Allow either libftdi or libftdi1 at compile time.

Signed-off-by: Todd Broch <tbroch@chromium.org>

BRANCH=none
BUG=chromium:222299
TEST=manual, from chroot:

1. Install libftdi1 (https://gerrit.chromium.org/gerrit/#/c/44731/)
2. cd <path>/ec && make -B
   - compiles successfully
3. Install libftdi
4. cd <path>/ec && make -B
   - still compiles successfully

Change-Id: I6818d53faa1389937872b0a9826534db4760e448
Reviewed-on: https://gerrit.chromium.org/gerrit/47875
Tested-by: Todd Broch <tbroch@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Todd Broch <tbroch@chromium.org>

Makefile.toolchain

@@ -15,6 +15,7 @@ CPP=$(CROSS_COMPILE)cpp
 LD=$(CROSS_COMPILE)ld
 OBJCOPY=$(CROSS_COMPILE)objcopy
 OBJDUMP=$(CROSS_COMPILE)objdump
+PKG_CONFIG?=pkg-config
 BUILDCC?=gcc
 HOSTCC?=$(HOST_CROSS_COMPILE)gcc
 
@@ -33,7 +34,18 @@ CFLAGS_DEFINE=-DOUTDIR=$(out) -DCHIP=$(CHIP) -DBOARD_TASKFILE=ec.tasklist \
               -DCHIP_VARIANT_$(CHIP_VARIANT) -DPROJECT=$(PROJECT)
 CPPFLAGS=$(CFLAGS_DEFINE) $(CFLAGS_INCLUDE) $(CFLAGS_TEST) $(EXTRA_CFLAGS)
 CFLAGS=$(CPPFLAGS) $(CFLAGS_CPU) $(CFLAGS_DEBUG) $(CFLAGS_WARN) $(CFLAGS_y)
-BUILD_CFLAGS=$(CPPFLAGS) -O3 $(CFLAGS_DEBUG) $(CFLAGS_WARN)
+
+FTDIVERSION=$(shell $(PKG_CONFIG) --modversion libftdi1 2>/dev/null)
+ifneq ($(FTDIVERSION),)
+  LIBFTDI_NAME=ftdi1
+else
+  LIBFTDI_NAME=ftdi
+endif
+
+LIBFTDI_CFLAGS=$(shell $(PKG_CONFIG) --cflags lib${LIBFTDI_NAME})
+LIBFTDI_LDLIBS=$(shell $(PKG_CONFIG) --libs   lib${LIBFTDI_NAME})
+
+BUILD_CFLAGS= $(LIBFTDI_CFLAGS) $(CPPFLAGS) -O3 $(CFLAGS_DEBUG) $(CFLAGS_WARN)
 HOST_CFLAGS=$(CPPFLAGS) -O3 $(CFLAGS_DEBUG) $(CFLAGS_WARN)
 LDFLAGS=-nostdlib -X
-BUILD_LDFLAGS=-lftdi
+BUILD_LDFLAGS=$(LIBFTDI_LDLIBS)

util/ec_uartd.c

@@ -19,8 +19,11 @@
 #endif
 
 #include <fcntl.h>
+#pragma GCC diagnostic ignored "-Wstrict-prototypes"
 #include <ftdi.h>
+#pragma GCC diagnostic pop
 #include <getopt.h>
+#include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>