https://llvm.org/bugs/show_bug.cgi?id=31540
Bug ID: 31540
Summary: libc++ puts libc++abi headers in wrong place in build
area
Product: libc++
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: richard-l...@metafoo.co.uk
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
libc++'s cmake/Modules/HandleLibCXXABI.cmake copies the libc++abi <cxxabi.h>
into the build area. However, instead of copying it to $BUILD/include/c++/v1,
it copies it to $BUILD/include. That seems broken -- a clang binary in
$BUILD/bin doesn't look there, so running the compiler from the build area
results in our being unable to find <cxxabi.h>, which means that header is not
available in stage2 of a simple bootstrap (with no explicit install step).
The cxxabi.h headers should be put next to the libc++ headers in the build
area, just like they are in the install area. However, this appears to cause
the libc++ build itself to fail, because it /does/ have an include path of
$BUILD/include and /does not/ have an include path of $BUILD/include/c++/v1
(which seems reasonable -- we don't want it including headers from some stale
build of the same library). So either we should put these headers in both
places in the build area, or when building libc++ it should pick up cxxabi.h
directly from $SRC/projects/libcxxabi/include.
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