[gn] Support for building compiler-rt builtins

[phosek]

Summary

This is support for building compiler-rt builtins, The library build
should be complete for a subset of supported platforms, but not all
CMake options have been replicated in GN.

We always use the just built compiler to build all the runtimes, which
is equivalent to the CMake runtimes build. This simplifies the build
configuration because we don't need to support arbitrary host compiler
and can always assume the latest Clang. With GN's toolchain support,
this is significantly more efficient than the CMake runtimes build.

[thakis]

lgtm except for minor comments:

llvm/utils/gn/secondary/compiler-rt/lib/BUILD.gn

4

llvm/utils/gn/gn.py help label: "Stylistically, we prefer to use absolute paths for all non-file-local references"

llvm/utils/gn/secondary/compiler-rt/lib/builtins/BUILD.gn

31

Edit llvm/utils/gn/build/sync_source_lists_from_cmake.py and modify gn_cpp_re and cmake_cpp_re to contain |c after cpp and make sure the script is still happy. You probably have to move a few closing parens in compiler-rt/lib/builtins/CMakeLists.txt to the next line (which is by far the more common style in LLVM's cmake, so this will make the cmake build more consistent too).

Hm, looking at that file, we might want to add |S there too.

[thakis]

Thanks! lgtm with the comment for the one one-line sources line as discussed.

compiler-rt/lib/builtins/CMakeLists.txt

154

(the more common style is to indent the ) by two. unless you're being consistent with other places in this file, consider indenting the closing parens)

llvm/utils/gn/secondary/compiler-rt/lib/builtins/BUILD.gn

365

ppc64 too, or are these 32-bit?

[phosek]

compiler-rt/lib/builtins/CMakeLists.txt

154

Other sets in this file already used this style so I was trying to be consistent with those. Do you want me to reformat all of them?

[thakis]

compiler-rt/lib/builtins/CMakeLists.txt

154

No, it's fine then.

compiler-rt/lib/builtins/CMakeLists.txt

set(GENERIC_SOURCES
   udivdi3.c
   udivmoddi4.c
   udivmodsi4.c
   udivmodti4.c
   udivsi3.c
   udivti3.c
   umoddi3.c
   umodsi3.c
-  umodti3.c)
+  umodti3.c
+)
 
 set(GENERIC_TF_SOURCES
   comparetf2.c
   extenddftf2.c
   extendsftf2.c
   fixtfdi.c
   fixtfsi.c
   fixtfti.c
   fixunstfdi.c
   fixunstfsi.c
   fixunstfti.c
   floatditf.c
   floatsitf.c
   floattitf.c
   floatunditf.c
   floatunsitf.c
   floatuntitf.c
   multc3.c
   trunctfdf2.c
-  trunctfsf2.c)
+  trunctfsf2.c
+)
 
 option(COMPILER_RT_EXCLUDE_ATOMIC_BUILTIN
   "Skip the atomic builtin (these should normally be provided by a shared library)"
   On)
 
 if(NOT FUCHSIA AND NOT COMPILER_RT_BAREMETAL_BUILD)
   set(GENERIC_SOURCES
     ${GENERIC_SOURCES}
-    emutls.c 
+    emutls.c
     enable_execute_stack.c
-    eprintf.c)
+    eprintf.c
+  )
 endif()
 
 if(COMPILER_RT_HAS_ATOMIC_KEYWORD AND NOT COMPILER_RT_EXCLUDE_ATOMIC_BUILTIN)
   set(GENERIC_SOURCES
     ${GENERIC_SOURCES}
-    atomic.c)
+    atomic.c
+  )
 endif()
 
 if(APPLE)
   set(GENERIC_SOURCES
     ${GENERIC_SOURCES}
     atomic_flag_clear.c
     atomic_flag_clear_explicit.c
     atomic_flag_test_and_set.c
     atomic_flag_test_and_set_explicit.c
     atomic_signal_fence.c
-    atomic_thread_fence.c)
+    atomic_thread_fence.c
+  )
 endif()
 
 if (HAVE_UNWIND_H)
   set(GENERIC_SOURCES
-      ${GENERIC_SOURCES}
-      gcc_personality_v0.c)
+    gcc_personality_v0.c
+  )
 endif ()
 
 if (NOT FUCHSIA)
   set(GENERIC_SOURCES
     ${GENERIC_SOURCES}
-    clear_cache.c)
+    clear_cache.c
+  )
 endif()
 
 # These sources work on all x86 variants, but only x86 variants.
 set(x86_ARCH_SOURCES
   cpu_model.c
   divxc3.c
   fixxfdi.c
   fixxfti.c
   fixunsxfdi.c
   fixunsxfsi.c
   fixunsxfti.c
   floatdixf.c
   floattixf.c
   floatundixf.c
   floatuntixf.c
   mulxc3.c
   powixf2.c
 )
 
 if (NOT MSVC)
   set(x86_64_SOURCES
-      x86_64/floatdidf.c
-      x86_64/floatdisf.c
-      x86_64/floatdixf.c
-      x86_64/floatundidf.S
-      x86_64/floatundisf.S
-      x86_64/floatundixf.S)
+    x86_64/floatundixf.S
+  )
   filter_builtin_sources(x86_64_SOURCES EXCLUDE x86_64_SOURCES "${x86_64_SOURCES};${GENERIC_SOURCES}")
   set(x86_64h_SOURCES ${x86_64_SOURCES})
 
   if (WIN32)
     set(x86_64_SOURCES
-        ${x86_64_SOURCES}
-        x86_64/chkstk.S
-        x86_64/chkstk2.S)
+      x86_64/chkstk2.S
+    )
   endif()
 
   set(i386_SOURCES
-      i386/ashldi3.S
-      i386/ashrdi3.S
-      i386/divdi3.S
-      i386/floatdidf.S
-      i386/floatdisf.S
-      i386/floatdixf.S
-      i386/floatundidf.S
-      i386/floatundisf.S
-      i386/floatundixf.S
-      i386/lshrdi3.S
-      i386/moddi3.S
-      i386/muldi3.S
-      i386/udivdi3.S
-      i386/umoddi3.S)
+    i386/umoddi3.S
+  )
   filter_builtin_sources(i386_SOURCES EXCLUDE i386_SOURCES "${i386_SOURCES};${GENERIC_SOURCES}")
 
   if (WIN32)
     set(i386_SOURCES
-        ${i386_SOURCES}
-        i386/chkstk.S
-        i386/chkstk2.S)
+      i386/chkstk2.S
+    )
   endif()
 else () # MSVC
   # Use C versions of functions when building on MSVC
   # MSVC's assembler takes Intel syntax, not AT&T syntax.
   # Also use only MSVC compilable builtin implementations.
   set(x86_64_SOURCES
-      x86_64/floatdidf.c
-      x86_64/floatdisf.c
-      x86_64/floatdixf.c
-      ${GENERIC_SOURCES})
+    ${GENERIC_SOURCES}
+  )
   set(x86_64h_SOURCES ${x86_64_SOURCES})
   set(i386_SOURCES ${GENERIC_SOURCES})
 endif () # if (NOT MSVC)
 
 set(x86_64h_SOURCES ${x86_64h_SOURCES} ${x86_ARCH_SOURCES})
 set(x86_64_SOURCES ${x86_64_SOURCES} ${x86_ARCH_SOURCES})
 set(i386_SOURCES ${i386_SOURCES} ${x86_ARCH_SOURCES})
 set(i686_SOURCES ${i686_SOURCES} ${x86_ARCH_SOURCES})
set(arm_SOURCES
   arm/sync_fetch_and_umax_4.S
   arm/sync_fetch_and_umax_8.S
   arm/sync_fetch_and_umin_4.S
   arm/sync_fetch_and_umin_8.S
   arm/sync_fetch_and_xor_4.S
   arm/sync_fetch_and_xor_8.S
   arm/udivmodsi4.S
   arm/udivsi3.S
-  arm/umodsi3.S)
+  arm/umodsi3.S
+)
 filter_builtin_sources(arm_SOURCES EXCLUDE arm_SOURCES "${arm_SOURCES};${GENERIC_SOURCES}")
 
 set(thumb1_SOURCES
   arm/divsi3.S
   arm/udivsi3.S
   arm/comparesf2.S
   arm/addsf3.S
-  ${GENERIC_SOURCES})
+  ${GENERIC_SOURCES}
+)
 
 set(arm_EABI_SOURCES
   arm/aeabi_cdcmp.S
   arm/aeabi_cdcmpeq_check_nan.c
   arm/aeabi_cfcmp.S
   arm/aeabi_cfcmpeq_check_nan.c
   arm/aeabi_dcmp.S
   arm/aeabi_div0.c
   arm/aeabi_drsub.c
   arm/aeabi_fcmp.S
   arm/aeabi_frsub.c
   arm/aeabi_idivmod.S
   arm/aeabi_ldivmod.S
   arm/aeabi_memcmp.S
   arm/aeabi_memcpy.S
   arm/aeabi_memmove.S
   arm/aeabi_memset.S
   arm/aeabi_uidivmod.S
-  arm/aeabi_uldivmod.S)
+  arm/aeabi_uldivmod.S
+)
 
 set(arm_Thumb1_JT_SOURCES
   arm/switch16.S
   arm/switch32.S
   arm/switch8.S
-  arm/switchu8.S)
+  arm/switchu8.S
+)
 set(arm_Thumb1_SjLj_EH_SOURCES
   arm/restore_vfp_d8_d15_regs.S
-  arm/save_vfp_d8_d15_regs.S)
+  arm/save_vfp_d8_d15_regs.S
+)
 set(arm_Thumb1_VFPv2_SOURCES
   arm/adddf3vfp.S
   arm/addsf3vfp.S
   arm/divdf3vfp.S
   arm/divsf3vfp.S
   arm/eqdf2vfp.S
   arm/eqsf2vfp.S
   arm/extendsfdf2vfp.S
set(arm_Thumb1_VFPv2_SOURCES
   arm/nedf2vfp.S
   arm/negdf2vfp.S
   arm/negsf2vfp.S
   arm/nesf2vfp.S
   arm/subdf3vfp.S
   arm/subsf3vfp.S
   arm/truncdfsf2vfp.S
   arm/unorddf2vfp.S
-  arm/unordsf2vfp.S)
+  arm/unordsf2vfp.S
+)
 set(arm_Thumb1_icache_SOURCES
-  arm/sync_synchronize.S)
+  arm/sync_synchronize.S
+)
 set(arm_Thumb1_SOURCES
   ${arm_Thumb1_JT_SOURCES}
   ${arm_Thumb1_SjLj_EH_SOURCES}
   ${arm_Thumb1_VFPv2_SOURCES}
-  ${arm_Thumb1_icache_SOURCES})
+  ${arm_Thumb1_icache_SOURCES}
+)
 
 if(MINGW)
   set(arm_SOURCES
-      arm/aeabi_idivmod.S
-      arm/aeabi_ldivmod.S
-      arm/aeabi_uidivmod.S
-      arm/aeabi_uldivmod.S
-      arm/chkstk.S
-      divmoddi4.c
-      divmodsi4.c
-      divdi3.c
-      divsi3.c
-      fixdfdi.c
-      fixsfdi.c
-      fixunsdfdi.c
-      fixunssfdi.c
-      floatdidf.c
-      floatdisf.c
-      floatundidf.c
-      floatundisf.c
-      mingw_fixfloat.c
-      moddi3.c
-      udivmoddi4.c
-      udivmodsi4.c
-      udivsi3.c
-      umoddi3.c
-      emutls.c)
+    emutls.c
+  )
   filter_builtin_sources(arm_SOURCES EXCLUDE arm_SOURCES "${arm_SOURCES};${GENERIC_SOURCES}")
 elseif(NOT WIN32)
   # TODO the EABI sources should only be added to EABI targets
   set(arm_SOURCES
     ${arm_SOURCES}
     ${arm_EABI_SOURCES}
-    ${arm_Thumb1_SOURCES})
+    ${arm_Thumb1_SOURCES}
+  )
 
   set(thumb1_SOURCES
     ${thumb1_SOURCES}
-    ${arm_EABI_SOURCES})
+    ${arm_EABI_SOURCES}
+  )
 endif()
 
 set(aarch64_SOURCES
   ${GENERIC_TF_SOURCES}
-  ${GENERIC_SOURCES})
+  ${GENERIC_SOURCES}
+)
 
 if (MINGW)
   set(aarch64_SOURCES
-      ${aarch64_SOURCES}
-      aarch64/chkstk.S)
+    aarch64/chkstk.S
+  )
 endif()
 
 set(armhf_SOURCES ${arm_SOURCES})
 set(armv7_SOURCES ${arm_SOURCES})
 set(armv7s_SOURCES ${arm_SOURCES})
 set(armv7k_SOURCES ${arm_SOURCES})
 set(arm64_SOURCES ${aarch64_SOURCES})
 
set(hexagon_SOURCES
   hexagon/modsi3.S
   hexagon/sfdiv_opt.S
   hexagon/sfsqrt_opt.S
   hexagon/udivdi3.S
   hexagon/udivmoddi4.S
   hexagon/udivmodsi4.S
   hexagon/udivsi3.S
   hexagon/umoddi3.S
-  hexagon/umodsi3.S)
+  hexagon/umodsi3.S
+)
 
 
 set(mips_SOURCES ${GENERIC_SOURCES})
 set(mipsel_SOURCES ${mips_SOURCES})
 set(mips64_SOURCES ${GENERIC_TF_SOURCES}
                    ${mips_SOURCES})
 set(mips64el_SOURCES ${GENERIC_TF_SOURCES}
                      ${mips_SOURCES})
 
 set(powerpc64_SOURCES
   ppc/divtc3.c
   ppc/fixtfdi.c
   ppc/fixunstfti.c
   ppc/fixunstfdi.c
   ppc/floattitf.c
   ppc/floatditf.c
   ppc/floatunditf.c
   ppc/gcc_qadd.c
   ppc/gcc_qdiv.c
   ppc/gcc_qmul.c
   ppc/gcc_qsub.c
   ppc/multc3.c
-  ${GENERIC_SOURCES})
+  ${GENERIC_SOURCES}
+)
 set(powerpc64le_SOURCES ${powerpc64_SOURCES})
 
 set(riscv_SOURCES ${GENERIC_SOURCES} ${GENERIC_TF_SOURCES})
 set(riscv32_SOURCES
   riscv/mulsi3.S
-  ${riscv_SOURCES})
+  ${riscv_SOURCES}
+)
 set(riscv64_SOURCES ${riscv_SOURCES})
 
 set(wasm32_SOURCES
   ${GENERIC_TF_SOURCES}
-  ${GENERIC_SOURCES})
+  ${GENERIC_SOURCES}
+)
 set(wasm64_SOURCES
   ${GENERIC_TF_SOURCES}
-  ${GENERIC_SOURCES})
+  ${GENERIC_SOURCES}
+)
 
 add_custom_target(builtins)
 set_target_properties(builtins PROPERTIES FOLDER "Compiler-RT Misc")
 
 if (APPLE)
   add_subdirectory(Darwin-excludes)
   add_subdirectory(macho_embedded)
   darwin_add_builtin_libraries(${BUILTIN_SUPPORTED_OS})

llvm/utils/gn/build/sync_source_lists_from_cmake.py

 
 
 def sync_source_lists():
     # Use shell=True on Windows in case git is a bat file.
     gn_files = subprocess.check_output(['git', 'ls-files', '*BUILD.gn'],
                                        shell=os.name == 'nt').splitlines()
 
     # Matches e.g. |   "foo.cpp",|, captures |foo| in group 1.
-    gn_cpp_re = re.compile(r'^\s*"([^"]+\.(?:cpp|h))",$', re.MULTILINE)
+    gn_cpp_re = re.compile(r'^\s*"([^"]+\.(?:cpp|c|h|S))",$', re.MULTILINE)
     # Matches e.g. |   foo.cpp|, captures |foo| in group 1.
-    cmake_cpp_re = re.compile(r'^\s*([A-Za-z_0-9/-]+\.(?:cpp|h))$',
+    cmake_cpp_re = re.compile(r'^\s*([A-Za-z_0-9/-]+\.(?:cpp|c|h|S))$',
                               re.MULTILINE)
 
     for gn_file in gn_files:
         # The CMakeLists.txt for llvm/utils/gn/secondary/foo/BUILD.gn is
         # directly at foo/CMakeLists.txt.
         strip_prefix = 'llvm/utils/gn/secondary/'
         if not gn_file.startswith(strip_prefix):
             continue

llvm/utils/gn/secondary/BUILD.gn

 import("//clang/lib/ARCMigrate/enable.gni")
 import("//clang/lib/StaticAnalyzer/Frontend/enable.gni")
 import("//llvm/utils/gn/build/toolchain/compiler.gni")
 
 group("default") {
   deps = [
     "//clang-tools-extra/test",
     "//clang/test",
     "//lld/test",
     "//llvm/test",
   ]
+  if (current_os == "linux") {
+    deps += [ "//compiler-rt" ]
+  }
   if (current_os == "linux" || current_os == "android") {
     deps += [ "//compiler-rt/test/hwasan" ]
   }
 
   testonly = true
 }
 
 # Symlink handling.

llvm/utils/gn/secondary/compiler-rt/BUILD.gn

+group("compiler-rt") {
+  deps = [
+    "//compiler-rt/lib(//llvm/utils/gn/build/toolchain:stage2_unix)",
+  ]
+}

llvm/utils/gn/secondary/compiler-rt/lib/BUILD.gn

+group("lib") {
+  deps = [
+    "//compiler-rt/lib/builtins",
+  ]
+}

llvm/utils/gn/secondary/compiler-rt/lib/builtins/BUILD.gn

+import("//compiler-rt/target.gni")
+import("//llvm/utils/gn/build/buildflags.gni")
+
+declare_args() {
+  # Skip the atomic builtin (these should normally be provided by a shared library)
+  compiler_rt_exclude_atomic_builtin = true
+
+  # Compile builtins for baremetal.
+  compiler_rt_baremetal_build = false
+}
+
+static_library("builtins") {
+  output_dir = crt_current_out_dir
+  output_name = "clang_rt.builtins-$crt_current_target"
+  complete_static_lib = true
+  cflags = [
+    "-fPIC",
+    "-fno-builtin",
+  ]
+  if (target_os != "android") {
+    cflags += [ "-fvisibility=hidden" ]
+  }
+  if (!is_debug) {
+    cflags += [ "-fomit-frame-pointer" ]
+  }
+  cflags_c = [ "-std=c11" ]
+  configs -= [ "//llvm/utils/gn/build:thin_archive" ]
+
+  sources = [
+    "absvdi2.c",
+    "absvsi2.c",
+    "absvti2.c",
+    "adddf3.c",
+    "addsf3.c",
+    "addtf3.c",
+    "addvdi3.c",
+    "addvsi3.c",
+    "addvti3.c",
+    "apple_versioning.c",
+    "ashldi3.c",
+    "ashlti3.c",
+    "ashrdi3.c",
+    "ashrti3.c",
+    "bswapdi2.c",
+    "bswapsi2.c",
+    "clzdi2.c",
+    "clzsi2.c",
+    "clzti2.c",
+    "cmpdi2.c",
+    "cmpti2.c",
+    "comparedf2.c",
+    "comparesf2.c",
+    "ctzdi2.c",
+    "ctzsi2.c",
+    "ctzti2.c",
+    "divdc3.c",
+    "divdf3.c",
+    "divdi3.c",
+    "divmoddi4.c",
+    "divmodsi4.c",
+    "divsc3.c",
+    "divsf3.c",
+    "divsi3.c",
+    "divtc3.c",
+    "divti3.c",
+    "divtf3.c",
+    "extendsfdf2.c",
+    "extendhfsf2.c",
+    "ffsdi2.c",
+    "ffssi2.c",
+    "ffsti2.c",
+    "fixdfdi.c",
+    "fixdfsi.c",
+    "fixdfti.c",
+    "fixsfdi.c",
+    "fixsfsi.c",
+    "fixsfti.c",
+    "fixunsdfdi.c",
+    "fixunsdfsi.c",
+    "fixunsdfti.c",
+    "fixunssfdi.c",
+    "fixunssfsi.c",
+    "fixunssfti.c",
+    "floatdidf.c",
+    "floatdisf.c",
+    "floatsidf.c",
+    "floatsisf.c",
+    "floattidf.c",
+    "floattisf.c",
+    "floatundidf.c",
+    "floatundisf.c",
+    "floatunsidf.c",
+    "floatunsisf.c",
+    "floatuntidf.c",
+    "floatuntisf.c",
+    "gcc_personality_v0.c",
+    "int_util.c",
+    "lshrdi3.c",
+    "lshrti3.c",
+    "moddi3.c",
+    "modsi3.c",
+    "modti3.c",
+    "muldc3.c",
+    "muldf3.c",
+    "muldi3.c",
+    "mulodi4.c",
+    "mulosi4.c",
+    "muloti4.c",
+    "mulsc3.c",
+    "mulsf3.c",
+    "multi3.c",
+    "multf3.c",
+    "mulvdi3.c",
+    "mulvsi3.c",
+    "mulvti3.c",
+    "negdf2.c",
+    "negdi2.c",
+    "negsf2.c",
+    "negti2.c",
+    "negvdi2.c",
+    "negvsi2.c",
+    "negvti2.c",
+    "os_version_check.c",
+    "paritydi2.c",
+    "paritysi2.c",
+    "parityti2.c",
+    "popcountdi2.c",
+    "popcountsi2.c",
+    "popcountti2.c",
+    "powidf2.c",
+    "powisf2.c",
+    "powitf2.c",
+    "subdf3.c",
+    "subsf3.c",
+    "subvdi3.c",
+    "subvsi3.c",
+    "subvti3.c",
+    "subtf3.c",
+    "trampoline_setup.c",
+    "truncdfhf2.c",
+    "truncdfsf2.c",
+    "truncsfhf2.c",
+    "ucmpdi2.c",
+    "ucmpti2.c",
+    "udivdi3.c",
+    "udivmoddi4.c",
+    "udivmodsi4.c",
+    "udivmodti4.c",
+    "udivsi3.c",
+    "udivti3.c",
+    "umoddi3.c",
+    "umodsi3.c",
+    "umodti3.c",
+  ]
+
+  if (target_os != "fuchsia") {
+    sources += [
+      "emutls.c ",
+      "enable_execute_stack.c",
+      "eprintf.c",
+    ]
+  }
+
+  if (target_os != "fuchsia" && !compiler_rt_baremetal_build) {
+    sources += [
+      "clear_cache.c",
+    ]
+  }
+
+  if (target_os == "mac") {
+    sources += [
+      "atomic_flag_clear.c",
+      "atomic_flag_clear_explicit.c",
+      "atomic_flag_test_and_set.c",
+      "atomic_flag_test_and_set_explicit.c",
+      "atomic_signal_fence.c",
+      "atomic_thread_fence.c",
+    ]
+  }
+
+  if (target_cpu == "x86" || target_cpu == "x64") {
+    sources += [
+      "cpu_model.c",
+      "divxc3.c",
+      "fixxfdi.c",
+      "fixxfti.c",
+      "fixunsxfdi.c",
+      "fixunsxfsi.c",
+      "fixunsxfti.c",
+      "floatdixf.c",
+      "floattixf.c",
+      "floatundixf.c",
+      "floatuntixf.c",
+      "mulxc3.c",
+      "powixf2.c",
+    ]
+  }
+  if (target_os == "x86") {
+    sources += [
+      "i386/ashldi3.S",
+      "i386/ashrdi3.S",
+      "i386/divdi3.S",
+      "i386/floatdidf.S",
+      "i386/floatdisf.S",
+      "i386/floatdixf.S",
+      "i386/floatundidf.S",
+      "i386/floatundisf.S",
+      "i386/floatundixf.S",
+      "i386/lshrdi3.S",
+      "i386/moddi3.S",
+      "i386/muldi3.S",
+      "i386/udivdi3.S",
+      "i386/umoddi3.S",
+    ]
+    if (target_os == "win") {
+      sources += [
+        "i386/chkstk.S",
+        "i386/chkstk2.S",
+      ]
+    }
+  } else if (target_cpu == "x64") {
+    sources += [
+      "x86_64/floatdidf.c",
+      "x86_64/floatdisf.c",
+      "x86_64/floatdixf.c",
+      "x86_64/floatundidf.S",
+      "x86_64/floatundisf.S",
+      "x86_64/floatundixf.S",
+    } else {
+    if (target_os == "win") {
+      sources += [
+        "x86_64/chkstk.S",
+        "x86_64/chkstk2.S",
+      ]
+    }
+  }
+
+  if (target_cpu == "arm") {
+    sources += [
+      "arm/bswapdi2.S",
+      "arm/bswapsi2.S",
+      "arm/clzdi2.S",
+      "arm/clzsi2.S",
+      "arm/comparesf2.S",
+      "arm/divmodsi4.S",
+      "arm/divsi3.S",
+      "arm/modsi3.S",
+      "arm/sync_fetch_and_add_4.S",
+      "arm/sync_fetch_and_add_8.S",
+      "arm/sync_fetch_and_and_4.S",
+      "arm/sync_fetch_and_and_8.S",
+      "arm/sync_fetch_and_max_4.S",
+      "arm/sync_fetch_and_max_8.S",
+      "arm/sync_fetch_and_min_4.S",
+      "arm/sync_fetch_and_min_8.S",
+      "arm/sync_fetch_and_nand_4.S",
+      "arm/sync_fetch_and_nand_8.S",
+      "arm/sync_fetch_and_or_4.S",
+      "arm/sync_fetch_and_or_8.S",
+      "arm/sync_fetch_and_sub_4.S",
+      "arm/sync_fetch_and_sub_8.S",
+      "arm/sync_fetch_and_umax_4.S",
+      "arm/sync_fetch_and_umax_8.S",
+      "arm/sync_fetch_and_umin_4.S",
+      "arm/sync_fetch_and_umin_8.S",
+      "arm/sync_fetch_and_xor_4.S",
+      "arm/sync_fetch_and_xor_8.S",
+      "arm/udivmodsi4.S",
+      "arm/udivsi3.S",
+      "arm/umodsi3.S",
+    ]
+    if (target_os == "mingw") {
+      sources += [
+        "arm/aeabi_idivmod.S",
+        "arm/aeabi_ldivmod.S",
+        "arm/aeabi_uidivmod.S",
+        "arm/aeabi_uldivmod.S",
+        "arm/chkstk.S",
+        "divmoddi4.c",
+        "divmodsi4.c",
+        "divdi3.c",
+        "divsi3.c",
+        "fixdfdi.c",
+        "fixsfdi.c",
+        "fixunsdfdi.c",
+        "fixunssfdi.c",
+        "floatdidf.c",
+        "floatdisf.c",
+        "floatundidf.c",
+        "floatundisf.c",
+        "mingw_fixfloat.c",
+        "moddi3.c",
+        "udivmoddi4.c",
+        "udivmodsi4.c",
+        "udivsi3.c",
+        "umoddi3.c",
+        "emutls.c",
+      ]
+    }
+  }
+
+  if (target_cpu == "arm64") {
+    sources += [
+      "comparetf2.c",
+      "extenddftf2.c",
+      "extendsftf2.c",
+      "fixtfdi.c",
+      "fixtfsi.c",
+      "fixtfti.c",
+      "fixunstfdi.c",
+      "fixunstfsi.c",
+      "fixunstfti.c",
+      "floatditf.c",
+      "floatsitf.c",
+      "floattitf.c",
+      "floatunditf.c",
+      "floatunsitf.c",
+      "floatuntitf.c",
+      "multc3.c",
+      "trunctfdf2.c",
+      "trunctfsf2.c",
+    ]
+    if (target_os == "mingw") {
+      sources += [
+        "aarch64/chkstk.S",
+      ]
+    }
+  }
+
+  if (target_cpu == "hexagon") {
+    sources += [
+      "hexagon/common_entry_exit_abi1.S",
+      "hexagon/common_entry_exit_abi2.S",
+      "hexagon/common_entry_exit_legacy.S",
+      "hexagon/dfaddsub.S",
+      "hexagon/dfdiv.S",
+      "hexagon/dffma.S",
+      "hexagon/dfminmax.S",
+      "hexagon/dfmul.S",
+      "hexagon/dfsqrt.S",
+      "hexagon/divdi3.S",
+      "hexagon/divsi3.S",
+      "hexagon/fabs_opt.S",
+      "hexagon/fastmath2_dlib_asm.S",
+      "hexagon/fastmath2_ldlib_asm.S",
+      "hexagon/fastmath_dlib_asm.S",
+      "hexagon/fma_opt.S",
+      "hexagon/fmax_opt.S",
+      "hexagon/fmin_opt.S",
+      "hexagon/memcpy_forward_vp4cp4n2.S",
+      "hexagon/memcpy_likely_aligned.S",
+      "hexagon/moddi3.S",
+      "hexagon/modsi3.S",
+      "hexagon/sfdiv_opt.S",
+      "hexagon/sfsqrt_opt.S",
+      "hexagon/udivdi3.S",
+      "hexagon/udivmoddi4.S",
+      "hexagon/udivmodsi4.S",
+      "hexagon/udivsi3.S",
+      "hexagon/umoddi3.S",
+      "hexagon/umodsi3.S",
+    ]
+  }
+
+  if (target_cpu == "ppc") {
+    sources += [
+      "ppc/divtc3.c",
+      "ppc/fixtfdi.c",
+      "ppc/fixunstfti.c",
+      "ppc/fixunstfdi.c",
+      "ppc/floattitf.c",
+      "ppc/floatditf.c",
+      "ppc/floatunditf.c",
+      "ppc/gcc_qadd.c",
+      "ppc/gcc_qdiv.c",
+      "ppc/gcc_qmul.c",
+      "ppc/gcc_qsub.c",
+      "ppc/multc3.c",
+    ]
+  }
+
+  if (target_cpy == "riscv") {
+    sources += [
+      "riscv/mulsi3.S",
+    ]
+  }
+
+  if (!compiler_rt_exclude_atomic_builtin) {
+    sources += [
+      "atomic.c",
+    ]
+  }
+}
+
+# Currently unused but necessary to make the sync_source_lists_from_cmake.py happy.
+source_set("_unused") {
+  sources += [
+    # Thumb1
+    "arm/divsi3.S",
+    "arm/udivsi3.S",
+    "arm/comparesf2.S",
+    "arm/addsf3.S",
+
+    # EABI
+    "arm/aeabi_cdcmp.S",
+    "arm/aeabi_cdcmpeq_check_nan.c",
+    "arm/aeabi_cfcmp.S",
+    "arm/aeabi_cfcmpeq_check_nan.c",
+    "arm/aeabi_dcmp.S",
+    "arm/aeabi_div0.c",
+    "arm/aeabi_drsub.c",
+    "arm/aeabi_fcmp.S",
+    "arm/aeabi_frsub.c",
+    "arm/aeabi_idivmod.S",
+    "arm/aeabi_ldivmod.S",
+    "arm/aeabi_memcmp.S",
+    "arm/aeabi_memcpy.S",
+    "arm/aeabi_memmove.S",
+    "arm/aeabi_memset.S",
+    "arm/aeabi_uidivmod.S",
+    "arm/aeabi_uldivmod.S",
+  
+    # Thumb1 JT
+    "arm/switch16.S",
+    "arm/switch32.S",
+    "arm/switch8.S",
+    "arm/switchu8.S",
+  
+    # Thumb1 SjLj
+    "arm/restore_vfp_d8_d15_regs.S",
+    "arm/save_vfp_d8_d15_regs.S",
+  
+    # Thumb1 VFPv2
+    "arm/adddf3vfp.S",
+    "arm/addsf3vfp.S",
+    "arm/divdf3vfp.S",
+    "arm/divsf3vfp.S",
+    "arm/eqdf2vfp.S",
+    "arm/eqsf2vfp.S",
+    "arm/extendsfdf2vfp.S",
+    "arm/fixdfsivfp.S",
+    "arm/fixsfsivfp.S",
+    "arm/fixunsdfsivfp.S",
+    "arm/fixunssfsivfp.S",
+    "arm/floatsidfvfp.S",
+    "arm/floatsisfvfp.S",
+    "arm/floatunssidfvfp.S",
+    "arm/floatunssisfvfp.S",
+    "arm/gedf2vfp.S",
+    "arm/gesf2vfp.S",
+    "arm/gtdf2vfp.S",
+    "arm/gtsf2vfp.S",
+    "arm/ledf2vfp.S",
+    "arm/lesf2vfp.S",
+    "arm/ltdf2vfp.S",
+    "arm/ltsf2vfp.S",
+    "arm/muldf3vfp.S",
+    "arm/mulsf3vfp.S",
+    "arm/nedf2vfp.S",
+    "arm/negdf2vfp.S",
+    "arm/negsf2vfp.S",
+    "arm/nesf2vfp.S",
+    "arm/subdf3vfp.S",
+    "arm/subsf3vfp.S",
+    "arm/truncdfsf2vfp.S",
+    "arm/unorddf2vfp.S",
+    "arm/unordsf2vfp.S",
+  
+    # Thumb1 icache
+    "arm/sync_synchronize.S",
+  ]
+}