解决msys2提示替换 mingw-w64-i686-ncurses 为 mingw32/mingw-w64-i686-pdcurses 吗 ？后失败的问题
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| ➜ ~ pacman -Syyu
:: Synchronizing package databases...
mingw32 545.2 KiB 822K/s 00:01 [------------------------------------------------------------------------] 100%
mingw32.sig 119.0 B 5.81K/s 00:00 [------------------------------------------------------------------------] 100%
mingw64 546.4 KiB 3.38M/s 00:00 [------------------------------------------------------------------------] 100%
mingw64.sig 119.0 B 9.68K/s 00:00 [------------------------------------------------------------------------] 100%
msys 180.4 KiB 5.68M/s 00:00 [------------------------------------------------------------------------] 100%
msys.sig 119.0 B 11.6K/s 00:00 [------------------------------------------------------------------------] 100%
:: Starting core system upgrade...
there is nothing to do
:: Starting full system upgrade...
warning: mingw-w64-i686-binutils: local (2.31.1-1) is newer than mingw32 (2.30-6)
:: Replace mingw-w64-i686-ncurses with mingw32/mingw-w64-i686-pdcurses? [Y/n] y
:: Replace mingw-w64-i686-termcap with mingw32/mingw-w64-i686-pdcurses? [Y/n] y
warning: mingw-w64-x86_64-binutils: local (2.31.1-1) is newer than mingw64 (2.30-6)
:: Replace mingw-w64-x86_64-ncurses with mingw64/mingw-w64-x86_64-pdcurses? [Y/n] y
:: Replace mingw-w64-x86_64-termcap with mingw64/mingw-w64-x86_64-pdcurses? [Y/n] y
resolving dependencies...
looking for conflicting packages...
error: failed to prepare transaction (could not satisfy dependencies)
:: installing mingw-w64-i686-gcc (9.1.0-2) breaks dependency 'mingw-w64-i686-gcc=7.4.0-1' required by mingw-w64-i686-gcc-ada
:: installing mingw-w64-i686-gcc (9.1.0-2) breaks dependency 'mingw-w64-i686-gcc=7.4.0-1' required by mingw-w64-i686-gcc-objc
:: installing mingw-w64-x86_64-gcc (9.1.0-2) breaks dependency 'mingw-w64-x86_64-gcc=8.3.0-2' required by mingw-w64-x86_64-gcc-ada
:: installing mingw-w64-x86_64-gcc (9.1.0-2) breaks dependency 'mingw-w64-x86_64-gcc=8.3.0-2' required by mingw-w64-x86_64-gcc-objc
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查找资料，发现已将*-ncurses与*-termcap替换为*-pdcurses,但这不是导致错误的原因.导致错误的原因是ada与objc已经被弃用，需要手动移除ada与objc.
pacman -R --noconfirm mingw-w64-i686-gcc-ada mingw-w64-i686-gcc-objc mingw-w64-x86_64-gcc-ada mingw-w64-x86_64-gcc-objc,然后pacman -Syyu问题解决