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 #include "header.h" 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 option. 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" <[email protected]> wrote: On Mon, 6 May 2019 at 23:09, Sudhindra kulkarni via cfe-users <[email protected]> wrote: > > > ---------- Forwarded message ---------- > From: "Tim Northover" <[email protected]> > Date: May 1, 2019 3:48 PM > Subject: Re: [llvm-dev] Overriding macro values defined in source code > To: "Sudhindra kulkarni" <[email protected]> > Cc: "LLVM Developers Mailing List" <[email protected]> > > On Tue, 30 Apr 2019 at 22:28, Sudhindra kulkarni via llvm-dev > <[email protected]> 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. > > Cheers. > > Tim. > > Hi Team, > Consider the below C code, > #define AVAL 5 > void func() > { > int a=5; > if(a==AVAL) > { > //Do something > } > else > { > //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 #ifndef AVAL #define AVAL 5 #endif > Thanks in advance > _______________________________________________ > cfe-users mailing list > [email protected] > https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users
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