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Restore the call to AC_NO_EXECUTABLES -- I naively assumed in commit 2e9aa5f56cc26a411014a7f788423c670cfb5646 ("newlib: update preprocessor configure checks") that checking for a preprocessor would not involve linking code. Unfortunately, autoconf will implicitly check that the compiler "works" before allowing it to be used, and that involves a link test, and that fails because newlib provides the C library which is needed to pass a link test. There is some code in NEWLIB_CONFIGURE specifically to help mitigate these, but it's not kicking in here for some reason, so let's just add the AC_NO_EXECUTABLES call back until we can unwind that custom logic. Additionally, we have to call AC_PROG_CPP explicitly. This was being invoked later on, but only in the use_libtool=yes codepath, and that is almost never enabled.
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