I am trying to compile a c++ program on windows using GCC and a makefile.
I am getting the following error
c:\mingw\include\math.h: In function 'float hypotf(float, float)':
c:\mingw\include\math.h:635:30: error: '_hypot' was not declared in this scope
{ return (float)(_hypot (x, y)); }
I read that any file that includes on GCC needs the -lm linker flag. So I have added this to my makefile, but it did not rectify the problem...
Here is my makefile
CC := g++
CFLAGS := -std=c++0x -g -O2 -static-libgcc -static-libstdc++
LFLAGS := -lm
BIN_DIR := bin
BUILD_DIR := build
SRC_DIR := src
MAIN := MyFirstVstMain
TARGET := MyFirstVstMake
SOURCES := $(wildcard src/*.cpp)
OBJECTS := $(SOURCES:$(SRC_DIR)/%.cpp=$(BUILD_DIR)/%.o)
$(BIN_DIR)/$(TARGET): CREATE_DIRS $(BUILD_DIR)/$(MAIN).o $(OBJECTS)
$(CC) $(OBJECTS) $(CFLAGS) -o $@ $(LFLAGS)
$(BUILD_DIR)/$(MAIN).o: $(SRC_DIR)/MyFirstVstMain.cpp
$(CC) $(CFLAGS) -c -o $@ $< $(LFLAGS)
$(BUILD_DIR)/%.o: $(SRC_DIR)/%.cpp $(SRC_DIR)/%.h
$(CC) $(CFLAGS) -c -o $@ $< $(LFLAGS)
CREATE_DIRS:
if not exist $(BIN_DIR) mkdir $(BIN_DIR)
if not exist $(BUILD_DIR) mkdir $(BUILD_DIR)
CLEAN:
if exist $(BUILD_DIR) rmdir /Q /S $(BUILD_DIR)
This is a bug in MinGW, haven't found a fixed but using -D__NO_INLINE__ or editing math.h _hypot to hypot solved the issue, not the right fix but worked.
Other possible issue: You might have multiple MinGW versions installed, verify you're using the right one
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