RSB fails to build 6/rtems-llvm on Ubuntu 20.04 LTS

[kgardas]

Hello,

and attempt to use current (as of 2023-08-02) RSB source code to build 6/rtems-llvm on Ubuntu 20.04 LTS failes in three steps:

(1) compilation of swig fails with:

+ export CC_FOR_BUILD CXX_FOR_BUILD CFLAGS_FOR_BUILD CXXFLAGS_FOR_BUILD LDFLAGS_FOR_BUILD LDLIBS_FOR_BUILS LIBS_FOR_BUILS
+ /bin/cp /export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/sources/pcre-8.40.tar.bz2 pcre-8.40.tar.bz2
/bin/cp: cannot stat '/export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/sources/pcre-8.40.tar.bz2': No such file or directory

looks like swig depends on pcre hence try to build it, but it's not downloaded at all. When I cheat and put required tarball into the source directory compilation is able to proceed to compiling LLVM.

(2) however compilation of LLVM fails very quickly with:

-- Check size of el_rfunc_t
-- Check size of el_rfunc_t - done
-- Found libedit: /usr/include (found version ".") 
-- Found Doxygen: /usr/bin/doxygen (found version "1.8.17") found components: doxygen dot 
CMake Error at /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146 (message):
  Could NOT find SWIG (missing: SWIG_EXECUTABLE SWIG_DIR)
Call Stack (most recent call first):
  /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:393 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake-3.16/Modules/FindSWIG.cmake:64 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  tools/lldb/scripts/CMakeLists.txt:18 (find_package)


-- Configuring incomplete, errors occurred!
See also "/export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/build/CMakeFiles/CMakeOutput.log".
See also "/export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/build/CMakeFiles/CMakeError.log".
shell cmd failed: /bin/sh -ex  /export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/do-build
error: building rtems-llvm-8.0.1-x86_64-linux-gnu-1

and although RSB prefer to install its own tools like swig failing above, I've gone ahead and install swig from Ubuntu package and rerun again.

(3) this time LLVM proceed to compilation and then fails with:

[ 12%] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/Threading.cpp.o
[ 12%] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/Valgrind.cpp.o
[ 12%] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/Watchdog.cpp.o
In file included from /export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/llvm-8.0.1/lib/Support/Path.cpp:1110:
/export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/llvm-8.0.1/lib/Support/Unix/Path.inc: In function 'std::string llvm::sys::fs::getMainExecutable(const char*, void*)':
/export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/llvm-8.0.1/lib/Support/Unix/Path.inc:111:38: warning: '__builtin___snprintf_chk' output may be truncated before the last format character [-Wformat-truncation=]
  111 |   snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
      |                                      ^
In file included from /usr/include/stdio.h:867,
                 from /usr/include/c++/9/cstdio:42,
                 from /usr/include/c++/9/ext/string_conversions.h:43,
                 from /usr/include/c++/9/bits/basic_string.h:6496,
                 from /usr/include/c++/9/string:55,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iterator:64,
                 from /export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/llvm-8.0.1/include/llvm/ADT/iterator_range.h:22,
                 from /export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/llvm-8.0.1/include/llvm/ADT/SmallVector.h:17,
                 from /export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/llvm-8.0.1/include/llvm/ADT/Twine.h:13,
                 from /export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/llvm-8.0.1/include/llvm/Support/Path.h:19,
                 from /export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/llvm-8.0.1/lib/Support/Path.cpp:14:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:67:35: note: '__builtin___snprintf_chk' output 2 or more bytes (assuming 4097) into a destination of size 4096
   67 |   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      |          ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   68 |        __bos (__s), __fmt, __va_arg_pack ());
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 12%] Linking CXX static library ../libLLVMSupport.a
[ 12%] Linking CXX static library ../../libLLVMDebugInfoPDB.a
[ 12%] Built target LLVMSupport
[ 12%] Built target LLVMDebugInfoPDB
make: *** [Makefile:152: all] Error 2
shell cmd failed: /bin/sh -ex  /export/home/rtems/git/rtems/rtems-source-builder-ref/rtems/build/rtems-llvm-8.0.1-x86_64-linux-gnu-1/do-build
error: building rtems-llvm-8.0.1-x86_64-linux-gnu-1

I guess whole this LLVM toolchain deserves update to 16.x before investigating failure of more than 4 years old LLVM code here.