-include ignores includepath

[EdSchouten]

Bugzilla Link	3992
Resolution	FIXED
Resolved on	Mar 12, 2010 00:57
Version	unspecified
OS	FreeBSD
Blocks	#4068
CC	@pwo

Extended Description

$ cat test.c
int
main(int argc, char *argv[])
{

foo();

}
$ cat foo/test.h
#include <stdio.h>

void foo(void) { puts("Hi"); }
$ cc -o test -Ifoo -include test.h test.c
In file included from :106:
:1:10: fatal error: '/home/ed/test.h' file not found
#include "/home/ed/test.h"
^
1 diagnostic generated.
$ gcc -o test -Ifoo -include test.h test.c
$ ./test
Hi

As you can see, the -include preprocessor option ignores the include paths. This prevents us from building OpenSSL.

[EdSchouten]

OpenSSH, not OpenSSL.

[lattner]

I think this is because of the realpath stuff daniel added?

[llvmbot]

Looks like it.

I think to fix this properly we will need to have the predefines buffer have a File Entry...

[llvmbot]

Test case from Robert Purves:

$ touch test.c
$ mkdir headers
$ touch headers/test.h
$ gcc -c test.c -I./headers -include test.h
$ clang -c test.c -I./headers -include test.h
In file included from :103:
:1:10: fatal error: '/Users/rp/test.h' file not found
#include "/Users/rp/test.h"
^

[llvmbot]

I added another workaround which I think should make -include work for almost all actual use cases:
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20090420/016073.html

[pwo]

This fixed OpenSSH and pam_ssh on FreeBSD. Resolved/Fixed?

[lattner]

great!