Persist FPU variables across try_compile passes (#83206)

* Persist FPU variables across try_compile passes

* Fix cmakeargs in corehost and build-native projs

Author: am11

eng/common/cross/toolchain.cmake

@@ -298,6 +298,9 @@ if(TARGET_ARCH_NAME MATCHES "^(arm|armel)$")
 
   add_definitions (-DCLR_ARM_FPU_CAPABILITY=${CLR_ARM_FPU_CAPABILITY})
 
+  # persist variables across multiple try_compile passes
+  list(APPEND CMAKE_TRY_COMPILE_PLATFORM_VARIABLES CLR_ARM_FPU_TYPE CLR_ARM_FPU_CAPABILITY)
+
   if(TARGET_ARCH_NAME STREQUAL "armel")
     add_compile_options(-mfloat-abi=softfp)
   endif()

src/native/corehost/corehost.proj

@@ -78,7 +78,7 @@
       <BuildArgs Condition="'$(KeepNativeSymbols)' != 'false'">$(BuildArgs) -keepnativesymbols</BuildArgs>
       <BuildArgs Condition="'$(CrossBuild)' == 'true'">$(BuildArgs) -cross</BuildArgs>
       <BuildArgs Condition="'$(Compiler)' != ''">$(BuildArgs) $(Compiler)</BuildArgs>
-      <BuildArgs Condition="'$(CMakeArgs)' != ''">$(BuildArgs) $(CMakeArgs)</BuildArgs>
+      <BuildArgs Condition="'$(CMakeArgs)' != ''">$(BuildArgs) -cmakeargs "$(CMakeArgs)"</BuildArgs>
       <BuildArgs Condition="'$(Ninja)' == 'true'">$(BuildArgs) -ninja</BuildArgs>
       <BuildArgs>$(BuildArgs) -runtimeflavor $(RuntimeFlavor)</BuildArgs>
       <BuildArgs Condition="'$(OfficialBuildId)' != ''">$(BuildArgs) /p:OfficialBuildId="$(OfficialBuildId)"</BuildArgs>

src/native/libs/build-native.proj

@@ -29,7 +29,7 @@
       <_PortableBuildArg Condition="'$(PortableBuild)' != 'true'"> -portablebuild=false</_PortableBuildArg>
       <_CrossBuildArg Condition="'$(CrossBuild)' == 'true'"> -cross</_CrossBuildArg>
       <_KeepNativeSymbolsBuildArg Condition="'$(KeepNativeSymbols)' != 'false'"> -keepnativesymbols</_KeepNativeSymbolsBuildArg>
-      <_CMakeArgs Condition="'$(CMakeArgs)' != ''"> $(CMakeArgs)</_CMakeArgs>
+      <_CMakeArgs Condition="'$(CMakeArgs)' != ''"> -cmakeargs "$(CMakeArgs)"</_CMakeArgs>
 
       <!--
         BuildNativeCompiler is a pass-through argument, to pass an argument to build-native.sh. It is intended to be