linux-kernel - [tip:core/urgent] objtool: Fix 64-bit build on 32-bit host

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Message-ID: <tip-14c47b54b0d9389e3ca0718e805cdd90c5a4303a@git.kernel.org>
Date:   Wed, 6 Dec 2017 13:51:53 -0800
From:   tip-bot for Mikulas Patocka <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        tglx@...utronix.de, mpatocka@...hat.com, jpoimboe@...hat.com,
        svenjoac@....de
Subject: [tip:core/urgent] objtool: Fix 64-bit build on 32-bit host

Commit-ID:  14c47b54b0d9389e3ca0718e805cdd90c5a4303a
Gitweb:     https://git.kernel.org/tip/14c47b54b0d9389e3ca0718e805cdd90c5a4303a
Author:     Mikulas Patocka <mpatocka@...hat.com>
AuthorDate: Sat, 2 Dec 2017 16:17:44 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 6 Dec 2017 22:38:14 +0100

objtool: Fix 64-bit build on 32-bit host

The new ORC unwinder breaks the build of a 64-bit kernel on a 32-bit
host.  Building the kernel on a i386 or x32 host fails with:

  orc_dump.c: In function 'orc_dump':
  orc_dump.c:105:26: error: passing argument 2 of 'elf_getshdrnum' from incompatible pointer type [-Werror=incompatible-pointer-types]
    if (elf_getshdrnum(elf, &nr_sections)) {
                            ^
  In file included from /usr/local/include/gelf.h:32:0,
                   from elf.h:22,
                   from warn.h:26,
                   from orc_dump.c:20:
  /usr/local/include/libelf.h:304:12: note: expected 'size_t * {aka unsigned int *}' but argument is of type 'long unsigned int *'
   extern int elf_getshdrnum (Elf *__elf, size_t *__dst);
              ^~~~~~~~~~~~~~
  orc_dump.c:190:17: error: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'Elf64_Sxword {aka long long int}' [-Werror=format=]
      printf("%s+%lx:", name, rela.r_addend);
                 ~~^          ~~~~~~~~~~~~~
                 %llx

Fix the build failure.

Another problem is that if the user specifies HOSTCC or HOSTLD
variables, they are ignored in the objtool makefile.  Change the
Makefile to respect these variables.

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sven Joachim <svenjoac@....de>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: 627fce14809b ("objtool: Add ORC unwind table generation")
Link: http://lkml.kernel.org/r/19f0e64d8e07e30a7b307cd010eb780c404fe08d.1512252895.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 tools/objtool/Makefile   | 8 +++++---
 tools/objtool/orc_dump.c | 7 ++++---
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 0f94af3..ae0272f 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -7,9 +7,11 @@ ARCH := x86
 endif
 
 # always use the host compiler
-CC = gcc
-LD = ld
-AR = ar
+HOSTCC	?= gcc
+HOSTLD	?= ld
+CC	 = $(HOSTCC)
+LD	 = $(HOSTLD)
+AR	 = ar
 
 ifeq ($(srctree),)
 srctree := $(patsubst %/,%,$(dir $(CURDIR)))
diff --git a/tools/objtool/orc_dump.c b/tools/objtool/orc_dump.c
index 36c5bf6..c334382 100644
--- a/tools/objtool/orc_dump.c
+++ b/tools/objtool/orc_dump.c
@@ -76,7 +76,8 @@ int orc_dump(const char *_objname)
 	int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0;
 	struct orc_entry *orc = NULL;
 	char *name;
-	unsigned long nr_sections, orc_ip_addr = 0;
+	size_t nr_sections;
+	Elf64_Addr orc_ip_addr = 0;
 	size_t shstrtab_idx;
 	Elf *elf;
 	Elf_Scn *scn;
@@ -187,10 +188,10 @@ int orc_dump(const char *_objname)
 				return -1;
 			}
 
-			printf("%s+%lx:", name, rela.r_addend);
+			printf("%s+%llx:", name, (unsigned long long)rela.r_addend);
 
 		} else {
-			printf("%lx:", orc_ip_addr + (i * sizeof(int)) + orc_ip[i]);
+			printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i]));
 		}