发文件问题？
为什么当我使用我的makefile编译我的程序时，我获得了：
gcc -Wall -pedantic src/main.c -o _wk/main.o src/main.c:9:11: warning: C++ style comments are not allowed in ISO C90 src/main.c:9:11: warning: (this will be reported only once per input file) src/main.c: In function 'initialiseStructItimerval': src/main.c:46: warning: format '%d' expects type 'int', but argument 2 has type '__suseconds_t' src/main.c: In function 'stockeRetard': src/main.c:71: warning: ISO C90 forbids mixed declarations and code src/main.c: In function 'main': src/main.c:141: warning: ISO C90 forbids mixed declarations and code src/main.c:139: warning: unused variable 'i' Debut de l'edition des liens... cd _wk ; gcc -o ../test main.o main.o: In function `_start': (.text+0x0): multiple definition of `_start' /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 0 has invalid symbol index 12 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 1 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 2 has invalid symbol index 2 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 3 has invalid symbol index 2 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 4 has invalid symbol index 12 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 5 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 6 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 7 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 8 has invalid symbol index 2 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 9 has invalid symbol index 2 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 10 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 11 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 12 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 13 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 14 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 15 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 16 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 17 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 18 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 19 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 20 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 21 has invalid symbol index 14 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 22 has invalid symbol index 22 /usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_line): relocation 0 has invalid symbol index 2 /usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:/build/buildd/eglibc-2.11.1/csu/../sysdeps/i386/elf/start.S:119: first defined here main.o:(.rodata+0x0): multiple definition of `_fp_hw' /usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.rodata+0x0): first defined here main.o: In function `_fini': (.fini+0x0): multiple definition of `_fini' /usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crti.o:(.fini+0x0): first defined here main.o:(.rodata+0x4): multiple definition of `_IO_stdin_used' /usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.rodata.cst4+0x0): first defined here main.o: In function `__data_start': (.data+0x0): multiple definition of `__data_start' /usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.data+0x0): first defined here main.o: In function `__data_start': (.data+0x4): multiple definition of `__dso_handle' /usr/lib/gcc/i486-linux-gnu/4.4.3/crtbegin.o:(.data+0x0): first defined here main.o: In function `_init': (.init+0x0): multiple definition of `_init' /usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crti.o:(.init+0x0): first defined here /usr/lib/gcc/i486-linux-gnu/4.4.3/crtend.o:(.dtors+0x0): multiple definition of `__DTOR_END__' main.o:(.dtors+0x4): first defined here collect2: ld returned 1 exit status make: *** [all] Erreur 1 我的makefile是这样的：
CC=gcc LD=gcc C_FLAGS= -Wall -pedantic #Dossier de workarea pour la generation RWK=_wk #Liste des dossier dans lesquels effectuer la recherche ordonnee DIRS= \ src \ bin \ $(RWK) #Definition de la liste des sources C a compiler SRC_C=$(shell (for src in $$(find . -type f -name *.c) ; do basename $$src ; done)) #Liste des fichiers objets C_OBJS=$(SRC_C:.c=.o) vpath %.c $(DIRS) #Regle principale all: init_wk $(C_OBJS) @echo "Debut de l'edition des liens..." cd $(RWK) ; $(LD) -o test $(C_OBJS) @echo "Compilation terminee." #Regle de generation des fichier c->o %.o : %.c @echo "Compilation des .c : $<" $(CC) $(C_FLAGS) $< -o $(RWK)/$@ #Regle a appeler pour le nettoyage de RWK clean: @echo "Nettoyage du dossier de travail" @if [ -d $(RWK) ] ; then rm -rf $(RWK) ; fi #Regle d'initialisation de la workarea init_wk: clean @echo "Creation du dossier de travail..." @mkdir $(RWK) @if [ -e ./out ]; then echo "Existe deja"; else mkdir ./out; fi
但是，当我尝试使用这样的简单makefile并且没有包含文件夹时，我没有错误：
CC=gcc LD=gcc BIN = hello SRCS=$(wildcard *.c) OBJS = $(SRCS:.c=.o) DEPS = $(SRCS:.c=.d) CFLAGS = -W -Wall -pedantic all: $(BIN) $(BIN): $(OBJS) $(LD) -o $@ $(OBJS) %.o: %.c $(CC) -o $@ -c $< $(CFLAGS) %.d: %.c $(CC) $(CFLAGS) -MM -MD -o $@ $< -include $(DEPS) .PHONY: clean distclean clean: rm -rf $(OBJS)
对不起这篇长篇文章，但我不明白我的错误：/
仅编译单个模块（不链接它们）时，添加-c作为编译器参数，以防止它每次都链接c / c ++运行时。
如果您想获取可执行文件或库文件，请不要添加-c 。 如果您想获得.o文件，请添加-c 。
%.o : %.c @echo "Compilation des .c : $<" $(CC) $(C_FLAGS) $< -o $(RWK)/$@
这里有一个问题：没有-c选项，gcc将编译和链接 。 试试这个：
$(CC) $(C_FLAGS) -c $< -o $(RWK)/$@
此外， $(CFLAGS)比$(C_FLAGS)更常见
我有同样的问题。 我已经删除了我的主要function。 你可能会检查你的是否还在那里。