Allow many version conditions for pkg-config deps

Sometimes we want to restrict the acceptable versions to a list of
versions, or a smallest-version + largest-version, or both. For
instance, GStreamer's opencv plugin is only compatible with
3.1.0 >= opencv >= 2.3.0

6 files changed, 59 insertions, 20 deletions

diff --git a/mesonbuild/backend/ninjabackend.py b/mesonbuild/backend/ninjabackend.py
index bd65cbe..d0267bc 100644
--- a/mesonbuild/backend/ninjabackend.py
+++ b/mesonbuild/backend/ninjabackend.py
@@ -1017,9 +1017,11 @@ int dummy;
             args += valac.get_werror_args()
         for d in target.get_external_deps():
             if isinstance(d, dependencies.PkgConfigDependency):
-                if d.name == 'glib-2.0' and d.version_requirement is not None \
-                   and d.version_requirement.startswith(('>=', '==')):
-                    args += ['--target-glib', d.version_requirement[2:]]
+                if d.name == 'glib-2.0' and d.version_reqs is not None:
+                    for req in d.version_reqs:
+                        if req.startswith(('>=', '==')):
+                            args += ['--target-glib', req[2:]]
+                            break
                 args += ['--pkg', d.name]
             elif isinstance(d, dependencies.ExternalLibrary):
                 args += d.get_lang_args('vala')
diff --git a/mesonbuild/dependencies.py b/mesonbuild/dependencies.py
index 4e87e4e..a092732 100644
--- a/mesonbuild/dependencies.py
+++ b/mesonbuild/dependencies.py
@@ -23,7 +23,7 @@ import re
 import os, stat, glob, subprocess, shutil
 import sysconfig
 from collections import OrderedDict
-from . mesonlib import MesonException
+from . mesonlib import MesonException, version_compare, version_compare_many
 from . import mlog
 from . import mesonlib
 from .environment import detect_cpu_family, for_windows
@@ -135,22 +135,27 @@ class PkgConfigDependency(Dependency):
             self.modversion = 'none'
             return
         found_msg = ['%s dependency' % self.type_string, mlog.bold(name), 'found:']
-        self.version_requirement = kwargs.get('version', None)
-        if self.version_requirement is None:
+        self.version_reqs = kwargs.get('version', None)
+        if self.version_reqs is None:
             self.is_found = True
         else:
-            if not isinstance(self.version_requirement, str):
-                raise DependencyException('Version argument must be string.')
-            self.is_found = mesonlib.version_compare(self.modversion, self.version_requirement)
+            if not isinstance(self.version_reqs, (str, list)):
+                raise DependencyException('Version argument must be string or list.')
+            (self.is_found, not_found, found) = \
+                version_compare_many(self.modversion, self.version_reqs)
             if not self.is_found:
-                found_msg += [mlog.red('NO'), 'found {!r}'.format(self.modversion),
-                              'but need {!r}'.format(self.version_requirement)]
+                found_msg += [mlog.red('NO'),
+                              'found {!r} but need:'.format(self.modversion),
+                              ', '.join(["'{}'".format(e) for e in not_found])]
+                if found:
+                    found_msg += ['; matched:',
+                                  ', '.join(["'{}'".format(e) for e in found])]
                 if not self.silent:
                     mlog.log(*found_msg)
                 if self.required:
                     raise DependencyException(
                         'Invalid version of a dependency, needed %s %s found %s.' %
-                        (name, self.version_requirement, self.modversion))
+                        (name, not_found, self.modversion))
                 return
         found_msg += [mlog.green('YES'), self.modversion]
         if not self.silent:
@@ -301,7 +306,7 @@ class WxDependency(Dependency):
             self.modversion = out.decode().strip()
             version_req = kwargs.get('version', None)
             if version_req is not None:
-                if not mesonlib.version_compare(self.modversion, version_req):
+                if not version_compare(self.modversion, version_req, strict=True):
                     mlog.log('Wxwidgets version %s does not fullfill requirement %s' %\
                              (self.modversion, version_req))
                     return
diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter.py
index ef99511..e9273e4 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter.py
@@ -1862,7 +1862,8 @@ requirements use the version keyword argument instead.''')
             if 'version' in kwargs:
                 wanted = kwargs['version']
                 found = cached_dep.get_version()
-                if not cached_dep.found() or not mesonlib.version_compare(found, wanted):
+                if not cached_dep.found() or \
+                   not mesonlib.version_compare_many(found, wanted)[0]:
                     # Cached dep has the wrong version. Check if an external
                     # dependency or a fallback dependency provides it.
                     cached_dep = None
diff --git a/mesonbuild/mesonlib.py b/mesonbuild/mesonlib.py
index 4d9cc69..4670685 100644
--- a/mesonbuild/mesonlib.py
+++ b/mesonbuild/mesonlib.py
@@ -146,21 +146,26 @@ def detect_vcs(source_dir):
                 return vcs
     return None
 
-def grab_leading_numbers(vstr):
+def grab_leading_numbers(vstr, strict=False):
     result = []
     for x in vstr.split('.'):
         try:
             result.append(int(x))
-        except ValueError:
+        except ValueError as e:
+            if strict:
+                msg = 'Invalid version to compare against: {!r}; only ' \
+                      'numeric digits separated by "." are allowed: ' + str(e)
+                raise MesonException(msg.format(vstr))
             break
     return result
 
 numpart = re.compile('[0-9.]+')
 
-def version_compare(vstr1, vstr2):
+def version_compare(vstr1, vstr2, strict=False):
     match = numpart.match(vstr1.strip())
     if match is None:
-        raise MesonException('Uncomparable version string %s.' % vstr1)
+        msg = 'Uncomparable version string {!r}.'
+        raise MesonException(msg.format(vstr1))
     vstr1 = match.group(0)
     if vstr2.startswith('>='):
         cmpop = operator.ge
@@ -185,10 +190,22 @@ def version_compare(vstr1, vstr2):
         vstr2 = vstr2[1:]
     else:
         cmpop = operator.eq
-    varr1 = grab_leading_numbers(vstr1)
-    varr2 = grab_leading_numbers(vstr2)
+    varr1 = grab_leading_numbers(vstr1, strict)
+    varr2 = grab_leading_numbers(vstr2, strict)
     return cmpop(varr1, varr2)
 
+def version_compare_many(vstr1, conditions):
+    if not isinstance(conditions, (list, tuple)):
+        conditions = [conditions]
+    found = []
+    not_found = []
+    for req in conditions:
+        if not version_compare(vstr1, req, strict=True):
+            not_found.append(req)
+        else:
+            found.append(req)
+    return (not_found == [], not_found, found)
+
 def default_libdir():
     if is_debianlike():
         try:
diff --git a/test cases/failing/37 pkgconfig dependency impossible conditions/meson.build b/test cases/failing/37 pkgconfig dependency impossible conditions/meson.build
new file mode 100644
index 0000000..54d434c
--- /dev/null
+++ b/test cases/failing/37 pkgconfig dependency impossible conditions/meson.build
@@ -0,0 +1,3 @@
+project('impossible-dep-test', 'c', version : '1.0')
+
+dependency('zlib', version : ['>=1.0', '<1.0'])
diff --git a/test cases/linuxlike/5 dependency versions/meson.build b/test cases/linuxlike/5 dependency versions/meson.build
index 1de87c8..7f29564 100644
--- a/test cases/linuxlike/5 dependency versions/meson.build
+++ b/test cases/linuxlike/5 dependency versions/meson.build
@@ -10,6 +10,17 @@ assert(zlib.type_name() == 'pkgconfig', 'zlib should be of type "pkgconfig" not
 zlibver = dependency('zlib', version : '<1.0', required : false)
 assert(zlibver.found() == false, 'zlib <1.0 should not be found!')
 
+# Find external dependencies with various version restrictions
+dependency('zlib', version : '>=1.0')
+dependency('zlib', version : '<=9999')
+dependency('zlib', version : '=' + zlib.version())
+
+# Find external dependencies with multiple version restrictions
+dependency('zlib', version : ['>=1.0', '<=9999'])
+if dependency('zlib', version : ['<=1.0', '>=9999', '=' + zlib.version()], required : false).found()
+  error('zlib <=1.0 >=9999 should not have been found')
+endif
+
 # Test https://github.com/mesonbuild/meson/pull/610
 dependency('somebrokenlib', version : '>=2.0', required : false)
 dependency('somebrokenlib', version : '>=1.0', required : false)