dependencies: Convert /c/foo/bar paths to C:/foo/bar

MSVC cannot handle MinGW-esque /c/foo paths, convert them to C:/foo.
We cannot resolve other paths starting with / like /home/foo so leave
them as-is so the user gets an error/warning from the compiler/linker.

These paths are commonly found in pkg-config files generated using
Autotools inside MinGW/MSYS and MinGW/MSYS2 environments.

Currently this is only done for PkgConfigDependency.

1 files changed, 15 insertions, 0 deletions

diff --git a/mesonbuild/dependencies/base.py b/mesonbuild/dependencies/base.py
index a720232..81b93c4 100644
--- a/mesonbuild/dependencies/base.py
+++ b/mesonbuild/dependencies/base.py
@@ -22,6 +22,7 @@ import shlex
 import shutil
 import textwrap
 from enum import Enum
+from pathlib import PurePath
 
 from .. import mlog
 from .. import mesonlib
@@ -424,6 +425,20 @@ class PkgConfigDependency(ExternalDependency):
         self.link_args = []
         libpaths = []
         for lib in shlex.split(out):
+            # MSVC cannot handle MinGW-esque /c/foo paths, convert them to C:/foo.
+            # We cannot resolve other paths starting with / like /home/foo so leave
+            # them as-is so the user gets an error/warning from the compiler/linker.
+            if self.compiler.id == 'msvc':
+                # Library search path
+                if lib.startswith('-L/'):
+                    pargs = PurePath(lib[2:]).parts
+                    if len(pargs) > 1 and len(pargs[1]) == 1:
+                        lib = '-L{}:/{}'.format(pargs[1], '/'.join(pargs[2:]))
+                # Full path to library or .la file
+                elif lib.startswith('/'):
+                    pargs = PurePath(lib).parts
+                    if len(pargs) > 1 and len(pargs[1]) == 1:
+                        lib = '{}:/{}'.format(pargs[1], '/'.join(pargs[2:]))
             # If we want to use only static libraries, we have to look for the
             # file ourselves instead of depending on the compiler to find it
             # with -lfoo or foo.lib. However, we can only do this if we already