Question

再次遇到makefile中的库问题。每当我尝试回到C时，make都会给你带来libs的痛苦。

make -pf /dev/null表示正确的变量应为LDLIBS和LOADLIBES，但以下内容根本不会改变运行命令：

LOADLIBES=testing
LDFLAGS=testing
LDLIBS=testing

毋庸置疑，这会给我带来错误，因为-L标志不会在命令中结束。有谁知道发生了什么事？

下面的完整makefile（Z Shaw的makefile的Derivitave）

OPTLIBS=$(xml2-config --libs)
OPTFLAGS=$(xml2-config --cflags)

STD=c99
CFLAGS=-std=$(STD) -g -O2 -Wall -Wextra -Isrc -rdynamic -DNDEBUG $(OPTFLAGS)
LDLIBS=-ldl $(OPTLIBS)
PREFIX?=/usr/local



SOURCES=$(wildcard src/**/*.c src/*.c)
OBJECTS=$(patsubst %.c,%.o,$(SOURCES))

TEST_SRC=$(wildcard tests/*_tests.c)
TESTS=$(patsubst %.c,%,$(TEST_SRC))

TARGET=build/lib.a
SO_TARGET=$(patsubst %.a,%.so,$(TARGET))

# The Target Build
all: cls $(TARGET) $(SO_TARGET) tests

dev: CFLAGS=-std=$(STD) -g -Wall -Isrc -Wall -Wextra $(OPTFLAGS)
dev: all

$(TARGET): CFLAGS += -fPIC
$(TARGET): build $(OBJECTS)
    ar rcs $@ $(OBJECTS)
    ranlib $@

$(SO_TARGET): $(TARGET) $(OBJECTS)
    $(CC) -shared -o $@ $(OBJECTS)

build:
    @mkdir -p build
    @mkdir -p bin

# The Unit Tests
$(TESTS): $(TARGET)

.PHONY: tests
tests: LDLIBS += $(TARGET)
tests: $(TESTS)
    sh ./tests/runtests.sh

valgrind:
    VALGRIND="valgrind --log-file=/tmp/valgrind-%p.log" $(MAKE)

# The Cleaner
clean: cls
    rm -rf build $(OBJECTS) $(TESTS)
    rm -f tests/tests.log
    find . -name "*.gc*" -exec rm {} \;
    rm -rf `find . -name "*.dSYM" -print`

# The Install
install: all
    install -d $(DESTDIR)/$(PREFIX)/lib/
    install $(TARGET) $(DESTDIR)/$(PREFIX)/lib/

# The Checker
BADFUNCS='[^_.>a-zA-Z0-9](str(n?cpy|n?cat|xfrm|n?dup|str|pbrk|tok|_)|stpn?cpy|a?sn?printf|byte_)'
check:
    @echo Files with potentially dangerous functions.
    @egrep $(BADFUNCS) $(SOURCES) || true

# Clear screen for unspammy terminals
cls:
ifdef TERM
    clear
endif

Answer 1

您在链接命令中没有使用LDFLAGS等。按照以下方式做点什么：

$(SO_TARGET): $(TARGET) $(OBJECTS)
    $(CC) -shared $(LDFLAGS) -o $@ $(OBJECTS) $(LDLIBS)

什么是makefile的正确lib变量？

1 个答案: