1# 2# Copyright (c) 2025-2026, Arm Limited. All rights reserved. 3# 4# SPDX-License-Identifier: BSD-3-Clause 5# 6 7GCC_V_OUTPUT := $(if $($(ARCH)-cc),$(shell $($(ARCH)-cc) -v 2>&1)) 8PIE_FOUND := $(findstring --enable-default-pie,${GCC_V_OUTPUT}) 9 10ifneq (${DEBUG}, 0) 11 cflags-common += -g -gdwarf-4 12endif #(Debug) 13 14ifeq (${AARCH32_INSTRUCTION_SET},A32) 15 cflags-aarch32 := -marm 16else ifeq (${AARCH32_INSTRUCTION_SET},T32) 17 cflags-aarch32 := -mthumb 18endif #(AARCH32_INSTRUCTION_SET) 19 20cflags-aarch32 += -mno-unaligned-access 21cflags-aarch64 := -mgeneral-regs-only -mstrict-align 22 23cflags-common += $(cflags-$(ARCH)) 24 25############################################################################## 26# WARNINGS Configuration 27############################################################################### 28# General warnings 29WARNING0 := -Wall -Wmissing-include-dirs -Wunused \ 30 -Wdisabled-optimization -Wvla -Wshadow \ 31 -Wredundant-decls 32# stricter warnings 33WARNING0 += -Wextra -Wno-trigraphs 34# too verbose for generic build 35WARNING0 += -Wno-missing-field-initializers \ 36 -Wno-type-limits -Wno-sign-compare \ 37# on clang this flag gets reset if -Wextra is set after it. No difference on gcc 38WARNING0 += -Wno-unused-parameter 39 40# Additional warnings 41# Level 1 - infrequent warnings we should have none of 42# full -Wextra 43WARNING1 := $(WARNING0) 44WARNING1 += -Wsign-compare 45WARNING1 += -Wtype-limits 46WARNING1 += -Wmissing-field-initializers 47 48# Level 2 - problematic warnings that we want 49# zlib, compiler-rt, coreboot, and mbdedtls blow up with these 50# TODO: disable just for them and move into default build 51WARNING2 := $(WARNING1) 52WARNING2 += -Wold-style-definition 53WARNING2 += -Wmissing-prototypes 54WARNING2 += -Wmissing-format-attribute 55# TF-A aims to comply with this eventually. Effort too large at present 56WARNING2 += -Wundef 57# currently very involved and many platforms set this off 58WARNING2 += -Wunused-const-variable=2 59 60# Level 3 - very pedantic, frequently ignored 61WARNING3 := $(WARNING2) 62WARNING3 += -Wbad-function-cast 63WARNING3 += -Waggregate-return 64WARNING3 += -Wnested-externs 65WARNING3 += -Wcast-align 66WARNING3 += -Wcast-qual 67WARNING3 += -Wconversion 68WARNING3 += -Wpacked 69WARNING3 += -Wpointer-arith 70WARNING3 += -Wswitch-default 71 72cflags-common += $(WARNING$(W)) 73ifneq (${E},0) 74 cflags-common += -Werror 75endif #(E) 76 77# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105523 78TF_CFLAGS_MIN_PAGE_SIZE := $(call cc_option, --param=min-pagesize=0) 79ifeq ($(HARDEN_SLS), 1) 80 TF_CFLAGS_MHARDEN_SLS := $(call cc_option, -mharden-sls=all) 81endif 82 83LTO_CFLAGS := $(if $(call bool,$(ENABLE_LTO)),-flto) 84 85# Compiler specific warnings 86cc-flags-gnu-gcc += -Wunused-but-set-variable -Wmaybe-uninitialized \ 87 -Wpacked-bitfield-compat -Wshift-overflow=2 \ 88 -Wlogical-op $(TF_CFLAGS_MIN_PAGE_SIZE) $(TF_CFLAGS_MHARDEN_SLS) 89cc-flags-llvm-clang += -Wshift-overflow -Wshift-sign-overflow \ 90 -Wlogical-op-parentheses 91# TODO: some day GCC will be able to LTO __builtin functions (i.e. the libc and 92# with it all libs). When this happens, this should become generic. This can 93# also happen when GCC14 is the oldest reasonable version we support, then this 94# can work with -ffat-lto-objects. 95cc-flags-llvm-clang += $(LTO_CFLAGS) 96 97# arm-clang has the same flags 98cc-flags-arm-clang += $(cc-flags-llvm-clang) 99 100cflags-common += ${DEFINES} ${INCLUDES} ${MBEDTLS_INC} -nostdinc 101 102cflags-common += -ffunction-sections -fdata-sections \ 103 -ffreestanding -fno-common \ 104 -Os -std=gnu99 105 106ifneq (${BP_OPTION},none) 107 cflags-common += -mbranch-protection=${BP_OPTION} 108endif #(BP_OPTION) 109 110ifeq (${SANITIZE_UB},on) 111 cflags-common += -fsanitize=undefined -fno-sanitize-recover 112endif #(${SANITIZE_UB},on) 113 114ifeq (${SANITIZE_UB},trap) 115 cflags-common += -fsanitize=undefined -fno-sanitize-recover \ 116 -fsanitize-undefined-trap-on-error 117endif #(${SANITIZE_UB},trap) 118 119ifeq (${ERROR_DEPRECATED},0) 120 cflags-common += -Wno-error=deprecated-declarations 121 cflags-common += -Wno-error=cpp 122endif #(!ERROR_DEPRECATED) 123 124################################################################################ 125# Platform specific Makefile might provide us ARCH_MAJOR/MINOR use that to come 126# up with appropriate march values for compiler. 127################################################################################ 128include ${MAKE_HELPERS_DIRECTORY}march.mk 129ifeq (${ARM_ARCH_MAJOR},7) 130include make_helpers/armv7-a-cpus.mk 131endif 132 133ifneq ($(ENABLE_FEAT_MORELLO),0) 134 TF_CFLAGS += -march=morello 135else 136 cflags-common += $(march-directive) 137endif 138 139ifneq ($(PIE_FOUND),) 140 cflags-common += -fno-PIE 141endif 142 143ifeq ($(ENABLE_LTO),1) 144ifeq ($($(ARCH)-ld-id),gnu-gcc) 145 cflags-common += -flto-partition=one 146endif 147endif 148 149cflags-common += $(TF_CFLAGS_$(ARCH)) 150cflags-common += $(CPPFLAGS) $(CFLAGS) # some platforms set these 151TF_CFLAGS += $(cflags-common) 152TF_CFLAGS += $(target-flag-$(ARCH)-$($(ARCH)-cc-id)) 153TF_CFLAGS += $(cc-flags-$($(ARCH)-cc-id)) 154 155# it's logical to give the same flags to the linker when it's invoked through 156# the compiler. This is requied for LTO to work correctly 157ifeq ($($(ARCH)-ld-id),$($(ARCH)-cc-id)) 158 TF_LDFLAGS += $(cflags-common) 159 TF_LDFLAGS += $(cc-flags-$($(ARCH)-ld-id)) 160 TF_LDFLAGS += $(LTO_CFLAGS) 161endif 162 163TF_LDFLAGS += $(target-flag-$(ARCH)-$($(ARCH)-ld-id)) 164 165ASFLAGS += -Wa,--fatal-warnings 166TF_LDFLAGS += -z noexecstack 167 168# LD = armlink 169ifeq ($($(ARCH)-ld-id),arm-link) 170 TF_LDFLAGS += --diag_error=warning --lto_level=O1 171 TF_LDFLAGS += --remove --info=unused,unusedsymbols 172 173# LD = gcc or clang 174else 175 ifeq ($($(ARCH)-ld-id),llvm-clang) 176 ldflags-common := -fuse-ld=lld 177 endif 178 179 ldflags-common += $(call ld_option,--no-warn-rwx-segments) 180 # ld.lld reports section type mismatch warnings, 181 # so don't add --fatal-warnings to it. 182 ifneq ($($(ARCH)-ld-id),$(filter $($(ARCH)-ld-id),llvm-clang llvm-lld)) 183 ldflags-common += $(call ld_prefix,--fatal-warnings) 184 endif 185 ldflags-common += $(call ld_prefix,--gc-sections) 186 ldflags-common += -z common-page-size=4096 # Configure page size constants 187 ldflags-common += -z max-page-size=4096 188 ldflags-common += $(call ld_prefix,--build-id=none) 189 ldflags-common += $(call ld_option,--sort-section=alignment) 190 191 ifeq ($(ENABLE_LTO),1) 192 ldflags-common += -fuse-linker-plugin 193 endif #(ENABLE_LTO) 194 195 ldflags-common += -nostdlib 196 197 ifneq ($(call bool,$(USE_ROMLIB)),) 198 ldflags-common += @${BUILD_PLAT}/romlib/romlib.ldflags 199 endif 200endif 201 202# Errata build flags 203ifneq ($(call bool,$(ERRATA_A53_843419)),) 204ldflags-aarch64 += $(call ld_option,--fix-cortex-a53-843419) 205else 206# GCC automatically adds fix-cortex-a53-843419 flag when used to link 207# which breaks some builds, so disable if errata fix is not explicitly enabled 208ldflags-aarch64 += $(call ld_option,--no-fix-cortex-a53-843419) 209endif 210 211ifneq ($(call bool,$(ERRATA_A53_835769)),) 212cflags-aarch64 += -mfix-cortex-a53-835769 213ldflags-aarch64 += $(call ld_option,--fix-cortex-a53-835769) 214endif 215 216ifneq ($(PIE_FOUND),) 217ifeq ($($(ARCH)-ld-id),gnu-gcc) 218 ldflags-common += -no-pie 219endif 220endif #(PIE_FOUND) 221TF_LDFLAGS += $(ldflags-common) 222TF_LDFLAGS += $(ldflags-$(ARCH)) 223 224PIE_LDFLAGS += $(call ld_prefix,-pie) 225PIE_LDFLAGS += $(call ld_prefix,--no-dynamic-linker) 226 227ifeq ($(ENABLE_PIE),1) 228 ifeq ($(RESET_TO_BL2),1) 229 ifneq ($(BL2_IN_XIP_MEM),1) 230 BL2_CPPFLAGS += -fpie 231 BL2_CFLAGS += -fpie 232 BL2_LDFLAGS += $(PIE_LDFLAGS) 233 endif #(BL2_IN_XIP_MEM) 234 endif #(RESET_TO_BL2) 235 BL31_CPPFLAGS += -fpie 236 BL31_CFLAGS += -fpie 237 BL31_LDFLAGS += $(PIE_LDFLAGS) 238 239 BL32_CPPFLAGS += -fpie 240 BL32_CFLAGS += -fpie 241 BL32_LDFLAGS += $(PIE_LDFLAGS) 242endif #(ENABLE_PIE) 243 244BL1_CPPFLAGS += -DREPORT_ERRATA=${DEBUG} 245BL31_CPPFLAGS += -DREPORT_ERRATA=${DEBUG} 246BL32_CPPFLAGS += -DREPORT_ERRATA=${DEBUG} 247 248BL1_CPPFLAGS += -DIMAGE_AT_EL3 249ifeq ($(BL2_RUNS_AT_EL3),1) 250 BL2_CPPFLAGS += -DIMAGE_AT_EL3 251else 252 BL2_CPPFLAGS += -DIMAGE_AT_EL1 253endif #(BL2_RUNS_AT_EL3) 254 255ifeq (${ARCH},aarch64) 256 BL2U_CPPFLAGS += -DIMAGE_AT_EL1 257 BL31_CPPFLAGS += -DIMAGE_AT_EL3 258 BL32_CPPFLAGS += -DIMAGE_AT_EL1 259else 260 BL32_CPPFLAGS += -DIMAGE_AT_EL3 261endif 262 263ifeq (${SPD},spmd) 264 ifeq ($(findstring optee_sp,$(ARM_SPMC_MANIFEST_DTS)),optee_sp) 265 DTC_CPPFLAGS += -DOPTEE_SP_FW_CONFIG 266 endif 267 268 ifeq ($(findstring trusty_sp,$(ARM_SPMC_MANIFEST_DTS)),trusty_sp) 269 DTC_CPPFLAGS += -DTRUSTY_SP_FW_CONFIG 270 endif 271 272 ifeq ($(TS_SP_FW_CONFIG),1) 273 DTC_CPPFLAGS += -DTS_SP_FW_CONFIG 274 endif 275 276 ifneq ($(ARM_BL2_SP_LIST_DTS),) 277 DTC_CPPFLAGS += -DARM_BL2_SP_LIST_DTS=$(ARM_BL2_SP_LIST_DTS) 278 endif 279endif 280 281 282DTC_FLAGS += -I dts -O dtb 283DTC_CPPFLAGS += -Ifdts -undef 284 285