[build] Modify Makefile and travis script to fix Travis failures (#2987)

Author: galv

.travis.yml

@@ -49,7 +49,7 @@ script:
  # for the explanation why extra switches needed for clang with ccache.
  - CXX="ccache clang++-3.8 -Qunused-arguments -fcolor-diagnostics -Wno-tautological-compare"
  CFLAGS=""
- LDFLAGS="-llapack"
+ LDFLAGS="-llapack -Wl,-fuse-ld=gold"
  INCDIRS="$XROOT/usr/include"
  LIBDIRS="$XROOT/usr/lib"
  tools/extras/travis_script.sh

src/Makefile

@@ -31,16 +31,9 @@ include kaldi.mk
 
 # Reset the default goal, so that the all target will become default
 .DEFAULT_GOAL :=
-all:
-$(MAKE) checkversion
-$(MAKE) kaldi.mk
-$(MAKE) mklibdir
-$(MAKE) subdirs
-$(MAKE) -C matrix test
+all: $(SUBDIRS) matrix/test
 -echo Done
 
-subdirs: $(SUBDIRS)
-
 mklibdir:
 test -d $(KALDILIBDIR) || mkdir $(KALDILIBDIR)
 
@@ -139,11 +132,11 @@ ext_depend: check_portaudio
 
 
 .PHONY: $(SUBDIRS)
-$(SUBDIRS) : mklibdir
+$(SUBDIRS) : checkversion kaldi.mk mklibdir
 $(MAKE) -C $@
 
 .PHONY: $(EXT_SUBDIRS)
-$(EXT_SUBDIRS) : mklibdir ext_depend
+$(EXT_SUBDIRS) : checkversion kaldi.mk mklibdir ext_depend
 $(MAKE) -C $@