PR28751 mbind2a / mbind2b regressions on powerpc*-linux

[Alan Modra]

Fixes failures introduced with commit 74e315dbfe52.  PowerPC64 linux
often runs with 64k page size.  Reducing the page size to 16k results
in binaries that won't run.

include/
	* bfdlink.h (struct bfd_link_info): Add commonpagesize_is_set.
ld/
	PR 28751
	* emultempl/elf.em (handle_option): Set commonpagesize_is_set.
	* ldelf.c (ldelf_after_parse): Don't error when only one of
	-z max-page-size or -z common-page-size is given, correct the
	other value to make it sane.
	* testsuite/ld-elf/elf.exp (mbind2a, mbind2b): Do not pass
	-z max-page-size.

diff --git a/include/bfdlink.h b/include/bfdlink.h
index 92e3e32360b..69fc9d33ff4 100644
--- a/include/bfdlink.h
+++ b/include/bfdlink.h
@@ -532,6 +532,9 @@ struct bfd_link_info
   /* TRUE if maxpagesize is set on command-line.  */
   unsigned int maxpagesize_is_set : 1;
 
+  /* TRUE if commonpagesize is set on command-line.  */
+  unsigned int commonpagesize_is_set : 1;
+
   /* Char that may appear as the first char of a symbol, but should be
      skipped (like symbol_leading_char) when looking up symbols in
      wrap_hash.  Used by PowerPC Linux for 'dot' symbols.  */
diff --git a/ld/emultempl/elf.em b/ld/emultempl/elf.em
index 59775260b06..7325872e1d9 100644
--- a/ld/emultempl/elf.em
+++ b/ld/emultempl/elf.em
@@ -731,6 +731,7 @@ fragment <<EOF
 	      || (link_info.commonpagesize & (link_info.commonpagesize - 1)) != 0)
 	    einfo (_("%F%P: invalid common page size \`%s'\n"),
 		   optarg + 17);
+	  link_info.commonpagesize_is_set = true;
 	}
       else if (startswith (optarg, "stack-size="))
 	{
diff --git a/ld/ldelf.c b/ld/ldelf.c
index 7a1a553cae7..799f7796017 100644
--- a/ld/ldelf.c
+++ b/ld/ldelf.c
@@ -82,8 +82,15 @@ ldelf_after_parse (void)
 
   after_parse_default ();
   if (link_info.commonpagesize > link_info.maxpagesize)
-    einfo (_("%F%P: common page size (0x%v) > maximum page size (0x%v)\n"),
-	   link_info.commonpagesize, link_info.maxpagesize);
+    {
+      if (!link_info.commonpagesize_is_set)
+	link_info.commonpagesize = link_info.maxpagesize;
+      else if (!link_info.maxpagesize_is_set)
+	link_info.maxpagesize = link_info.commonpagesize;
+      else
+	einfo (_("%F%P: common page size (0x%v) > maximum page size (0x%v)\n"),
+	       link_info.commonpagesize, link_info.maxpagesize);
+    }
 }
 
 /* Handle the generation of DT_NEEDED tags.  */
diff --git a/ld/testsuite/ld-elf/elf.exp b/ld/testsuite/ld-elf/elf.exp
index 16128c2989f..119908cda4e 100644
--- a/ld/testsuite/ld-elf/elf.exp
+++ b/ld/testsuite/ld-elf/elf.exp
@@ -365,7 +365,7 @@ if { [istarget *-*-linux*]
     run_ld_link_exec_tests [list \
 	[list \
 	    "Run mbind2a" \
-	    "$NOPIE_LDFLAGS -Wl,-z,common-page-size=0x4000,-z,max-page-size=0x4000" \
+	    "$NOPIE_LDFLAGS -Wl,-z,common-page-size=0x4000" \
 	    "" \
 	    { mbind2a.s mbind2b.c } \
 	    "mbind2a" \
@@ -374,7 +374,7 @@ if { [istarget *-*-linux*]
 	] \
 	[list \
 	    "Run mbind2b" \
-	    "-static -Wl,-z,common-page-size=0x4000,-z,max-page-size=0x4000" \
+	    "-static -Wl,-z,common-page-size=0x4000" \
 	    "" \
 	    { mbind2a.s mbind2b.c } \
 	    "mbind2b" \

-- 
Alan Modra
Australia Development Lab, IBM