我有一个程序,它设置了clang编译器实例并使用HeaderSearchOptions类添加包含路径。当我在输入文件libavutil/samplefmt.c(来自ffmpeg软件包)上运行ParseAst时,在屏幕上会出现以下消息。基本上,它无法解析一些(gcc?)内置函数。如何摆脱这个错误?通常情况下,如果通过HeaderSearchOptions设置包含路径,我该如何确保不会错过来自我的gcc安装的所有包含路径?
谢谢!
谢谢!
#include "..." search starts here:
#include <...> search starts here:
.
/usr/include/freetype2
/usr/include/fribidi
/usr/local/include
/usr/include/clang/Basic
/opt/llvmrelease/bin/../lib/clang/3.4/include
/usr/include/i386-linux-gnu
/include
/usr/include
End of search list.
In file included from libavutil/samplefmt.c:19:
libavutil/common.h:258:12: error: use of unknown builtin '__builtin_clz'
return av_log2((x - 1) << 1);
^
libavutil/intmath.h:89:23: note: expanded from macro 'av_log2'
#define av_log2 ff_log2
^
libavutil/intmath.h:45:29: note: expanded from macro 'ff_log2'
# define ff_log2(x) (31 - __builtin_clz((x)|1))
^
libavutil/samplefmt.c:59:14: error: use of unknown builtin '__builtin_strlen'
if (!strcmp(sample_fmt_info[i].name, name))
^
/usr/include/i386-linux-gnu/bits/string2.h:804:22: note: expanded from macro 'strcmp'
&& (__s1_len = __builtin_strlen (s1), __s2_len = __builtin_strlen (s2), \
^
libavutil/samplefmt.c:59:14: note: did you mean '__builtin_strchr'?
/usr/include/i386-linux-gnu/bits/string2.h:804:22: note: expanded from macro 'strcmp'
&& (__s1_len = __builtin_strlen (s1), __s2_len = __builtin_strlen (s2), \
^
libavutil/samplefmt.c:59:14: error: use of unknown builtin '__builtin_strcmp'
if (!strcmp(sample_fmt_info[i].name, name))
^
/usr/include/i386-linux-gnu/bits/string2.h:807:9: note: expanded from macro 'strcmp'
#define HAVE_FAST_CLZ 1
。当我删除它时,编译就可以了。但令我惊讶的是,当我直接通过gcc编译项目时,没有内置错误(将HAVE_FAST_CLZ设置为1)。你能告诉我为什么只有当我设置clang并添加包含路径时,它才不起作用吗?我很确定我正在添加所有包含路径,所以这不太可能是原因。 - user763410