[Bug 216229] head: (e.g. -r312009): kernel-toolchain: bootstrap-tools stage libllvmminimal can fail for lack of -I options (e.g., from scratch kernel-toolchain)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216229

            Bug ID: 216229
           Summary: head: (e.g. -r312009): kernel-toolchain:
                    bootstrap-tools stage libllvmminimal can fail for lack
                    of -I options (e.g., from scratch kernel-toolchain)
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: markmi at dsl-only.net

[powerpc64 may not be essential but it is the
environment I found this in.]

Background information: libllvmminimal has C++ code, not (just) C code.

[Note that CFLAGS has things like -std=gnu99 that are not appropriate to c++
(clang++).]

So the lines from /usr/src/lib/clang/llvm.build.mk for CFLAGS:

CFLAGS+=        -I${SRCTOP}/lib/clang/include
CFLAGS+=        -I${LLVM_SRCS}/include
CFLAGS+=        -DLLVM_ON_UNIX
CFLAGS+=        -DLLVM_ON_FREEBSD
CFLAGS+=        -D__STDC_LIMIT_MACROS
CFLAGS+=        -D__STDC_CONSTANT_MACROS
#CFLAGS+=       -DNDEBUG
. . .
CFLAGS+=        -DLLVM_DEFAULT_TARGET_TRIPLE=\"${TARGET_TRIPLE}\"
CFLAGS+=        -DLLVM_HOST_TRIPLE=\"${BUILD_TRIPLE}\"
CFLAGS+=        -DDEFAULT_SYSROOT=\"${TOOLS_PREFIX}\"

do not contribute to the C++ compiles for libllvmminimal.

Thus unless the system compiler is in use so that no
bootstrap compiler is to be built. . .

The lack of -I definitions for C++ ends up with build failures
such as below (from a first-time kernel-toolchain example):
(this was a on-powerpc64, targeting powerpc64, example,
not a cross-build)

# Meta data file
/usr/obj/powerpc64vtsc_clang_altbinutils_kernel/powerpc.powerpc64/usr/src/tmp/usr/src/lib/clang/libllvmminimal/_usr_obj_powerpc64vtsc_clang_altbinutils_kernel_powerpc.powerpc64_usr_src_tmp_usr_src_lib_clang_libllvmminimal_Support_APInt.o.meta
CMD clang++  -B/usr/local/powerpc64-freebsd/bin/  -std=c++11 -fno-exceptions
-fno-rtti  -stdlib=libc++ -Wno-c++11-extensions  -c
/usr/src/contrib/llvm/lib/Support/APInt.cpp -o Support/APInt.o
CWD
/usr/obj/powerpc64vtsc_clang_altbinutils_kernel/powerpc.powerpc64/usr/src/tmp/usr/src/lib/clang/libllvmminimal
TARGET Support/APInt.o
-- command output --
/usr/src/contrib/llvm/lib/Support/APInt.cpp:15:10: fatal error:
'llvm/ADT/APInt.h' file not found
#include "llvm/ADT/APInt.h"
         ^
1 error generated.
*** Error code 1


libllvmminimal is not necessarily the only problem but it is the first one
and it is very early (bootstrap-tools stage).

-I is not necessarily the only compile option type that is missing for
libllvmminimal.


[Note: I've a couple of poudriere-devel submittals that may actualyl trace
back to such issues --so poudriere might not be essential to the actual issue.]

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