[dpdk-dev] [PATCH v3 3/4] buildtools/chkincs: add app to verify header includes

Bruce Richardson bruce.richardson at intel.com
Mon Jan 25 15:11:14 CET 2021


To verify that all DPDK headers are ok for inclusion directly in a C file,
and are not missing any other pre-requisite headers, we can auto-generate
for each header an empty C file that includes that header. Compiling these
files will throw errors if any header has unmet dependencies.

To ensure ongoing compliance, we enable this build test as part of the
default x86 build in "test-meson-builds.sh".

Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
---
 MAINTAINERS                                 |  4 +++
 buildtools/chkincs/gen_c_file_for_header.py | 12 +++++++
 buildtools/chkincs/main.c                   |  4 +++
 buildtools/chkincs/meson.build              | 40 +++++++++++++++++++++
 devtools/test-meson-builds.sh               |  2 +-
 meson.build                                 |  5 +++
 6 files changed, 66 insertions(+), 1 deletion(-)
 create mode 100755 buildtools/chkincs/gen_c_file_for_header.py
 create mode 100644 buildtools/chkincs/main.c
 create mode 100644 buildtools/chkincs/meson.build

diff --git a/MAINTAINERS b/MAINTAINERS
index aa973a3960..6df494e367 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1560,6 +1560,10 @@ F: app/test/test_resource.c
 F: app/test/virtual_pmd.c
 F: app/test/virtual_pmd.h
 
+Header build sanity checking
+M: Bruce Richardson <bruce.richardson at intel.com>
+F: buildtools/chkincs/
+
 Sample packet helper functions for unit test
 M: Reshma Pattan <reshma.pattan at intel.com>
 F: app/test/sample_packet_forward.c
diff --git a/buildtools/chkincs/gen_c_file_for_header.py b/buildtools/chkincs/gen_c_file_for_header.py
new file mode 100755
index 0000000000..ed46948aea
--- /dev/null
+++ b/buildtools/chkincs/gen_c_file_for_header.py
@@ -0,0 +1,12 @@
+#! /usr/bin/env python3
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2021 Intel Corporation
+
+from sys import argv
+from os.path import abspath
+
+(h_file, c_file) = argv[1:]
+
+contents = '#include "' + abspath(h_file) + '"'
+with open(c_file, 'w') as cf:
+    cf.write(contents)
diff --git a/buildtools/chkincs/main.c b/buildtools/chkincs/main.c
new file mode 100644
index 0000000000..d25bb8852a
--- /dev/null
+++ b/buildtools/chkincs/main.c
@@ -0,0 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2021 Intel Corporation
+ */
+int main(void) { return 0; }
diff --git a/buildtools/chkincs/meson.build b/buildtools/chkincs/meson.build
new file mode 100644
index 0000000000..5dc43283e0
--- /dev/null
+++ b/buildtools/chkincs/meson.build
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2021 Intel Corporation
+
+if not get_option('check_includes')
+	build = false
+	subdir_done()
+endif
+
+if is_windows
+	# for windows, the shebang line in the script won't work.
+	error('option "check_includes" is not supported on windows')
+endif
+
+gen_c_file_for_header = find_program('gen_c_file_for_header.py')
+gen_c_files = generator(gen_c_file_for_header,
+	output: '@BASENAME at .c',
+	arguments: ['@INPUT@', '@OUTPUT@'])
+
+cflags = machine_args
+cflags += '-Wno-unused-function' # needed if we include generic headers
+cflags += '-DALLOW_EXPERIMENTAL_API'
+
+# some ethdev headers depend on bus headers
+includes = include_directories('../../drivers/bus/pci',
+	'../../drivers/bus/vdev')
+
+sources = files('main.c')
+sources += gen_c_files.process(dpdk_chkinc_headers)
+
+deps = []
+foreach l:enabled_libs
+	deps += get_variable('static_rte_' + l)
+endforeach
+
+executable('chkincs', sources,
+	c_args: cflags,
+	include_directories: includes,
+	dependencies: deps,
+	link_whole: dpdk_static_libraries + dpdk_drivers,
+	install: false)
diff --git a/devtools/test-meson-builds.sh b/devtools/test-meson-builds.sh
index efa91e0e40..07b5e6aeca 100755
--- a/devtools/test-meson-builds.sh
+++ b/devtools/test-meson-builds.sh
@@ -227,7 +227,7 @@ default_machine='nehalem'
 if ! check_cc_flags "-march=$default_machine" ; then
 	default_machine='corei7'
 fi
-build build-x86-default cc skipABI \
+build build-x86-default cc skipABI -Dcheck_includes=true\
 	-Dlibdir=lib -Dmachine=$default_machine $use_shared
 
 # 32-bit with default compiler
diff --git a/meson.build b/meson.build
index 7c9a8fce5f..9aa7882911 100644
--- a/meson.build
+++ b/meson.build
@@ -69,6 +69,11 @@ if get_option('enable_kmods')
 	subdir('kernel')
 endif
 
+# check header includes if requested
+if get_option('check_includes')
+	subdir('buildtools/chkincs')
+endif
+
 # write the build config
 build_cfg = 'rte_build_config.h'
 configure_file(output: build_cfg,
-- 
2.27.0



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