https://bugs.llvm.org/show_bug.cgi?id=42500
Bug ID: 42500
Summary: clang doesn't include two headers symlinked to the
same target
Product: clang
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Driver
Assignee: unassignedclangb...@nondot.org
Reporter: ka...@codesynthesis.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Created attachment 22191
--> https://bugs.llvm.org/attachment.cgi?id=22191&action=edit
Test program
Hello,
My system is Fedora 28 with clang 6.0.1 installed as the
clang-6.0.1-2.fc28.x86_64 package.
When compiling a C source file that includes two headers which are different
symlinks to the same target, then the second header is not included.
The issue is reproduced by the attached test program:
$ tar xfz test.tar.gz
$ cd test
$ tree --charset ascii
.
|-- a
| |-- linux.h
| `-- platform.h -> ../platform.h
|-- b
| |-- linux.h
| `-- platform.h -> ../platform.h
|-- main.c
`-- platform.h
$ clang -I. main.c
main.c:8:7: error: use of undeclared identifier 'B'
r = B;
^
1 error generated.
The only explanation why the macro B is not defined is that the header
b/platform.h is not included.
Note that gcc compiles with no errors:
$ gcc -I. main.c
$ ls a.out
a.out
Also note that if to replace the b/platform.h symlink with its target then
clang compiles with no errors either:
$ rm a.out b/platform.h
$ cp platform.h b/
$ clang -I. main.c
$ ls a.out
a.out
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