[LLVMbugs] [Bug 17981] New: compiler-rt fails to compile with "no such sysroot directory: '-fno-builtin'

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17981

            Bug ID: 17981
           Summary: compiler-rt fails to compile with "no such sysroot
                    directory: '-fno-builtin'
           Product: compiler-rt
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: compiler-rt
          Assignee: unassignedbugs at nondot.org
          Reporter: jonathan.sauer at gmx.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

compiler-rt r195016 fails to compile on OS X 10.6.8 with clang r195016 and
make:

% make VERBOSE=1
[...]
COMPILE:   clang_darwin/asan_iossim_dynamic/i386:
/Users/rynnsauer/LLVM/llvm/projects/compiler-rt/lib/asan/asan_allocator2.cc
/Users/rynnsauer/LLVM/build/Release+Asserts/bin/clang -fno-exceptions -fPIC
-funwind-tables -I/Users/rynnsauer/LLVM/llvm/projects/compiler-rt/lib
-I/Users/rynnsauer/LLVM/llvm/projects/compiler-rt/include -arch i386
-fvisibility=hidden -DVISIBILITY_HIDDEN -Wall -Werror -O3 -fomit-frame-pointer
-mios-simulator-version-min=7.0 -isysroot -fno-builtin -gline-tables-only
-DMAC_INTERPOSE_FUNCTIONS=1 -DASAN_FLEXIBLE_MAPPING_AND_OFFSET=1 -c -o
/Users/rynnsauer/LLVM/build/tools/clang/runtime/compiler-rt/clang_darwin/asan_iossim_dynamic/i386/SubDir.lib__asan/asan_allocator2.o
/Users/rynnsauer/LLVM/llvm/projects/compiler-rt/lib/asan/asan_allocator2.cc
clang: error: no such sysroot directory: '-fno-builtin'

The reason seems to be that when the iOS SDK is not installed (as is the case
on my machine), $(IOSSIM_SDK_PATH) in compiler-rt/make/platform/clang_darwin.mk
is empty, so when it is used as part of clang's command line, the result is
"-isysroot -fno-builtin".

I guess when the iOS SDK is not installed, compiler-rt should not be built for
iOS.

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