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Re: math.h, copysign, visibility defines

Joerg Sonnenberger <> writes:

> Am Thu, Feb 24, 2022 at 07:59:22AM -0500 schrieb Greg Troxel:
>> I'm trying to build wip/ocaml on NetBSD 9 amd64 and came across:
>>   gcc -c -O2 -fno-strict-aliasing -fwrapv  -pthread  -Wall -Wdeclaration-after-statement -Werror -fno-common -fexcess-precision=standard -fno-tree-vrp -fPIC -ffunction-sections -g -O2 -fPIC -D_FORTIFY_SOURCE=2 -I/usr/include -D_FILE_OFFSET_BITS=64 -DCAML_NAME_SPACE  -DCAMLDLLIMPORT= -I/usr/include -o floats.b.o floats.c
>>   floats.c: In function 'caml_copysign':
>>   floats.c:1074:10: error: implicit declaration of function 'copysign' [-Werror=implicit-function-declaration]
>>      return copysign(x, y);
>>             ^~~~~~~~
>>   floats.c:1074:10: error: incompatible implicit declaration of built-in function 'copysign' [-Werror]
>>   floats.c:1074:10: note: include '<math.h>' or provide a declaration of 'copysign'
>>   cc1: all warnings being treated as errors
>>   gmake[2]: *** [Makefile:366: floats.b.o] Error 1
> This was fixed in current almost exactly two years ago.

And apparently not fixed in the releaase branch, which is what we expect
most people to run :-)

Do you think it's wise to pullup of src/include/math.h 1.65-1.66?  If
so, could you request it (since you obviously understand these details
better than I do)?

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