[LLVM][AIX] Prefer a 32-bit default target triple on AIX

If the user doesn't specify a default target triple, the LLVM CMake usually defaults us into the host triple. This is a problem when building Clang/LLVM on 64-bit AIX (i.e. powerpc64-ibm-aix), as the host toolchain (e.g. ar, ld, nm, dump) all expect the compiler to generate 32-bit objects by default (which both GCC and XL on the platform do) and will hard error if passed a 64-bit object without an explicit option or environment setting. This breaks downstream consumers, such as builds generated with build tools like CMake, which when they invoke clang, etc. without explicit bitmode flags also expect 32-bit mode.

This patch changes the default target selection when the host is powerpc64-ibm-aix to prefer powerpc-ibm-aix to avoid these issues. We don't update the runtimes/CMakeList.txt since the default is less meaningful as we assume runtimes will need to build for both targets anyways.

Differential Revision: https://reviews.llvm.org/D118377

diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index a5245c2..5596ced 100644 (file)
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -727,8 +727,15 @@ set(LLVM_PROFDATA_FILE "" CACHE FILEPATH
 include(config-ix)
 
 # By default, we target the host, but this can be overridden at CMake
-# invocation time.
-set(LLVM_DEFAULT_TARGET_TRIPLE "${LLVM_HOST_TRIPLE}" CACHE STRING
+# invocation time. Except on 64-bit AIX, where the system toolchain
+# expect 32-bit objects by default.
+if("${LLVM_HOST_TRIPLE}" MATCHES "^powerpc64-ibm-aix")
+  string(REGEX REPLACE "^powerpc64" "powerpc" LLVM_DEFAULT_TARGET_TRIPLE_default "${LLVM_HOST_TRIPLE}")
+else()
+  set(LLVM_DEFAULT_TARGET_TRIPLE_default "${LLVM_HOST_TRIPLE}")
+endif()
+
+set(LLVM_DEFAULT_TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE_default}" CACHE STRING
   "Default target for which LLVM will generate code." )
 set(TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE}")
 message(STATUS "LLVM host triple: ${LLVM_HOST_TRIPLE}")