Date: Sun, 29 Apr 2007 07:35:40 +1000 (EST) From: Peter Jeremy <peterjeremy@optushome.com.au> To: FreeBSD-gnats-submit@FreeBSD.org Subject: amd64/112215: [patch] "gcc -m32" attempts to link against 64-bit libs Message-ID: <200704282135.l3SLZesi001722@turion.vk2pj.dyndns.org> Resent-Message-ID: <200704282140.l3SLe5e9060858@freefall.freebsd.org>
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>Number: 112215
>Category: amd64
>Synopsis: [patch] "gcc -m32" attempts to link against 64-bit libs
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-amd64
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Apr 28 21:40:05 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator: Peter Jeremy
>Release: FreeBSD 6.2-STABLE amd64
>Organization:
n/a
>Environment:
System: FreeBSD turion.vk2pj.dyndns.org 6.2-STABLE FreeBSD 6.2-STABLE #25: Tue Jan 30 05:01:57 EST 2007 root@turion.vk2pj.dyndns.org:/usr/obj/usr/src/sys/turion amd64
>Description:
"gcc -m32" correctly builds 32-bit objects but attempts to use
64-bit libraries and the 64-bit dynamic loader when linking.
>How-To-Repeat:
echo 'main(){printf("Hello world\\n");}' > x.c
gcc -v -m32 x.c
Note that whilst it correctly passes "-m elf_i386_fbsd" to ld,
it specifies /libexec/ld-elf.so.1 instead of /libexec/ld-elf32.so.1
and /usr/lib/... instead of /usr/lib32/...
>Fix:
A work-around is to install /usr/libdata/gcc/specs which is
"gcc -dumpspecs" with the following patch:
--- - Sun Apr 29 07:17:26 2007
+++ specs Sat Apr 28 22:25:15 2007
@@ -99,7 +99,7 @@
*startfile_prefix_spec:
-/usr/lib/
+%{m32:/usr/lib32/; :/usr/lib/}
*sysroot_suffix_spec:
@@ -120,7 +120,7 @@
}
*fbsd_dynamic_linker:
-/libexec/ld-elf.so.1
+%{m32:/libexec/ld-elf32.so.1; :/libexec/ld-elf.so.1}
*link_command:
%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S: %(linker) %l %{pie:} %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} %{r} %{s} %{t} %{u*} %{x} %{z} %{Z} %{!A:%{!nostdlib:%{!nostartfiles:%S}}} %{static:} %{L*} %(link_libgcc) %o %{fprofile-arcs|fprofile-generate:-lgcov} %{!nostdlib:%{!nodefaultlibs:%(link_gcc_c_sequence)}} %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} }}}}}}
A complete fix is less clear. *fbsd_dynamic_linker is derived from
FBSD_DYNAMIC_LINKER - which is currently common across all FreeBSD
platforms. (Note that the code for FBSD_MAJOR<5 is obsolete now).
Likewise *startfile_prefix_spec is common. The following (untested)
patch should work:
Index: /usr/src/contrib/gcc/config/freebsd-spec.h
===================================================================
RCS file: /usr/ncvs/src/contrib/gcc/config/freebsd-spec.h,v
retrieving revision 1.19.2.1
diff -u -r1.19.2.1 freebsd-spec.h
--- /usr/src/contrib/gcc/config/freebsd-spec.h 11 Jul 2006 19:13:04 -0000 1.19.2.1
+++ /usr/src/contrib/gcc/config/freebsd-spec.h 28 Apr 2007 21:25:27 -0000
@@ -166,6 +166,9 @@
#if FBSD_MAJOR < 5
#define FBSD_DYNAMIC_LINKER "/usr/libexec/ld-elf.so.1"
+#elif defined(__amd64)
+#define FBSD_DYNAMIC_LINKER \
+ "%{m32:/libexec/ld-elf32.so.1; :/libexec/ld-elf.so.1}"
#else
#define FBSD_DYNAMIC_LINKER "/libexec/ld-elf.so.1"
#endif
Index: /usr/src/gnu/usr.bin/cc/cc_tools/freebsd-native.h
===================================================================
RCS file: /usr/ncvs/src/gnu/usr.bin/cc/cc_tools/freebsd-native.h,v
retrieving revision 1.24.8.2
diff -u -r1.24.8.2 freebsd-native.h
--- /usr/src/gnu/usr.bin/cc/cc_tools/freebsd-native.h 11 Jul 2006 20:02:39 -0000 1.24.8.2
+++ /usr/src/gnu/usr.bin/cc/cc_tools/freebsd-native.h 28 Apr 2007 21:33:24 -0000
@@ -44,7 +44,11 @@
#undef MD_STARTFILE_PREFIX /* We don't need one for now. */
#define STANDARD_STARTFILE_PREFIX PREFIX"/lib/"
+#if defined(__amd64)
+#define STARTFILE_PREFIX_SPEC "%{m32:"PREFIX"/lib32/; :"PREFIX"/lib/}"
+#else
#define STARTFILE_PREFIX_SPEC PREFIX"/lib/"
+#endif
/* For the native system compiler, we actually build libgcc in a profiled
version. So we should use it with -pg. */
>Release-Note:
>Audit-Trail:
>Unformatted:
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