buildroot/package/perl/0004-suppress-built-in-functions-to-avoid-false-positives.patch

suppress built-in functions to avoid false positives

gcc knows j0 etc. are pure and excludes them from try.c, subverting
linkage test against libm.a and leading to link errors later.

Fetch from: http://github.com/arsv/perl-cross/commit/ce7fa56d3a40767135039e03517a4d9ef2f3aaa1
See discussion: https://github.com/arsv/perl-cross/issues/18

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>

--- a/cnf/configure__f.sh
+++ b/cnf/configure__f.sh
@@ -222,7 +222,7 @@ function try_link_libs {
 }

 function try_link {
-	try_link_libs $libs
+	try_link_libs $libs $*
 }

 function try_readelf {
--- a/cnf/configure_func.sh
+++ b/cnf/configure_func.sh
@@ -22,7 +22,7 @@ function hasfunc {
 		esac ;;
 	esac
 	try_add "int main(void) { $1($2); return 0; }"
-	try_link
+	try_link -O0 -fno-builtin
 	resdef 'found' 'not found' "$_s"
 }