Rust: Create 3 logical ARM builds, based on support for VFP & Thumb2

cmake/config-ix.cmake

@@ -153,7 +153,8 @@ macro(detect_target_arch)
   check_symbol_exists(__wasm32__ "" __WEBASSEMBLY32)
   check_symbol_exists(__wasm64__ "" __WEBASSEMBLY64)
   if(__ARM)
-    add_default_target_arch(arm)
+    # Android shouldn't use Thumb2 instructions but can use VFP instructions.
+    add_default_target_arch(armhf)
   elseif(__AARCH64)
     add_default_target_arch(aarch64)
   elseif(__X86_64)
@@ -220,10 +221,12 @@ elseif(NOT APPLE) # Supported archs for Apple platforms are generated later
     test_target_arch(mips "" "-mips32r2" "--target=mips-linux-gnu")
     test_target_arch(mips64 "" "-mips64r2" "--target=mips64-linux-gnu" "-mabi=n64")
   elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "arm")
-    if("${COMPILER_RT_DEFAULT_TARGET_TRIPLE}" MATCHES "eabihf")
-      test_target_arch(armhf "" "-march=armv7-a" "-mfloat-abi=hard")
+    if("${COMPILER_RT_DEFAULT_TARGET_TRIPLE}" MATCHES "armv7")
+      test_target_arch(armv7 "" "${CMAKE_C_FLAGS}")
+    elseif("${COMPILER_RT_DEFAULT_TARGET_TRIPLE}" MATCHES "eabihf")
+      test_target_arch(armhf "" "${CMAKE_C_FLAGS}")
     else()
-      test_target_arch(arm "" "-march=armv7-a" "-mfloat-abi=soft")
+      test_target_arch(arm "" "${CMAKE_C_FLAGS}")
     endif()
   elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "aarch32")
     test_target_arch(aarch32 "" "-march=armv8-a")
@@ -267,7 +270,7 @@ function(get_target_flags_for_arch arch out_var)
 endfunction()
 
 set(ARM64 aarch64)
-set(ARM32 arm armhf)
+set(ARM32 arm armhf armv7)
 set(X86 i386 i686)
 set(X86_64 x86_64)
 set(MIPS32 mips mipsel)

lib/builtins/CMakeLists.txt

@@ -227,7 +227,8 @@ else () # MSVC
   set(i686_SOURCES ${i386_SOURCES})
 endif () # if (NOT MSVC)
 
-set(arm_SOURCES
+# These are sources that should be appropriate for any ARM platform.
+set(arm_GENERIC_SOURCES
   arm/aeabi_cdcmp.S
   arm/aeabi_cdcmpeq_check_nan.c
   arm/aeabi_cfcmp.S
@@ -253,32 +254,10 @@ set(arm_SOURCES
   arm/divmodsi4.S
   arm/divsi3.S
   arm/modsi3.S
-  arm/negdf2vfp.S
-  arm/negsf2vfp.S
   arm/switch16.S
   arm/switch32.S
   arm/switch8.S
   arm/switchu8.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/sync_synchronize.S
   arm/udivmodsi4.S
   arm/udivsi3.S
@@ -304,7 +283,32 @@ set(aarch64_SOURCES
   trunctfsf2.c
   ${GENERIC_SOURCES})
 
-set(armhf_SOURCES
+# These are sources for the ARM platform that require Thumb2 instructions
+# support.
+set(arm_THUMB_SOURCES
+  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)
+
+# These are sources for the ARM platform that require VFP instructions support.
+set(arm_VFP_SOURCES
   arm/adddf3vfp.S
   arm/addsf3vfp.S
   arm/divdf3vfp.S
@@ -330,6 +334,8 @@ set(armhf_SOURCES
   arm/ltsf2vfp.S
   arm/muldf3vfp.S
   arm/mulsf3vfp.S
+  arm/negdf2vfp.S
+  arm/negsf2vfp.S
   arm/nedf2vfp.S
   arm/nesf2vfp.S
   arm/restore_vfp_d8_d15_regs.S
@@ -338,16 +344,18 @@ set(armhf_SOURCES
   arm/subsf3vfp.S
   arm/truncdfsf2vfp.S
   arm/unorddf2vfp.S
-  arm/unordsf2vfp.S
-  ${arm_SOURCES})
-set(armv7_SOURCES ${arm_SOURCES})
-set(armv7s_SOURCES ${arm_SOURCES})
+  arm/unordsf2vfp.S)
+
+set(arm_SOURCES ${arm_GENERIC_SOURCES})
+set(armhf_SOURCES ${arm_GENERIC_SOURCES} ${arm_VFP_SOURCES})
+set(armv7_SOURCES ${arm_GENERIC_SOURCES} ${arm_VFP_SOURCES} ${arm_THUMB_SOURCES})
+set(armv7s_SOURCES ${arm_GENERIC_SOURCES} ${arm_VFP_SOURCES} ${arm_THUMB_SOURCES})
 set(arm64_SOURCES ${aarch64_SOURCES})
 
 # macho_embedded archs
 set(armv6m_SOURCES ${GENERIC_SOURCES})
-set(armv7m_SOURCES ${arm_SOURCES})
-set(armv7em_SOURCES ${arm_SOURCES})
+set(armv7m_SOURCES ${arm_GENERIC_SOURCES} ${arm_THUMB_SOURCES})
+set(armv7em_SOURCES ${arm_GENERIC_SOURCES} ${arm_THUMB_SOURCES})
 
 set(mips_SOURCES ${GENERIC_SOURCES})
 set(mipsel_SOURCES ${mips_SOURCES})