improvements to iwyudummy target

- split awk script into separate file
- make awk work on older awk version
- create new target in main Makefile.in to generate
iwyudummy Makefile so we don't have to manually uncomment
stuff
- exclude /usr includes from the generated makefile
- disable unused macros warnings to reduce noise
- add some sanity checking - prevent using the generated
makefile with compiler-plugins enabled
- add new target for generating iwyu Makefile so we don't
need to edit the Makefile when using it

Change-Id: I4af8eb7d1aa5419e546acb9ef905a0fe623db57d
Reviewed-on: https://gerrit.libreoffice.org/12980
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/bin/gen-iwyu-dummy-lib.awk b/bin/gen-iwyu-dummy-lib.awk
new file mode 100644
index 000000000000..464d9515c7ef
--- /dev/null
+++ b/bin/gen-iwyu-dummy-lib.awk
@@ -0,0 +1,34 @@
+BEGIN  { domatch = 0; }
+
+{
+    if ($0 ~ /use_external(s)?,/ )
+    {
+        if (index($0, "))"))
+        {
+            gsub(/.*,/, "");
+            gsub(/\)+/, ""); 
+            if (!($0 in exts))
+            {
+                exts[$0];
+                print $0;
+            }
+        }
+        else
+        {
+           domatch = 1;
+        }
+    }
+    else if ($0 ~ /\)\)/ )
+    {
+        domatch = 0;
+    }
+    else if (domatch == 1)
+    {
+        if (!($1 in exts))
+        {
+            exts[$1];
+            print $1;
+        }
+    }
+}
+