[dpdk-dev] [PATCH v2 1/1] devtools: fix build test config inheritance from env

[Thomas Monjalon <thomas@monjalon.net>]

The variables DPDK_MESON_OPTIONS, PATH, PKG_CONFIG_PATH,
CPPFLAGS, CFLAGS and LDFLAGS can be customized in the config file
loaded by devtools/load-devel-config at each build.
The configuration can be adjusted per target thanks to the value set
in the DPDK_TARGET variable.

PKG_CONFIG_PATH is specific to each target, so it must be empty
before configuring each build from the file according to DPDK_TARGET.
Inheriting a default PKG_CONFIG_PATH for all targets does not make sense
and is prone to confusion.

DPDK_MESON_OPTIONS might take a global initial value from environment
to customize a build test from the shell. Example:
	DPDK_MESON_OPTIONS="b_lto=true"
Some target-specific options can be added in the configuration file:
	DPDK_MESON_OPTIONS="$DPDK_MESON_OPTIONS kernel_dir=$MYKERNEL"

Fixes: 272236741258 ("devtools: load target-specific compilation environment")
Cc: stable@dpdk.org

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
Tested-by: Jerin Jacob <jerinj@marvell.com>
---
v2:
- unset PKG_CONFIG_PATH because empty is printed by meson
- add more comments
---
 devtools/test-meson-builds.sh | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/devtools/test-meson-builds.sh b/devtools/test-meson-builds.sh
index 0c95d1cc98..f32b5784f4 100755
--- a/devtools/test-meson-builds.sh
+++ b/devtools/test-meson-builds.sh
@@ -38,10 +38,10 @@ else
 fi
 
 default_path=$PATH
-default_pkgpath=$PKG_CONFIG_PATH
 default_cppflags=$CPPFLAGS
 default_cflags=$CFLAGS
 default_ldflags=$LDFLAGS
+default_meson_options=$DPDK_MESON_OPTIONS
 
 check_cc_flags () # <flag to check> <flag2> ...
 {
@@ -52,12 +52,14 @@ check_cc_flags () # <flag to check> <flag2> ...
 load_env () # <target compiler>
 {
 	targetcc=$1
+	# reset variables before target-specific config
 	export PATH=$default_path
-	export PKG_CONFIG_PATH=$default_pkgpath
+	unset PKG_CONFIG_PATH # global default makes no sense
 	export CPPFLAGS=$default_cppflags
 	export CFLAGS=$default_cflags
 	export LDFLAGS=$default_ldflags
-	unset DPDK_MESON_OPTIONS
+	export DPDK_MESON_OPTIONS=$default_meson_options
+	# set target hint for use in the loaded config file
 	if [ -n "$target_override" ] ; then
 		DPDK_TARGET=$target_override
 	elif command -v $targetcc >/dev/null 2>&1 ; then
-- 
2.28.0