1 files changed, 36 insertions, 0 deletions
diff --git a/doc/3_Building/index.rst b/doc/3_Building/index.rst
index 98468fd7f..d240ff94d 100644
--- a/doc/3_Building/index.rst
+++ b/doc/3_Building/index.rst
@@ -3,4 +3,40 @@
 Building GHDL
 #############
 
+.. TODO: topic
 
+  `./BUILD.txt <https://github.com/tgingold/ghdl/blob/master/BUILD.txt>`_
+  Directory structure of the main branch [1138: #279]
+  Coverage, `gcov`, is unique to gcc. That specific difference is not explained anywhere. Should be added.
+  @1138 Backtraces optional -patchable-
+
+GCC backend
+=================
+
+- ./dist/gcc/INSTALL
+- ./gcc/README
+- Linux
+
+LLVM backend 
+=================
+
+- Linux
+- Mac OS?
+- Windows MinGW 32/64
+	  
+Mcode backend
+=================
+
+- ./dist/mcode/README
+- Linux
+- Windows GNAT GPL (32 only)
+- Windows MinGW 32/64
+
+Test suites
+=================
+
+----------------
+
+.. TODO: topic
+
+  @1138 explain that there are two (maybe three with vhdl08 tests)
+\ No newline at end of file