build system: config-time test framework: added cfgtest_decl_presence.

1 files changed, 33 insertions, 0 deletions

diff --git a/sofort/cfgtest.sh b/sofort/cfgtest.sh
index bd661c0..57aca7c 100644
--- a/sofort/cfgtest.sh
+++ b/sofort/cfgtest.sh
@@ -157,6 +157,39 @@ cfgtest_interface_presence()
 	return 0
 }
 
+
+cfgtest_decl_presence()
+{
+	mb_internal_cflags=''
+
+	for mb_header in $mb_cfgtest_headers; do
+		mb_internal_cflags="$mb_internal_cflags --include=$mb_header"
+	done
+
+	printf 'void * any = (void *)%s;' "$@"            \
+			| $mb_cfgtest_cc -S -xc - -o -    \
+			  $mb_cfgtest_cflags              \
+			  $mb_internal_cflags             \
+                > /dev/null 2>/dev/null                   \
+	|| return 1
+
+	# does the argument solely consist of the macro or enum member name?
+	mb_internal_str=$(printf '%s' "$@" | tr -d '[a-z][A-Z][0-9][_]')
+
+	if [ -n "$mb_internal_str" ]; then
+		return 0
+	fi
+
+	mb_internal_str=$(printf '%s%s' '-DHAVE_DECL_' "$@"  \
+			| sed -e 's/\./_/g'                  \
+			| tr "[:lower:]" "[:upper:]")
+
+	cfgtest_cflags_append "$mb_internal_str"
+
+	return 0
+}
+
+
 cfgtest_library_presence()
 {
 	printf 'int main(void){return 0;}'                \