[jira] [Created] (PROTON-2365) Build failure without C++

["Fabrice Fontaine (Jira)" <ji...@apache.org>]

Fabrice Fontaine created PROTON-2365:
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             Summary: Build failure without C++
                 Key: PROTON-2365
                 URL: https://issues.apache.org/jira/browse/PROTON-2365
             Project: Qpid Proton
          Issue Type: Bug
          Components: build
    Affects Versions: proton-c-0.33.0
            Reporter: Fabrice Fontaine
         Attachments: 0003-CMakeLists.txt-fix-build-without-C.patch

For an unknown reason, the following build failure is raised when the toolchain does not have a working C++ compiler (with cmake 3.18.4):

 
{code:java}
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:73 (enable_language):
 The CMAKE_CXX_COMPILER:
/home/giuliobenetti/autobuild/run/instance-3/output-1/host/bin/arm-linux-g++
is not a full path to an existing compiler tool.
Tell CMake where to find the compiler by setting either the environment
 variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
 to the compiler, or to the compiler name if it is in the PATH.

-- Configuring incomplete, errors occurred!
{code}
I don't understand why this build failure is raised because enable_language(CXX) is correctly protected by
{code:java}
check_language (CXX)
if (CMAKE_CXX_COMPILER){code}
Perhaps, there is a bug inside cmake, to fix it, check for BUILD_CPP



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