check: More thoroughly test variable usage

Add some more tests for handling unusual variables such as those that
are quoted or that contain shell characters. This should help make the
--variable output more reliable in the future.

https://bugs.freedesktop.org/show_bug.cgi?id=93284

check/Makefile.am

@@ -28,6 +28,7 @@ TESTS = \
 	check-tilde \
 	check-relocatable \
 	check-variable-override \
+	check-variables \
 	$(NULL)
 
 EXTRA_DIST = \
@@ -99,4 +100,6 @@ EXTRA_DIST = \
 	tilde.pc \
 	pkgconfig/prefixdef.pc \
 	pkgconfig/prefixdef-expanded.pc \
-	pcfiledir.pc
+	pcfiledir.pc \
+	variables.pc \
+	$(NULL)

check/check-variables

@@ -0,0 +1,18 @@
+#! /bin/sh
+
+set -e
+
+. ${srcdir}/common
+
+# Check quoted variables are stripped. In 0.28 and earlier, this would
+# contain the "" quotes.
+RESULT='/local/include'
+run_test --variable=includedir variables
+
+# Non-quoted variables are output as is. In 0.29, the \ would be stripped.
+RESULT='-I"/local/include"/foo  -DFOO=\"/bar\"'
+run_test --variable=cppflags variables
+
+# Check the entire cflags output
+RESULT='-DFOO=\"/bar\" -I/local/include -I/local/include/foo'
+run_test --cflags variables

check/check-whitespace

@@ -4,6 +4,11 @@ set -e
 
 . ${srcdir}/common
 
+# variables come out unquoted. In 0.28 and earlier, this would also
+# contain the ""s quoting the variable.
+RESULT='/usr/white space/include'
+run_test --variable=includedir whitespace
+
 # expect cflags from whitespace
 RESULT='-Dlala=misc -I/usr/white\ space/include -I$(top_builddir) -Iinclude\ dir -Iother\ include\ dir'
 run_test --cflags whitespace

check/variables.pc

@@ -0,0 +1,11 @@
+prefix=/local
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir="${prefix}/include"
+cppflags=-I${includedir}/foo \
+ -DFOO=\"/bar\"
+
+Name: Complex variables
+Description: Test complex variable output
+Version: 1.0
+Cflags: -I${includedir} ${cppflags}