merge bitcoin#25357: drop -z,noexecstack for PPC64

contrib/guix/libexec/build.sh

@@ -250,10 +250,6 @@ case "$HOST" in
     *powerpc64*) HOST_LDFLAGS="${HOST_LDFLAGS} -Wl,--no-tls-get-addr-optimize" ;;
 esac
 
-case "$HOST" in
-    powerpc64-linux-*) HOST_LDFLAGS="${HOST_LDFLAGS} -Wl,-z,noexecstack" ;;
-esac
-
 # Make $HOST-specific native binaries from depends available in $PATH
 export PATH="${BASEPREFIX}/${HOST}/native/bin:${PATH}"
 mkdir -p "$DISTSRC"

contrib/guix/manifest.scm

@@ -548,10 +548,14 @@ inspecting signatures in Mach-O binaries.")
                                            "glibc-2.27-dont-redefine-nss-database.patch"
                                            "glibc-2.27-guix-prefix.patch"))))))
 
+(define (fix-ppc64-nx-default lief)
+  (package-with-extra-patches lief
+    (search-our-patches "lief-fix-ppc64-nx-default.patch")))
+
 (define-public lief
   (package
    (name "python-lief")
-   (version "0.12.0")
+   (version "0.12.1")
    (source
     (origin
      (method git-fetch)
@@ -561,7 +565,7 @@ inspecting signatures in Mach-O binaries.")
      (file-name (git-file-name name version))
      (sha256
       (base32
-       "026jchj56q25v6gc0754dj9cj5hz5zaza8ij93y5ga94w20kzm9q"))))
+       "1xzbh3bxy4rw1yamnx68da1v5s56ay4g081cyamv67256g0qy2i1"))))
    (build-system python-build-system)
    (arguments
     `(#:phases
@@ -616,7 +620,7 @@ parse, modify and abstract ELF, PE and MachO formats.")
         ;; Git
         git
         ;; Tests
-        lief)
+        (fix-ppc64-nx-default lief))
   (let ((target (getenv "HOST")))
     (cond ((string-suffix? "-mingw32" target)
            ;; Windows

contrib/guix/patches/lief-fix-ppc64-nx-default.patch

@@ -0,0 +1,29 @@
+Correct default for Binary::has_nx on ppc64
+
+From the Linux kernel source:
+
+    * This is the default if a program doesn't have a PT_GNU_STACK
+    * program header entry. The PPC64 ELF ABI has a non executable stack
+    * stack by default, so in the absence of a PT_GNU_STACK program header
+    * we turn execute permission off.
+
+This patch can be dropped the next time we update LIEF.
+
+diff --git a/src/ELF/Binary.cpp b/src/ELF/Binary.cpp
+index a90be1ab..fd2d9764 100644
+--- a/src/ELF/Binary.cpp
++++ b/src/ELF/Binary.cpp
+@@ -1084,7 +1084,12 @@ bool Binary::has_nx() const {
+                                        return segment->type() == SEGMENT_TYPES::PT_GNU_STACK;
+                                      });
+   if (it_stack == std::end(segments_)) {
+-    return false;
++    if (header().machine_type() == ARCH::EM_PPC64) {
++      // The PPC64 ELF ABI has a non-executable stack by default.
++      return true;
++    } else {
++      return false;
++    }
+   }
+
+   return !(*it_stack)->has(ELF_SEGMENT_FLAGS::PF_X);