Enable COMPILER_RT_DEFAULT_TARGET_ONLY for all archs

This commit does two things in one go:
1) Enable COMPILER_RT_DEFAULT_TARGET_ONLY for i386 and amd64:

Right now i386/amd64 are building compiler-rt for each other, in
addition to themselves.:
 - libclang-rt-17-dev:amd64 is also shipping the i386 builtins, and
   Depending on libc6-i386:amd64/lib32stdc++:amd64.
 - libclang-rt-17-dev:i386 is also shipping the x86_64 built-ins, and
   Depending on libc6-amd64:i386/lib64stdc++6:i386/lib64atomic1:i386.

Beyond the extra cruft in files and dependencies, this means that the
amd64/i386 packages are shipping conflicting files, and dpkg is refusing
to unpack one in the presence of the other (an RC bug in itself). This
is also identified by the multiarch hinter with the following message:
   libclang-rt-17-dev conflicts on 78 files starting with /usr/lib/llvm-17/lib/clang/17/lib/linux/ on amd64 <-> i386

Let users who want to build e.g. 32-bit binaries in amd64 use multi-arch
for this use case, by installing libclang-rt-17-dev:i386. The
alternative would be to support multi-lib, and ship additional packages
such as libclang-rt-17-dev-i386:amd64 (and vice-versa), but this feels
like an overkill. Multi-lib remains still a possibility with (Debian's)
clang's default, libgcc (lib32gcc/lib64gcc) as well.

2) Enable COMPILER_RT_DEFAULT_TARGET_ONLY unconditionally:

This was being passed in an opt-in basis, via STAGE_ALL_CMAKE_EXTRA for
the following architectures:
  * armel
  * armhf
  * powerpc
  * sparc
  * sparc64
  * s390x
  * mips64el
  * hurd-i386

So, with i386/amd64 also opting-in, this leaves only a few remaining
Debian architectures.

Furthermore, upon inspecting compiler-rt/cmake/base-config-ix.cmake, it
looks like the only architectures that are actually building for
additional (non-default) targets are i386, amd64, powerpc (note: not
ppc64el!), mips*, and arm. Turns out we've disabled that for all of them
now.

Therefore, pass COMPILER_RT_DEFAULT_TARGET_ONLY=ON to all architectures
unconditionally, and thus reduce an additional variation factor.

diff --git a/debian/rules b/debian/rules
index 6f953d47cfc5ea56b09a0ecab7f25404cb0c64ed..0fd35b24c1cdfa1d4a39a91c0bb47eff5b10748a 100755 (executable)
--- a/debian/rules
+++ b/debian/rules
@@ -173,7 +173,6 @@ export CXX=g++-$(GCC_VERSION)
 
 ifneq (,$(findstring $(DEB_HOST_ARCH),armel))
   STAGE_ALL_CMAKE_EXTRA += -DLLVM_HOST_TRIPLE=arm-linux-gnueabi
-  STAGE_ALL_CMAKE_EXTRA += -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
 # align arch profile with debian baseline
 # https://wiki.debian.org/ArmEabiPort
   CFLAGS_EXTRA += -march=armv5t
@@ -189,7 +188,6 @@ endif
 
 ifneq (,$(findstring $(DEB_HOST_ARCH),armhf))
   STAGE_ALL_CMAKE_EXTRA += -DLLVM_HOST_TRIPLE=arm-linux-gnueabihf
-  STAGE_ALL_CMAKE_EXTRA += -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
 # align arch profile with debian baseline
 # https://wiki.debian.org/ArmHardFloatPort#Minimum_CPU_.26_FPU
   CFLAGS_EXTRA += -march=armv7-a -mfpu=vfpv3-d16
@@ -210,7 +208,6 @@ endif
 
 ifneq (,$(filter $(DEB_HOST_ARCH),powerpc))
   STAGE_ALL_CMAKE_EXTRA += -DLLVM_HOST_TRIPLE=powerpc-linux-gnu
-  STAGE_ALL_CMAKE_EXTRA += -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
 endif
 
 # debug symbols OOM in Ubuntu Ubuntu and slows down build process.
@@ -222,19 +219,16 @@ endif
 
 ifneq (,$(filter $(DEB_HOST_ARCH),sparc))
   STAGE_ALL_CMAKE_EXTRA += -DLLVM_HOST_TRIPLE=sparc-linux-gnu
-  STAGE_ALL_CMAKE_EXTRA += -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
   STAGE_ALL_CMAKE_EXTRA += -DLLVM_PARALLEL_LINK_JOBS=4
 endif
 
 ifneq (,$(filter $(DEB_HOST_ARCH),sparc64))
   STAGE_ALL_CMAKE_EXTRA += -DLLVM_HOST_TRIPLE=sparc64-linux-gnu
-  STAGE_ALL_CMAKE_EXTRA += -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
   STAGE_ALL_CMAKE_EXTRA += -DLLVM_PARALLEL_LINK_JOBS=4
 endif
 
 ifneq (,$(filter $(DEB_HOST_ARCH),s390x))
   STAGE_ALL_CMAKE_EXTRA += -DLLVM_HOST_TRIPLE=s390x-linux-gnu
-  STAGE_ALL_CMAKE_EXTRA += -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
   LIBCXX_EXCEPTIONS := OFF
 # disable compiler-rt builtins (not supported for s390x)
   STAGE_ALL_CMAKE_EXTRA += -DCOMPILER_RT_BUILD_BUILTINS=OFF
@@ -243,7 +237,6 @@ ifneq (,$(filter $(DEB_HOST_ARCH),s390x))
 endif
 
 ifneq (,$(filter $(DEB_HOST_ARCH),mips64el))
-  STAGE_ALL_CMAKE_EXTRA += -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
   STAGE_ALL_CMAKE_EXTRA += -DCOMPILER_RT_BUILD_BUILTINS=OFF
   COMPILER_RT_USE_BUILTINS_LIBRARY := OFF
   LIBCXX_USE_COMPILER_RT := OFF
@@ -258,7 +251,6 @@ ifneq (,$(filter $(DEB_HOST_ARCH),x32))
 endif
 
 ifneq (,$(filter $(DEB_HOST_ARCH),hurd-i386))
-  STAGE_ALL_CMAKE_EXTRA += -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
 endif
 
 ifeq ($(shell dpkg --compare-versions $(shell dpkg-query -W -f '$${Version}' g++-$(GCC_VERSION)) ge 4.8-20121128-1~ ; echo $$?),0)
@@ -756,6 +748,7 @@ endif
        -DCOMPILER_RT_INCLUDE_TESTS=OFF \
        -DCOMPILER_RT_USE_LIBCXX=OFF \
        -DCOMPILER_RT_USE_BUILTINS_LIBRARY=$(COMPILER_RT_USE_BUILTINS_LIBRARY) \
+       -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON \
        -DLIBUNWIND_USE_COMPILER_RT=ON \
        -DLIBUNWIND_INSTALL_LIBRARY=OFF \
        -DLIBCXXABI_ENABLE_EXCEPTIONS=$(LIBCXX_EXCEPTIONS) \
@@ -777,7 +770,7 @@ endif
        -DRUNTIMES_CMAKE_ARGS="-DCMAKE_C_FLAGS=$(STAGE_1_CFLAGS);-DCMAKE_CXX_FLAGS=$(STAGE_1_CXXFLAGS);-DCMAKE_EXE_LINKER_FLAGS=$(STAGE_1_LDFLAGS);-DCMAKE_SHARED_LINKER_FLAGS=$(STAGE_1_LDFLAGS);-DCMAKE_MODULE_LINKER_FLAGS=$(STAGE_1_LDFLAGS);-DCMAKE_BUILD_TYPE=Release;-DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=OFF" \
        -DCLANG_ENABLE_BOOTSTRAP=ON \
        -DCLANG_BOOTSTRAP_TARGETS="$(ENABLED_STAGE2_CMAKE_BUILD_TARGETS)" \
-       -DCLANG_BOOTSTRAP_PASSTHROUGH="CMAKE_INSTALL_PREFIX;CMAKE_SUPPRESS_REGENERATION;ENABLE_LINKER_BUILD_ID;LLVM_ENABLE_PIC;LLVM_ENABLE_RTTI;LLVM_INCLUDE_GO_TESTS;LLVM_USE_RELATIVE_PATHS_IN_FILES;CLANG_DEFAULT_LINKER;CLANG_DEFAULT_CXX_STDLIB;CLANG_DEFAULT_RTLIB;COMPILER_RT_USE_LIBCXX;COMPILER_RT_USE_BUILTINS_LIBRARY;COMPILER_RT_INCLUDE_TESTS;LIBUNWIND_USE_COMPILER_RT;LIBCXXABI_ENABLE_EXCEPTIONS;LIBCXXABI_USE_COMPILER_RT;LIBCXX_USE_COMPILER_RT;LIBCXX_ENABLE_EXCEPTIONS;LIBCXX_ENABLE_STATIC_ABI_LIBRARY;LIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY;LIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY;LIBOMP_ENABLE_RTTI;LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN;CLANG_FORCE_MATCHING_LIBCLANG_SOVERSION;CMAKE_C_COMPILER_LAUNCHER;CMAKE_CXX_COMPILER_LAUNCHER" \
+       -DCLANG_BOOTSTRAP_PASSTHROUGH="CMAKE_INSTALL_PREFIX;CMAKE_SUPPRESS_REGENERATION;ENABLE_LINKER_BUILD_ID;LLVM_ENABLE_PIC;LLVM_ENABLE_RTTI;LLVM_INCLUDE_GO_TESTS;LLVM_USE_RELATIVE_PATHS_IN_FILES;CLANG_DEFAULT_LINKER;CLANG_DEFAULT_CXX_STDLIB;CLANG_DEFAULT_RTLIB;COMPILER_RT_USE_LIBCXX;COMPILER_RT_USE_BUILTINS_LIBRARY;COMPILER_RT_DEFAULT_TARGET_ONLY;COMPILER_RT_INCLUDE_TESTS;LIBUNWIND_USE_COMPILER_RT;LIBCXXABI_ENABLE_EXCEPTIONS;LIBCXXABI_USE_COMPILER_RT;LIBCXX_USE_COMPILER_RT;LIBCXX_ENABLE_EXCEPTIONS;LIBCXX_ENABLE_STATIC_ABI_LIBRARY;LIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY;LIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY;LIBOMP_ENABLE_RTTI;LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN;CLANG_FORCE_MATCHING_LIBCLANG_SOVERSION;CMAKE_C_COMPILER_LAUNCHER;CMAKE_CXX_COMPILER_LAUNCHER" \
        -DBOOTSTRAP_CMAKE_BUILD_TYPE=RelWithDebInfo \
        -DBOOTSTRAP_CMAKE_C_FLAGS_RELWITHDEBINFO="$(opt_flags)" \
        -DBOOTSTRAP_CMAKE_CXX_FLAGS_RELWITHDEBINFO="$(opt_flags)" \