From e1c7b8ad61a213014ae3bf87db197301ab2bac29 Mon Sep 17 00:00:00 2001
From: Po Lu <luangruo@yahoo.com>
Date: Mon, 6 Feb 2023 22:26:45 +0800
Subject: [PATCH] Adjust ndk-build implementation for old NDK versions

* configure.ac: Pass ANDROID_CFLAGS to ndk_INIT.
* cross/ndk-build/Makefile.in (NDK_BUILD_CFLAGS):
* cross/ndk-build/ndk-build-shared-library.mk
($(call objname,$(LOCAL_MODULE),$(basename $(1)))):
($$(error Unsupported suffix):
* cross/ndk-build/ndk-build-static-library.mk
($(call objname,$(LOCAL_MODULE),$(basename $(1)))):
($$(error Unsupported suffix): Use NDK_BUILD_CFLAGS.
* m4/ndk-build.m4 (ndk_INIT): Accept cflags.
(ndk_CONFIG_FILES): Export NDK_BUILD_CFLAGS.
---
 configure.ac                                | 5 ++++-
 cross/ndk-build/Makefile.in                 | 1 +
 cross/ndk-build/ndk-build-shared-library.mk | 6 +++---
 cross/ndk-build/ndk-build-static-library.mk | 6 +++---
 m4/ndk-build.m4                             | 8 ++++++--
 5 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/configure.ac b/configure.ac
index b8ce7840797..09ff1a845be 100644
--- a/configure.ac
+++ b/configure.ac
@@ -169,8 +169,11 @@ AC_CANONICAL_BUILD
 if test "$XCONFIGURE" = "android"; then
   # Initialize the Android NDK build system.  Make sure to use the
   # passed through NDK path.
+  # Make sure to pass through the CFLAGS, as older versions of the
+  # NDK require them to be able to find system includes.
   with_ndk_path="$android_ndk_path"
-  ndk_INIT([$android_abi], [$ANDROID_SDK], [cross/ndk-build])
+  ndk_INIT([$android_abi], [$ANDROID_SDK], [cross/ndk-build],\
+           [$ANDROID_CFLAGS])
 fi
 
 case $host in
diff --git a/cross/ndk-build/Makefile.in b/cross/ndk-build/Makefile.in
index 774858697b4..738a70a2f28 100644
--- a/cross/ndk-build/Makefile.in
+++ b/cross/ndk-build/Makefile.in
@@ -31,6 +31,7 @@ NDK_BUILD_ANDROID_MK = @NDK_BUILD_ANDROID_MK@
         NDK_BUILD_CC = @NDK_BUILD_CC@
         NDK_BUILD_AR = @NDK_BUILD_AR@
       NDK_BUILD_NASM = @NDK_BUILD_NASM@
+    NDK_BUILD_CFLAGS = @NDK_BUILD_CFLAGS@
 
 # This is a list of targets to build.
    NDK_BUILD_MODULES = @NDK_BUILD_MODULES@
diff --git a/cross/ndk-build/ndk-build-shared-library.mk b/cross/ndk-build/ndk-build-shared-library.mk
index be4d16cb4ed..44d5bbb1991 100644
--- a/cross/ndk-build/ndk-build-shared-library.mk
+++ b/cross/ndk-build/ndk-build-shared-library.mk
@@ -35,13 +35,13 @@ define single-object-target
 ifeq (x$(suffix $(1)),x.c)
 
 $(call objname,$(LOCAL_MODULE),$(basename $(1))): $(LOCAL_PATH)/$(1)
-	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_CFLAGS_$(LOCAL_MODULE)) $(call LOCAL_C_ADDITIONAL_FLAGS,$(1))
+	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_CFLAGS_$(LOCAL_MODULE)) $(NDK_BUILD_CFLAGS) $(call LOCAL_C_ADDITIONAL_FLAGS,$(1))
 
 else
 ifeq (x$(suffix $(1)),x.$(or $(LOCAL_CPP_EXTENSION),cpp))
 
 $(call objname,$(LOCAL_MODULE),$(basename $(1))): $(LOCAL_PATH)/$(1)
-	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_CFLAGS_$(LOCAL_MODULE)) $(NDK_CXXFLAGS_$(LOCAL_MODULE))
+	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_CFLAGS_$(LOCAL_MODULE)) $(NDK_BUILD_CFLAGS) $(NDK_CXXFLAGS_$(LOCAL_MODULE))
 
 else
 ifneq ($(or $(call eq,x$(suffix $(1)),x.s),$(call eq,x$(suffix $(1)),x.S)),)
@@ -54,7 +54,7 @@ ifneq (x$(suffix $(1)),x.asm)
 ifeq (x$(suffix $(1)),x.cc)
 
 $(call objname,$(LOCAL_MODULE),$(basename $(1))): $(LOCAL_PATH)/$(1)
-	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_CFLAGS_$(LOCAL_MODULE)) $(NDK_CXXFLAGS_$(LOCAL_MODULE))
+	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_CFLAGS_$(LOCAL_MODULE)) $(NDK_BUILD_CFLAGS) $(NDK_CXXFLAGS_$(LOCAL_MODULE))
 
 else
 $$(error Unsupported suffix: $(suffix $(1)))
diff --git a/cross/ndk-build/ndk-build-static-library.mk b/cross/ndk-build/ndk-build-static-library.mk
index ebcc3cd531d..c1584e789a7 100644
--- a/cross/ndk-build/ndk-build-static-library.mk
+++ b/cross/ndk-build/ndk-build-static-library.mk
@@ -27,13 +27,13 @@ define single-object-target
 ifeq (x$(suffix $(1)),x.c)
 
 $(call objname,$(LOCAL_MODULE),$(basename $(1))): $(LOCAL_PATH)/$(1)
-	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_CFLAGS_$(LOCAL_MODULE)) $(call LOCAL_C_ADDITIONAL_FLAGS,$(1))
+	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_BUILD_CFLAGS) $(NDK_CFLAGS_$(LOCAL_MODULE)) $(call LOCAL_C_ADDITIONAL_FLAGS,$(1))
 
 else
 ifeq (x$(suffix $(1)),x.$(or $(LOCAL_CPP_EXTENSION),cpp))
 
 $(call objname,$(LOCAL_MODULE),$(basename $(1))): $(LOCAL_PATH)/$(1)
-	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_CFLAGS_$(LOCAL_MODULE)) $(NDK_CXXFLAGS_$(LOCAL_MODULE))
+	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_BUILD_CFLAGS) $(NDK_CFLAGS_$(LOCAL_MODULE)) $(NDK_CXXFLAGS_$(LOCAL_MODULE))
 
 else
 ifneq ($(or $(call eq,x$(suffix $(1)),x.s),$(call eq,x$(suffix $(1)),x.S)),)
@@ -46,7 +46,7 @@ ifneq (x$(suffix $(1)),x.asm)
 ifeq (x$(suffix $(1)),x.cc)
 
 $(call objname,$(LOCAL_MODULE),$(basename $(1))): $(LOCAL_PATH)/$(1)
-	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_CFLAGS_$(LOCAL_MODULE)) $(NDK_CXXFLAGS_$(LOCAL_MODULE))
+	$(NDK_BUILD_CC) -c $$< -o $$@ $(NDK_BUILD_CFLAGS) $(NDK_CFLAGS_$(LOCAL_MODULE)) $(NDK_CXXFLAGS_$(LOCAL_MODULE))
 
 else
 $$(error Unsupported suffix: $(suffix $(1)))
diff --git a/m4/ndk-build.m4 b/m4/ndk-build.m4
index 888b587af02..876c980ebb5 100644
--- a/m4/ndk-build.m4
+++ b/m4/ndk-build.m4
@@ -25,10 +25,11 @@ AC_ARG_WITH([ndk_cxx_shared],
   [AS_HELP_STRING([--with-ndk-cxx-shared],
     [name of the C++ standard library included with the NDK])])
 
-# ndk_INIT(ABI, API, DIR)
-# --------
+# ndk_INIT(ABI, API, DIR, CFLAGS)
+# -------------------------------
 # Initialize the Android NDK.  ABI is the ABI being built for.
 # API is the API version being built for.
+# CFLAGS is a list of compiler flags.
 # As a side effect, set the variable ndk_INITIALIZED to true.
 # DIR should be a directory containing the Makefile.in actually
 # implementing the Android NDK build system.
@@ -50,6 +51,7 @@ ndk_INITIALIZED=yes
 ndk_API=$2
 ndk_DIR=$3
 ndk_ANY_CXX=
+ndk_BUILD_CFLAGS="$4"
 
 case "$ndk_ABI" in
  *arm64* )
@@ -370,6 +372,7 @@ AC_DEFUN_ONCE([ndk_CONFIG_FILES],
     NDK_BUILD_MODULES="$ndk_MODULES"
     NDK_BUILD_CXX_SHARED="$ndk_CXX_SHARED"
     NDK_BUILD_ANY_CXX_MODULE=$ndk_ANY_CXX
+    NDK_BUILD_CFLAGS="$ndk_BUILD_CFLAGS"
 
     AC_SUBST([NDK_BUILD_ANDROID_MK])
     AC_SUBST([NDK_BUILD_ARCH])
@@ -381,6 +384,7 @@ AC_DEFUN_ONCE([ndk_CONFIG_FILES],
     AC_SUBST([NDK_BUILD_MODULES])
     AC_SUBST([NDK_BUILD_CXX_SHARED])
     AC_SUBST([NDK_BUILD_ANY_CXX_MODULE])
+    AC_SUBST([NDK_BUILD_CFLAGS])
 
     AC_CONFIG_FILES([$ndk_DIR/Makefile])
     AC_CONFIG_FILES([$ndk_DIR/ndk-build.mk])
-- 
2.39.5