
// The same as src/target.cpp.
import "stdlib.h"
struct Target {
str triple // "" = the system the compiler runs on
bool windows // Microsoft x64 calling convention, .exe
bool msvc
bool darwin // macOS
bool arm64 // AAPCS64
bool cross // another system than the one the compiler runs on
str exe // ".exe" or ""
str cc // the C compiler that links (the IR is always compiled by clang)
str runner // how to run a program for it here: "", "wine ", "qemu-aarch64 "
}
fn firstLine(str text) -> str {
parts := text.trim().split("\n")
return parts[0].trim()
}
// what clang calls the system it runs on, like x86_64-pc-linux-gnu
fn hostTriple() -> str {
tmp := "/tmp/finch_triple.txt"
shell("clang -dumpmachine > '" + tmp + "' 2> /dev/null")
out := read_file(tmp) or ""
shell("rm -f '" + tmp + "'")
if out.trim().len == 0 {
return "x86_64-unknown-linux-gnu"
}
return firstLine(out)
}
// "windows", "linux", "macos", "arm64" (ARM64 Linux), or a full LLVM triple; "" = this system
fn select(str name) -> Target {
host := hostTriple()
t := name
if name.len == 0 {
t = host
} else if name == "windows" {
t = "x86_64-w64-mingw32"
} else if name == "linux" {
t = "x86_64-unknown-linux-gnu"
} else if name == "arm64" || name == "aarch64" || name == "linux-arm64" {
t = "aarch64-unknown-linux-gnu"
} else if name == "macos" {
if host.starts_with("aarch64") || host.starts_with("arm64") {
t = "arm64-apple-macosx14.0.0"
} else {
t = "x86_64-apple-macosx14.0.0"
}
}
tg := Target(triple: t)
tg.windows = t.contains("windows") || t.contains("mingw") || t.contains("msvc") || t.contains("win32")
tg.msvc = t.contains("msvc")
tg.darwin = t.contains("apple") || t.contains("darwin") || t.contains("macos")
tg.arm64 = t.starts_with("aarch64") || t.starts_with("arm64")
hostArm := host.starts_with("aarch64") || host.starts_with("arm64")
hostDarwin := host.contains("apple") || host.contains("darwin")
tg.cross = tg.windows || tg.darwin != hostDarwin || tg.arm64 != hostArm
tg.exe = ""
if tg.windows {
tg.exe = ".exe"
}
// FINCH_CC chooses the C compiler for any target
fc := getenv("FINCH_CC")
if fc.len > 0 {
tg.cc = fc
} else if tg.cross && tg.windows {
tg.cc = "x86_64-w64-mingw32-gcc"
} else if tg.cross && tg.arm64 && !tg.darwin {
tg.cc = "aarch64-linux-gnu-gcc"
} else if tg.cross {
tg.cc = "clang --target=" + t
} else {
tg.cc = "cc"
}
if tg.cross && tg.windows {
tg.runner = "wine "
} else if tg.cross && tg.arm64 && !tg.darwin {
tg.runner = "qemu-aarch64 "
}
return tg
}
// C's plain `char`: signed on x86 and Apple, not on ARM64 Linux
fn charIsSigned(Target t) -> bool {
return !t.arm64 || t.darwin || t.windows
}