feat(fiptool): add ability to build statically

Provide a STATIC command line build option for platforms willing to
build fiptool statically and remove dependency to toolchain and OpenSSL
libraries.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I1d1b6676df50081828170e2b0ab7b71c4ec19d6e

tools/fiptool/Makefile

@@ -13,8 +13,7 @@ FIPTOOL ?= fiptool${BIN_EXT}
 PROJECT := $(notdir ${FIPTOOL})
 OBJECTS := fiptool.o tbbr_config.o
 V ?= 0
-OPENSSL_DIR := /usr
-
+STATIC ?= 0
 
 override CPPFLAGS += -D_GNU_SOURCE -D_XOPEN_SOURCE=700
 HOSTCCFLAGS := -Wall -Werror -pedantic -std=c99
@@ -24,14 +23,22 @@ else
   HOSTCCFLAGS += -O2
 endif
 
+INCLUDE_PATHS := -I../../include/tools_share
+
+DEFINES += -DSTATIC=$(STATIC)
+
+ifeq (${STATIC},1)
+LDOPTS := -static
+else
+OPENSSL_DIR := /usr
+
 # Select OpenSSL version flag according to the OpenSSL build selected
 # from setting the OPENSSL_DIR path.
 $(eval $(call SELECT_OPENSSL_API_VERSION))
 
-HOSTCCFLAGS += ${DEFINES}
 # USING_OPENSSL3 flag will be added to the HOSTCCFLAGS variable with the proper
 # computed value.
-HOSTCCFLAGS += -DUSING_OPENSSL3=$(USING_OPENSSL3)
+DEFINES += -DUSING_OPENSSL3=$(USING_OPENSSL3)
 
 # Include library directories where OpenSSL library files are located.
 # For a normal installation (i.e.: when ${OPENSSL_DIR} = /usr or
@@ -39,7 +46,11 @@ HOSTCCFLAGS += -DUSING_OPENSSL3=$(USING_OPENSSL3)
 # directory. However, for a local build of OpenSSL, the built binaries are
 # located under the main project directory (i.e.: ${OPENSSL_DIR}, not
 # ${OPENSSL_DIR}/lib/).
-LDLIBS := -L${OPENSSL_DIR}/lib -L${OPENSSL_DIR} -lcrypto
+LDOPTS := -L${OPENSSL_DIR}/lib -L${OPENSSL_DIR} -lcrypto
+INCLUDE_PATHS += -I${OPENSSL_DIR}/include
+endif # STATIC
+
+HOSTCCFLAGS += ${DEFINES}
 
 ifeq (${V},0)
   Q := @
@@ -47,8 +58,6 @@ else
   Q :=
 endif
 
-INCLUDE_PATHS := -I../../include/tools_share  -I${OPENSSL_DIR}/include
-
 HOSTCC ?= gcc
 
 ifneq (${PLAT},)
@@ -72,7 +81,7 @@ all: --openssl ${PROJECT}
 
 ${PROJECT}: ${OBJECTS} Makefile
 	@echo "  HOSTLD  $@"
-	${Q}${HOSTCC} ${OBJECTS} -o $@ ${LDLIBS}
+	${Q}${HOSTCC} ${OBJECTS} -o $@ $(LDOPTS)
 	@${ECHO_BLANK_LINE}
 	@echo "Built $@ successfully"
 	@${ECHO_BLANK_LINE}
@@ -84,10 +93,11 @@ ${PROJECT}: ${OBJECTS} Makefile
 -include $(DEPS)
 
 --openssl:
+ifeq ($(STATIC),0)
 ifeq ($(DEBUG),1)
 	@echo "Selected OpenSSL version: ${OPENSSL_CURRENT_VER}"
 endif
-
+endif # STATIC
 
 clean:
 	$(call SHELL_DELETE_ALL, ${PROJECT} ${OBJECTS} $(DEPS))

tools/fiptool/fiptool.c

@@ -460,6 +460,7 @@ static struct option *fill_common_opts(struct option *opts, size_t *nr_opts,
 	return opts;
 }
 
+#if !STATIC
 static void md_print(const unsigned char *md, size_t len)
 {
 	size_t i;
@@ -467,6 +468,7 @@ static void md_print(const unsigned char *md, size_t len)
 	for (i = 0; i < len; i++)
 		printf("%02x", md[i]);
 }
+#endif
 
 static int info_cmd(int argc, char *argv[])
 {
@@ -498,7 +500,13 @@ static int info_cmd(int argc, char *argv[])
 		       (unsigned long long)image->toc_e.offset_address,
 		       (unsigned long long)image->toc_e.size,
 		       desc->cmdline_name);
-#ifndef _MSC_VER	/* We don't have SHA256 for Visual Studio. */
+
+		/*
+		 * Omit this informative code portion for:
+		 * Visual Studio missing SHA256.
+		 * Statically linked builds.
+		 */
+#if !defined(_MSC_VER) && !STATIC
 		if (verbose) {
 			unsigned char md[SHA256_DIGEST_LENGTH];