Please see NSPR bug 849089 for more background info. The ac_cv_prog_hostcc_works and ac_cv_prog_hostcxx_works variables are set but never used in configure.in and js/src/configure.in. In fact, there is a syntax error in the way we set the variables. It is missing a semicolon (or a new line). This breaks autoconf 2.50+. With autoconf 2.13, this generates incorrect code -- the variables are set as environment variables for the invocation of an 'echo' command. Since we are not using the variables, this mistake was not discovered. Use these MXR queries http://mxr.mozilla.org/mozilla-central/search?string=ac_cv_prog_hostcc_works http://mxr.mozilla.org/mozilla-central/search?string=ac_cv_prog_hostcxx_works to find the places that need fixing.
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