Make gpg-error-config compatible to pkg-config.

* configure.ac (AC_CONFIG_FILES): Generate src/gpg-error.pc, as well
as src/gpg-error-config-old and src/gpg-error-config-new.
* src/Makefile.am (pkgconfigdir, pkgconfig_DATA): New.
(EXTRA_DIST): Add gpg-error-config-new.in, gpg-error-config-test.sh,
and gpg-error.pc.in.
(CLEANFILES): Add gpg-error-config gpg-error-config-test.log.
(TESTS): New.
(gpg-error-config): New target.
* src/gpg-error-config-new.in: New.
* src/gpg-error-config-test.sh: New.
* src/gpg-error.pc.in: New.
* src/gpg-error.m4 (GPG_ERROR_MT_CFLAGS): Use --variable.
(GPG_ERROR_MT_LIBS, gpg_error_config_host): Likewise.

--

This change is to privide gpg-error.pc for pkg-config, so that
developers can use pkg-config to configure their applications.  The
gpg-error-config script is also kept supported for applications which
want to avoid dependency of pkg-config.

Note that new gpg-error-config script uses gpg-error.pc as master
data, so that it can keep compatibility to pkg-config easily.  In the
new gpg-error-config script, features are added to increase
compatibility to pkg-config, like --variable option and multiple
module support.  However, it is not meant to oriented to be a
full-fledged version of pkg-config, only a small set of features is
supported.

To be conservative, new gpg-error-config is checked at build time
against old gpg-error-config.  On the host which fails, old
gpg-error-config will be installed with a warning.

GnuPG-bug-id: 4085
Signed-off-by: NIIBE Yutaka <[email protected]>

1 files changed, 86 insertions, 0 deletions

diff --git a/src/gpg-error-config-test.sh b/src/gpg-error-config-test.sh
new file mode 100755
index 0000000..7f97ead
--- /dev/null
+++ b/src/gpg-error-config-test.sh
@@ -0,0 +1,86 @@
+#!/bin/sh
+
+PKG_CONFIG_PATH="."
+
+export PKG_CONFIG_PATH
+
+if [ "$1" = --old-new ]; then
+    PKG_CONFIG_CMD=./gpg-error-config-old
+else
+    PKG_CONFIG_CMD="pkg-config gpg-error"
+    if ! $PKG_CONFIG_CMD --exists >/dev/null; then
+	exit 77			# Skip tests
+    fi
+fi
+
+test_failed=""
+
+failure () {
+    (
+	echo "Test result: $*"
+	echo "====================: $PKG_CONFIG_CMD"
+	echo "$OUTPUT_OLD"
+	echo "====================: gpg-error-config-new"
+	echo "$OUTPUT_NEW"
+	echo "===================="
+    ) >> gpg-error-config-test.log
+    test_failed=yes
+}
+
+rm -f gpg-error-config-test.log
+
+OUTPUT_OLD=$($PKG_CONFIG_CMD --libs)
+OUTPUT_NEW=$(./gpg-error-config-new --libs)
+[ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --libs
+
+OUTPUT_OLD=$($PKG_CONFIG_CMD --cflags)
+OUTPUT_NEW=$(./gpg-error-config-new --cflags)
+[ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --cflags
+
+OUTPUT_OLD=$($PKG_CONFIG_CMD --cflags --libs)
+OUTPUT_NEW=$(./gpg-error-config-new --cflags --libs)
+[ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --cflags --libs
+
+if [ "$PKG_CONFIG_CMD" = ./gpg-error-config-old ]; then
+    OUTPUT_OLD=$($PKG_CONFIG_CMD --version)
+    OUTPUT_NEW=$(./gpg-error-config-new --version)
+    [ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --version
+
+    OUTPUT_OLD=$($PKG_CONFIG_CMD --mt --libs)
+    OUTPUT_NEW=$(./gpg-error-config-new --mt --libs)
+    [ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --mt --libs
+
+    OUTPUT_OLD=$($PKG_CONFIG_CMD --mt --cflags)
+    OUTPUT_NEW=$(./gpg-error-config-new --mt --cflags)
+    [ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --mt --cflags
+
+    OUTPUT_OLD=$($PKG_CONFIG_CMD --cflags --libs)
+    OUTPUT_NEW=$(./gpg-error-config-new --cflags --libs)
+    [ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --cflags --libs
+
+    OUTPUT_OLD=$($PKG_CONFIG_CMD --mt --cflags --libs)
+    OUTPUT_NEW=$(./gpg-error-config-new --mt --cflags --libs)
+    [ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --mt --cflags --libs
+
+    OUTPUT_OLD=$($PKG_CONFIG_CMD --variable=mtcflags)
+    OUTPUT_NEW=$(./gpg-error-config-new --variable=mtcflags)
+    [ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --variable=mtcflags
+
+    OUTPUT_OLD=$($PKG_CONFIG_CMD --variable=mtlibs)
+    OUTPUT_NEW=$(./gpg-error-config-new --variable=mtlibs)
+    [ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --variable=mtlibs
+
+    OUTPUT_OLD=$($PKG_CONFIG_CMD --variable=host)
+    OUTPUT_NEW=$(./gpg-error-config-new --variable=host)
+    [ "$OUTPUT_OLD" = "$OUTPUT_NEW" ] || failure --variable=host
+fi
+
+if [ -n "$test_failed" ]; then
+    OUTPUT_OLD=$($PKG_CONFIG_CMD --version)
+    OUTPUT_NEW=$(./gpg-error-config-new --version)
+    failure --version
+
+    exit 99
+fi
+
+exit 0