Why are some ANSI ISO Standard library functions showing you

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Why are some ANSI/ISO Standard library functions showing up as undefined, even though I've got an ANSI compiler?

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It's possible to have a compiler available which accepts ANSI syntax, but not to have ANSI-compatible header files or run-time libraries installed. (In fact, this situation is rather common when using a non-vendor-supplied compiler such as gcc.)

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Wy compiler is rejecting the simplest possible test programs ...
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What does the message Automatic aggregate intialization is an ANSI feature mean?
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What does it really mean for a program to be legal or `valid or ``conforming?
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What should malloc0 do? Return a null pointer or a pointer to 0 bytes?
What should malloc0 do? Return a null pointer or a pointer to 0 bytes? The ANSI/ISO Standard says that it may do either; the behavior is implementation-defined Portable code must either take care not to call malloc(0), or be prepared for the possibility of a null return. 2015-12-04, 1607👍, 0💬

Why are some ANSI ISO Standard library functions showing you
Why are some ANSI/ISO Standard library functions showing up as undefined, even though I've got an ANSI compiler? It's possible to have a compiler available which accepts ANSI syntax, but not to have ANSI-compatible header files or run-time libraries installed. (In fact, this situation is rather comm... 2015-11-30, 1602👍, 0💬

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