CODEWITHSUNDEEP
cgccoptimization
Polb
Polb

Reputation: 700

How to optimize the executable generated by a C compilation in Linux terminal

Is there any way to reduce the memory used by an executable generated with a command like gcc source_file.c -o result? I browsed the Internet and also looked in the man page for "gcc" and I think that I should use something related to -c or -S. So is gcc -c -S source_file.c -o result working? (This seems to reduce the space used...is there any other way to reduce even more?)

Thanks, Polb

Upvotes: 0

Views: 1030

Answers (2)

user1415926535897
user1415926535897

Reputation: 106

option -S generate assembler output. Better option is using llvm and generating asembler for multi architecture. Similar http://kripken.github.io/llvm.js/demo.html

llc

here is example https://idea.popcount.org/2013-07-24-ir-is-better-than-assembly/

Upvotes: -3

fuz
fuz

Reputation: 93162

The standard compiler option on POSIX-like systems to instruct the compiler to optimize is -O (capital letter O for optimize). Many compilers allow you to optionally specify an optimization level after -O. Common optimization levels include:

  • -O0 no optimization at all
  • -O1 basic optimization for speed
  • -O2 all of -O1 plus some advanced optimizations
  • -O3 all of -O2 plus expensive optimizations that aren't usually needed
  • -Os optimize for size instead of speed (gcc, clang)
  • -Oz optimize even more for size (clang)
  • -Og all of -O2 except for optimizations that hinder debugging (gcc)
  • -Ofast all of -O3 and some numeric optimizations not in conformance with standard C. Use with caution. (gcc)

Upvotes: 4

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