Add comments to dmydln.c, dmyenc.c, and dmyext.c
They are used conditionally in miniruby, dynamically-linked ruby, and statically-linked ruby (--with-static-linked-ext). I asked @nobu about the conditions. and I leave comments because the conditions are insanely difficult.
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dmydln.c
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dmydln.c
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// This file is used by miniruby, not ruby.
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// ruby uses dln.c.
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#include "ruby/ruby.h"
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#include "ruby/ruby.h"
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NORETURN(void *dln_load(const char *));
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NORETURN(void *dln_load(const char *));
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dmyenc.c
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dmyenc.c
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// This file is used only by ruby.
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// miniruby does not use this Init_enc. Instead, "miniinit.c" provides Init_enc, which defines only the builtin encodings.
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// Dynamically-linked ruby uses this Init_enc, which requires "enc/encdb.so" to load the builtin encodings and set up the optional encodings.
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// Statically-linked ruby does not use this Init_enc. Instead, "enc/encinit.c" (which is a generated file) defines Init_enc, which activates the encodings.
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#define require(name) ruby_require_internal(name, (unsigned int)sizeof(name)-1)
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#define require(name) ruby_require_internal(name, (unsigned int)sizeof(name)-1)
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int ruby_require_internal(const char *, int);
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int ruby_require_internal(const char *, int);
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dmyext.c
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dmyext.c
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// This file is used by dynamically-linked ruby and miniruby.
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// miniruby uses this Init_ext, which does nothing. It does not support require'ing extension libraries.
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// Dynamically-linked ruby uses this Init_ext, which does nothing. It loads extension libraries by dlopen, etc.
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// Statically-linked ruby does not use this Init_ext. Instead, "ext/extinit.c" (which is a generated file) defines Init_ext, which activates the (statically-linked) extension libraries.
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void
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void
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Init_ext(void)
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Init_ext(void)
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{
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{
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