[pacman] 7.0.0-9: Remove -fno-plt on unsupported architectures

LLVM doesn't support -fno-plt on RISC-V and LoongArch and starts
emitting a warning if it's supplied on unsupported targets since LLVM
20, causing various errors when configuring packages. Let's remove the
flag on riscv64 and loongarch64.

As we have started moving to LLVM 20, the problem must be mitigated by
stripping -fno-plt away from CFLAGS/LDFLAGS on riscv64 and loongarch64.

Link: llvm/llvm-project#124081
Reference: eweOS#3594 (comment)

Author: ziyao233

PKGBUILD

@@ -5,7 +5,7 @@
 pkgbase=pacman
 pkgname=(libalpm pacman repo-tools)
 pkgver=7.0.0
-pkgrel=8
+pkgrel=9
 arch=(x86_64 aarch64 riscv64 loongarch64)
 url=https://www.archlinux.org/pacman/
 license=(GPL)
@@ -78,11 +78,19 @@ prepare(){
 
 build()
 {
-  makepkg_cflags="-Os -pipe -fno-plt"
+  # Temporarily workaround LLVM behaviour changes on -fno-plt
+  # https://github.com/eweOS/packages/issues/3594#issuecomment-2863596036
+  case $CARCH in
+    riscv64|loongarch64)
+      export CFLAGS="${CFLAGS/-fno-plt/}"
+      export LDFLAGS="${LDFLAGS/-fno-plt/}" ;;
+  esac
+
+  makepkg_cflags="-Os -pipe"
   # TODO: riscv64
   case $CARCH in
-    x86_64) makepkg_cflags+=" -march=x86-64 -fstack-clash-protection -fcf-protection" ;;
-    aarch64) makepkg_cflags+=" -march=armv8-a" ;;
+    x86_64) makepkg_cflags+=" -fno-plt -march=x86-64 -fstack-clash-protection -fcf-protection" ;;
+    aarch64) makepkg_cflags+=" -fno-plt -march=armv8-a" ;;
     riscv64) makepkg_cflags+=" -march=rv64gc" ;;
     loongarch64) makepkg_cflags+=" -march=la464" ;;
   esac