From aafc16f44969a33e2180c0ca052cb527825430fb Mon Sep 17 00:00:00 2001
From: Luca Saiu <positron@pep.foundation>
Date: Thu, 11 Nov 2021 10:27:13 +0100
Subject: [PATCH] define platform-identification CPP macros

---
 Makefile.conf | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Makefile.conf b/Makefile.conf
index 414ad310..16bbd5f7 100644
--- a/Makefile.conf
+++ b/Makefile.conf
@@ -87,6 +87,7 @@ endif
 # Are we wiping this on purpose?
 LDLIBS=
 
+# Define compiler.
 ifeq ($(BUILD_FOR),OS/390)
     CC=xlclang
 else ifeq ($(BUILD_FOR),Linux)
@@ -95,6 +96,16 @@ else ifeq ($(BUILD_FOR),Darwin)
     CC=clang 
 endif
 
+# Define platform-identification feature macros.
+ifeq ($(BUILD_FOR),Linux)
+    CPPFLAGS+= -DUNIX 
+else ifeq ($(BUILD_FOR),Darwin)
+    CPPFLAGS+= -DUNIX -DDARWIN 
+else ifeq ($(BUILD_FOR),OS/390)
+    CPPFLAGS+= -DZOS 
+endif
+
+# Add platform-specific compilation options.
 ifeq ($(BUILD_FOR),OS/390)
     CFLAGS= -Wno-gnu-include-next -qnosearch -I$(HERE) -I.
     CFLAGS+= -I/usr/include