libxml2: use xml2-config dummy for internal build

When building a static LO with --disable-dynloading on Linux,
--without-system-libs failed for me. And it left me really puzzled:
raptor configure failed and claimed it couldn't link libxml2.

raptor's config.log showed missing math functions. xml2-config of
LO's build is patched and it includes a -lm. The xml2-config in my
chroot doesn't. But we explicitly pass the xml2-config for
non-system-libxml2 build. Reading the configure from raptor didn't
reveal a way, that it could somehow pick up the xml2-config from
the chroot, but that code is autoconf-complex...

When running "sh -x configure", it turned out the configure script
actually picks up the LIBXML_* flags from the environment, which
are set by LO's config_host.mk. These just add -lm for Android.

So this adds a xml2-config.in "dummy", which overwrites the one
from the libxml2 source and just echos LO's LIBXML_* values and
it adds -lm for all DISABLE_DYNLOADING targets.

Change-Id: Ia713cf80c8e7dc989cf23c224e7a0f7ea1210a87
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/116409
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
(cherry picked from commit 8b9f8f0f9d38cc64f742fe5358fce88d0f82391a)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/139965
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
(cherry picked from commit 5c044ae7a3246bddbd0513bd5ed3efef10cb1503)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/140006
Tested-by: Thorsten Behrens <thorsten.behrens@allotropia.de>
Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>

3 files changed, 30 insertions, 44 deletions

diff --git a/external/libxml2/UnpackedTarball_libxml2.mk b/external/libxml2/UnpackedTarball_libxml2.mk
index 00398f16af56..4ec3fa074dea 100644
--- a/external/libxml2/UnpackedTarball_libxml2.mk
+++ b/external/libxml2/UnpackedTarball_libxml2.mk
@@ -14,11 +14,12 @@ $(eval $(call gb_UnpackedTarball_set_tarball,libxml2,$(LIBXML_TARBALL),,libxml2)
 $(eval $(call gb_UnpackedTarball_update_autoconf_configs,libxml2))
 
 $(eval $(call gb_UnpackedTarball_add_patches,libxml2,\
-	external/libxml2/libxml2-config.patch.1 \
 	external/libxml2/libxml2-global-symbols.patch \
 	external/libxml2/libxml2-vc10.patch \
 	$(if $(filter ANDROID,$(OS)),external/libxml2/libxml2-android.patch) \
 	external/libxml2/libxml2-icu.patch.0 \
 ))
 
+$(eval $(call gb_UnpackedTarball_add_file,libxml2,xml2-config.in,external/libxml2/xml2-config.in))
+
 # vim: set noet sw=4 ts=4:
diff --git a/external/libxml2/libxml2-config.patch.1 b/external/libxml2/libxml2-config.patch.1
deleted file mode 100644
index 5a2ef1485e92..000000000000
--- a/external/libxml2/libxml2-config.patch.1
+++ /dev/null
@@ -1,43 +0,0 @@
-Hack the xml2-config to return paths into WORKDIR.
-
---- a/xml2-config.in	2009-12-17 11:45:20.000000000 +0000
-+++ b/xml2-config.in	2009-12-17 11:45:36.000000000 +0000
-@@ -1,9 +1,14 @@
- #! /bin/sh
- 
--prefix=@prefix@
--exec_prefix=@exec_prefix@
--includedir=@includedir@
--libdir=@libdir@
-+#prefix=@prefix@
-+#exec_prefix=@exec_prefix@
-+#includedir=@includedir@
-+#libdir=@libdir@
-+
-+prefix=${WORKDIR}/UnpackedTarball/libxml2
-+exec_prefix=${WORKDIR}/UnpackedTarball/libxml2
-+includedir=${WORKDIR}/UnpackedTarball/libxml2/include
-+libdir=${WORKDIR}/UnpackedTarball/libxml2/.libs
- cflags=
- libs=
- 
-@@ -67,7 +72,8 @@
- 	;;
- 
-     --cflags)
--        cflags="@XML_INCLUDEDIR@ @XML_CFLAGS@"
-+        #cflags="@XML_INCLUDEDIR@ @XML_CFLAGS@"
-+        cflags="-I${includedir}"
-        	;;
- 
-     --libtool-libs)
-@@ -91,7 +96,8 @@
-             libs="@XML_LIBDIR@ $libs"
-         fi
- 
--        libs="$libs @WIN32_EXTRA_LIBADD@"
-+        #libs="$libs @WIN32_EXTRA_LIBADD@"
-+        libs="-L${libdir} -lxml2 -lm"
-         ;;
- 
-     *)
diff --git a/external/libxml2/xml2-config.in b/external/libxml2/xml2-config.in
new file mode 100644
index 000000000000..164508e47e67
--- /dev/null
+++ b/external/libxml2/xml2-config.in
@@ -0,0 +1,28 @@
+#! /bin/sh
+
+while test $# -gt 0; do
+    case "$1" in
+    -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
+    *) optarg= ;;
+    esac
+
+    case "$1" in
+    --version)
+	echo @VERSION@
+	exit 0
+        ;;
+    --cflags)
+        cflags="$LIBXML_CFLAGS"
+        ;;
+    --libs)
+        libs="$LIBXML_LIBS"
+        ;;
+    esac
+    shift
+done
+
+if test -n "$cflags$libs"; then
+    echo $cflags $libs
+fi
+
+exit 0