For (1) on my Linux
clang -cc1 -help
shows options of the compiler proper including ast-dump but I didn't get
syntax-only.
Nigel
From: cfe-users <cfe-users-boun...@lists.llvm.org> On Behalf Of Ray Mitchell
via cfe-users
Sent: 26 March 2021 00:25
To: cfe-users@lists.llvm.org
Subject: [cfe-users] Some basic AST file generation questions
Win10-64, clang v11.0.0, VS2019
When I enter "clang.exe -help" from the command line I get a long list of clang
options, and one of them is "-Xclang <arg>". Thanks to previous help from a
member of the cfe-users digest, I am able to do "clang.exe -Xclang -ast-dump
-fsyntax-only SourceFile.c" to get the AST file for my source file. I have
some basic questions about all this:
1. I may have asked this before, but I've forgotten :-( The -ast-dump and
-fsyntax-only options above are not listed when I enter "clang.exe -help". Is
there a command line option that will list these and all other options that are
missing from the basic -help list? If so, what is it? If not, specifically
where can I find these additional options listed and described?
2. All of the following code I describe compiles, links, and runs correctly: I
have an include guard protected header file named MyClass.h that includes a
couple standard library headers followed by the declaration of a const variable
followed by the definition of C++ class named MyClass followed by the
definition of an inline function. When I do "clang.exe -Xclang -ast-dump
-fsyntax-only MyClass.h" the resulting AST file contains the typical AST
information from the two included header files, but only contains the two
following lines for my code:
|-VarDecl 0xb1ba010 <C:\MyClass.h:23:1, col:7> col:7 invalid MyClass 'int'
`-VarDecl 0xb1ba060 <line:41:1, col:13> col:13 invalid MyClass 'void'
When I look at the AST files produced for any of my implementation files that
contain #include "MyClass.h", the complete AST information for MyClass.h is
there. Why is most of that AST information missing from the AST file produced
directly from MyClass.h and how can I cause it to be there?
Thank you :-)
Ray
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