why does C++ module header unit need to precompiled with build system instead of build automatically with compiler？

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To: "gcc-help@xxxxxxxxxxx" <gcc-help@xxxxxxxxxxx>
Subject: why does C++ module header unit need to precompiled with build system instead of build automatically with compiler？
From: sotrdg sotrdg via Gcc-help <gcc-help@xxxxxxxxxxx>
Date: Wed, 23 Aug 2023 22:04:31 +0000
Accept-language: en-US, zh-CN
Reply-to: sotrdg sotrdg <euloanty@xxxxxxxx>

I just wonder why do i need to precompile header unit as C++ modules？why not do it automatically with gcc？i am not talking about import module；i am talking about import "header.h";

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