zig cc can't read input from stdin

[Sahnvour]

Meson uses CXX -E -dM - to read all defines produced by a compiler.

This fails with zig cc and zig c++ because the - flag is not recognized:

$ zig cc -target x86_64-windows-gnu -E -dM -
Unknown Clang option: '-'

How can we handle it?

[Rocknest]

Maybe add this condition mem.eql(u8, arg, "-") or before the existing condition in

zig/src-self-hosted/stage2.zig

Line 1174 in 42b1b6b

if (!mem.startsWith(u8, arg, "-")) {

Then this special filename should be forwarded to clang, i think

EDIT: it was moved to

zig/src/main.zig

Line 2813 in 939b486

if (!mem.startsWith(u8, arg, "-")) {

[Jan200101]

without this zig cc cannot be used as a drop-in C compiler replacement on projects using meson

meson.build:1:0: ERROR: Unable to get clang pre-processor defines:
error: Unknown Clang option: '-'

[Ristovski]

Maybe add this condition mem.eql(u8, arg, "-") or before the existing condition in

zig/src-self-hosted/stage2.zig

Line 1174 in 42b1b6b

if (!mem.startsWith(u8, arg, "-")) {

Then this special filename should be forwarded to clang, i think
EDIT: it was moved to

zig/src/main.zig

Line 2813 in 939b486

if (!mem.startsWith(u8, arg, "-")) {

Can confirm this makes zig cc work with meson.