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Make:Improve version string generation portability

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To get round problems encountered when building in a DOS build
environment the generation of the .o file containing build identifier
strings is modified.
The problems encounterred were:
   1. DOS echo doesn't strip ' characters from the output text.
   2. git is not available from CMD.EXE so the BUILD_STRING value needs
      some other origin.

A BUILD_STRING value of "development build" is used for now.

MAKE_BUILD_STRINGS is used to customise build string generation in a DOS
environment. This variable is not defined in the UNIX build environment
make file helper, and so the existing build string generation behaviour
is retained in these build environments.

NOTE: This commit completes a cumulative series aimed at improving
      build portability across development environments.
      This enables the build to run on several new build environments,
      if the relevant tools are available.
      At this point the build is tested on Windows 7 Enterprise SP1,
      using CMD.EXE, Cygwin and Msys (MinGW),as well as a native
      Linux envionment".  The Windows platform builds used
      aarch64-none-elf-gcc.exe 4.9.1.  CMD.EXE and Msys used Gnu
      Make 3.81, cygwin used Gnu Make 4.1.

CAVEAT: The cert_create tool build is not tested on the Windows
        platforms (openssl-for-windows has a GPL license).

Change-Id: Iaa4fc89dbe2a9ebae87e2600c9eef10a6af30251
This commit is contained in:
Evan Lloyd 2015-12-03 12:58:52 +00:00
parent 51b27702e4
commit 414ab8530d
3 changed files with 23 additions and 0 deletions
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3
docs/user-guide.md
View file

@ -42,6 +42,9 @@ The software has been tested on Ubuntu 14.04 LTS (64-bit). Packages used for
building the software were installed from that distribution unless otherwise
specified.
The software has also been built on Windows 7 Enterprise SP1, using CMD.EXE,
Cygwin, and Msys (MinGW) shells, using version 4.9.1 of the GNU toolchain.
3. Tools
---------

4
make_helpers/build_macros.mk
View file

@ -346,9 +346,13 @@ $(eval $(call MAKE_LD,$(LINKERFILE),$(BL_LINKERFILE)))
$(ELF): $(OBJS) $(LINKERFILE) | bl$(1)_dirs
@echo " LD $$@"
ifdef MAKE_BUILD_STRINGS
$(call MAKE_BUILD_STRINGS, $(BUILD_DIR)/build_message.o)
else
@echo 'const char build_message[] = "Built : "$(BUILD_MESSAGE_TIMESTAMP); \
const char version_string[] = "${VERSION_STRING}";' | \
$$(CC) $$(CFLAGS) -xc - -o $(BUILD_DIR)/build_message.o
endif
$$(Q)$$(LD) -o $$@ $$(LDFLAGS) -Map=$(MAPFILE) --script $(LINKERFILE) \
$(BUILD_DIR)/build_message.o $(OBJS)

16
make_helpers/windows.mk
View file

@ -91,3 +91,19 @@ ${1} : ${2}
endif
# Because git is not available from CMD.EXE, we need to avoid
# the BUILD_STRING generation which uses git.
# For now we use "development build".
# This can be overridden from the command line or environment.
BUILD_STRING ?= development build
# The DOS echo shell command does not strip ' characters from the command
# parameters before printing. We therefore use an alternative method invoked
# by defining the MAKE_BUILD_STRINGS macro.
BUILT_TIME_DATE_STRING = const char build_message[] = "Built : "${BUILD_MESSAGE_TIMESTAMP};
VERSION_STRING_MESSAGE = const char version_string[] = "${VERSION_STRING}";
define MAKE_BUILD_STRINGS
@echo $$(BUILT_TIME_DATE_STRING) $$(VERSION_STRING_MESSAGE) | \
$$(CC) $$(CFLAGS) -x c - -o $1
endef