[libxml2] xml2-config: Add a --dynamic switch to print only shared libraries

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 1fc410d3d3cb7cf8ec4181f39dfdd66d39c240eb
Author: Hugh McMaster <hugh mcmaster outlook com>
Date:   Mon Jul 1 22:22:14 2019 +1000

    xml2-config: Add a --dynamic switch to print only shared libraries
    
    `xml2-config --libs` prints static library linking information by default.
    This is un-necessary for most programs, so introduce a new option, --dynamic,
    which, when combined with --libs, only prints shared library linking information.

 Makefile.am    |  1 +
 configure.ac   |  4 +++-
 xml2-config.1  |  1 +
 xml2-config.in | 26 ++++++++++++++------------
 xml2Conf.sh.in |  2 +-
 5 files changed, 20 insertions(+), 14 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 174b9843..d43149fb 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1231,6 +1231,7 @@ xml2Conf.sh: xml2Conf.sh.in Makefile
            -e 's?\@XML_INCLUDEDIR\@?$(XML_INCLUDEDIR)?g' \
            -e 's?\@VERSION\@?$(VERSION)?g' \
            -e 's?\@XML_LIBS\@?$(XML_LIBS)?g' \
+           -e 's?\@XML_PRIVATE_LIBS\@?$(XML_PRIVATE_LIBS)?g' \
               < $(srcdir)/xml2Conf.sh.in > xml2Conf.tmp \
        && mv xml2Conf.tmp xml2Conf.sh
 
diff --git a/configure.ac b/configure.ac
index 9ed3e635..7a76b459 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1533,7 +1533,8 @@ else
         WITH_ICU=1
     fi
 fi
-XML_LIBS="-lxml2 $Z_LIBS $LZMA_LIBS $THREAD_LIBS $ICONV_LIBS $ICU_LIBS $M_LIBS $LIBS"
+XML_LIBS="-lxml2"
+XML_PRIVATE_LIBS="$Z_LIBS $LZMA_LIBS $THREAD_LIBS $ICONV_LIBS $ICU_LIBS $M_LIBS $LIBS"
 XML_LIBTOOLLIBS="libxml2.la"
 AC_SUBST(WITH_ICU)
 
@@ -1678,6 +1679,7 @@ AC_SUBST(XML_CFLAGS)
 
 AC_SUBST(XML_LIBDIR)
 AC_SUBST(XML_LIBS)
+AC_SUBST(XML_PRIVATE_LIBS)
 AC_SUBST(XML_LIBTOOLLIBS)
 AC_SUBST(ICONV_LIBS)
 AC_SUBST(ICU_LIBS)
diff --git a/xml2-config.1 b/xml2-config.1
index 8cf9858b..4dec38f9 100644
--- a/xml2-config.1
+++ b/xml2-config.1
@@ -16,6 +16,7 @@ Print the currently installed version of \fIGNOME-XML\fP on the standard output.
 .TP 8
 .B  \-\-libs
 Print the linker flags that are necessary to link a \fIGNOME-XML\fP program.
+Add \-\-dynamic after --libs to print only shared library linking information.
 .TP 8
 .B  \-\-cflags
 Print the compiler flags that are necessary to compile a \fIGNOME-XML\fP program.
diff --git a/xml2-config.in b/xml2-config.in
index 19574864..6b87fc8c 100644
--- a/xml2-config.in
+++ b/xml2-config.in
@@ -15,6 +15,7 @@ Known values for OPTION are:
   --prefix=DIR         change libxml prefix [default $prefix]
   --exec-prefix=DIR    change libxml exec prefix [default $exec_prefix]
   --libs               print library linking information
+                        add --dynamic to print only shared libraries
   --cflags             print pre-processor and compiler flags
   --modules            module support enabled
   --help               display this help and exit
@@ -82,18 +83,19 @@ while test $# -gt 0; do
                ;;
 
     --libs)
-        if [ "`uname`" = "Linux" ]
-       then
-           if [ "@XML_LIBDIR@" = "-L/usr/lib" -o "@XML_LIBDIR@" = "-L/usr/lib64" ]
-           then
-               echo @XML_LIBS@ @MODULE_PLATFORM_LIBS@
-           else
-               echo @XML_LIBDIR@ @XML_LIBS@ @MODULE_PLATFORM_LIBS@
-           fi
-       else
-           echo @XML_LIBDIR@ @XML_LIBS@ @MODULE_PLATFORM_LIBS@ @WIN32_EXTRA_LIBADD@
-       fi
-               ;;
+        if [ "$2" = "--dynamic" ]; then
+            shift
+            LIBS="@XML_LIBS@"
+        else
+            LIBS="@XML_LIBS@ @XML_PRIVATE_LIBS@ @MODULE_PLATFORM_LIBS@"
+        fi
+
+        if [ "@XML_LIBDIR@" != "-L/usr/lib" -a "@XML_LIBDIR@" != "-L/usr/lib64" ]; then
+            LIBS="@XML_LIBDIR@ $LIBS"
+        fi
+
+        echo ${LIBS} @WIN32_EXTRA_LIBADD@
+        ;;
 
     *)
        usage
diff --git a/xml2Conf.sh.in b/xml2Conf.sh.in
index 08cb2334..31228c0b 100644
--- a/xml2Conf.sh.in
+++ b/xml2Conf.sh.in
@@ -2,7 +2,7 @@
 # Configuration file for using the XML library in GNOME applications
 #
 XML2_LIBDIR="@XML_LIBDIR@"
-XML2_LIBS="@XML_LIBS@"
+XML2_LIBS="@XML_LIBS@ @XML_PRIVATE_LIBS@"
 XML2_INCLUDEDIR="@XML_INCLUDEDIR@"
 MODULE_VERSION="xml2-@VERSION@"