我正在嘗試在 Swift 專案中使用 C 庫的示例。下面是參考鏈接
https://medium.com/bumble-tech/bundling-c-library-in-swift-framework-3d9dae950774
C 庫檔案鏈接 https://sourceforge.net/projects/giflib/files/
按照教程鏈接中的說明，解壓縮代碼并通過終端轉到檔案夾并使用 make 命令，它不起作用。我正在嘗試在 MAC os Big Sur 上執行此操作。下面是錯誤
**ABC-MacBook-Pro:giflib-5.2.1 abc$ make**
cc -std=gnu99 -fPIC -Wall -Wno-format-truncation -O2 -shared -Wl,-install_name -Wl,libutil.so.7 -o libutil.so qprintf.o quantize.o getarg.o
Undefined symbols for architecture x86_64:
"_GifErrorString", referenced from:
_PrintGifError in qprintf.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [libutil.so] Error 1
uj5u.com熱心網友回復：
改變
USOURCES = qprintf.c quantize.c getarg.c
對此
USOURCES = qprintf.c quantize.c getarg.c gif_err.c
里面Makefile。另外，更改這些行：
$(CC) $(CFLAGS) -shared $(LDFLAGS) -Wl,-soname -Wl,libgif.so.$(LIBMAJOR) -o libgif.so $(OBJECTS)
...
...
$(CC) $(CFLAGS) -shared $(LDFLAGS) -Wl,-soname -Wl,libutil.so.$(LIBMAJOR) -o libutil.so $(UOBJECTS)
到
$(CC) $(CFLAGS) -shared $(LDFLAGS) -Wl,-install_name -Wl,libgif.so.$(LIBMAJOR) -o libgif.so $(OBJECTS)
...
...
$(CC) $(CFLAGS) -shared $(LDFLAGS) -Wl,-install_name -Wl,libutil.so.$(LIBMAJOR) -o libutil.so $(UOBJECTS)
會做的作業
> make
cc -std=gnu99 -fPIC -Wall -Wno-format-truncation -O2 -c -o dgif_lib.o dgif_lib.c
warning: unknown warning option '-Wno-format-truncation' [-Wunknown-warning-option]
...
...
cc -std=gnu99 -fPIC -Wall -Wno-format-truncation -O2 gifwedge.c libgif.a libutil.a libgif.a -lm -o gifwedge
warning: unknown warning option '-Wno-format-truncation' [-Wunknown-warning-option]
1 warning generated.
要跳過xmlto執行，請洗掉
# $(MAKE) -C doc
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