[LLVMbugs] [Bug 15539] New: __has_include seems to be broken under #ifdef

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Mar 18 15:43:43 PDT 2013


            Bug ID: 15539
           Summary: __has_include seems to be broken under #ifdef
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: dblaikie at gmail.com
          Reporter: dblaikie at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

#if FOO
#elif __has_include(<foo>)

compiles without error, however

#ifdef FOO
#elif __has_include(<foo>)


typeinfo.cpp:2:7: error: __has_include must be used within a preprocessing
#elif __has_include(<foo>)
typeinfo.cpp:2:7: error: invalid token at start of a preprocessor expression
<scratch space>:2:1: note: expanded from here
2 errors generated.

(discovered in a change to libc++, r177297)

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