docs(plan): 「libstdc++ 一个宏就行」是错的 - #477
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同一批 40 个 freestanding 头、同一份 libstdc++ 16.1.0、同样 -D_GLIBCXX_HOSTED=0,
只换目标:
x86_64-linux-gnu(宿主) 40 / 40 编过
riscv64-none-elf(裸机) 0 / 40,全部倒在同一处
bits/c++config.h:733: bits/os_defines.h:39: 'features.h' file not found
⇒ 原来那个 29/34 是在**宿主目标**上量的。它证明的是「libstdc++ 支持 freestanding
模式」,而不是「libstdc++ 能服务一个裸机目标」—— 而后者才是这个包的用途。
⭐ 问题的提法因此要改:重点不是**用哪个标准库**,而是**那份标准库有没有为这个目标
configure 过**。libc++ 的逐目标配置是一个扁平宏列表(可以 sed 合成,本仓库已经这么
做);libstdc++ 的是 configure 的产物,且把宿主 C 库拖进来。
⚠️ MSVC STL 一栏标为**未测量** —— 本机没有 MSVC 载荷,不能声称验证过。
这条理由比原先的「配置层很小」更准确也更有用:它说明**换实现解决不了 Windows 的
问题**。
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只动文档。
同一批头、同一份 libstdc++、同样
-D_GLIBCXX_HOSTED=0,只换目标:宿主 40/40,裸机 0/40,全部倒在features.h。⇒ 原来那个 29/34 是在宿主目标上量的 —— 它证明「libstdc++ 支持 freestanding 模式」,而不是「libstdc++ 能服务裸机目标」。
⭐ 提法要改:重点不是用哪个标准库,而是那份标准库有没有为这个目标 configure 过。⚠️ MSVC STL 一栏标为未测量。