[dpdk-stable] [PATCH v7 03/17] build: detect execinfo library on Linux

[Thomas Monjalon]

The library execinfo and its header file can be installed on Alpine Linux
where the backtrace feature is not part of musl libc:
	apk add libexecinfo-dev

As a consequence, this library should not be restricted to BSD only.

At the same time, the library and header are detected once and added
globally to be linked with any application, internal or external.

Fixes: 9065b1fac65f ("build: fix dependency on execinfo for BSD meson builds")
Cc: stable at dpdk.org

Signed-off-by: Thomas Monjalon <thomas at monjalon.net>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
Acked-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>
Acked-by: David Marchand <david.marchand at redhat.com>
---
 app/meson.build      | 4 ----
 app/test/meson.build | 1 -
 config/meson.build   | 9 ++++++---
 examples/meson.build | 4 +---
 4 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/app/meson.build b/app/meson.build
index 87fc195dbf..50a53dbde8 100644
--- a/app/meson.build
+++ b/app/meson.build
@@ -21,9 +21,6 @@ apps = [
 	'test-regex',
 	'test-sad']
 
-# for BSD only
-lib_execinfo = cc.find_library('execinfo', required: false)
-
 default_cflags = machine_args + ['-DALLOW_EXPERIMENTAL_API']
 default_ldflags = []
 if get_option('default_library') == 'static' and not is_windows
@@ -53,7 +50,6 @@ foreach app:apps
 			dep_objs += get_variable(get_option('default_library')
 				 + '_rte_' + d)
 		endforeach
-		dep_objs += lib_execinfo
 
 		link_libs = []
 		if get_option('default_library') == 'static'
diff --git a/app/test/meson.build b/app/test/meson.build
index 561e493a29..099895fc87 100644
--- a/app/test/meson.build
+++ b/app/test/meson.build
@@ -426,7 +426,6 @@ foreach d:test_deps
 	def_lib = get_option('default_library')
 	test_dep_objs += get_variable(def_lib + '_rte_' + d)
 endforeach
-test_dep_objs += cc.find_library('execinfo', required: false)
 
 link_libs = []
 if get_option('default_library') == 'static'
diff --git a/config/meson.build b/config/meson.build
index 3cf560b8a3..66a2edcc47 100644
--- a/config/meson.build
+++ b/config/meson.build
@@ -125,11 +125,8 @@ if cc.find_library('m', required : false).found()
 	dpdk_extra_ldflags += '-lm'
 endif
 
-# for linux link against dl, for bsd execinfo
 if is_linux
 	link_lib = 'dl'
-elif is_freebsd
-	link_lib = 'execinfo'
 else
 	link_lib = ''
 endif
@@ -166,6 +163,12 @@ if fdt_dep.found() and cc.has_header('fdt.h')
 	dpdk_extra_ldflags += '-lfdt'
 endif
 
+libexecinfo = cc.find_library('libexecinfo', required: false)
+if libexecinfo.found() and cc.has_header('execinfo.h')
+	add_project_link_arguments('-lexecinfo', language: 'c')
+	dpdk_extra_ldflags += '-lexecinfo'
+endif
+
 # check for libbsd
 libbsd = dependency('libbsd', required: false, method: 'pkg-config')
 if libbsd.found()
diff --git a/examples/meson.build b/examples/meson.build
index 3fe08d4ca5..d065a6a08b 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -6,8 +6,6 @@ if get_option('default_library') == 'static'
 	link_whole_libs = dpdk_static_libraries + dpdk_drivers
 endif
 
-execinfo = cc.find_library('execinfo', required: false)
-
 # list of all example apps. Keep 1-3 per line, in alphabetical order.
 all_examples = [
 	'bbdev_app', 'bond',
@@ -82,7 +80,7 @@ foreach example: examples
 	cflags = default_cflags
 	ldflags = default_ldflags
 
-	ext_deps = [execinfo]
+	ext_deps = []
 	includes = [include_directories(example)]
 	deps = ['eal', 'mempool', 'net', 'mbuf', 'ethdev', 'cmdline']
 	subdir(example)
-- 
2.30.1