![]() I #include that header in every source file that calls a _delay_xx() function. "Normally" I put the _XTAL_FREQ definition in a header somewhere in my project. It's just there to prove that it doesn't matter where _XTAL_FREQ is defined with respect to inclusion of. More often than not, the problem is in what the OP does NOT mention in their first post.Äave Footnote: That #ifdef stuff is not (that's NOT) part of a "normal" program. You might think that's what the problem is while it could be something else.Äitto. #Implicit declaration of function fullIf possible Post your entire code and the full error message. qhb Please show your entire code then, there's something else wrong. Works a treat with XC8 version 2.00 and 2.05 in C99 mode. _delay_ms(100) // Give things a little time to settle down I really want to understand what is wrong so i wont do that again in the future. Make sure none of the previous stuff has sneakily defined _XTAL_FREQ c - warning: implicit declaration of function printf. Global and extern variables and function dececlarations go here or ![]() Config pragmas can go here or in their own separate. From Main.c in my test code example: (See Footnote) Im getting an error message 'implicit declaration of function atoi is not valid in C99' when trying to use atoi (), even though Ive included in my header.This is how you call a function: fix-gcc-error-implicit-declaration-of-function. In our example above, StartBenchmark is the function that is implicitly declared. That should NOT usually be hard-coded, but in this case the linux-headers-4.5.0 package contains a build artefact 'include/linux/version.h' that specifies a very old kernel version. The code is conditionally compiled based on the value of LINUXVERSIONCODE. Has nothing to do with where _XTAL_FREQ is #defined with respect to the place (or anything else) is #included. implicit declaration of function means that you are trying to use a function that has not been declared. error: implicit declaration of function âdaemonizeâ This is difficult to diagnose. In other words, _XTAL_FREQ must be defined ( and visible) at the place where the functions are used. (Have you tried it?) The definitions for the _delay_xx() functions (macros, actually) are such that they depend on _XTAL_FREQ being #defined before the functions are used. Maybe some might think it's worth a try, but doesn't help. JPortici it needs to be before the include, because when the preprocessor includes the XC file, XTAL FREQ is still not defined, so the delay functions are not included. (Have you tried it?) Definitions and usage requirements for the _delay_xx() routines are same for C90 and C99 mode. Du00000001 The easy way: switch to C90 mode ! Maybe some might think it's worth a try, but makes no difference. C Programming - Error Implicit Declaration Of Function Solution This is done in Eclipse00:00 C Language Codinglimjetweelimjetweeeclipsecprogrammingprogra. ![]()
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