From 4bc1ac3fe2fe3ae96ba0e5aa4d19fa4885a16c83 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sun, 20 Jun 2021 19:02:46 +0200
Subject: Add convenience macro for registering build config call-backs.

---
 cppbuild.cc   | 8 ++++++--
 libcppbuild.h | 6 ++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/cppbuild.cc b/cppbuild.cc
index 50c364f..d3d21be 100644
--- a/cppbuild.cc
+++ b/cppbuild.cc
@@ -147,6 +147,10 @@ BuildConfigurations myConfigs2()
 	};
 }
 
-int a = reg(__FILE__, myConfigs);
-int b = reg(__FILE__, myConfigs2);
+//int a = reg(__FILE__, myConfigs);
+//int b = reg(__FILE__, myConfigs2);
 }
+
+// Convenience macro
+REG(myConfigs);
+REG(myConfigs2);
diff --git a/libcppbuild.h b/libcppbuild.h
index 5b442f8..2aba987 100644
--- a/libcppbuild.h
+++ b/libcppbuild.h
@@ -27,3 +27,9 @@ struct BuildConfiguration
 using BuildConfigurations = std::vector<BuildConfiguration>;
 
 int reg(const char* location, BuildConfigurations (*cb)());
+
+// Convenience macro - ugly but keeps things simple(r)
+#define CONCAT(a, b) CONCAT_INNER(a, b)
+#define CONCAT_INNER(a, b) a ## b
+#define UNIQUE_NAME(base) CONCAT(base, __LINE__)
+#define REG(cb) namespace { int UNIQUE_NAME(unique) = reg(__FILE__, cb); }
-- 
cgit v1.2.3