[LIBTOMMATH] The static build library can not be included in a shared library in LINUX

[atopavirgil]

https://github.com/libtom/libtommath

The library build with VCPKG in Linux x64 can be included and works in another static library (as static library).
However if we try to create a shared library (which includes libtommath) we get this message:

libtommath.a(bn_mp_mul.o): relocation R_X86_64_PC32 against symbol `KARATSUBA_MUL_CUTOFF' can not be used when making a shared object; recompile with -fPIC

I suppose somwhere in the port the option must be included.

Triplet used:

set(VCPKG_TARGET_ARCHITECTURE x64)
set(VCPKG_CRT_LINKAGE dynamic)
set(VCPKG_LIBRARY_LINKAGE dynamic)
set(VCPKG_CMAKE_SYSTEM_NAME Linux)

During the build using this triplet both static and dynamic libraries are created for libtommath but the program links with the static one.

[atopavirgil]

This is not a community-triplet issue (it may be for Android for which I added a sepparate issue). The main problem described here is that Building in Linux x64 which is an official supported configuration (not community) require changes in the PORT file ( adding -fPIC parameter). The sister library libtomcrypt has this parameter in port, libtommath it does not.
The Android problem may be different.

[LilyWangLL]

This is not a community-triplet issue (it may be for Android for which I added a sepparate issue). The main problem described here is that Building in Linux x64 which is an official supported configuration (not community) require changes in the PORT file ( adding -fPIC parameter). The sister library libtomcrypt has this parameter in port, libtommath it does not. The Android problem may be different.

I will repro this issue locally and confirm it soon.

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[LilyWangLL]

See the comment libtom/libtommath#523 (comment), this issue still exists when recompile with -fPIC.

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