[openwrt/openwrt] dosfstools: switch to AC_CHECK_LIB

[LEDE Commits]

blocktrron pushed a commit to openwrt/openwrt.git, branch openwrt-22.03:
https://git.openwrt.org/807483d3365f3dd011e3790695512d443cf2f267

commit 807483d3365f3dd011e3790695512d443cf2f267
Author: David Bauer <mail at david-bauer.net>
AuthorDate: Mon Jan 16 01:30:29 2023 +0100

    dosfstools: switch to AC_CHECK_LIB
    
    This fixes spurious build-errors on OpenWrt, where the AM_ICONV macro
    is undefined while invoking autoconfig. Later in the build, the ICONV
    LDOPTIONS are set to @LIBICONV@, failing the build.
    
    Signed-off-by: David Bauer <mail at david-bauer.net>
    (cherry picked from commit 9300a20dcce2217b121bd2020cc1a4ea41fa4475)
---
 .../101-config-switch-to-AC_CHECK_LIB.patch        | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tools/dosfstools/patches/101-config-switch-to-AC_CHECK_LIB.patch b/tools/dosfstools/patches/101-config-switch-to-AC_CHECK_LIB.patch
new file mode 100644
index 0000000000..ba2d00bf84
--- /dev/null
+++ b/tools/dosfstools/patches/101-config-switch-to-AC_CHECK_LIB.patch
@@ -0,0 +1,28 @@
+From e7671c2a3be03d790cbc225cd3e784b5434fb5da Mon Sep 17 00:00:00 2001
+From: David Bauer <mail at david-bauer.net>
+Date: Mon, 16 Jan 2023 01:29:22 +0100
+Subject: [PATCH] config: switch to AC_CHECK_LIB
+
+This fixes spurious build-errors on OpenWrt, where the AM_ICONV macro
+is undefined while invoking autoconfig. Later in the build, the ICONV
+LDOPTIONS are set to @LIBICONV@, failing the build.
+
+Signed-off-by: David Bauer <mail at david-bauer.net>
+---
+ configure.ac | 5 +----
+ 1 file changed, 1 insertion(+), 4 deletions(-)
+
+--- a/configure.ac
++++ b/configure.ac
+@@ -70,10 +70,7 @@ AC_CHECK_DECLS([getmntent], [], [], [[#i
+ AC_CHECK_DECLS([getmntinfo], [], [], [[#include <sys/mount.h>]])
+ 
+ # optional iconv support
+-AC_ARG_WITH([iconv], AS_HELP_STRING([--without-iconv], [build without iconv support]))
+-if test "x$with_iconv" != "xno"; then
+-	AM_ICONV
+-fi
++AC_CHECK_LIB(iconv, iconv_open)
+ 
+ # xxd (distributed with vim) is used in the testsuite
+ AC_CHECK_PROG([XXD_FOUND], [xxd], [yes])