apr: Use correct strerror_r implementation based on libc type

musl does not implement GNU extention of strerror_r but XSI compliant
version, therefore add it via a packageconfig to set right variables
during configure to cache the value.

configure detection logic depends on runtime test which will always be
wrong on cross compiles therefore backport a patch to make it possible
to cache the needed configure variable.

(From OE-Core rev: ded3d76a844dd1aef9ac610fbe506bf76285369b)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/apr/apr/0001-add-AC_CACHE_CHECK-for-strerror_r-return-type.patch

@@ -0,0 +1,52 @@
+From 8ca3c3306f1a149e51a3be6a4b1e47e9aee88262 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Tue, 23 Aug 2022 22:42:03 -0700
+Subject: [PATCH] add AC_CACHE_CHECK for strerror_r return type
+
+APR's configure script uses AC_TRY_RUN to detect whether the return type
+of strerror_r is int. When cross-compiling this defaults to no.
+
+This commit adds an AC_CACHE_CHECK so users who cross-compile APR may
+influence the outcome with a configure variable.
+
+Upstream-Status: Backport [https://svn.apache.org/viewvc?view=revision&revision=1875065]
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ build/apr_common.m4 | 11 ++++-------
+ 1 file changed, 4 insertions(+), 7 deletions(-)
+
+diff --git a/build/apr_common.m4 b/build/apr_common.m4
+index cbf2a4c..42e75cf 100644
+--- a/build/apr_common.m4
++++ b/build/apr_common.m4
+@@ -525,8 +525,9 @@ dnl  string.
+ dnl
+ dnl
+ AC_DEFUN([APR_CHECK_STRERROR_R_RC], [
+-AC_MSG_CHECKING(for type of return code from strerror_r)
+-AC_TRY_RUN([
++AC_CACHE_CHECK([whether return code from strerror_r has type int],
++[ac_cv_strerror_r_rc_int],
++[AC_TRY_RUN([
+ #include <errno.h>
+ #include <string.h>
+ #include <stdio.h>
+@@ -542,14 +543,10 @@ main()
+ }], [
+     ac_cv_strerror_r_rc_int=yes ], [
+     ac_cv_strerror_r_rc_int=no ], [
+-    ac_cv_strerror_r_rc_int=no ] )
++    ac_cv_strerror_r_rc_int=no ] ) ] )
+ if test "x$ac_cv_strerror_r_rc_int" = xyes; then
+   AC_DEFINE(STRERROR_R_RC_INT, 1, [Define if strerror returns int])
+-  msg="int"
+-else
+-  msg="pointer"
+ fi
+-AC_MSG_RESULT([$msg])
+ ] )
+ 
+ dnl
+-- 
+2.37.2
+

meta/recipes-support/apr/apr_1.7.0.bb

@@ -24,6 +24,7 @@ SRC_URI = "${APACHE_MIRROR}/apr/${BPN}-${PV}.tar.bz2 \
            file://libtoolize_check.patch \
            file://0001-Add-option-to-disable-timed-dependant-tests.patch \
            file://autoconf270.patch \
+           file://0001-add-AC_CACHE_CHECK-for-strerror_r-return-type.patch \
            file://CVE-2021-35940.patch \
            "
 
@@ -44,9 +45,12 @@ CACHED_CONFIGUREVARS += "ac_cv_header_netinet_sctp_h=no ac_cv_header_netinet_sct
 CACHED_CONFIGUREVARS += "ac_cv_sizeof_struct_iovec=yes"
 CACHED_CONFIGUREVARS += "ac_cv_file__dev_zero=yes"
 
+CACHED_CONFIGUREVARS:append:libc-musl = " ac_cv_strerror_r_rc_int=yes"
 PACKAGECONFIG ??= "${@bb.utils.filter('DISTRO_FEATURES', 'ipv6', d)}"
+PACKAGECONFIG:append:libc-musl = " xsi-strerror"
 PACKAGECONFIG[ipv6] = "--enable-ipv6,--disable-ipv6,"
 PACKAGECONFIG[timed-tests] = "--enable-timed-tests,--disable-timed-tests,"
+PACKAGECONFIG[xsi-strerror] = "ac_cv_strerror_r_rc_int=yes,ac_cv_strerror_r_rc_int=no,"
 
 do_configure:prepend() {
 	# Avoid absolute paths for grep since it causes failures