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Makefile无法正常工作 #1

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wurui1994 opened this issue Nov 6, 2017 · 4 comments · May be fixed by #2
Open

Makefile无法正常工作 #1

wurui1994 opened this issue Nov 6, 2017 · 4 comments · May be fixed by #2

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@wurui1994
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在Manjaro上会报错：
[wurui@computer light2d]$ make
cc basic.c -o basic
/tmp/ccb1Fj9Q.o：在函数‘circleSDF’中：
basic.c:(.text+0x104e)：对‘sqrtf’未定义的引用
/tmp/ccb1Fj9Q.o：在函数‘sample’中：
basic.c:(.text+0x1189)：对‘sinf’未定义的引用
basic.c:(.text+0x119e)：对‘cosf’未定义的引用
/tmp/ccb1Fj9Q.o：在函数‘main’中：
basic.c:(.text+0x1264)：对‘fminf’未定义的引用
collect2: 错误：ld 返回 1
make: *** [<内置>：basic] 错误 1

必须要改成这样，才能正常工作：
TARGETS=basic csg
OUTPUTS=$(addsuffix .png, $(TARGETS))

all: $(TARGETS)
test: $(TARGETS) $(OUTPUTS)

%: %.c
gcc -lm -Wall -O3 -o $@ $&lt;

%.png: %
sh -c "time ./$<"

clean:
rm $(TARGETS) *.png
@leinlin
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leinlin commented Nov 10, 2017

用Unity 把算法 依葫芦画瓢的搞了一个下来，makefile文盲可以来试试看
https://github.com/ElPsyCongree/light2d_for_unity

@miloyip
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miloyip commented Nov 11, 2017

@wurui1994 感觉这是平台的问题。例子代码都只使用了 C99 标准库。

@kimci86
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kimci86 commented Nov 27, 2017 •
edited
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I had a similar issue because of a small mistake in the makefile : %.: %.c should be %: %.c (notice the dot). Then I had to add the -lm flag for gcc.

@micfan
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micfan commented Mar 27, 2019

gcc (GCC) 8.2.1 20181127 compile error, how to solve it?

gcc -Wall -O3 -o csg csg.c
/usr/bin/ld: /tmp/ccv6tJMs.o: in function `circleSDF':
csg.c:(.text+0xa1a): undefined reference to `sqrtf'
/usr/bin/ld: /tmp/ccv6tJMs.o: in function `scene':
csg.c:(.text+0xc03): undefined reference to `sqrtf'
/usr/bin/ld: csg.c:(.text+0xc30): undefined reference to `sqrtf'
/usr/bin/ld: /tmp/ccv6tJMs.o: in function `trace':
csg.c:(.text+0xd8b): undefined reference to `sqrtf'
/usr/bin/ld: csg.c:(.text+0xe2d): undefined reference to `sqrtf'
/usr/bin/ld: /tmp/ccv6tJMs.o: in function `sample':
csg.c:(.text+0xf0d): undefined reference to `sincosf'
/usr/bin/ld: csg.c:(.text+0x1053): undefined reference to `sqrtf'
/usr/bin/ld: csg.c:(.text+0x10a6): undefined reference to `sqrtf'
/usr/bin/ld: /tmp/ccv6tJMs.o: in function `main':
csg.c:(.text.startup+0x63): undefined reference to `fminf'
collect2: error: ld returned 1 exit status
make: *** [makefile:11: csg] Error 1

@micfan micfan linked a pull request Mar 27, 2019 that will close this issue
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fix gcc link error of math library
5 participants
@miloyip @kimci86 @micfan @wurui1994 @leinlin