it seems to be not working for virtualbox
DEB_BUILD_MAINT_OPTIONS=hardening=-pie

/usr/bin/kmk_redirect -wo 
/build/virtualbox-5.0.20-dfsg/out/obj/RuntimeR3/common/math/RTUInt128MulByU64.o.dep
 -- yasm -DKBUILD_GENERATING_MAKEFILE_DEPENDENCIES -f elf64 -DASM_FORMAT_ELF 
-D__YASM__ -Worphan-labels -g dwarf2 
-I/build/virtualbox-5.0.20-dfsg/src/VBox/Runtime/include/ 
-I/build/virtualbox-5.0.20-dfsg/src/libs/liblzf-3.4/ 
-I/build/virtualbox-5.0.20-dfsg/src/libs/kStuff/kStuff/include/ 
-I/build/virtualbox-5.0.20-dfsg/out/obj/RuntimeR3/dtrace/ 
-I/usr/include/libxml2/ -I/build/virtualbox-5.0.20-dfsg/include/ 
-I/build/virtualbox-5.0.20-dfsg/out/ -DVBOX -DVBOX_OSE 
-DVBOX_WITH_64_BITS_GUESTS -DVBOX_WITH_DEBUGGER -DRT_OS_LINUX 
-D_FILE_OFFSET_BITS=64 -DRT_ARCH_AMD64 -D__AMD64__ -D_REENTRANT -DIN_RT_STATIC 
-DIN_RT_R3 -DIN_SUP_STATIC -DIN_RING3 -DHC_ARCH_BITS=64 -DGC_ARCH_BITS=64 
-DVBOX_WITH_DTRACE -DVBOX_WITH_DTRACE_R3 -DIN_RT_R3 -DIN_SUP_R3 
-DLDR_WITH_NATIVE -DLDR_WITH_ELF32 -DLDR_WITH_PE -DRT_WITH_VBOX -DRT_NO_GIP 
-DRT_WITHOUT_NOCRT_WRAPPERS -DIPRT_WITH_OPENSSL -DLDR_WITH_KLDR -DR
 T_WITH_ICONV_CACHE -o 
/build/virtualbox-5.0.20-dfsg/out/obj/RuntimeR3/common/math/RTUInt128MulByU64.o 
/build/virtualbox-5.0.20-dfsg/src/VBox/Runtime/common/math/RTUInt128MulByU64.asm
 -M
kBuild: Compiling RuntimeR0 - 
/build/virtualbox-5.0.20-dfsg/src/VBox/Runtime/common/log/logcom.cpp => 
/build/virtualbox-5.0.20-dfsg/out/obj/RuntimeR0/common/log/logcom.o
g++ -c -O2 -nostdinc -g -pipe -Werror -pedantic -Wshadow -Wshadow -Wall -Wextra 
-Wno-missing-field-initializers -Wno-unused -Wno-trigraphs 
-fdiagnostics-show-option -Wno-unused-parameter -Wlogical-op -Wno-long-long 
-Wno-long-long -Wno-delete-non-virtual-dtor -Wno-variadic-macros -O2 
-mtune=generic -fno-omit-frame-pointer -fno-strict-aliasing -fno-exceptions 
-fno-stack-protector -fno-common -fvisibility-inlines-hidden 
-fvisibility=hidden -DVBOX_HAVE_VISIBILITY_HIDDEN -DRT_USE_VISIBILITY_DEFAULT 
-fno-rtti  -m64 -mno-red-zone -mcmodel=kernel -mno-sse -mno-mmx -mno-sse2 
-mno-3dnow -fno-asynchronous-unwind-tables 
-I/build/virtualbox-5.0.20-dfsg/src/VBox/Runtime/include 
-I/build/virtualbox-5.0.20-dfsg/include/iprt/nocrt 
-I/build/virtualbox-5.0.20-dfsg/out/obj/RuntimeR0/dtrace 
-I/build/virtualbox-5.0.20-dfsg/include -I/build/virtualbox-5.0.20-dfsg/out 
-DVBOX -DVBOX_OSE -DVBOX_WITH_64_BITS_GUESTS -DVBOX_WITH_DEBUGGER -DRT_OS_LINUX 
-D_FILE_OFFSET_BITS=64 -DRT_ARCH_AMD64 -D__AMD64__ -DVBOX_WIT
 H_HARDENING -DRTPATH_APP_PRIVATE=\"/usr/share/virtualbox\" 
-DRTPATH_APP_PRIVATE_ARCH=\"/usr/lib/virtualbox\" 
-DRTPATH_SHARED_LIBS=\"/usr/lib/virtualbox\" 
-DRTPATH_APP_DOCS=\"/usr/share/doc/virtualbox\" -DIN_RING0 -DIN_RING0_AGNOSTIC 
-DIPRT_NO_CRT -DRT_WITH_NOCRT_ALIASES -DHC_ARCH_BITS=64 -DGC_ARCH_BITS=64 
-DVBOX_WITH_DTRACE -DVBOX_WITH_DTRACE_R0 -DIN_RT_R0 -DRT_WITH_VBOX 
-Wp,-MD,/build/virtualbox-5.0.20-dfsg/out/obj/RuntimeR0/common/log/logcom.o.dep 
-Wp,-MT,/build/virtualbox-5.0.20-dfsg/out/obj/RuntimeR0/common/log/logcom.o 
-Wp,-MP -o /build/virtualbox-5.0.20-dfsg/out/obj/RuntimeR0/common/log/logcom.o 
/build/virtualbox-5.0.20-dfsg/src/VBox/Runtime/common/log/logcom.cpp
/build/virtualbox-5.0.20-dfsg/src/VBox/Runtime/common/log/logellipsis.cpp:1:0: 
error: code model kernel does not support PIC mode
 /* $Id: logellipsis.cpp $ */
 ^
/build/virtualbox-5.0.20-dfsg/src/VBox/Runtime/common/log/logrelellipsis.cpp:1:0:
 error: code model kernel does not support PIC mode
 /* $Id: logrelellipsis.cpp $ */
 ^

not sure why, there is no mention of fPIC in the logs.

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https://bugs.launchpad.net/bugs/1576915

Title:
  dpkg-buildflags should explicitly pass -fno-PIE and -no-pie if
  DEB_BUILD_HARDENING_PIE=0 is set

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