How to fix this warning messages at compilation on AS400 (C program)?

Question

On iSeries (AS400), in a developer environment, when I compile a C or C++ program (under qsh , using gmake and ixlc / not CRTPGM )

ixlc -c mySource.c

Each time <math.h> is used in a source code, pops this series of warnings:

/QIBM/include/math.h Line 000195 The floating point literal "1.1754943508222875E-38F" is out of range.

/QIBM/include/math.h Line 000208 The floating point literal "1.1754943508222875E-38F" is out of range.

/QIBM/include/math.h Line 000217 The floating point literal "1.1754943508222875E-38F" is out of range.

... plus 10 more

Which corresponds to any line using FLT_MIN , a defined const, from /QIBM/include/float.h .

#define FLT_MIN               1.1754943508222875E-38F

But how can I avoid this warning message which floods my compilation logs.

Answer 1

The defined value for FLT_MIN in your header file has 16 decimal digits. Which is way too much.

This system uses IEEE 754 . So single-precision float values can only have up to 7 decimal digits. (And double-precision value can have 15). The compiler seems to know, but not the std sources.

Fix the code in the library.

Take example on other implementations of the std , the code in the library should be:

#define FLT_EPSILON     1.192093e-07
#define FLT_MIN         1.175494e-38
#define FLT_MAX         3.402823e+38

Since this ILE source is protected on iSeries, maybe choose to redirect the symbolic link from /QIBM/include/float.h to another source code of your creation. Not necessarily a member, but an IFS file should do the job.