Autopkgtest failing on amd64 with "_FORTIFY_SOURCE redefined"

[Danilo Egea Gondolfo]

autopkgtest [13:54:07]: test hello: [-----------------------
833s info: compiling
833s <command-line>: warning: "_FORTIFY_SOURCE" redefined
833s <command-line>: note: this is the location of the previous definition
833s info: running
833s HELLO, WORLD
833s success: Able to run hello world program
834s autopkgtest [13:54:08]: test hello: -----------------------]
834s hello FAIL stderr: <command-line>: warning: "_FORTIFY_SOURCE" redefined
834s autopkgtest [13:54:08]: test hello: - - - - - - - - - - results - - - - - - - - - -
834s autopkgtest [13:54:08]: test hello: - - - - - - - - - - stderr - - - - - - - - - -
834s <command-line>: warning: "_FORTIFY_SOURCE" redefined
834s <command-line>: note: this is the location of the previous definition