perl: add support for loongarch64

Config parameters grabbed from standard libraries and existing Perl
build tree. Tested good on both glibc and musl with simple scripts.

Signed-off-by: Xinhui Yang <cyan@cyano.uk>

lang/perl/Makefile

@@ -11,7 +11,7 @@ include perlver.mk
 
 PKG_NAME:=perl
 PKG_VERSION:=$(PERL_VERSION)
-PKG_RELEASE:=6
+PKG_RELEASE:=7
 
 PKG_SOURCE_URL:=https://www.cpan.org/src/5.0
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz

lang/perl/files/loongarch64.config

@@ -0,0 +1,21 @@
+# Architecture definitions
+owrt:arch=loongarch64
+owrt:bits=64
+owrt:endian=little
+
+# Signals, from installed standard headers (asm-generic/signal.h)
+owrt:sig_count=64
+owrt:sigs='ZERO HUP INT QUIT ILL TRAP ABRT BUS FPE KILL USR1 SEGV USR2 PIPE ALRM TERM STKFLT CHLD CONT STOP TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH IO PWR SYS'
+owrt:sig_name_extra='IOT CLD POLL UNUSED'
+owrt:sig_num_extra='6 17 29 31'
+
+# Took from existing Perl 5.40 build.
+d_casti32='define'
+d_long_double_style_ieee='define'
+d_long_double_style_ieee_std='define'
+d_modflproto='define'
+doublekind='3'
+fpossize='16'
+longdblkind='1'
+need_va_copy='undef'
+quadkind='2'