[PATCH v3 2/4] meson: move headers definition from 'contrib/coccinelle'

[Karthik Nayak <karthik.188@xxxxxxxxx>]

The Meson build for coccinelle static analysis lists all headers to
analyse. Due to the way Meson exports variables between subdirs, this
variable is also available in the root Meson build.

An upcoming commit, will add a new check complimenting 'hdr-check' in
the Makefile. This would require the list of headers. So move the
'coccinelle_headers' to the root Meson build and rename it to 'headers',
remove the root path being appended to each header and retain that in
the coccinelle Meson build since it is specific to the coccinelle build.

Also move the 'third_party_sources' variable to the root Meson build
since it is also a dependency for the 'headers' variable. This also
makes it easier to understand as the variable is now propagated from the
top level to the bottom.

Signed-off-by: Karthik Nayak <karthik.188@xxxxxxxxx>
---
 contrib/coccinelle/meson.build | 17 +----------------
 meson.build                    | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+), 16 deletions(-)

diff --git a/contrib/coccinelle/meson.build b/contrib/coccinelle/meson.build
index 03ce52d752..32568c5103 100644
--- a/contrib/coccinelle/meson.build
+++ b/contrib/coccinelle/meson.build
@@ -8,21 +8,6 @@ if not spatch.found()
   subdir_done()
 endif
 
-third_party_sources = [
-  ':!contrib',
-  ':!compat/inet_ntop.c',
-  ':!compat/inet_pton.c',
-  ':!compat/nedmalloc',
-  ':!compat/obstack.*',
-  ':!compat/poll',
-  ':!compat/regex',
-  ':!sha1collisiondetection',
-  ':!sha1dc',
-  ':!t/unit-tests/clar',
-  ':!t/unit-tests/clar',
-  ':!t/t[0-9][0-9][0-9][0-9]*',
-]
-
 rules = [
   'array.cocci',
   'commit.cocci',
@@ -61,7 +46,7 @@ foreach source : run_command(git, '-C', meson.project_source_root(), 'ls-files',
 endforeach
 
 coccinelle_headers = []
-foreach header : run_command(git, '-C', meson.project_source_root(), 'ls-files', '--deduplicate', '*.h', third_party_sources, check: true).stdout().split()
+foreach header : headers
   coccinelle_headers += meson.project_source_root() / header
 endforeach
 
diff --git a/meson.build b/meson.build
index e98cfa4909..3ca5d01071 100644
--- a/meson.build
+++ b/meson.build
@@ -633,6 +633,28 @@ builtin_sources = [
   'builtin/write-tree.c',
 ]
 
+third_party_sources = [
+  ':!contrib',
+  ':!compat/inet_ntop.c',
+  ':!compat/inet_pton.c',
+  ':!compat/nedmalloc',
+  ':!compat/obstack.*',
+  ':!compat/poll',
+  ':!compat/regex',
+  ':!sha1collisiondetection',
+  ':!sha1dc',
+  ':!t/unit-tests/clar',
+  ':!t/unit-tests/clar',
+  ':!t/t[0-9][0-9][0-9][0-9]*',
+]
+
+if git.found()
+  headers = []
+  foreach header : run_command(git, '-C', meson.project_source_root(), 'ls-files', '--deduplicate', '*.h', third_party_sources, check: true).stdout().split()
+    headers += header
+  endforeach
+endif
+
 if not get_option('breaking_changes')
   builtin_sources += 'builtin/pack-redundant.c'
 endif

-- 
2.48.1