I have the following lines in my ~/.emacs.d/init.el

(custom-set-variables
  '(flymake-allowed-file-name-masks 
    (quote 
      (
        ("\\.cc\\'" flymake-simple-make-init) 
        ("\\.cpp\\'" flymake-simple-make-init)))))
(add-hook 'find-file-hook 'flymake-find-file-hook)

When I open a C++ file that has a proper Makefile in the same folder, I get on-the-fly compilation and error reporting (Flymake will check the syntax and report errors and warnings during code editing).

The Makefile has a check-syntax target:

.PHONY: check-syntax
check-syntax:
 $(CXX) -Wall -Wextra -pedantic -fsyntax-only $(CHK_SOURCES)

The problem is that when I open a .cc file that has no corresponding Makefile I get an annoying dialog box that warns me about flymake being disabled.

So if I launch emacs *.cc in a folder with 20 C++ files I get 20 modal dialog boxes saying something like No buildfile found for [...]. Flymake will be switched off.

Is there some hook I can use to disable that warning? Can you provide sample elisp code and explanation on how you found the proper hook?

c++ emacs elisp flymake
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