What does the -O2 option for gcc do? [closed]

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What does the -O2 option for gcc do?

eg. gcc -O2 file1.c -o file1.o

asked Jun 28 at 2:12

CJ7

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closed as off-topic by slmâ™¦ Jun 28 at 2:50

This question appears to be off-topic. The users who voted to close gave this specific reason:

"Requests for learning materials (tutorials, how-tos etc.) are off topic. The only exception is questions about where to find official documentation (e.g. POSIX specifications). See the Help Center and our Community Meta for more information." â€“ slm

If this question can be reworded to fit the rules in the help center, please edit the question.

There's a detailed page at gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html, or run gcc -c -Q -O2 --help=optimizers
â€“Â Nick ODell
Jun 28 at 2:18

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up vote
-1
down vote

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What does the -O2 option for gcc do?

eg. gcc -O2 file1.c -o file1.o

asked Jun 28 at 2:12

CJ7

2171513

closed as off-topic by slmâ™¦ Jun 28 at 2:50

This question appears to be off-topic. The users who voted to close gave this specific reason:

"Requests for learning materials (tutorials, how-tos etc.) are off topic. The only exception is questions about where to find official documentation (e.g. POSIX specifications). See the Help Center and our Community Meta for more information." â€“ slm

If this question can be reworded to fit the rules in the help center, please edit the question.

There's a detailed page at gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html, or run gcc -c -Q -O2 --help=optimizers
â€“Â Nick ODell
Jun 28 at 2:18

add a commentÂ |Â

up vote
-1
down vote

favorite

What does the -O2 option for gcc do?

eg. gcc -O2 file1.c -o file1.o

asked Jun 28 at 2:12

CJ7

2171513

What does the -O2 option for gcc do?

eg. gcc -O2 file1.c -o file1.o

asked Jun 28 at 2:12

CJ7

2171513

asked Jun 28 at 2:12

CJ7

2171513

asked Jun 28 at 2:12

CJ7

2171513

asked Jun 28 at 2:12

CJ7

2171513

closed as off-topic by slmâ™¦ Jun 28 at 2:50

This question appears to be off-topic. The users who voted to close gave this specific reason:

"Requests for learning materials (tutorials, how-tos etc.) are off topic. The only exception is questions about where to find official documentation (e.g. POSIX specifications). See the Help Center and our Community Meta for more information." â€“ slm

If this question can be reworded to fit the rules in the help center, please edit the question.

closed as off-topic by slmâ™¦ Jun 28 at 2:50

This question appears to be off-topic. The users who voted to close gave this specific reason:

"Requests for learning materials (tutorials, how-tos etc.) are off topic. The only exception is questions about where to find official documentation (e.g. POSIX specifications). See the Help Center and our Community Meta for more information." â€“ slm

If this question can be reworded to fit the rules in the help center, please edit the question.

There's a detailed page at gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html, or run gcc -c -Q -O2 --help=optimizers
â€“Â Nick ODell
Jun 28 at 2:18

add a commentÂ |Â

There's a detailed page at gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html, or run gcc -c -Q -O2 --help=optimizers
â€“Â Nick ODell
Jun 28 at 2:18

There's a detailed page at gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html, or run gcc -c -Q -O2 --help=optimizers
â€“Â Nick ODell
Jun 28 at 2:18

add a commentÂ |Â

1 Answer
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The -O options turn on compiler optimization. From man gcc:

 -O2 Optimize even more. GCC performs nearly all supported
 optimizations that do not involve a space-speed tradeoff. As
 compared to -O, this option increases both compilation time and the
 performance of the generated code.

For a list of the specific optimizations, refer to the manual pages.

answered Jun 28 at 2:17

steeldriver

30.9k34877

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
0
down vote

accepted

The -O options turn on compiler optimization. From man gcc:

 -O2 Optimize even more. GCC performs nearly all supported
 optimizations that do not involve a space-speed tradeoff. As
 compared to -O, this option increases both compilation time and the
 performance of the generated code.

For a list of the specific optimizations, refer to the manual pages.

answered Jun 28 at 2:17

steeldriver

30.9k34877

add a commentÂ |Â

up vote
0
down vote

accepted

The -O options turn on compiler optimization. From man gcc:

 -O2 Optimize even more. GCC performs nearly all supported
 optimizations that do not involve a space-speed tradeoff. As
 compared to -O, this option increases both compilation time and the
 performance of the generated code.

For a list of the specific optimizations, refer to the manual pages.

answered Jun 28 at 2:17

steeldriver

30.9k34877

add a commentÂ |Â

up vote
0
down vote

accepted

The -O options turn on compiler optimization. From man gcc:

 -O2 Optimize even more. GCC performs nearly all supported
 optimizations that do not involve a space-speed tradeoff. As
 compared to -O, this option increases both compilation time and the
 performance of the generated code.

For a list of the specific optimizations, refer to the manual pages.

answered Jun 28 at 2:17

steeldriver

30.9k34877

The -O options turn on compiler optimization. From man gcc:

 -O2 Optimize even more. GCC performs nearly all supported
 optimizations that do not involve a space-speed tradeoff. As
 compared to -O, this option increases both compilation time and the
 performance of the generated code.

For a list of the specific optimizations, refer to the manual pages.

answered Jun 28 at 2:17

steeldriver

30.9k34877

answered Jun 28 at 2:17

steeldriver

30.9k34877

answered Jun 28 at 2:17

steeldriver

30.9k34877

answered Jun 28 at 2:17

steeldriver

30.9k34877

add a commentÂ |Â

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