G++ libaries

[Vagous]

How do I get g++ to recognize a library i’ve installed with pacman?

[Vagous]

System:
Kernel: 6.8.1-zen1-1-zen arch: x86_64 bits: 64 compiler: gcc v: 13.2.1
clocksource: tsc avail: hpet,acpi_pm
parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux-zen
root=UUID=4aac3ebc-374d-4e7c-9d1b-629c23010d90 rw rootflags=subvol=@
quiet loglevel=3 ibt=off
Desktop: KDE Plasma v: 6.0.2 tk: Qt v: N/A info: frameworks v: 6.0.0
wm: kwin_wayland vt: 1 dm: SDDM Distro: Garuda base: Arch Linux
Machine:
Type: Desktop System: Gigabyte product: B550 AORUS ELITE v: N/A
serial: <superuser required>
Mobo: Gigabyte model: B550 AORUS ELITE v: x.x serial: <superuser required>
uuid: <superuser required> BIOS: American Megatrends v: F10 date: 09/18/2020
CPU:
Info: model: AMD Ryzen 7 3700X bits: 64 type: MT MCP arch: Zen 2 gen: 3
level: v3 note: check built: 2020-22 process: TSMC n7 (7nm)
family: 0x17 (23) model-id: 0x71 (113) stepping: 0 microcode: 0x8701021
Topology: cpus: 1x cores: 8 tpc: 2 threads: 16 smt: enabled cache:
L1: 512 KiB desc: d-8x32 KiB; i-8x32 KiB L2: 4 MiB desc: 8x512 KiB
L3: 32 MiB desc: 2x16 MiB
Speed (MHz): avg: 3641 high: 4286 min/max: 2200/4426 boost: enabled
scaling: driver: acpi-cpufreq governor: performance cores: 1: 3600 2: 3600
3: 3600 4: 3600 5: 3600 6: 3600 7: 3600 8: 3600 9: 3600 10: 3600 11: 3582
12: 3600 13: 3600 14: 3600 15: 4286 16: 3600 bogomips: 114989
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
Vulnerabilities: <filter>
Graphics:
Device-1: NVIDIA TU104 [GeForce RTX 2070 SUPER] vendor: eVga.com.
driver: nvidia v: 550.54.14 alternate: nouveau,nvidia_drm non-free: 545.xx+
status: current (as of 2024-02; EOL~2026-12-xx) arch: Turing code: TUxxx
process: TSMC 12nm FF built: 2018-2022 pcie: gen: 1 speed: 2.5 GT/s
lanes: 16 link-max: gen: 3 speed: 8 GT/s ports: active: none off: DP-3
empty: DP-1, DP-2, HDMI-A-1, Unknown-2 bus-ID: 0a:00.0 chip-ID: 10de:1e84
class-ID: 0300
Display: wayland server: X.org v: 1.21.1.11 with: Xwayland v: 23.2.4
compositor: kwin_wayland driver: X: loaded: nvidia
unloaded: modesetting,nouveau alternate: fbdev,nv,vesa gpu: nvidia
display-ID: 0
Monitor-1: DP-3 res: 1920x1080 size: N/A modes: N/A
API: EGL v: 1.5 hw: drv: nvidia platforms: device: 0 drv: nvidia device: 2
drv: swrast gbm: drv: nvidia surfaceless: drv: nvidia wayland: drv: nvidia
x11: drv: zink inactive: device-1
API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 550.54.14
glx-v: 1.4 direct-render: yes renderer: NVIDIA GeForce RTX 2070
SUPER/PCIe/SSE2 memory: 7.81 GiB display-ID: :1.0
API: Vulkan v: 1.3.279 layers: 15 device: 0 type: discrete-gpu name: NVIDIA
GeForce RTX 2070 SUPER driver: nvidia v: 550.54.14 device-ID: 10de:1e84
surfaces: xcb,xlib,wayland device: 1 type: discrete-gpu name: NVIDIA
GeForce RTX 2070 SUPER driver: nvidia v: 550.54.14 device-ID: 10de:1e84
surfaces: xcb,xlib,wayland device: 2 type: cpu name: llvmpipe (LLVM
17.0.6 256 bits) driver: mesa llvmpipe v: 24.0.3-arch1.1 (LLVM 17.0.6)
device-ID: 10005:0000 surfaces: xcb,xlib,wayland
Audio:
Device-1: NVIDIA TU104 HD Audio vendor: eVga.com. driver: snd_hda_intel
v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16 bus-ID: 0a:00.1
chip-ID: 10de:10f8 class-ID: 0403
Device-2: AMD Starship/Matisse HD Audio vendor: Gigabyte
driver: snd_hda_intel v: kernel pcie: gen: 4 speed: 16 GT/s lanes: 16
bus-ID: 0c:00.4 chip-ID: 1022:1487 class-ID: 0403
Device-3: HP HyperX SoloCast driver: hid-generic,snd-usb-audio,usbhid
type: USB rev: 1.1 speed: 12 Mb/s lanes: 1 mode: 1.1 bus-ID: 1-3:3
chip-ID: 03f0:078b class-ID: 0300
Device-4: Razer USA BlackShark V2 Pro
driver: hid-generic,snd-usb-audio,usbhid type: USB rev: 1.1 speed: 12 Mb/s
lanes: 1 mode: 1.1 bus-ID: 1-9:7 chip-ID: 1532:0528 class-ID: 0300
API: ALSA v: k6.8.1-zen1-1-zen status: kernel-api with: aoss
type: oss-emulator tools: N/A
Server-1: PipeWire v: 1.0.4 status: active with: 1: pipewire-pulse
status: active 2: wireplumber status: active 3: pipewire-alsa type: plugin
4: pw-jack type: plugin tools: pactl,pw-cat,pw-cli,wpctl
Network:
Device-1: Realtek RTL8125 2.5GbE vendor: Gigabyte driver: r8169 v: kernel
pcie: gen: 2 speed: 5 GT/s lanes: 1 port: f000 bus-ID: 08:00.0
chip-ID: 10ec:8125 class-ID: 0200
IF: eno1 state: up speed: 1000 Mbps duplex: full mac: <filter>
Info: services: NetworkManager, smbd, systemd-timesyncd
Drives:
Local Storage: total: 1.36 TiB used: 41.61 GiB (3.0%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Samsung model: SSD 980 PRO 500GB
size: 465.76 GiB block-size: physical: 512 B logical: 512 B speed: 63.2 Gb/s
lanes: 4 tech: SSD serial: <filter> fw-rev: 3B2QGXA7 temp: 45.9 C
scheme: MBR
ID-2: /dev/nvme1n1 maj-min: 259:2 vendor: Samsung
model: SSD 970 EVO Plus 500GB size: 465.76 GiB block-size: physical: 512 B
logical: 512 B speed: 31.6 Gb/s lanes: 4 tech: SSD serial: <filter>
fw-rev: 2B2QEXM7 temp: 29.9 C scheme: GPT
ID-3: /dev/sda maj-min: 8:0 vendor: Samsung model: SSD 860 EVO 500GB
size: 465.76 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
tech: SSD serial: <filter> fw-rev: 4B6Q scheme: GPT
Partition:
ID-1: / raw-size: 465.76 GiB size: 465.76 GiB (100.00%)
used: 41.61 GiB (8.9%) fs: btrfs dev: /dev/nvme0n1p1 maj-min: 259:1
ID-2: /home raw-size: 465.76 GiB size: 465.76 GiB (100.00%)
used: 41.61 GiB (8.9%) fs: btrfs dev: /dev/nvme0n1p1 maj-min: 259:1
ID-3: /var/log raw-size: 465.76 GiB size: 465.76 GiB (100.00%)
used: 41.61 GiB (8.9%) fs: btrfs dev: /dev/nvme0n1p1 maj-min: 259:1
ID-4: /var/tmp raw-size: 465.76 GiB size: 465.76 GiB (100.00%)
used: 41.61 GiB (8.9%) fs: btrfs dev: /dev/nvme0n1p1 maj-min: 259:1
Swap:
Kernel: swappiness: 133 (default 60) cache-pressure: 100 (default) zswap: no
ID-1: swap-1 type: zram size: 31.28 GiB used: 0 KiB (0.0%) priority: 100
comp: zstd avail: lzo,lzo-rle,lz4,lz4hc,842 max-streams: 16 dev: /dev/zram0
Sensors:
System Temperatures: cpu: 60.6 C mobo: 43.0 C
Fan Speeds (rpm): N/A
Info:
Memory: total: 32 GiB available: 31.28 GiB used: 8.5 GiB (27.2%)
Processes: 434 Power: uptime: 6h 49m states: freeze,mem,disk suspend: deep
avail: s2idle wakeups: 0 hibernate: platform avail: shutdown, reboot,
suspend, test_resume image: 12.47 GiB services: org_kde_powerdevil,
power-profiles-daemon, upowerd Init: systemd v: 255 default: graphical
tool: systemctl
Packages: pm: dpkg pkgs: 0 tools: apt,apt-get,gnome-software pm: pacman
pkgs: 2100 libs: 570 tools: octopi,paru Compilers: clang: 17.0.6 gcc: 13.2.1
Shell: garuda-inxi default: fish v: 3.7.0 running-in: konsole inxi: 3.3.33
Garuda (2.6.23-1):
System install date:     2024-03-15
Last full system update: 2024-03-18 ↻
Is partially upgraded:   No
Relevant software:       snapper NetworkManager dracut nvidia-dkms
Windows dual boot:       <superuser required>
Failed units:

[NaN]

If you have read the template this is not a general technical help forum. Something like this can be easily solved with a very basic google search.

If pacman has installed them in the usual place the g++ expects libraries to be like /usr/lib or some such default directory then you don’t have to do anything. However if they are installed in a special directory. Like the avr libs are installed in /usr/avr this is obviously non standard and g++ doesn’t know about this it needs to be pointed to these headers and libs.

To view what file is kept where do a,

pacman -Ql pkgname

This will give you path of every file this package installed in your system.

The easiest way to maintain such special directories would be to write a cmake file for including them. If you don’t want to you can directly just pass them to g++ using flags from command line. For example,

g++ cppfile.cpp -I/path/to/headers

this tells g++ to look for headers in places other than standard paths (/usr/include). There are similarly more such flags to tell g++ to look for libraries in paths other than standard path (/usr/lib) and link them in a project yes you need to tell compiler to link your non standard libs search for them with any search engine.