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[components][dfs] Refix #2100 PR 

#2100 PR 增加 `#include <libc.h>` 后，如果定义了 `RT_USING_DFS_DEVFS`，那就必须要开启 LIBC 才可以成功编译，增加了对 RT_USING_LIBC 的依赖。但是，这个修复又是关于开启 POSIX 的时候遇到的问题，因此建议在引入 <libc.h> 的地方，加入对 `RT_USING_POSIX` 的依赖。

Signed-off-by: MurphyZhao <d2014zjt@163.com>
This commit is contained in:
MurphyZhao 2019-01-05 12:00:22 +08:00
parent 366e28f476
commit 5d6c7e0df7
1 changed files with 2 additions and 2 deletions
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components/dfs/src/dfs.c
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@ -18,7 +18,7 @@
#include <lwp.h>
#endif
#ifdef RT_USING_DFS_DEVFS
#if defined(RT_USING_DFS_DEVFS) && defined(RT_USING_POSIX)
#include <libc.h>
#endif
@ -216,7 +216,7 @@ struct dfs_fd *fd_get(int fd)
struct dfs_fd *d;
struct dfs_fdtable *fdt;
#ifdef RT_USING_DFS_DEVFS
#if defined(RT_USING_DFS_DEVFS) && defined(RT_USING_POSIX)
if ((0 <= fd) && (fd <= 2))
fd = libc_stdio_get_console();
#endif