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drivers: improve pmdinfo generation with meson

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Since meson 0.44, changing any file inside a PMD directory (quite
correctly) triggers a full re-run of meson on build, rather than an
incremental build as with earlier versions. This rerun is needed because
we use "grep" in meson to search for files on which to run pmdinfogen, and
changing any of those files means that grep and, therefore meson, needs to
be rerun. [Previous versions of meson did not track this dependency on the
grep command, and so did incremental builds only.]

If, however, we take advantage of pmdinfogen's ability to use stdin and
stdout instead of files, we can instead use a shell script to process an
entire static archive and generate a single .c file from it. This
eliminates the need for grep, and means that changes to a PMD file only
need an incremental build - a significant time saving.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
This commit is contained in:
Bruce Richardson 2018-01-25 11:14:43 +00:00
parent 69faa6907c
commit 45775d7512
2 changed files with 20 additions and 20 deletions
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9
buildtools/gen-pmdinfo-cfile.sh
View File

@ -6,7 +6,8 @@ arfile=$1
output=$2
pmdinfogen=$3
tmp_o=${output%.c.pmd.c}.tmp.o
ar p $arfile > $tmp_o && \
$pmdinfogen $tmp_o $output
echo > $output
for ofile in `ar t $arfile` ; do
ar p $arfile $ofile | $pmdinfogen - - >> $output 2> /dev/null
done
exit 0

23
drivers/meson.build
View File

@ -45,6 +45,7 @@ foreach class:driver_classes
if build
dpdk_conf.set(config_flag_fmt.format(name.to_upper()),1)
lib_name = driver_name_fmt.format(name)
if allow_experimental_apis
cflags += '-DALLOW_EXPERIMENTAL_API'
@ -61,21 +62,22 @@ foreach class:driver_classes
static_objs += ext_deps
dpdk_extra_ldflags += pkgconfig_extra_libs
# generate pmdinfo sources
pmdinfogen_srcs = run_command('grep', '--files-with-matches',
'RTE_PMD_REGISTER_.*(.*)', sources).stdout().strip().split()
foreach src: pmdinfogen_srcs
out_filename = '@0@.pmd.c'.format(src.split('/')[-1])
tmp_lib = static_library('tmp_@0@'.format(src.underscorify()),
src, include_directories: includes,
# generate pmdinfo sources by building a temporary
# lib and then running pmdinfogen on the contents of
# that lib. The final lib reuses the object files and
# adds in the new source file.
out_filename = lib_name + '.pmd.c'
tmp_lib = static_library('tmp_' + lib_name,
sources,
include_directories: includes,
dependencies: static_objs,
c_args: cflags)
sources += custom_target(out_filename,
objs += tmp_lib.extract_all_objects()
sources = custom_target(out_filename,
command: [pmdinfo, tmp_lib.full_path(),
'@OUTPUT@', pmdinfogen],
output: out_filename,
depends: [pmdinfogen, tmp_lib])
endforeach
if get_option('per_library_versions')
lib_version = '@0@.1'.format(version)
@ -88,7 +90,6 @@ foreach class:driver_classes
endif
# now build the static driver
lib_name = driver_name_fmt.format(name)
static_lib = static_library(lib_name,
sources,
objects: objs,
@ -98,8 +99,6 @@ foreach class:driver_classes
install: true)
# now build the shared driver
sources = []
objs += static_lib.extract_all_objects()
version_map = '@0@/@1@/@2@_version.map'.format(
meson.current_source_dir(),
drv_path, lib_name)