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AC_PROG_CXX has to occur before LT_INIT to prevent this error:
warning: AC_REQUIRE: `AC_PROG_CXX' was expanded before it was required
https://www.gnu.org/software/autoconf/manual/autoconf.html#Expanded-Before-Required
It seems to be impossible (or too difficult) to enable this check
conditionally, based on whether ocamltest was enabled or not.
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All of the headers in caml directories (i.e. the headers which get installed) are tested in a both a C and, if a compiler is available, C++ file which #include's just that file. The compiler is run with extra/pedantic warnings, but with CAML_INTERNALS not defined. This tests: 1. That each header can be #include'd without prerequisites 2. That the public API of the runtime can be used both in C++ programs and also in C programs compiled with more warnings enabled than the runtime itself is compiled with 3. That each header can be #include'd twice without error
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