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Previously I was receiving warnings from gcc -std=c99 that usleep() was implicitly declared. Then I stumbled across this stackoverflow postthis stackoverflow post, which led me to use -D_BSD_SOURCE. However, now gcc tells me that -D_BSD_SOURCE has been deprecated and I should use -D_DEFAULT_SOURCE instead.

#warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"

Why is -D_BSD_SOURCE deprecated? Why is -D_DEFAULT_SOURCE used instead? And what does it do?

I did some googling, and the results are just filled with people using it to shut gcc up. I couldn't find out why -D_BSD_SOURCE has been deprecated, just that it is.

Previously I was receiving warnings from gcc -std=c99 that usleep() was implicitly declared. Then I stumbled across this stackoverflow post, which led me to use -D_BSD_SOURCE. However, now gcc tells me that -D_BSD_SOURCE has been deprecated and I should use -D_DEFAULT_SOURCE instead.

#warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"

Why is -D_BSD_SOURCE deprecated? Why is -D_DEFAULT_SOURCE used instead? And what does it do?

I did some googling, and the results are just filled with people using it to shut gcc up. I couldn't find out why -D_BSD_SOURCE has been deprecated, just that it is.

Previously I was receiving warnings from gcc -std=c99 that usleep() was implicitly declared. Then I stumbled across this stackoverflow post, which led me to use -D_BSD_SOURCE. However, now gcc tells me that -D_BSD_SOURCE has been deprecated and I should use -D_DEFAULT_SOURCE instead.

#warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"

Why is -D_BSD_SOURCE deprecated? Why is -D_DEFAULT_SOURCE used instead? And what does it do?

I did some googling, and the results are just filled with people using it to shut gcc up. I couldn't find out why -D_BSD_SOURCE has been deprecated, just that it is.

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ryanmjacobs
ryanmjacobs
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What does -D_DEFAULT_SOURCE do?

Previously I was receiving warnings from gcc -std=c99 that usleep() was implicitly declared. Then I stumbled across this stackoverflow post, which led me to use -D_BSD_SOURCE. However, now gcc tells me that -D_BSD_SOURCE has been deprecated and I should use -D_DEFAULT_SOURCE instead.

#warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"

Why is -D_BSD_SOURCE deprecated? Why is -D_DEFAULT_SOURCE used instead? And what does it do?

I did some googling, and the results are just filled with people using it to shut gcc up. I couldn't find out why -D_BSD_SOURCE has been deprecated, just that it is.