powerpc64: powerpc64-gcc, gcc49, gcc5 bind -m32 -mcpu=powerpc a.out to /libexec/ld-elf32.so.1 instead of /libexec/ld-elf.so.1

Mark Millard markmi at dsl-only.net
Tue Dec 15 18:48:22 UTC 2015 

[This is mostly a re-titling of an earlier freebsd-pcc/freebsd-toolchain message to correctly identify the problem. I also added the freebsd-ports list and some content.]

On 2015-Dec-15, at 4:36 AM, Konstantin Belousov <kostikbel at gmail.com> wrote:

> On Mon, Dec 14, 2015 at 11:06:51PM -0800, Mark Millard wrote:
> 
> # more main.c
> int main()
> {
>   return 0;
> }
> 
> . . .
>> By contrast powerpc64-gcc binds the a.out produced to /libexec/ld-elf32.so.1 instead:
>> 
>> # ls -l `which gcc`
>> lrwxr-xr-x  1 root  wheel  48 Dec  5 05:38 /usr/bin/gcc -> /usr/local/bin/powerpc64-portbld-freebsd11.0-gcc
>> 
>> # gcc --version
>> gcc (FreeBSD Ports Collection for powerpc64) 5.2.0
>> Copyright (C) 2015 Free Software Foundation, Inc.
>> This is free software; see the source for copying conditions.  There is NO
>> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>> 
>> # gcc -m32 -mcpu=powerpc main.c
>> # file a.out
>> a.out: ELF 32-bit MSB executable, PowerPC or cisco 4500, version 1 (FreeBSD), dynamically linked, interpreter /libexec/ld-elf32.so.1, FreeBSD-style, for FreeBSD 11.0 (1100091), not stripped
> 

> This is a bug in gcc, most likely in the spec file. All FreeBSD
> ABIs use either /libexec/ld-elf.so.1 or (for older versions)
> /usr/libexec/ld-elf.so.1.

If 32 bit code on powerpc64 is supposed to use /libexec/ld-elf.so.1 just like the 64 bit code is supposed to then. . .

Looks like lang/gcc49 has the same -m32 -mcpu=powerpc ld-elf32.so.1 problem as powerpc64-gcc:

# grep ld-elf /usr/obj/portswork/usr/ports/lang/gcc49/work/gcc-4.9-20151202/gcc/config/rs6000/freebsd64.h
#define FREEBSD_DYNAMIC_LINKER32 "/libexec/ld-elf32.so.1"
#define FREEBSD_DYNAMIC_LINKER64 "/libexec/ld-elf.so.1"

# grep ld-elf /usr/obj/portswork/usr/ports/lang/gcc49/work/stage/usr/local/lib/gcc49/gcc/powerpc64-portbld-freebsd11.0/4.9.4/plugin/include/config/rs6000/freebsd64.h
#define FREEBSD_DYNAMIC_LINKER32 "/libexec/ld-elf32.so.1"
#define FREEBSD_DYNAMIC_LINKER64 "/libexec/ld-elf.so.1"

Since powerpc64-gcc is a variant build of gcc5 and also has the above sort of freebsd64.h content, lang/gcc5 likely has the problem too.

(By contrast the powerpc64 system clang (3.7) binds its -m32 -mcpu-powerpc a.out output file to /libexec/ld-elf.so.1 .)


Just for reference, my new patch-gcc-freebsd-powerpc64 variant looks like the following (tabs likely not preserved):

# svnlite diff /usr/ports/devel/powerpc64-gcc
Index: /usr/ports/devel/powerpc64-gcc/files/patch-gcc-freebsd-powerpc64
===================================================================
--- /usr/ports/devel/powerpc64-gcc/files/patch-gcc-freebsd-powerpc64	(revision 403711)
+++ /usr/ports/devel/powerpc64-gcc/files/patch-gcc-freebsd-powerpc64	(working copy)
@@ -1,5 +1,5 @@
---- gcc/config/rs6000/freebsd64.h	2015-11-28 09:06:13.019999000 -0800
-+++ gcc/config/rs6000/freebsd64.h	2015-11-28 09:16:10.459373000 -0800
+--- freebsd64.h.orig	2015-01-05 04:33:28.000000000 -0800
++++ freebsd64.h	2015-12-15 09:52:34.634200000 -0800
 @@ -65,6 +65,13 @@
  #define INVALID_64BIT "-m%s not supported in this configuration"
  #define INVALID_32BIT INVALID_64BIT
@@ -27,3 +27,21 @@
  	  if (rs6000_isa_flags & OPTION_MASK_EABI)		\
  	    {							\
  	      rs6000_isa_flags &= ~OPTION_MASK_EABI;		\
+@@ -154,7 +167,7 @@
+   { "link_os_freebsd_spec32",	LINK_OS_FREEBSD_SPEC32 },     		\
+   { "link_os_freebsd_spec64",	LINK_OS_FREEBSD_SPEC64 },
+ 
+-#define FREEBSD_DYNAMIC_LINKER32 "/libexec/ld-elf32.so.1"
++#define FREEBSD_DYNAMIC_LINKER32 "/libexec/ld-elf.so.1"
+ #define FREEBSD_DYNAMIC_LINKER64 "/libexec/ld-elf.so.1"
+ 
+ #define LINK_OS_FREEBSD_SPEC_DEF32 "\
+@@ -304,7 +317,7 @@
+ 
+ /* rs6000.h gets this wrong for FreeBSD.  We use the GCC defaults instead.  */
+ #undef WCHAR_TYPE
+-#define	WCHAR_TYPE      (TARGET_64BIT ? "int" : "long int")
++#define	WCHAR_TYPE      "int"
+ #undef  WCHAR_TYPE_SIZE
+ #define WCHAR_TYPE_SIZE 32
+ 

The same sort of changes should apply to gcc49 and gcc5.

The WCHAR_TYPE change fixes the powerpc (non-64) base type used for notations like L". . ." to match FreeBSD's powerpc/powerpc64 context. Otherwise lib32 in buildworld gets compile errors from the type mismatches --and lots of extra warnings as well.

===
Mark Millard
markmi at dsl-only.net

On 2015-Dec-15, at 4:36 AM, Konstantin Belousov <kostikbel at gmail.com> wrote:

On Mon, Dec 14, 2015 at 11:06:51PM -0800, Mark Millard wrote:
> # more main.c
> int main()
> {
>   return 0;
> }
> 
> 
> 
> # ls -l `which cc`
> -r-xr-xr-x  7 root  wheel  54137976 Dec 14 00:06 /usr/bin/cc
> 
> # cc --version
> FreeBSD clang version 3.7.0 (tags/RELEASE_370/final 246257) 20150906
> Target: powerpc64-unknown-freebsd11.0
> Thread model: posix
> 
> # cc -m32 -mcpu=powerpc main.c
> # file a.out
> a.out: ELF 32-bit MSB executable, PowerPC or cisco 4500, version 1 (FreeBSD), dynamically linked, interpreter /libexec/ld-elf.so.1, FreeBSD-style, for FreeBSD 11.0 (1100091), not stripped
> 
> 
> 
> By contrast powerpc64-gcc binds the a.out produced to /libexec/ld-elf32.so.1 instead:
> 
> # ls -l `which gcc`
> lrwxr-xr-x  1 root  wheel  48 Dec  5 05:38 /usr/bin/gcc -> /usr/local/bin/powerpc64-portbld-freebsd11.0-gcc
> 
> # gcc --version
> gcc (FreeBSD Ports Collection for powerpc64) 5.2.0
> Copyright (C) 2015 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> 
> # gcc -m32 -mcpu=powerpc main.c
> # file a.out
> a.out: ELF 32-bit MSB executable, PowerPC or cisco 4500, version 1 (FreeBSD), dynamically linked, interpreter /libexec/ld-elf32.so.1, FreeBSD-style, for FreeBSD 11.0 (1100091), not stripped
> 
This is a bug in gcc, most likely in the spec file. All FreeBSD
ABIs use either /libexec/ld-elf.so.1 or (for older versions)
/usr/libexec/ld-elf.so.1.

> 
> Context details:
> 
> # freebsd-version -ku; uname -aKU
> 11.0-CURRENT
> 11.0-CURRENT
> FreeBSD FBSDG5C0 11.0-CURRENT FreeBSD 11.0-CURRENT #1 r291891M: Wed Dec  9 09:15:33 PST 2015     root at FBSDG5C0:/usr/obj/xtoolchain/powerpc.powerpc64/usr/src/sys/GENERIC64vtsc-NODEBUG  powerpc 1100091 1100091
> 
> # pkg info powerpc64-gcc
> powerpc64-gcc-5.2.0_1
> Name           : powerpc64-gcc
> Version        : 5.2.0_1
> Installed on   : Wed Dec  9 02:18:14 2015 PST
> Origin         : devel/powerpc64-gcc
> Architecture   : freebsd:11:powerpc:64
> Prefix         : /usr/local
> Categories     : devel
> . . .
> 
> ===
> Mark Millard
> markmi at dsl-only.net
> 
> _______________________________________________
> freebsd-toolchain at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain
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