haskell - 'yesod devel' 期间构建失败

Question

我正在关注 Yesod quick start guide我在执行 cabal install 时遇到错误和 yesod devel关于persistent-sqlite模块。我已经安装了 ghc-7.4.1 和 haskell-platform-2012.2.0.0。

$阴谋安装:

Loading package persistent-sqlite-0.9.0.2 ... linking ... ghc: /home/roberto/.cabal/lib/persistent-sqlite-0.9.0.2/ghc-7.4.1/HSpersistent-sqlite-0.9.0.2.o: unknown symbol `__warn_memset_zero_len'

ghc: unable to load package `persistent-sqlite-0.9.0.2'

cabal: Error: some packages failed to install: mate-0.0.0 failed during the building phase. The exception was: ExitFailure 1

$ yesod 开发:

ghc: /home/roberto/.cabal/lib/persistent-sqlite-0.9.0.2/ghc-7.4.1/HSpersistent-sqlite-0.9.0.2.o: unknown symbol `__warn_memset_zero_len'

ghc: unable to load package `persistent-sqlite-0.9.0.2' Build failure, pausing...

$ ghc-pkg 列表:

persistent-sqlite-0.9.0.2
yesod-platform-1.0.5

$ cabal install persistent-sqlite --reinstall

In function ‘memset’,

inlined from ‘exprDup’ at cbits/sqlite3.c:68471:0: 

/usr/include/bits/string3.h:82:0: warning: call to ‘__warn_memset_zero_len’ declared with attribute warning: memset used with constant zero length parameter; this could be due to transposed parameters

如果我把那一行注释掉， __warn_memset_zero_len();在 /usr/include/bits/string3.h:82 ，一切顺利。有没有合适的解决方案，比如告诉 ghc 不要停止编译警告？

Answer 1

运行时出现未知符号错误 yesod devel通常是由于未能在 exposed-modules 中包含模块造成的或 other-modules在你的应用程序的 cabal 文件中。