Provide path to Solaris.h include (Bug 28370)

[ro]

Summary

Fix for bug 28370, originally submitted to llvm-commits

http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160627/369316.html

and approved

http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20161024/399906.html

[krytarowski]

My personal opinion is that -include is the wrong way of doing the work.

At least part of this code (endian) perhaps should go to include/llvm/Support/Host.h.

[fedor.sergeev]

In D33716#772362, @krytarowski wrote:

My personal opinion is that -include is the wrong way of doing the work.

While generally I would agree with this sentiment, there is one part of Solaris.h which is very hard to do w/o -include.
I mean all those #undef ES/DS register macro names, that pollute user space after including Solaris sys/regset.h.
You need to perform these undefs immediately after the first include of regset.h, otherwise you are doomed
to hit confusing results of the aforementioned pollution (that nobody else sees on other platforms!).

[fedor.sergeev]

Please, see https://reviews.llvm.org/D34136 for a presumably better fix.

[ro]

Superceded by https://reviews.llvm.org/D34136.

CMakeLists.txt

 endif(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
 
 if( ${CMAKE_SYSTEM_NAME} MATCHES SunOS )
-   SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -include llvm/Support/Solaris.h")
+   SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -include ${LLVM_MAIN_INCLUDE_DIR}/llvm/Support/Solaris.h")
 endif( ${CMAKE_SYSTEM_NAME} MATCHES SunOS )
 
 # Make sure we don't get -rdynamic in every binary. For those that need it,