From 278d894146c047452e7145cbfc34c00742f46108 Mon Sep 17 00:00:00 2001
From: Matt Turner <mattst88@gmail.com>
Date: Wed, 21 May 2025 11:15:46 -0400
Subject: [PATCH] meson: add wrap for libdrm

This allows building Mesa with the Android NDK, which doesn't provide
libdrm.

We will generate an `Android.bp` file using the `ninja-to-soong` tool
(https://github.com/rjodinchr/ninja-to-soong), and to do this we run
Mesa's standard meson build system to generate the ninja commands that
we then translate to soong.

That meson invocation is done using the Android NDK, which doesn't
provide libdrm, so until we find an alternative solution[*] we provide a
wrap file that builds libdrm as part of the Mesa build (but does not
install it--we still use the Android-provided libdrm at runtime)

Co-authored-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35058>
---
 meson.build             | 11 +++++++++--
 meson.options           | 10 ++++++++++
 subprojects/libdrm.wrap |  6 ++++++
 3 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 subprojects/libdrm.wrap

diff --git a/meson.build b/meson.build
index 0a227880e4f..277a7842c46 100644
--- a/meson.build
+++ b/meson.build
@@ -1670,12 +1670,18 @@ if _drm_blame != ''
   message('libdrm @0@ needed because @1@ has the highest requirement'.format(_drm_ver, _drm_blame))
 endif
 
+allow_fallback_for_libdrm = get_option('allow-fallback-for').contains('libdrm')
+
 # Then get each libdrm module
 foreach d : _libdrm_checks
   if d[1]
     set_variable(
       'dep_libdrm_' + d[0],
-      dependency('libdrm_' + d[0], version : '>=' + _drm_ver)
+      dependency(
+        'libdrm_' + d[0],
+        version : '>=' + _drm_ver,
+        allow_fallback: allow_fallback_for_libdrm,
+      )
     )
   endif
 endforeach
@@ -1684,7 +1690,8 @@ with_gallium_drisw_kms = false
 if system_has_kms_drm
   dep_libdrm = dependency(
     'libdrm', version : '>=' + _drm_ver,
-    required : with_dri2 or with_dri or with_gbm
+    required : with_dri2 or with_dri or with_gbm,
+    allow_fallback: allow_fallback_for_libdrm,
   )
 else
   # We should prevent libdrm from being available when the target doesn't have it to avoid transitive
diff --git a/meson.options b/meson.options
index ded6649d511..5fd5102d3fb 100644
--- a/meson.options
+++ b/meson.options
@@ -832,3 +832,13 @@ option(
   value : false,
   description : 'Install the drivers internal shader compilers (if needed for cross builds).'
 )
+
+option(
+  'allow-fallback-for',
+  type : 'array',
+  value : [],
+  choices : [
+    'libdrm',
+  ],
+  description : 'Allows the fallback mechanism if the dependency is not available on the system, or too old.'
+)
diff --git a/subprojects/libdrm.wrap b/subprojects/libdrm.wrap
new file mode 100644
index 00000000000..9fbfeadfc9e
--- /dev/null
+++ b/subprojects/libdrm.wrap
@@ -0,0 +1,6 @@
+[wrap-file]
+directory = libdrm-2.4.123
+source_url = https://dri.freedesktop.org/libdrm/libdrm-2.4.123.tar.xz
+source_filename = libdrm-2.4.123.tar.xz
+source_hash = a2b98567a149a74b0f50e91e825f9c0315d86e7be9b74394dae8b298caadb79e
+wrapdb_version = 2.4.123-1