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- gcc -Wall -std=c99 -pedantic -g sa.c -o sa -l m -l png
- In file included from /usr/include/pngconf.h:50:0,
- from /usr/include/png.h:366,
- from readpng.c:3,
- from sa.c:3:
- readpng.c: In function 'readpng_init':
- readpng.c:41:23: error: dereferencing pointer to incomplete type 'png_struct {aka struct png_struct_def}'
- if (setjmp(png_ptr->jmpbuf)) {
- ^
- sa.c: In function 'main':
- sa.c:6:14: warning: format '%p' expects argument of type 'void *', but argument 2 has type 'png_structp {aka struct png_struct_def *}' [-Wformat=]
- printf("%p\n", png_ptr);
- ~^
- make: *** [Makefile:6: sa] Error 1
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