check: Test -uninstalled functionality

Test the usage of -uninstalled packages with two .pc files: inst.pc and
inst-uninstalled.pc. pkg-config should prefer the -uninstalled version
unless PKG_CONFIG_DISABLE_UNINSTALLED is set. It should also use the
default value of pc_top_builddir unless PKG_CONFIG_TOP_BUILD_DIR is set.

check/Makefile.am

@@ -16,7 +16,8 @@ TESTS = \
 	check-version \
 	check-print-options \
 	check-path \
-	check-sysroot
+	check-sysroot \
+	check-uninstalled
 
 EXTRA_DIST = \
 	$(TESTS) \
@@ -33,4 +34,6 @@ EXTRA_DIST = \
 	whitespace.pc \
 	fields-blank.pc \
 	sub/sub1.pc \
-	sub/sub2.pc
+	sub/sub2.pc \
+	inst.pc \
+	inst-uninstalled.pc

check/check-uninstalled

@@ -0,0 +1,46 @@
+#! /bin/sh
+
+set -e
+
+. ${srcdir}/common
+
+# Check to see if we find the uninstalled version
+RESULT=''
+run_test --uninstalled inst
+
+RESULT=''
+run_test --exists inst \>= 2.0
+
+RESULT='-I$(top_builddir)/include'
+run_test --cflags inst
+
+RESULT='-L$(top_builddir)/lib -linst'
+run_test --libs inst
+
+# Alter PKG_CONFIG_TOP_BUILD_DIR
+export PKG_CONFIG_TOP_BUILD_DIR='$(abs_top_builddir)'
+
+RESULT='-I$(abs_top_builddir)/include'
+run_test --cflags inst
+
+RESULT='-L$(abs_top_builddir)/lib -linst'
+run_test --libs inst
+
+unset PKG_CONFIG_TOP_BUILD_DIR
+
+# Check to see if we get the original back
+export PKG_CONFIG_DISABLE_UNINSTALLED=1
+
+RESULT=''
+EXPECT_RETURN=1 run_test --uninstalled inst
+
+RESULT=''
+EXPECT_RETURN=1 run_test --exists inst \>= 2.0
+
+RESULT='-I/inst/include'
+run_test --cflags inst
+
+RESULT='-L/inst/lib -linst'
+run_test --libs inst
+
+unset PKG_CONFIG_DISABLE_UNINSTALLED

check/inst-uninstalled.pc

@@ -0,0 +1,11 @@
+prefix=${pc_top_builddir}
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: Uninstalled test package
+Description: Test package for checking -uninstalled behavior
+Version: 2.0.0
+Requires:
+Libs: -L${libdir} -linst
+Cflags: -I${includedir}

check/inst.pc

@@ -0,0 +1,11 @@
+prefix=/inst
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: Installed test package
+Description: Test package for checking -uninstalled behavior
+Version: 1.0.0
+Requires:
+Libs: -L${libdir} -linst
+Cflags: -I${includedir}