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build system: Changes for xc32 compiler

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Three changes are needed to accommodate xc32 compiler build:
- optimized build flag other than -Os
   added CFLAGS_OPTIMIZED that defaults to -Os but can be overridden in boards
- build without -lnosys
   added LIBS_GCC with default libraries that can be changed in boards
- build without LD_FILE specification
   if LD_FILE is empty -Wl,-T options is not added to LDFLAGS
This commit is contained in:
Jerzy Kasenberg 2021-12-26 22:19:07 +01:00
parent a6789b5d5a
commit 5c5ecea6f1
2 changed files with 11 additions and 3 deletions
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4
examples/make.mk
View File

@ -54,6 +54,8 @@ endif
#-------------- Cross Compiler ------------ #-------------- Cross Compiler ------------
# Can be set by board, default to ARM GCC # Can be set by board, default to ARM GCC
CROSS_COMPILE ?= arm-none-eabi- CROSS_COMPILE ?= arm-none-eabi-
# Allow for -Os to be changed by board makefiles in case -Os is not allowed
CFLAGS_OPTIMIZED ?= -Os
CC = $(CROSS_COMPILE)gcc CC = $(CROSS_COMPILE)gcc
CXX = $(CROSS_COMPILE)g++ CXX = $(CROSS_COMPILE)g++
@ -112,7 +114,7 @@ CFLAGS += \
ifeq ($(DEBUG), 1) ifeq ($(DEBUG), 1)
CFLAGS += -Og CFLAGS += -Og
else else
CFLAGS += -Os CFLAGS += $(CFLAGS_OPTIMIZED)
endif endif
# Log level is mapped to TUSB DEBUG option # Log level is mapped to TUSB DEBUG option

10
examples/rules.mk
View File

@ -12,8 +12,10 @@ ifeq (,$(findstring $(FAMILY),esp32s2 esp32s3 rp2040))
# Compiler Flags # Compiler Flags
# --------------------------------------- # ---------------------------------------
LIBS_GCC ?= -lgcc -lm -lnosys
# libc # libc
LIBS += -lgcc -lm -lnosys LIBS += $(LIBS_GCC)
ifneq ($(BOARD), spresense) ifneq ($(BOARD), spresense)
LIBS += -lc LIBS += -lc
@ -49,7 +51,11 @@ ifeq ($(NO_LTO),1)
CFLAGS := $(filter-out -flto,$(CFLAGS)) CFLAGS := $(filter-out -flto,$(CFLAGS))
endif endif
LDFLAGS += $(CFLAGS) -Wl,-T,$(TOP)/$(LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections ifneq ($(LD_FILE),)
LDFLAGS_LD_FILE ?= -Wl,-T,$(TOP)/$(LD_FILE)
endif
LDFLAGS += $(CFLAGS) $(LDFLAGS_LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections
ifneq ($(SKIP_NANOLIB), 1) ifneq ($(SKIP_NANOLIB), 1)
LDFLAGS += -specs=nosys.specs -specs=nano.specs LDFLAGS += -specs=nosys.specs -specs=nano.specs
endif endif