Why is vmStructs.cpp compiled with -O0?

[Severin Gehwolf]

Hi,

Does anybody know why vmStructs.cpp gets an override in
JvmOverrideFiles.gmk:

$ grep -C3 -n vmStructs.cpp make/hotspot/lib/JvmOverrideFiles.gmk
30-# status for individual files on specific platforms.
31-
32-ifeq ($(TOOLCHAIN_TYPE), gcc)
33:  BUILD_LIBJVM_vmStructs.cpp_CXXFLAGS := -fno-var-tracking-assignments -O0
34-  BUILD_LIBJVM_jvmciCompilerToVM.cpp_CXXFLAGS := -fno-var-tracking-assignments
35-  BUILD_LIBJVM_jvmciCompilerToVMInit.cpp_CXXFLAGS := -fno-var-tracking-assignments
36-  BUILD_LIBJVM_assembler_x86.cpp_CXXFLAGS := -Wno-maybe-uninitialized

It seems to have been introduced with the new build system. JDK 8
doesn't seem to have it. Thoughts?

Thanks,
Severin