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.)

2015-11-30, 864👍, 0💬

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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, 957👍, 0💬

I am appalled that the ANSI Standard leaves so many issues undefined ...
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Does anyone have a tool for converting old-style C programs to ANSI C?
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What was noalias and what ever happened to it?
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Wy compiler is rejecting the simplest possible test programs ...
My compiler is rejecting the simplest possible test programs, with all kinds of syntax errors. It's complaining about the first line of main(int argc, char **argv) { return 0; } Perhaps it is a pre-ANSI compiler, unable to accept function prototypes and the like. If you don't have access to an ANSI ... 2015-12-02, 925👍, 0💬

What does the message Automatic aggregate intialization is an ANSI feature mean?
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People seem to make a point of distinguishing between ...
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