[BUG] Build fails in Ubuntu 20.04 using gcc 13.2.0

[codeapparat]

Describe the bug
Can't compile btop under Ubuntu 20.04, using g++ 13.2.0,
it fails at linking time. When typing make I get:

PLATFORM ?| Linux
ARCH ?| x86_64
GPU_SUPPORT :| true
CXX ?| /opt/gcc-13.2.0/bin/g++ (13.2.0)
THREADS :| 6
REQFLAGS !| -std=c++20
WARNFLAGS :| -Wall -Wextra -pedantic
OPTFLAGS :| -O2 -ftree-vectorize -flto=6
LDCXXFLAGS :| -pthread -DFMT_HEADER_ONLY -D_GLIBCXX_ASSERTIONS -D_FILE_OFFSET_BITS=64 -fexceptions -fstack-clash-protection -fcf-protection -fstack-protector -DGPU_SUPPORT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3
CXXFLAGS +| $(REQFLAGS) $(LDCXXFLAGS) $(OPTFLAGS) $(WARNFLAGS)
LDFLAGS +| $(LDCXXFLAGS) $(OPTFLAGS) $(WARNFLAGS)

Building btop++ (v1.3.2) Linux x86_64
Command 'lowdown' not found: skipping generating man page btop.1
...
Configuring obj/config.h
Compiling src/btop.cpp
Compiling src/btop_menu.cpp
Compiling src/btop_input.cpp
Compiling src/btop_shared.cpp
Compiling src/btop_draw.cpp
...
Linking and optimizing binary...
/usr/bin/ld: /tmp/ccj2IUfF.ltrans17.ltrans.o: in function Shared::init()': <artificial>:(.text+0x5cf7): undefined reference to dlopen'
/usr/bin/ld: :(.text+0x5d12): undefined reference to dlopen' /usr/bin/ld: <artificial>:(.text+0x611b): undefined reference to dlerror'
/usr/bin/ld: /tmp/ccj2IUfF.ltrans23.ltrans.o: in function Gpu::Rsmi::init()::{lambda(char const*)#1}::operator()(char const*) const [clone .isra.0]': <artificial>:(.text+0x19): undefined reference to dlsym'
/usr/bin/ld: :(.text+0x21): undefined reference to dlerror' /usr/bin/ld: /tmp/ccj2IUfF.ltrans23.ltrans.o: in function Gpu::Nvml::init()::{lambda(char const*)#1}::operator()(char const*) const [clone .isra.0]':
:(.text+0x4a4d): undefined reference to dlsym' /usr/bin/ld: <artificial>:(.text+0x4a55): undefined reference to dlerror'
/usr/bin/ld: /tmp/ccj2IUfF.ltrans23.ltrans.o: in function Gpu::Rsmi::init() [clone .isra.0]': <artificial>:(.text+0x4c50): undefined reference to dlopen'
/usr/bin/ld: :(.text+0x4c6a): undefined reference to dlerror' /usr/bin/ld: /tmp/ccj2IUfF.ltrans23.ltrans.o: in function Gpu::Nvml::shutdown() [clone .isra.0]':
:(.text+0x4974): undefined reference to dlclose' /usr/bin/ld: /tmp/ccj2IUfF.ltrans23.ltrans.o: in function Gpu::Rsmi::shutdown() [clone .isra.0]':
:(.text+0x4bcc): undefined reference to `dlclose'
collect2: error: ld returned 1 exit status
make: *** [Makefile:383: btop] Error 1

To Reproduce
Ubuntu 20.04, compile gcc 13.2.0 and set CXX to the new g++ binary.

git clone https://github.com/aristocratos/btop.git
cd btop
make CXX=/opt/gcc-13.2.0/bin/g++

Expected behavior
btop binary gets created after make

Info (please complete the following information):

• btop++ version: 1.3.2 (from git)
• Architecture: x86_64
• Platform: Ubuntu 20.04
• Linux Kernel: 5.8.0-63-generic

Thank you very much, for this amazing tool!

[imwints]

Read the README.md and search for similar issues before posting a bug report!

Duplicate of #704 #725 #730

Please upgrade to a newer version of your distro.

[alalazo]

@imwints Maybe getting four duplicates of the same issue means the use case is not as unusual as was initially thought?

[arubin]

For reference, I solved this issue by adding the line:
target_link_libraries(btop dl)
To the linking section towards the end of CMakeLists.txt

[alalazo]

@arubin See #725 😉