new custom dependency lookup for libdl

2 files changed, 28 insertions, 0 deletions

diff --git a/mesonbuild/dependencies/__init__.py b/mesonbuild/dependencies/__init__.py
index ff0bd30..b0c25b1 100644
--- a/mesonbuild/dependencies/__init__.py
+++ b/mesonbuild/dependencies/__init__.py
@@ -36,6 +36,7 @@ from .misc import (
     BlocksDependency, OpenMPDependency, cups_factory, curses_factory, gpgme_factory,
     libgcrypt_factory, libwmf_factory, netcdf_factory, pcap_factory, python3_factory,
     shaderc_factory, threads_factory, ThreadDependency, iconv_factory, intl_factory,
+    dl_factory
 )
 from .platform import AppleFrameworks
 from .qt import qt4_factory, qt5_factory, qt6_factory
@@ -254,6 +255,7 @@ packages.update({
     'shaderc': shaderc_factory,
     'iconv': iconv_factory,
     'intl': intl_factory,
+    'dl': dl_factory,
 
     # From platform:
     'appleframeworks': AppleFrameworks,
diff --git a/mesonbuild/dependencies/misc.py b/mesonbuild/dependencies/misc.py
index 470305e..c95f7da 100644
--- a/mesonbuild/dependencies/misc.py
+++ b/mesonbuild/dependencies/misc.py
@@ -60,6 +60,25 @@ def netcdf_factory(env: 'Environment',
     return candidates
 
 
+class DlBuiltinDependency(BuiltinDependency):
+    def __init__(self, name: str, env: 'Environment', kwargs: T.Dict[str, T.Any]):
+        super().__init__(name, env, kwargs)
+
+        if self.clib_compiler.has_function('dlopen', '#include <dlfcn.h>', env)[0]:
+            self.is_found = True
+
+
+class DlSystemDependency(SystemDependency):
+    def __init__(self, name: str, env: 'Environment', kwargs: T.Dict[str, T.Any]):
+        super().__init__(name, env, kwargs)
+
+        h = self.clib_compiler.has_header('dlfcn.h', '', env)
+        self.link_args = self.clib_compiler.find_library('dl', env, [], self.libtype)
+
+        if h[0] and self.link_args:
+            self.is_found = True
+
+
 class OpenMPDependency(SystemDependency):
     # Map date of specification release (which is the macro value) to a version.
     VERSIONS = {
@@ -559,6 +578,13 @@ cups_factory = DependencyFactory(
     cmake_name='Cups',
 )
 
+dl_factory = DependencyFactory(
+    'dl',
+    [DependencyMethods.BUILTIN, DependencyMethods.SYSTEM],
+    builtin_class=DlBuiltinDependency,
+    system_class=DlSystemDependency,
+)
+
 gpgme_factory = DependencyFactory(
     'gpgme',
     [DependencyMethods.PKGCONFIG, DependencyMethods.CONFIG_TOOL],