[PATCH v3 5/5] tools/ocaml: Fix redefinition errors

From: Costin Lupu <costin.lupu@cs.pub.ro>
To: xen-devel@lists.xenproject.org
Cc: Christian Lindig <christian.lindig@citrix.com>,
	David Scott <dave@recoil.org>, Ian Jackson <iwj@xenproject.org>,
	Wei Liu <wl@xen.org>
Subject: [PATCH v3 5/5] tools/ocaml: Fix redefinition errors
Date: Mon, 10 May 2021 11:35:19 +0300	[thread overview]
Message-ID: <50763a92df0c58ed0d7749717b7ff5e2a039a4dd.1620633386.git.costin.lupu@cs.pub.ro> (raw)
In-Reply-To: <cover.1620633386.git.costin.lupu@cs.pub.ro>

If PAGE_SIZE is already defined in the system (e.g. in /usr/include/limits.h
header) then gcc will trigger a redefinition error because of -Werror. This
patch replaces usage of PAGE_* macros with XC_PAGE_* macros in order to avoid
confusion between control domain page granularity (PAGE_* definitions) and
guest domain page granularity (which is what we are dealing with here).

Same issue applies for redefinitions of Val_none and Some_val macros which
can be already define in the OCaml system headers (e.g.
/usr/lib/ocaml/caml/mlvalues.h).

Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>
---
 tools/ocaml/libs/xc/xenctrl_stubs.c            | 10 ++++------
 tools/ocaml/libs/xentoollog/xentoollog_stubs.c |  4 ++++
 tools/ocaml/libs/xl/xenlight_stubs.c           |  4 ++++
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/tools/ocaml/libs/xc/xenctrl_stubs.c b/tools/ocaml/libs/xc/xenctrl_stubs.c
index d05d7bb30e..f9e33e599a 100644
--- a/tools/ocaml/libs/xc/xenctrl_stubs.c
+++ b/tools/ocaml/libs/xc/xenctrl_stubs.c
@@ -36,14 +36,12 @@
 
 #include "mmap_stubs.h"
 
-#define PAGE_SHIFT		12
-#define PAGE_SIZE               (1UL << PAGE_SHIFT)
-#define PAGE_MASK               (~(PAGE_SIZE-1))
-
 #define _H(__h) ((xc_interface *)(__h))
 #define _D(__d) ((uint32_t)Int_val(__d))
 
+#ifndef Val_none
 #define Val_none (Val_int(0))
+#endif
 
 #define string_of_option_array(array, index) \
 	((Field(array, index) == Val_none) ? NULL : String_val(Field(Field(array, index), 0)))
@@ -818,7 +816,7 @@ CAMLprim value stub_xc_domain_memory_increase_reservation(value xch,
 	CAMLparam3(xch, domid, mem_kb);
 	int retval;
 
-	unsigned long nr_extents = ((unsigned long)(Int64_val(mem_kb))) >> (PAGE_SHIFT - 10);
+	unsigned long nr_extents = ((unsigned long)(Int64_val(mem_kb))) >> (XC_PAGE_SHIFT - 10);
 
 	uint32_t c_domid = _D(domid);
 	caml_enter_blocking_section();
@@ -924,7 +922,7 @@ CAMLprim value stub_pages_to_kib(value pages)
 {
 	CAMLparam1(pages);
 
-	CAMLreturn(caml_copy_int64(Int64_val(pages) << (PAGE_SHIFT - 10)));
+	CAMLreturn(caml_copy_int64(Int64_val(pages) << (XC_PAGE_SHIFT - 10)));
 }
 
 
diff --git a/tools/ocaml/libs/xentoollog/xentoollog_stubs.c b/tools/ocaml/libs/xentoollog/xentoollog_stubs.c
index bf64b211c2..e4306a0c2f 100644
--- a/tools/ocaml/libs/xentoollog/xentoollog_stubs.c
+++ b/tools/ocaml/libs/xentoollog/xentoollog_stubs.c
@@ -53,8 +53,12 @@ static char * dup_String_val(value s)
 #include "_xtl_levels.inc"
 
 /* Option type support as per http://www.linux-nantes.org/~fmonnier/ocaml/ocaml-wrapping-c.php */
+#ifndef Val_none
 #define Val_none Val_int(0)
+#endif
+#ifndef Some_val
 #define Some_val(v) Field(v,0)
+#endif
 
 static value Val_some(value v)
 {
diff --git a/tools/ocaml/libs/xl/xenlight_stubs.c b/tools/ocaml/libs/xl/xenlight_stubs.c
index 352a00134d..45b8af61c7 100644
--- a/tools/ocaml/libs/xl/xenlight_stubs.c
+++ b/tools/ocaml/libs/xl/xenlight_stubs.c
@@ -227,8 +227,12 @@ static value Val_string_list(libxl_string_list *c_val)
 }
 
 /* Option type support as per http://www.linux-nantes.org/~fmonnier/ocaml/ocaml-wrapping-c.php */
+#ifndef Val_none
 #define Val_none Val_int(0)
+#endif
+#ifndef Some_val
 #define Some_val(v) Field(v,0)
+#endif
 
 static value Val_some(value v)
 {
-- 
2.20.1


