[llvm-dev] 3 stage ninja bootstrap on darwin?

[Stefan Gränitz via llvm-dev]

Hi all

I just ran into the same issue Jack described below.
I did a 2-stage build of LLVM/Clang/Compiler-rt on the current
release_50 branch.

Versions:
OSX 10.12.6, Xcode 8.0, CMake 1.8.2, Ninja 1.7.2, Ccache 3.3.4

Log:
$ cmake -G Ninja -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
-DCMAKE_BUILD_TYPE=Release
-DLLVM_ENABLE_LTO=ON
-DLLVM_TARGETS_TO_BUILD=host
-DLLVM_CREATE_XCODE_TOOLCHAIN=ON
-DLLVM_INCLUDE_TESTS=ON
-DLLVM_INCLUDE_EXAMPLES=OFF
-DLLVM_INCLUDE_DOCS=OFF
-DLLVM_ENABLE_PROJECTS="clang;compiler-rt;lldb"
-DCLANG_ENABLE_BOOTSTRAP=ON ../llvm
-- The C compiler identification is AppleClang 8.0.0.8000038
-- The CXX compiler identification is AppleClang 8.0.0.8000038
...
-- Build files have been written to:
/media/Dev/llvm50/build-ninja-clang-release
$ ninja stage2
...
-- Performing Test LLVM_NO_OLD_LIBSTDCXX
-- Performing Test LLVM_NO_OLD_LIBSTDCXX - Failed
CMake Error at cmake/modules/CheckCompilerVersion.cmake:38 (message):
Host Clang must be able to find libstdc++4.8 or newer!
Call Stack (most recent call first):
cmake/config-ix.cmake:14 (include)
CMakeLists.txt:584 (include)

Hack to force LLVM_ENABLE_LIBCXX=ON:
diff --git a/cmake/modules/CheckCompilerVersion.cmake
b/cmake/modules/CheckCompilerVersion.cmake
index 2e8f5445781..38ec06c7631 100644
--- a/cmake/modules/CheckCompilerVersion.cmake
+++ b/cmake/modules/CheckCompilerVersion.cmake
@@ -1,6 +1,7 @@
 # Check if the host compiler is new enough. LLVM requires at least GCC 4.8,
 # MSVC 2015 (Update 3), or Clang 3.1.
 
+set(LLVM_ENABLE_LIBCXX ON)
 include(CheckCXXSourceCompiles)
 
 if(NOT DEFINED LLVM_COMPILER_CHECKED)

Maybe it just got messed up. However, I never explicitly pass
-DLLVM_ENABLE_LIBCXX=ON and it never caused problems in single-stage
builds,
as on OSX the setting defaults to ON. Shouldn't that be the same for
2-stage
out of the box? Maybe stage 1 passes an invalid setting to the stage 2
configuration that overrides the otherwise correct default?

Cheers
Stefan

>   Is anyone using the 3 stage bootstrap described under 3-Stage
> Non-Determinism at http://llvm.org/docs/AdvancedBuilds.html
> <http://llvm.org/docs/AdvancedBuilds.html>? I am
> trying to build against the MacPorts current python2.7, ninja and make
> releases, a build of current trunk for llvm, compiler-rt, cfe and
> clang-tools-extra using...
> % cmake -DLLVM_LINK_LLVM_DYLIB:BOOL=ON
> -DCOMPILER_RT_ENABLE_IOS:BOOL=OFF -DLLVM_LIT_ARGS:STRING=-v
> -DPYTHON_EXECUTABLE:FILEPATH=/opt/local/bin/python2.7
> -DLLVM_ENABLE_ASSERTIONS:BOOL=OFF -DCMAKE_OSX_SYSROOT:STRING=/
> -DCMAKE_OSX_DEPLOYMENT_TARGET:STRING=
> -DLLVM_TARGETS_TO_BUILD="X86;PowerPC;ARM"
> -DCMAKE_INSTALL_PREFIX:PATH=/Users/howarth/dist
> -DCMAKE_BUILD_TYPE:STRING=Release -DLLVM_ENABLE_LIBCXX:BOOL=ON -G
> Ninja -C /Users/howarth/3stage/cfe-5.0.0.src/cmake/caches/3-stage.cmake
> ../llvm-5.0.0.src
> % ninja stage3
> on x86_64-apple-darwin16 using the Xcode 8.3 Beta 5 devtools as the
> system compiler. The build is tripping up on the error...
> -- Performing Test LLVM_NO_OLD_LIBSTDCXX
> -- Performing Test LLVM_NO_OLD_LIBSTDCXX - Failed
> CMake Error at cmake/modules/CheckCompilerVersion.cmake:38 (message):
>   Host Clang must be able to find libstdc++4.8 or newer!
> Call Stack (most recent call first):
>   cmake/config-ix.cmake:14 (include)
>   CMakeLists.txt:559 (include)
> where is seems that -DLLVM_ENABLE_LIBCXX:BOOL=ON isn't getting passed
> down to from stage1 to the stage2 configuration step. Any ideas on how
> to work around this for a build against the system livc+++ under
> Sierra?
>          Jack

-- 
https://weliveindetail.github.io/blog/
https://cryptup.org/pub/stefan.graenitz@gmail.com

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