examples: fix build with old pkg-config

Not all versions of pkg-config in distros have support for the
--define-prefix flag [1], causing errors when building examples manually or
with test-meson-builds.sh script [2].

For the former case, we need to remove the hard-coded use of the flag in
the Makefiles.

For the latter case, the flag is necessary for builds to succeed, so we
skip the tests when it's not present, passing it as part of the pkg-config
command if it is supported.

[1]
CentOS Linux release 7.7.1908 (Core)
pkg-config version 0.27.1

[2]
 ## Building cmdline
Unknown option --define-prefix
gmake: Entering directory
`...ild-x86-default/install-root/usr/local/share/dpdk/examples/cmdline'
rm -f build/cmdline build/cmdline-static build/cmdline-shared
test -d build && rmdir -p build || true
Unknown option --define-prefix
Unknown option --define-prefix
gcc -O3  main.c commands.c parse_obj_list.c -o build/cmdline-shared
main.c:14:28: fatal error: cmdline_rdline.h: No such file or directory

Fixes: ca9268529d2b ("examples: support relocated DPDK install")
Fixes: 7f80a2102bbb ("devtools: test pkg-config file")
Cc: [email protected]

Reported-by: Ferruh Yigit <[email protected]>
Signed-off-by: Bruce Richardson <[email protected]>
Tested-by: Ferruh Yigit <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/timer/Makefile b/examples/timer/Makefile
index a861783551..21f05918c5 100644
--- a/examples/timer/Makefile
+++ b/examples/timer/Makefile
@@ -17,7 +17,7 @@ shared: build/$(APP)-shared
 static: build/$(APP)-static
 	ln -sf $(APP)-static build/$(APP)
 
-PKGCONF=pkg-config --define-prefix
+PKGCONF ?= pkg-config
 
 PC_FILE := $(shell $(PKGCONF) --path libdpdk)
 CFLAGS += -O3 $(shell $(PKGCONF) --cflags libdpdk)