[dpdk-dev] [PATCH] buildtools: fix build with meson 0.60

[Dmitry Kozlyuk]

Meson 0.60 switched the format of uninstalled static libraries
to thin archives, that is, they contain only paths to object files,
not the files themselves. Files cannot be extracted in this case,
resulting in build errors:

    ar: `x' cannot be used on thin archives.

Handle thin archives when invoking pmdinfogen
by directly using the files referenced in the archive.

Bugzilla ID: 836
Fixes: e6e9730c7066 ("buildtools: support object file extraction for Windows")
Cc: stable at dpdk.org

Reported-by: Michal Berger <michallinuxstuff at gmail.com>
Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk at gmail.com>
---
 buildtools/gen-pmdinfo-cfile.py | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/buildtools/gen-pmdinfo-cfile.py b/buildtools/gen-pmdinfo-cfile.py
index 58fe3ad152..3453e5b4b9 100644
--- a/buildtools/gen-pmdinfo-cfile.py
+++ b/buildtools/gen-pmdinfo-cfile.py
@@ -8,13 +8,18 @@
 import tempfile
 
 _, tmp_root, ar, archive, output, *pmdinfogen = sys.argv
-with tempfile.TemporaryDirectory(dir=tmp_root) as temp:
-    run_ar = lambda command: subprocess.run(
-        [ar, command, os.path.abspath(archive)],
-        stdout=subprocess.PIPE, check=True, cwd=temp
-    )
-    # Don't use "ar p", because its output is corrupted on Windows.
-    run_ar("x")
-    names = run_ar("t").stdout.decode().splitlines()
-    paths = [os.path.join(temp, name) for name in names]
+archive = os.path.abspath(archive)
+names = subprocess.run([ar, "t", archive],
+    stdout=subprocess.PIPE, check=True).stdout.decode().splitlines()
+with open(archive, "rb") as f:
+    is_thin = f.read(7) == b"!<thin>"
+if is_thin:
+    # Thin archive needs no unpacking, just use the paths within.
+    paths = [os.path.join(archive, name) for name in names]
     subprocess.run(pmdinfogen + paths + [output], check=True)
+else:
+    with tempfile.TemporaryDirectory(dir=tmp_root) as temp:
+        # Don't use "ar p", because its output is corrupted on Windows.
+        paths = [os.path.join(temp, name) for name in names]
+        subprocess.run([ar, "x", archive], check=True, cwd=temp)
+        subprocess.run(pmdinfogen + paths + [output], check=True)
-- 
2.29.3