[dpdk-dev] [PATCH v8 2/3] build: use Python pmdinfogen

[Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>]

Use the same interpreter to run pmdinfogen as for other build scripts.
Adjust wrapper script accordingly and also don't suppress stderr from ar
and pmdinfogen.

Add configure-time check for elftools Python module for Unix hosts.

Add python3-pyelftools to CI configuration. The package is available on
all major distributions. FreeBSD has no system requirements section in
its GSG. Currently neither Windows uses pmdinfogen, nor is COFF (PE)
supported.

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
---
 .travis.yml                       |  2 +-
 buildtools/gen-pmdinfo-cfile.sh   |  6 +++---
 buildtools/meson.build            | 15 +++++++++++++++
 doc/guides/linux_gsg/sys_reqs.rst |  6 ++++++
 drivers/meson.build               |  2 +-
 meson.build                       |  1 -
 6 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 5e12db23b..6744f6fc1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,7 +11,7 @@ addons:
   apt:
     update: true
     packages: &required_packages
-      - [libnuma-dev, python3-setuptools, python3-wheel, python3-pip, ninja-build]
+      - [libnuma-dev, python3-setuptools, python3-wheel, python3-pip, python3-pyelftools, ninja-build]
       - [libbsd-dev, libpcap-dev, libibverbs-dev, libcrypto++-dev, libfdt-dev, libjansson-dev]
 
 _aarch64_packages: &aarch64_packages
diff --git a/buildtools/gen-pmdinfo-cfile.sh b/buildtools/gen-pmdinfo-cfile.sh
index 43059cf36..109ee461e 100755
--- a/buildtools/gen-pmdinfo-cfile.sh
+++ b/buildtools/gen-pmdinfo-cfile.sh
@@ -4,11 +4,11 @@
 
 arfile=$1
 output=$2
-pmdinfogen=$3
+shift 2
+pmdinfogen=$*
 
 # The generated file must not be empty if compiled in pedantic mode
 echo 'static __attribute__((unused)) const char *generator = "'$0'";' > $output
 for ofile in `ar t $arfile` ; do
-	ar p $arfile $ofile | $pmdinfogen - - >> $output 2> /dev/null
+	ar p $arfile $ofile | $pmdinfogen - - >> $output
 done
-exit 0
diff --git a/buildtools/meson.build b/buildtools/meson.build
index 04808dabc..dd4c0f640 100644
--- a/buildtools/meson.build
+++ b/buildtools/meson.build
@@ -17,3 +17,18 @@ else
 endif
 map_to_win_cmd = py3 + files('map_to_win.py')
 sphinx_wrapper = py3 + files('call-sphinx-build.py')
+pmdinfogen = py3 + files('pmdinfogen.py')
+
+# TODO: starting from Meson 0.51.0 use
+# 	python3 = import('python').find_installation('python',
+#		modules : python3_required_modules)
+python3_required_modules = []
+if host_machine.system() != 'windows'
+	python3_required_modules = ['elftools']
+endif
+foreach module : python3_required_modules
+	script = 'import importlib.util; import sys; exit(importlib.util.find_spec("@0@") is None)'
+	if run_command(py3, '-c', script.format(module)).returncode() != 0
+		error('missing python module: @0@'.format(module))
+	endif
+endforeach
diff --git a/doc/guides/linux_gsg/sys_reqs.rst b/doc/guides/linux_gsg/sys_reqs.rst
index 6ecdc04aa..89c9f2570 100644
--- a/doc/guides/linux_gsg/sys_reqs.rst
+++ b/doc/guides/linux_gsg/sys_reqs.rst
@@ -52,6 +52,12 @@ Compilation of the DPDK
     * If the packaged version is below the minimum version, the latest versions
       can be installed from Python's "pip" repository: ``pip3 install meson ninja``
 
+*   ``pyelftools`` (version 0.22+)
+
+    * For RHEL/Fedora systems it can be installed using ``dnf install python-pyelftools``
+
+    * For Ubuntu/Debian it can be installed using ``apt install python3-pyelftools``
+
 *   Library for handling NUMA (Non Uniform Memory Access).
 
     * ``numactl-devel`` in RHEL/Fedora;
diff --git a/drivers/meson.build b/drivers/meson.build
index a5a6fed06..94403f7ac 100644
--- a/drivers/meson.build
+++ b/drivers/meson.build
@@ -152,7 +152,7 @@ foreach subpath:subdirs
 						command: [pmdinfo, tmp_lib.full_path(),
 							'@OUTPUT@', pmdinfogen],
 						output: out_filename,
-						depends: [pmdinfogen, tmp_lib])
+						depends: [tmp_lib])
 			endif
 
 			# now build the static driver
diff --git a/meson.build b/meson.build
index 61d9a4f5f..a6e8c09c2 100644
--- a/meson.build
+++ b/meson.build
@@ -45,7 +45,6 @@ subdir('buildtools')
 subdir('config')
 
 # build libs and drivers
-subdir('buildtools/pmdinfogen')
 subdir('lib')
 subdir('drivers')
 
-- 
2.28.0