[cfe-dev] clang -cc1 error : file not found

[Neil Semmel]

Hello,

The -cc1 flag is useful in some cases, but if you just want to print the
ast, you can use the -Xclang switch as well. -cc1 will remove all builtin
settings from clang, which includes standard defines, and standard include
paths. -Xclang gives you access to the full set of clang flags for the next
argument, it's like passing it to "clang -cc1" directly, but doesn't
require all of the include paths etc to be set.

$ clang -fsyntax-only -Xclang -ast-dump ./test.c

or

$ clang -Xclang -ast-dump -o test ./test.c

when using -cc1, you must specify all include paths, and any other "normal"
settings that clang would use for c/c++ compilation. If you do

$ clang -v -o test ./test.c

you should be able to see the full clang command with the -cc1 argument.

But, since you're interested in dumping the ast, "-Xclang -ast-dump" is all
you need.

Neil

On Thu, Mar 19, 2015 at 4:14 AM, 汪雷 <wangcppclei at gmail.com> wrote:

> Hi, everyone!
> I have a simple source file test.c,as follow:
> ># include<stdio.h>
> >int main() {
> >  printf("Hello World\n");
> >  return 0;
> >}
>
> When I use command:$ clang test.c -o test .It's OK, and generate the test
> executable.
> But, when use command:$ clang test.c -cc1 test.c -o test  or
> command:$clang -cc1 test.c -ast-print .Error occur.
> :test.c:1:9: fatal error: 'stdio.h' file not found
>
> The office docments say that:"Users should not run clang -cc1 directly,
> because -cc1 options are not guaranteed to be stable"  from:
> http://clang.llvm.org/docs/FAQ.html
> Now I want to print the ast..
> The platform is ubuntu14.04, LLVM version is 3.6, the same to 3.5.
> I want to print the ast. Is there anyone can help me? Thinks very much^.^
>
> _______________________________________________
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> cfe-dev at cs.uiuc.edu
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>
>
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