Cannot parse 'inline' from OCaml headers

[edwintorok]

Using calipso/FrontC 4.0.0 on Fedora34:

cat >x.c <<EOF
#include "caml/mlvalues.h"
#include "caml/memory.h"
#include "caml/alloc.h"

value dummy(value x) {
  CAMLparam1(x);
  CAMLreturn(x);
}
EOF

calipso_stat -p 'gcc -std=c99 -E -I /home/edwin/.opam/4.11.0/lib/ocaml/ %i -o %o' y.c
/home/edwin/.opam/4.11.0/lib/ocaml/caml/misc.h[214] Syntax error: static inline int caml_uadd_overflow(uintnat a, uintnat b, uintnat * res)
goto total = 0
goto average = -
goto maximum = 0
goto functions = 0
label total = 0
label average = -
label maximum = 0
label functions = 0

Note: std=c99 is needed otherwise it fails at a different place:
/usr/lib/gcc/x86_64-redhat-linux/11/include/stddef.h[416] Syntax error: long long __max_align_ll __attribute__((__aligned__(__alignof__(long long))));

(If I save the preprocessed file and delete the inline the next failure will be:
/usr/include/stdio.h[415] Syntax error: extern int sscanf (const char *__restrict __s, const char *__restrict __format, ...) __asm__ ("" "__isoc99_sscanf") __attribute__ ((__nothrow__ , __leaf__)))