Tweaks with general improvements and extra debug information

- replace gcc with g++ when compiling C++
- add extra flags when building in debug to output more data and symbols 
- add several flags to improve compilation/link (because we are dealing with "bare metal" systems)
- add extra specs that pair with newlib nano targeting "bare metal" systems
- add debug flavor configurations for final linked file
(tested with GCC 5-2015-q4-major)

Author: josesimoes

tools/Targets/Microsoft.Spot.system.gcc.targets

@@ -15,8 +15,8 @@
 
     <CC>"$(GNU_TOOLS_BIN)\$(GNU_TARGET)-gcc.exe"</CC>
     <TCC>"$(GNU_TOOLS_BIN)\$(GNU_TARGET)-gcc.exe"</TCC>
-    <CPP>"$(GNU_TOOLS_BIN)\$(GNU_TARGET)-gcc.exe"</CPP>
-    <TCPP>"$(GNU_TOOLS_BIN)\$(GNU_TARGET)-gcc.exe"</TCPP>
+    <CPP>"$(GNU_TOOLS_BIN)\$(GNU_TARGET)-g++.exe"</CPP>
+    <TCPP>"$(GNU_TOOLS_BIN)\$(GNU_TARGET)-g++.exe"</TCPP>
     <AS>"$(GNU_TOOLS_BIN)\$(GNU_TARGET)-as.exe"</AS>
     <LINK>"$(GNU_TOOLS_BIN)\$(GNU_TARGET)-g++.exe"</LINK>
     <AR>"$(GNU_TOOLS_BIN)\$(GNU_TARGET)-ar.exe"</AR>
@@ -46,13 +46,19 @@
 
     <POS_DEPENDENT></POS_DEPENDENT>
     <POS_INDEPENDENT>-fpic</POS_INDEPENDENT>
-    <CC_CPP_COMMON_FLAGS>$(CC_CPP_COMMON_FLAGS) -mabi=aapcs -ffunction-sections -fomit-frame-pointer -mlong-calls -fdollars-in-identifiers -fshort-wchar -fno-exceptions -funsigned-char -mstructure-size-boundary=8</CC_CPP_COMMON_FLAGS>
+    <CC_CPP_COMMON_FLAGS>$(CC_CPP_COMMON_FLAGS) -mabi=aapcs -ffunction-sections -fdata-sections -fomit-frame-pointer -mlong-calls -fdollars-in-identifiers -fshort-wchar -fno-exceptions -funsigned-char -mstructure-size-boundary=8</CC_CPP_COMMON_FLAGS>
     <CC_CPP_TARGETTYPE_FLAGS Condition="'$(FLAVOR)'=='RTM'"          >$(CC_CPP_TARGETTYPE_FLAGS) -O3</CC_CPP_TARGETTYPE_FLAGS>
-    <CC_CPP_TARGETTYPE_FLAGS Condition="'$(FLAVOR)'=='Debug'"        >$(CC_CPP_TARGETTYPE_FLAGS) -O0 -femit-class-debug-always</CC_CPP_TARGETTYPE_FLAGS>
+    <CC_CPP_TARGETTYPE_FLAGS Condition="'$(FLAVOR)'=='Debug'"        >$(CC_CPP_TARGETTYPE_FLAGS) -Og -femit-class-debug-always -g3 -ggdb</CC_CPP_TARGETTYPE_FLAGS>
     <CC_CPP_TARGETTYPE_FLAGS Condition="'$(FLAVOR)'=='Instrumented'" >$(CC_CPP_TARGETTYPE_FLAGS) -O0</CC_CPP_TARGETTYPE_FLAGS>
     <CC_CPP_TARGETTYPE_FLAGS Condition="'$(FLAVOR)'=='Release'"      >$(CC_CPP_TARGETTYPE_FLAGS) -Os</CC_CPP_TARGETTYPE_FLAGS>
 
     <CC_FLAGS>$(CC_FLAGS)-xc</CC_FLAGS>
+    
+    <ARCH_TARGETTYPE_FLAGS Condition="'$(FLAVOR)'=='RTM'"          >-O3</ARCH_TARGETTYPE_FLAGS>
+    <ARCH_TARGETTYPE_FLAGS Condition="'$(FLAVOR)'=='Debug'"        >-Og -femit-class-debug-always -g3 -ggdb</ARCH_TARGETTYPE_FLAGS>
+    <ARCH_TARGETTYPE_FLAGS Condition="'$(FLAVOR)'=='Instrumented'" >-O0</ARCH_TARGETTYPE_FLAGS>
+    <ARCH_TARGETTYPE_FLAGS Condition="'$(FLAVOR)'=='Release'"      >-Os</ARCH_TARGETTYPE_FLAGS>
+
     <!--
     Disabling all warnings for GCC - it's just too noisy to be useful.
     Even worse is that some of the most useless can't even be disabled.
@@ -61,10 +67,10 @@
     NETMF already builds under two other compilers, so warnings from
     yet another compiler aren't really that valuable anyway.
     -->
-    <CPP_FLAGS>$(CPP_FLAGS)-xc++ -w -fcheck-new</CPP_FLAGS>
+    <CPP_FLAGS>$(CPP_FLAGS)-xc++ -w -fcheck-new -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics </CPP_FLAGS>
 
     <FLOATING_POINT_FLAG Condition="('$(PLATFORM_EMULATED_FLOATINGPOINT)'!='true' and '$(DEVICE_TYPE)' == 'cortex-m4') or '$(INSTRUCTION_SET)'=='thumb2fp'">-mfloat-abi=hard -mfpu=fpv4-sp-d16</FLOATING_POINT_FLAG>
-    <FLOATING_POINT_FLAG Condition="'$(PLATFORM_EMULATED_FLOATINGPOINT)'=='true'">-mfloat-abi=soft</FLOATING_POINT_FLAG>
+    <FLOATING_POINT_FLAG Condition="'$(PLATFORM_EMULATED_FLOATINGPOINT)'=='true'">-mfloat-abi=softfp -mfpu=fpv4-sp-d16</FLOATING_POINT_FLAG>
 
     <AS_CC_CPP_COMMON_FLAGS>$(AS_CC_CPP_COMMON_FLAGS) $(FLOATING_POINT_FLAG) </AS_CC_CPP_COMMON_FLAGS>
     <AS_CC_CPP_COMMON_FLAGS>$(AS_CC_CPP_COMMON_FLAGS) $(ARCH_TYPE_FLAGS)</AS_CC_CPP_COMMON_FLAGS>
@@ -126,7 +132,8 @@
     <CC_CPP_COMMON_FLAGS Condition="'$(reducesize)'=='true'" >$(CC_CPP_COMMON_FLAGS) -DHAL_REDUCESIZE</CC_CPP_COMMON_FLAGS>
     <CC_CPP_COMMON_FLAGS Condition="'$(timewarp)'=='true'"   >$(CC_CPP_COMMON_FLAGS) -DHAL_TIMEWARP</CC_CPP_COMMON_FLAGS>
     <CC_CPP_COMMON_FLAGS Condition="'$(profile)'=='true'"    >$(CC_CPP_COMMON_FLAGS) -DARM_PROFILE_ACTIVE</CC_CPP_COMMON_FLAGS>
-    <CC_CPP_COMMON_FLAGS Condition="'$(FLAVOR)'!='RTM'"    >$(CC_CPP_COMMON_FLAGS) -DTINYCLR_ENABLE_SOURCELEVELDEBUGGING </CC_CPP_COMMON_FLAGS>
+    <CC_CPP_COMMON_FLAGS Condition="'$(FLAVOR)'!='RTM'"      >$(CC_CPP_COMMON_FLAGS) -DTINYCLR_ENABLE_SOURCELEVELDEBUGGING </CC_CPP_COMMON_FLAGS>
+    <CC_CPP_COMMON_FLAGS Condition="'$(FLAVOR)'=='Instrumented'">$(CC_CPP_COMMON_FLAGS) -DTINYCLR_PROFILE_NEW -DTINYCLR_PROFILE_NEW_CALLS -DTINYCLR_PROFILE_NEW_ALLOCATIONS -DTINYCLR_PROFILE_HANDLER -DPROFILE_BUILD</CC_CPP_COMMON_FLAGS>
     <CC_CPP_COMMON_FLAGS Condition="'$(sampleprof)'=='true'" >$(CC_CPP_COMMON_FLAGS) -DFIQ_SAMPLING_PROFILER </CC_CPP_COMMON_FLAGS>
     <CC_CPP_COMMON_FLAGS Condition="'$(latencyprof)'=='true'">$(CC_CPP_COMMON_FLAGS) -DFIQ_LATENCY_PROFILER </CC_CPP_COMMON_FLAGS>
     <CC_CPP_COMMON_FLAGS Condition="'$(INSTRUCTION_SET)'=='arm'"     >$(CC_CPP_COMMON_FLAGS) -DCOMPILE_ARM </CC_CPP_COMMON_FLAGS>
@@ -211,10 +218,10 @@
 
     <!--Standard libraries -->
     <!-- NOTE: These are renamed by the "specs" provided to the command line-->
-    <GCCSTDLIBS>-lstdc++ -lsupc++ -lm -lgcc -lc -lgcc -lc</GCCSTDLIBS>
+    <GCCSTDLIBS>-lstdc++ -lsupc++ -lm -lgcc -lc </GCCSTDLIBS>
 
     <!-- Use newlib-nano (default) or newlib -->
-    <LINK_NANO_SPECS Condition="'$(NewlibNano)' != 'false'">-specs="$(GNU_LIBGCC_DIR)\nano.specs"</LINK_NANO_SPECS>
+    <LINK_NANO_SPECS Condition="'$(NewlibNano)' != 'false'">-specs="$(GNU_LIBGCC_DIR)\nano.specs" -specs="$(GNU_LIBGCC_DIR)\nosys.specs"  </LINK_NANO_SPECS>
   </PropertyGroup>
 
   <!-- item group  -->
@@ -271,9 +278,9 @@
          (platform independent). Thus the linker looks in the current working directory and finds the specified library without
          needing to list the full path for each one. 
     -->
-    <Exec WorkingDirectory="$(LIB_DIR)" Command="$(LINK) $(ARCH_TYPE_FLAGS) $(FLOATING_POINT_FLAG) -L&quot;$(GNU_LIBGCC_DIR)&quot; -specs=$(MsBuildThisFileDirectory)startfile.specs -Wl$(LINK_FLAGS),-Map=$(EXEName).map $(LINK_NANO_SPECS) -T@(EXEScatterFile,' ') @(EXEInputs,' ') -Wl,-( @(PlatformIndependentLibs->'$(PLATFORM_INDEPENDENT_RELATIVE_LIB_DIR)%(FileName)%(Extension)',' ') @(DriverLibs->'%(FileName)%(Extension)',' ') @(InputLibs,' ') -Wl,-) -Wl,-no-whole-archive -Wl,-( $(GCCSTDLIBS) -Wl,-) $(ExtraLibs) -o@(EXEOutput)" />
+    <Exec WorkingDirectory="$(LIB_DIR)" Command="$(LINK) $(ARCH_TYPE_FLAGS) $(FLOATING_POINT_FLAG) -ffunction-sections -fdata-sections -Xlinker $(ARCH_TARGETTYPE_FLAGS) -L&quot;$(GNU_LIBGCC_DIR)&quot; -specs=$(MsBuildThisFileDirectory)startfile.specs -Wl$(LINK_FLAGS),-Map=$(EXEName).map $(LINK_NANO_SPECS) -T@(EXEScatterFile,' ') @(EXEInputs,' ') -Wl,-( @(PlatformIndependentLibs->'$(PLATFORM_INDEPENDENT_RELATIVE_LIB_DIR)%(FileName)%(Extension)',' ') @(DriverLibs->'%(FileName)%(Extension)',' ') @(InputLibs,' ') -Wl,-) -Wl,-no-whole-archive -Wl,-( $(GCCSTDLIBS) -Wl,-) $(ExtraLibs) -o@(EXEOutput)" />
 
-    <Exec Command="$(OBJDUMP) -d -EL @(EXEOutput) > $(EXEName).axfdump" />
+    <Exec Command="$(OBJDUMP) -d -EL -S @(EXEOutput) > $(EXEName).axfdump" />
 
     <MakeDir Directories="$(EXEName).bin" Condition="'$(MultipleOutputSections)'=='true' and !Exists('$(EXEName).bin')" />
     <MakeDir Directories="$(EXEName).hex" Condition="'$(MultipleOutputSections)'=='true' and !Exists('$(EXEName).hex')" />