From e5b52949b2c96f4e6ab619bcb7fbcbecad55ae61 Mon Sep 17 00:00:00 2001
From: Martin Errenst <imp@hannover.ccc.de>
Date: Sun, 27 Aug 2017 14:12:34 +0200
Subject: [PATCH] add some notes in the readme

---
 readme | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 readme

diff --git a/readme b/readme
new file mode 100644
index 0000000..cdf17b7
--- /dev/null
+++ b/readme
@@ -0,0 +1,6 @@
+Another option would be -g -grecord-gcc-switches and search for DW_AT_producer.
+Sadly, this doesn't produce the wanted information with clang:
+	clang++: DW_AT_producer    : (indirect string, offset: 0x0): clang version 3.9.1 (tags/RELEASE_391/final)
+	g++: DW_AT_producer    : (indirect string, offset: 0x37): GNU C++ 4.9.4 -mtune=generic -march=x86-64 -g -O3 -frecord-gcc-switches -fstack-protector-strong
+
+Passing the CPPFLAGS and so on as -DMY_FLAGS=.... to the compiler call will not include some information set by the compiler itself (compare the parameters set in the Makefile with the printed output).