We want to pass ${DEBUG_PREFIX_MAP} to gcc commands and also pass in
 --debug-prefix-map to nasm (we carry a patch to nasm for this). The
tools definitions file is built by ovmf-native so we need to pass this in
at target build time when we know the right values so we use the environment.

By using determininistc file paths during the ovmf build, it removes the 
opportunitity for gcc/ld to change the output binaries due to path lengths 
overflowing section sizes and causing small changes in the binary output. 
Previously we relied on the stripped output being the same which isn't always
the case if the size of the debug symbols varies.

Upstream-Status: Pending [gcc parts may be upstreamable, nasm patch isn't upstream yet]
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>


Index: git/BaseTools/Conf/tools_def.template
===================================================================
--- git.orig/BaseTools/Conf/tools_def.template
+++ git/BaseTools/Conf/tools_def.template
@@ -1918,7 +1918,7 @@ NOOPT_*_*_OBJCOPY_ADDDEBUGFLAG     = --a
 *_*_*_DTCPP_PATH                   = DEF(DTCPP_BIN)
 *_*_*_DTC_PATH                     = DEF(DTC_BIN)
 
-DEFINE GCC_ALL_CC_FLAGS            = -g -Os -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -include AutoGen.h -fno-common
+DEFINE GCC_ALL_CC_FLAGS            = -g -Os -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -include AutoGen.h -fno-common ENV(GCC_PREFIX_MAP)
 DEFINE GCC_IA32_CC_FLAGS           = DEF(GCC_ALL_CC_FLAGS) -m32 -malign-double -freorder-blocks -freorder-blocks-and-partition -O2 -mno-stack-arg-probe
 DEFINE GCC_X64_CC_FLAGS            = DEF(GCC_ALL_CC_FLAGS) -mno-red-zone -Wno-address -mno-stack-arg-probe
 DEFINE GCC_ARM_CC_FLAGS            = DEF(GCC_ALL_CC_FLAGS) -mlittle-endian -mabi=aapcs -fno-short-enums -funsigned-char -ffunction-sections -fdata-sections -fomit-frame-pointer -Wno-address -mthumb -mfloat-abi=soft -fno-pic -fno-pie
@@ -1936,8 +1936,8 @@ DEFINE GCC_IA32_X64_ASLDLINK_FLAGS = -fu
 DEFINE GCC_ARM_ASLDLINK_FLAGS      = DEF(GCC_ARM_DLINK_FLAGS) -Wl,--entry,ReferenceAcpiTable -u $(IMAGE_ENTRY_POINT) DEF(GCC_ARM_AARCH64_ASLDLINK_FLAGS)
 DEFINE GCC_AARCH64_ASLDLINK_FLAGS  = DEF(GCC_AARCH64_DLINK_FLAGS) -Wl,--entry,ReferenceAcpiTable -u $(IMAGE_ENTRY_POINT) DEF(GCC_ARM_AARCH64_ASLDLINK_FLAGS)
 DEFINE GCC_IA32_X64_DLINK_FLAGS    = DEF(GCC_IA32_X64_DLINK_COMMON) --entry _$(IMAGE_ENTRY_POINT) --file-alignment 0x20 --section-alignment 0x20 -Map $(DEST_DIR_DEBUG)/$(BASE_NAME).map
-DEFINE GCC_ASM_FLAGS               = -c -x assembler -imacros AutoGen.h
-DEFINE GCC_PP_FLAGS                = -E -x assembler-with-cpp -include AutoGen.h
+DEFINE GCC_ASM_FLAGS               = -c -x assembler -imacros AutoGen.h ENV(GCC_PREFIX_MAP)
+DEFINE GCC_PP_FLAGS                = -E -x assembler-with-cpp -include AutoGen.h ENV(GCC_PREFIX_MAP)
 DEFINE GCC_VFRPP_FLAGS             = -x c -E -P -DVFRCOMPILE --include $(MODULE_NAME)StrDefs.h
 DEFINE GCC_ASLPP_FLAGS             = -x c -E -include AutoGen.h
 DEFINE GCC_ASLCC_FLAGS             = -x c
@@ -2082,7 +2082,7 @@ DEFINE GCC_PP_FLAGS
 *_GCC48_IA32_DLINK2_FLAGS         = DEF(GCC48_IA32_DLINK2_FLAGS)
 *_GCC48_IA32_RC_FLAGS             = DEF(GCC_IA32_RC_FLAGS)
 *_GCC48_IA32_OBJCOPY_FLAGS        =
-*_GCC48_IA32_NASM_FLAGS           = -f elf32
+*_GCC48_IA32_NASM_FLAGS           = -f elf32 ENV(NASM_PREFIX_MAP)
 
   DEBUG_GCC48_IA32_CC_FLAGS       = DEF(GCC48_IA32_CC_FLAGS) -Os
 RELEASE_GCC48_IA32_CC_FLAGS       = DEF(GCC48_IA32_CC_FLAGS) -Os -Wno-unused-but-set-variable
@@ -2110,7 +2110,7 @@ RELEASE_GCC48_IA32_CC_FLAGS       = DEF(
 *_GCC48_X64_DLINK2_FLAGS         = DEF(GCC48_X64_DLINK2_FLAGS)
 *_GCC48_X64_RC_FLAGS             = DEF(GCC_X64_RC_FLAGS)
 *_GCC48_X64_OBJCOPY_FLAGS        =
-*_GCC48_X64_NASM_FLAGS           = -f elf64
+*_GCC48_X64_NASM_FLAGS           = -f elf64 ENV(NASM_PREFIX_MAP)
 
   DEBUG_GCC48_X64_CC_FLAGS       = DEF(GCC48_X64_CC_FLAGS) -Os
 RELEASE_GCC48_X64_CC_FLAGS       = DEF(GCC48_X64_CC_FLAGS) -Os -Wno-unused-but-set-variable
@@ -2222,7 +2222,7 @@ RELEASE_GCC48_AARCH64_CC_FLAGS   = DEF(G
 *_GCC49_IA32_DLINK2_FLAGS         = DEF(GCC49_IA32_DLINK2_FLAGS)
 *_GCC49_IA32_RC_FLAGS             = DEF(GCC_IA32_RC_FLAGS)
 *_GCC49_IA32_OBJCOPY_FLAGS        =
-*_GCC49_IA32_NASM_FLAGS           = -f elf32
+*_GCC49_IA32_NASM_FLAGS           = -f elf32 ENV(NASM_PREFIX_MAP)
 
   DEBUG_GCC49_IA32_CC_FLAGS       = DEF(GCC49_IA32_CC_FLAGS) -Os
 RELEASE_GCC49_IA32_CC_FLAGS       = DEF(GCC49_IA32_CC_FLAGS) -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
@@ -2250,7 +2250,7 @@ RELEASE_GCC49_IA32_CC_FLAGS       = DEF(
 *_GCC49_X64_DLINK2_FLAGS         = DEF(GCC49_X64_DLINK2_FLAGS)
 *_GCC49_X64_RC_FLAGS             = DEF(GCC_X64_RC_FLAGS)
 *_GCC49_X64_OBJCOPY_FLAGS        =
-*_GCC49_X64_NASM_FLAGS           = -f elf64
+*_GCC49_X64_NASM_FLAGS           = -f elf64 ENV(NASM_PREFIX_MAP)
 
   DEBUG_GCC49_X64_CC_FLAGS       = DEF(GCC49_X64_CC_FLAGS) -Os
 RELEASE_GCC49_X64_CC_FLAGS       = DEF(GCC49_X64_CC_FLAGS) -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
@@ -2368,7 +2368,7 @@ RELEASE_GCC49_AARCH64_DLINK_XIPFLAGS = -
 *_GCC5_IA32_DLINK2_FLAGS         = DEF(GCC5_IA32_DLINK2_FLAGS) -no-pie
 *_GCC5_IA32_RC_FLAGS             = DEF(GCC_IA32_RC_FLAGS)
 *_GCC5_IA32_OBJCOPY_FLAGS        =
-*_GCC5_IA32_NASM_FLAGS           = -f elf32
+*_GCC5_IA32_NASM_FLAGS           = -f elf32 ENV(NASM_PREFIX_MAP)
 
   DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -flto -Os
   DEBUG_GCC5_IA32_DLINK_FLAGS    = DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,-m,elf_i386,--oformat=elf32-i386
@@ -2400,7 +2400,7 @@ RELEASE_GCC5_IA32_DLINK_FLAGS    = DEF(G
 *_GCC5_X64_DLINK2_FLAGS          = DEF(GCC5_X64_DLINK2_FLAGS)
 *_GCC5_X64_RC_FLAGS              = DEF(GCC_X64_RC_FLAGS)
 *_GCC5_X64_OBJCOPY_FLAGS         =
-*_GCC5_X64_NASM_FLAGS            = -f elf64
+*_GCC5_X64_NASM_FLAGS            = -f elf64 ENV(NASM_PREFIX_MAP)
 
   DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -flto -DUSING_LTO -Os
   DEBUG_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS) -flto -Os