`zig cc -E -c X` differs from clang/cpp preprocessor modes

[kkartaltepe]

Zig Version

0.13.0

Steps to Reproduce and Observed Behavior

Create a test file:

%{
CUT_OUT_BEGIN
#include <fontconfig/fontconfig.h>
CUT_OUT_END
%}

Run: zig cc -E -P -c test.h

observe:

test.h:1:1: error: expected identifier or '('
    1 | %{
      | ^
1 error generated.

Expected Behavior

It should execute without error, examples that succeed clang -E -P -c test.h, cpp -E -P -c test.h, gcc -E -P -c test.h

It seems related to using the -c flag, since zig cc works when using zig cc -E -P test.h

This is how meson's cc.preprocess command generates calls and is used in the fontconfig project so resolving this would allow compiling fontconfig with zig cc.