long double functions stubs

[alexkalmuk]

Are there stubs of functions that operate with long double types like roundl(), sinl() and so on? I can not find it. I found such stubs in glibc and newlib, hence I wonder shouldn't OpenLibm provide these stubs for the platforms which have long double equal to double type if the check below failed?

openlibm/src/Make.files

Lines 46 to 47 in f052f42

	# Add in long double functions for x86, x64 and aarch64
	ifeq ($(LONG_DOUBLE_NOT_DOUBLE),1)

[lephe]

I was looking for this – a bit late but I hope it helps. When long double is double (aka. 64-bit floating-point), the files in src define aliases. For instance, src/s_nan.c has:

#if (LDBL_MANT_DIG == 53)
openlibm_weak_reference(nan, nanl);
#endif

The mechanism used for weak references is defined in src/cdefs-compat.h, as you'd expect it varies heavily depending on the OS and compiler.

You can check that the weak symbol is indeed there by running objdump -t (or readelf, or any other tool) on a relevant object file.

% objdump -t src/s_nan.c.o

src/s_nan.c.o:     file format elf32-big

SYMBOL TABLE:
...
000000fc  w    F .text	0000003c _nanl
000000fc g     F .text	0000003c _nan
...
00000138 g     F .text	00000034 _nanf

It can be missing if the weak reference mechanism doesn't work (this was the case for me, since on my architecture there are underscores before symbol names and src/cdefs-compat.h didn't account for it).