Revert "[Driver] Default CLANG_DEFAULT_PIE_ON_LINUX to ON"

See post-commit discussion on https://reviews.llvm.org/D120305.
This change breaks the clang-ppc64le-rhel buildbot, though
there is suspicion that it's an issue with the bot. The change
also had a larger than expected impact on compile-time and
code-size.

This reverts commit 3c4ed02698
and some followup changes.

clang/CMakeLists.txt

@@ -245,7 +245,7 @@ set(PPC_LINUX_DEFAULT_IEEELONGDOUBLE OFF CACHE BOOL
 set(CLANG_SPAWN_CC1 OFF CACHE BOOL
     "Whether clang should use a new process for the CC1 invocation")
 
-option(CLANG_DEFAULT_PIE_ON_LINUX "Default to -fPIE and -pie on linux-gnu" ON)
+option(CLANG_DEFAULT_PIE_ON_LINUX "Default to -fPIE and -pie on Linux" OFF)
 
 # TODO: verify the values against LangStandards.def?
 set(CLANG_DEFAULT_STD_C "" CACHE STRING

clang/docs/ReleaseNotes.rst

@@ -183,12 +183,6 @@ Internal API Changes
 Build System Changes
 --------------------
 
-* CMake ``-DCLANG_DEFAULT_PIE_ON_LINUX=ON`` is now the default. This is used by
-  linux-gnu systems to decide whether ``-fPIE -pie`` is the default (instead of
-  ``-fno-pic -no-pie``). This matches GCC installations on many Linux distros.
-  Note: linux-android and linux-musl always default to ``-fPIE -pie``, ignoring
-  this variable. ``-DCLANG_DEFAULT_PIE_ON_LINUX`` will be removed in the future.
-
 AST Matchers
 ------------
 

clang/test/Driver/hip-fpie-option.hip

@@ -1,15 +1,15 @@
-// REQUIRES: clang-driver, amdgpu-registered-target, default-pie-on-linux
+// REQUIRES: clang-driver, amdgpu-registered-target
 
 // -fPIC and -fPIE only affects host relocation model.
 // device compilation always uses PIC. 
 
 // RUN: %clang -### -target x86_64-unknown-linux-gnu \
 // RUN:   --offload-arch=gfx906 %s -nogpulib -nogpuinc \
-// RUN:   2>&1 | FileCheck -check-prefixes=DEV,HOST-PIE %s
+// RUN:   2>&1 | FileCheck -check-prefixes=DEV,HOST-STATIC %s
 
 // RUN: %clang -### -target x86_64-unknown-linux-gnu \
 // RUN:   -fgpu-rdc --offload-arch=gfx906 %s -nogpulib -nogpuinc \
-// RUN:   2>&1 | FileCheck -check-prefixes=DEV,HOST-PIE %s
+// RUN:   2>&1 | FileCheck -check-prefixes=DEV,HOST-STATIC %s
 
 // RUN: %clang -### -target x86_64-unknown-linux-gnu \
 // RUN:   --offload-arch=gfx906 %s -nogpulib -nogpuinc \
@@ -32,6 +32,7 @@
 // RUN:   2>&1 | FileCheck -check-prefixes=DEV,HOST-PIE %s
 
 // DEV-DAG: {{".*clang.*".* "-triple" "amdgcn-amd-amdhsa".* "-mrelocation-model" "pic" "-pic-level" "[1|2]".* "-mframe-pointer=all"}}
+// HOST-STATIC-DAG: {{".*clang.*".* "-triple" "x86_64-unknown-linux-gnu".* "-mrelocation-model" "static"}}
 // HOST-PIC-DAG: {{".*clang.*".* "-triple" "x86_64-unknown-linux-gnu".* "-mrelocation-model" "pic" "-pic-level" "2"}}
 // HOST-PIC-NOT: "-pic-is-pie"
 // HOST-PIE-DAG: {{".*clang.*".* "-triple" "x86_64-unknown-linux-gnu".* "-mrelocation-model" "pic" "-pic-level" "2" "-pic-is-pie"}}

compiler-rt/test/crt/lit.cfg.py

@@ -93,6 +93,3 @@ config.suffixes = ['.c', '.cpp']
 
 if config.host_os not in ['Linux']:
     config.unsupported = True
-# FIXME https://github.com/llvm/llvm-project/issues/54084
-if config.host_arch in ['ppc64', 'ppc64le']:
-    config.unsupported = True

compiler-rt/test/lsan/lit.common.cfg.py

@@ -74,9 +74,9 @@ config.substitutions.append( ("%clang_lsan ", build_invocation(clang_lsan_cflags
 config.substitutions.append( ("%clangxx_lsan ", build_invocation(clang_lsan_cxxflags)) )
 
 # LeakSanitizer tests are currently supported on
-# Android{aarch64, x86, x86_64}, x86-64 Linux, arm Linux, mips64 Linux, s390x Linux and x86_64 Darwin.
+# Android{aarch64, x86, x86_64}, x86-64 Linux, PowerPC64 Linux, arm Linux, mips64 Linux, s390x Linux and x86_64 Darwin.
 supported_android = config.android and config.target_arch in ['x86_64', 'i386', 'aarch64'] and 'android-thread-properties-api' in config.available_features
-supported_linux = (not config.android) and config.host_os == 'Linux' and config.host_arch in ['aarch64', 'x86_64', 'mips64', 'riscv64', 'arm', 'armhf', 'armv7l', 's390x']
+supported_linux = (not config.android) and config.host_os == 'Linux' and config.host_arch in ['aarch64', 'x86_64', 'ppc64', 'ppc64le', 'mips64', 'riscv64', 'arm', 'armhf', 'armv7l', 's390x']
 supported_darwin = config.host_os == 'Darwin' and config.target_arch in ['x86_64']
 supported_netbsd = config.host_os == 'NetBSD' and config.target_arch in ['x86_64', 'i386']
 if not (supported_android or supported_linux or supported_darwin or supported_netbsd):

compiler-rt/test/sanitizer_common/lit.common.cfg.py

@@ -81,7 +81,3 @@ if not config.parallelism_group:
 
 if config.host_os == 'NetBSD':
   config.substitutions.insert(0, ('%run', config.netbsd_noaslr_prefix))
-
-# FIXME https://github.com/llvm/llvm-project/issues/54084
-if config.host_arch in ['ppc64', 'ppc64le']:
-  config.unsupported = True

lldb/test/API/functionalities/tail_call_frames/unambiguous_sequence/TestUnambiguousTailCalls.py

@@ -2,7 +2,6 @@ from lldbsuite.test import lldbinline
 from lldbsuite.test import decorators
 
 decor = [decorators.skipUnlessHasCallSiteInfo,
-         decorators.skipIf(archs=['arm'],oslist=["linux"]),
          decorators.skipIf(dwarf_version=['<', '4']),
          decorators.skipIf(compiler="clang", compiler_version=['<', '11.0'])]
 lldbinline.MakeInlineTest(__file__, globals(), name="UnambiguousTailCalls_V5",

lldb/test/Shell/ObjectFile/ELF/minidebuginfo-set-and-hit-breakpoint.test

@@ -1,3 +1,4 @@
+# XFAIL: target-arm && linux-gnu
 # REQUIRES: system-linux, lzma, xz
 
 # We want to keep the symbol "multiplyByThree" in the .dynamic section and not

llvm/utils/gn/secondary/clang/include/clang/Config/BUILD.gn

@@ -9,7 +9,7 @@ write_cmake_config("Config") {
   output = "$target_gen_dir/config.h"
   values = [
     "BUG_REPORT_URL=https://github.com/llvm/llvm-project/issues/",
-    "CLANG_DEFAULT_PIE_ON_LINUX=1",
+    "CLANG_DEFAULT_PIE_ON_LINUX=",
     "CLANG_DEFAULT_LINKER=",
     "CLANG_DEFAULT_STD_C=",
     "CLANG_DEFAULT_STD_CXX=",

utils/bazel/llvm-project-overlay/clang/include/clang/Config/config.h

@@ -23,7 +23,7 @@
 #define BUG_REPORT_URL "https://github.com/llvm/llvm-project/issues/"
 
 /* Default to -fPIE and -pie on Linux. */
-#define CLANG_DEFAULT_PIE_ON_LINUX 1
+#define CLANG_DEFAULT_PIE_ON_LINUX 0
 
 /* Default linker to use. */
 #define CLANG_DEFAULT_LINKER ""