I'm porting a piece of C code which uses math functions like floorf(), powf(), expf(), logf(), roundf() etc. I don't see these declared anywhere in our SDK - so how would I best go about compiling the code? Any tips appreciated!
Thu, 2018-02-22 00:06
#1
Missing C math functions (solved)
Just a silly answer:
Did you add/include "math.h"?
#gcc foo.c -o bar -gstabs -Wall
#bar
1.100000 2.200000 1.210000
#
AOS4.1/SAM460ex/PPC460EX-1155MHZ/2048MB/RadeonRX550/SSD240GB/DVDRW :-P
@trixie
Not sure, but if you're using a makefile with seperate compile and link stages, you might also need to add "-lm" to the link stage. I don't know how much precision you need but if you look in math.h there are also double precision versions of most functions.
X1000 - OS 4.1FE
Newlib should have all those functions. Just make sure that you have "#include <math.h>" in the source file where you want to use them.
@all
The source code did include math.h (that was the first thing I checked) but GCC still complained about an "incompatible implicit declaration of built-in function". I solved the problem by #undef-ining __STRICT_ANSI__ (I didn't realize that the -std=c99 compiler switch in the provided makefile defined this macro automatically).
AmigaOne X5000-020 / 2GB RAM / Sapphire Pulse Radeon RX 560 / AmigaOS 4.1 Final Edition Update 2
You should use -std=gnu99 instead of -std=c99 if you don't want __STRICT_ANSI__.
The __STRICT_ANSI__ define makes newlib disable all clib functions that aren't standard ANSI.
@salass00
Good tip, thank you!
AmigaOne X5000-020 / 2GB RAM / Sapphire Pulse Radeon RX 560 / AmigaOS 4.1 Final Edition Update 2