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Our professor in a lecture example compiled his code with a kind of options/args like this: gcc -O3 -DDOUBLE -lm -o outputfil inputfile.c. I researched and I found out that -O3 is a kind of level 3 optimization the compiler does to the code, but I couldn't find any info about the left options (-lm & -DDOUBLE).

ILoveWLMEmoticons
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  • See the manual: [gcc preprocessor options](https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html#Preprocessor-Options) and [gcc link options](https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html#Link-Options). – kaylum Apr 06 '21 at 02:15
  • This question can be closed as a combination duplicate of https://stackoverflow.com/questions/1033898 and https://stackoverflow.com/questions/26226874 – cigien Apr 06 '21 at 02:17

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