<tr>
<td>TARGET</td>
<td>Name of the application output file prefix (e.g. `TestApplication`).</td>
- </tr>
+ </tr>
<tr>
<td>ARCH</td>
<td>Target device architecture (e.g. `AVR8`).</td>
<table>
<tbody>
<tr>
+ <td>COMPILER_PATH</td>
+ <td>Path to the compiler to use, in case a specific compiler should be substituted for the one in the system's `PATH` variable. Default is blank (use `PATH` provided compiler).</td>
+ </tr>
+ <tr>
<td>OPTIMIZATION</td>
<td>Optimization level to use when compiling C and C++ source files. Default is `s` (optimize for smallest size).</td>
</tr>
<td>Boolean, if `Y` linker relaxations will be enabled to slightly reduce the resulting binary's size. Default is `Y`.</td>
</tr>
<tr>
+ <td>JUMP_TABLES</td>
+ <td>Boolean, if `Y` jump tables will be enabled to slightly reduce the resulting binary's size - note that this can cause incorrect jumps if the binary is relocated after compilation, such as for a bootloader. Default is `N`.</td>
+ </tr>
+ <tr>
<td>OBJDIR</td>
<td>Directory to store the intermediate object files, as they are generated from the source files. Default is `obj`.</td>
</tr>
<td>DEBUG_LEVEL</td>
<td>Level of the debugging information to generate in the compiled object files. Debug is 2 (medium level debugging information).</td>
</tr>
- <tr>
- <td>COMPILER_PATH</td>
- <td>Path to the compiler to use, in case a specific compiler should be substituted for the one in the system's `PATH` variable. Default is blank (use `PATH` provided compiler).</td>
- </tr>
</tbody>
</table>
The changes to this module since its initial release are listed below, as of the
DMBS version where the change was made.
+### 20170426
+Added `JUMP_TABLES` optional variable.
+
### 20160403
Initial release.
DMBS_BUILD_MODULES += GCC
DMBS_BUILD_TARGETS += size symbol-sizes all lib elf bin hex lss clean mostlyclean
DMBS_BUILD_MANDATORY_VARS += TARGET ARCH MCU SRC
-DMBS_BUILD_OPTIONAL_VARS += BOARD OPTIMIZATION C_STANDARD CPP_STANDARD F_CPU C_FLAGS CPP_FLAGS ASM_FLAGS CC_FLAGS LD_FLAGS OBJDIR OBJECT_FILES DEBUG_TYPE DEBUG_LEVEL LINKER_RELAXATIONS COMPILER_PATH
+DMBS_BUILD_OPTIONAL_VARS += COMPILER_PATH OPTIMIZATION C_STANDARD CPP_STANDARD F_CPU C_FLAGS CPP_FLAGS ASM_FLAGS CC_FLAGS LD_FLAGS OBJDIR OBJECT_FILES DEBUG_TYPE DEBUG_LEVEL LINKER_RELAXATIONS JUMP_TABLES
DMBS_BUILD_PROVIDED_VARS +=
DMBS_BUILD_PROVIDED_MACROS +=
DEBUG_FORMAT ?= dwarf-2
DEBUG_LEVEL ?= 2
LINKER_RELAXATIONS ?= Y
+JUMP_TABLES ?= N
# Sanity check user supplied values
$(foreach MANDATORY_VAR, $(DMBS_BUILD_MANDATORY_VARS), $(call ERROR_IF_UNSET, $(MANDATORY_VAR)))
$(call ERROR_IF_EMPTY, DEBUG_FORMAT)
$(call ERROR_IF_EMPTY, DEBUG_LEVEL)
$(call ERROR_IF_NONBOOL, LINKER_RELAXATIONS)
+$(call ERROR_IF_NONBOOL, JUMP_TABLES)
# Determine the utility prefix to use for the selected architecture
ifeq ($(ARCH), AVR8)
BASE_CC_FLAGS += -DF_CPU=$(F_CPU)UL
endif
ifeq ($(LINKER_RELAXATIONS), Y)
-BASE_CC_FLAGS += -mrelax
+ BASE_CC_FLAGS += -mrelax
+endif
+ifeq ($(JUMP_TABLES), N)
+ # This flag is required for bootloaders as GCC will emit invalid jump table
+ # assembly code for devices with large amounts of flash; the jump table target
+ # is extracted from FLASH without using the correct ELPM instruction, resulting
+ # in a pseudo-random jump target.
+ BASE_CC_FLAGS += -fno-jump-tables
endif
# Additional language specific compiler flags
BASE_CPP_FLAGS := -x c++ -O$(OPTIMIZATION) -std=$(CPP_STANDARD)
BASE_ASM_FLAGS := -x assembler-with-cpp
-# This flag is required for bootloaders as GCC will emit invalid jump table
-# assembly code for devices with large amounts of flash; the jump table target
-# is extracted from FLASH without using the correct ELPM instruction, resulting
-# in a pseudo-random jump target.
-BASE_CC_FLAGS += -fno-jump-tables
-
# Create a list of flags to pass to the linker
BASE_LD_FLAGS := -lm -Wl,-Map=$(TARGET).map,--cref -Wl,--gc-sections
ifeq ($(LINKER_RELAXATIONS), Y)
projects / pub / lufa.git / commitdiff