gh-90656: Add platform triplets for 64-bit LoongArch (LA64) (#30939)

Signed-off-by: Zhang Na <[email protected]>
Co-authored-by: WANG Xuerui <[email protected]>

Author: loongson-zn

Doc/whatsnew/3.12.rst

@@ -1169,6 +1169,14 @@ Build Changes
   optimization levels (0, 1, 2) at once.
   (Contributed by Victor Stinner in :gh:`99289`.)
 
+* Add platform triplets for 64-bit LoongArch:
+
+  * loongarch64-linux-gnusf
+  * loongarch64-linux-gnuf32
+  * loongarch64-linux-gnu
+
+  (Contributed by Zhang Na in :gh:`90656`.)
+
 
 C API Changes
 =============

Misc/NEWS.d/next/Build/2022-06-20-15-15-11.gh-issue-90656.kFBbKe.rst

@@ -0,0 +1,7 @@
+Add platform triplets for 64-bit LoongArch:
+
+* loongarch64-linux-gnusf
+* loongarch64-linux-gnuf32
+* loongarch64-linux-gnu
+
+Patch by Zhang Na.

configure

@@ -959,6 +959,20 @@ cat > conftest.c <<EOF
         hppa-linux-gnu
 # elif defined(__ia64__)
         ia64-linux-gnu
+# elif defined(__loongarch__)
+#  if defined(__loongarch_lp64)
+#   if defined(__loongarch_soft_float)
+        loongarch64-linux-gnusf
+#   elif defined(__loongarch_single_float)
+        loongarch64-linux-gnuf32
+#   elif defined(__loongarch_double_float)
+        loongarch64-linux-gnu
+#   else
+#    error unknown platform triplet
+#   endif
+#  else
+#   error unknown platform triplet
+#  endif
 # elif defined(__m68k__) && !defined(__mcoldfire__)
         m68k-linux-gnu
 # elif defined(__mips_hard_float) && defined(__mips_isa_rev) && (__mips_isa_rev >=6) && defined(_MIPSEL)