Linking boost libraries in makefile under cygwin - c++

Question

I'm trying to link my program with boost libraries using makefile with cygwin. Here is my makefile:
CXX = g++
CXXFLAGS = -Wno-signed-compare -Wall -std=c++11 -funsigned-char -I /cygdrive/e/boost/include/boost-1_55/boost
LNKFLAGS = -L cygdrive/e/boost/lib
SRCDIR = src
OUTDIR = bin
EXEC = $(OUTDIR)/prg
SOURCES = $(wildcard src/*.cpp)
OBJECTS := $(SOURCES:$(SRCDIR)/%.cpp=$(OUTDIR)/%.o)
all: $(EXEC)
$(EXEC): $(OBJECTS)
$(CXX) $(LNKFLAGS) $(OBJECTS) -o $(EXEC) -l boost_thread
$(OBJECTS): $(OUTDIR)/%.o : $(SRCDIR)/%.cpp
mkdir -p $(OUTDIR)
$(CXX) $(CXXFLAGS) -c -O3 $< -o $#
clean:
rm -rf $(OUTDIR)
.PHONY: clean
Result:
$ make
g++ -L cygdrive/e/boost/lib bin/test.o -o bin/prg -l boost_thread
c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: cannot find -lboost_thread
What's wrong? What should I specify?

Answer 1

In your Makefile the library search path is relative, but should be absolute in this case.
LNKFLAGS = -L/cygdrive/e/boost/lib
Check if /cygdrive/e/boost/lib really contains Boost libraries built with the GCC toolchain.
libboost_thread.a or libboost_thread.so will work.
Libraries built with the Visual C++ toolchain ending with .lib or .dll will not work.
Check if the filename matches.
-lboost_thread requires that the library is named either libboost_thread.a or libboost_thread.so.
libboost_thread-mt.a or the like will not work.
You may find my answer to a related question helpful.