[cfe-users] Fwd: Re: [llvm-dev] Overriding macro values defined in source code
Sudhindra kulkarni via cfe-users
cfe-users at lists.llvm.org
Thu May 9 22:47:31 PDT 2019
Thanks Richard for the answer.
I have another question regarding the include(-I) option.
If we have a c file called cfile.c and a header file called header.h both
in the same directory say (dir x). cfile.c includes header.h as shown below
And if in some other directory say (dir y)we have another header file with
the same name(header.h) but with a different content then when I try to
generate the preprocessed file using the below command,
clang.exe -E path of cfile.c -I path of dir y
The header.h present in the directory dir x is getting considered even
though -I points to dir y.
Is this the intended behavior that the current directory is searched first
for the header files irrespective of the directory provided against the -I
If not how to make clang consider only the directories provided against the
-I option and not the current directory.
Thanks in advance
On May 9, 2019 5:01 AM, "Richard Smith" <richard at metafoo.co.uk> wrote:
On Mon, 6 May 2019 at 23:09, Sudhindra kulkarni via cfe-users
<cfe-users at lists.llvm.org> wrote:
> ---------- Forwarded message ----------
> From: "Tim Northover" <t.p.northover at gmail.com>
> Date: May 1, 2019 3:48 PM
> Subject: Re: [llvm-dev] Overriding macro values defined in source code
> To: "Sudhindra kulkarni" <sudhindrakkulkarni102 at gmail.com>
> Cc: "LLVM Developers Mailing List" <llvm-dev at lists.llvm.org>
> On Tue, 30 Apr 2019 at 22:28, Sudhindra kulkarni via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> > Is it possible to override the value of AVAL through the -D option?
> > For eg is it possible to set the value of AVAL to 2 through -D in clang
> This is more a question for the cfe-users list, but as far as I know
> there's no way to prevent redefinitions in source files.
> Hi Team,
> Consider the below C code,
> #define AVAL 5
> void func()
> int a=5;
> //Do something
> //Do something else
> My question is
> Is it possible to override the value of AVAL through the -D option?
> For eg is it possible to set the value of AVAL to 2 through -D in clang
so that the else part executes?
> Also apart from -D option we are also open to other ways of achieving this
The normal approach is to change the source to something like
#define AVAL 5
> Thanks in advance
> cfe-users mailing list
> cfe-users at lists.llvm.org
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