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Dynamically load libudev.so.1 on Linux if udev=yes

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This makes it possibly to run Linux binaries compiled with udev support on
Linux systems which do not provide udev (typically systemd-less distros).

If udev is missing, we fall back to parsing `/dev/input` like when compiled
without udev support (`udev=no`).

Also adding some verbose debug statements to know which method we're using
when debugging Linux joypad issues.

The libudev so wrappers were generated on Mageia 8 with libudev 246.9 using
https://github.com/hpvb/dynload-wrapper:
```
./generate-wrapper.py --include /usr/include/libudev.h --sys-include '<libudev.h>' \
  --soname libudev.so.1 --init-name libudev --omit-prefix gnu_ \
  --output-header libudev-so_wrap.h --output-implementation libudev-so_wrap.c
```
This commit is contained in:
Rémi Verschelde 2021-02-17 11:28:27 +01:00
parent fa8a47e1bf
commit a10c259c1d
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GPG key ID: C3336907360768E1
8 changed files with 1154 additions and 14 deletions
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4
platform/linuxbsd/detect.py
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@ -325,14 +325,14 @@ def configure(env):
if platform.system() == "Linux":
env.Append(CPPDEFINES=["JOYDEV_ENABLED"])
if env["udev"]:
if os.system("pkg-config --exists libudev") == 0: # 0 means found
print("Enabling udev support")
env.Append(CPPDEFINES=["UDEV_ENABLED"])
env.ParseConfig("pkg-config libudev --cflags --libs")
else:
print("libudev development libraries not found, disabling udev support")
else:
env["udev"] = False # Linux specific
# Linkflags below this line should typically stay the last ones
if not env["builtin_zlib"]: