http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52795
Bug #: 52795
Summary: FAIL: gcc.dg/tree-prof/pr34999.c compilation,
-fprofile-use -D_PROFILE_USE on
{x86_64,i386}-apple-darwin{10,11} at -m64
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: howa...@nitro.med.uc.edu
The failure...
FAIL: gcc.dg/tree-prof/pr34999.c compilation, -fprofile-use -D_PROFILE_USE
UNRESOLVED: gcc.dg/tree-prof/pr34999.c execution, -fprofile-use
-D_PROFILE_USE
occurs at -m64 on {x86_64,i386}-apple-darwin{10,11}. This occurs as a linker
failure of the form...
Assertion failed: (cfiStartsArray[i] != cfiStartsArray[i-1]), function parse,
file /SourceCache/ld64/ld64-128.2/src/ld/parsers/macho_relocatable_file.cpp,
line 1519.
0 0x10c62d1df __assert_rtn + 79
1 0x10c648ae5
mach_o::relocatable::Parser<x86_64>::parse(mach_o::relocatable::ParserOptions
const&) + 917
2 0x10c63632e mach_o::relocatable::Parser<x86_64>::parse(unsigned char
const*, unsigned long long, char const*, long, unsigned int,
mach_o::relocatable::ParserOptions const&) + 286
3 0x10c632b2b mach_o::relocatable::parse(unsigned char const*, unsigned long
long, char const*, long, unsigned int, mach_o::relocatable::ParserOptions
const&) + 91
4 0x10c66b6fd ld::tool::InputFiles::makeFile(Options::FileInfo const&, bool)
+ 653
5 0x10c66ccfb ld::tool::InputFiles::InputFiles(Options&, char const**) + 651
6 0x10c62d426 main + 358
This was filed as radr://10960042 and Apple's analysis was...
pr34999 is failing because the third FDE points to (LCOLDB2) which has no
non-local label preceding it, so the assembler creates a local relocation. But
that loses information, and the linker cannot recover what the FDE is supposed
to point to. A simple fix in the compiler is to not use relocations in the
__eh_frame section:
--- /tmp/pr34999.org/pr34999.s 2012-02-29 18:59:32.000000000 -0800
+++ /tmp/pr34999.fix/pr34999.s 2012-03-14 17:37:56.000000000 -0700
@@ -210,7 +210,8 @@
.long L$set$9
LASFDE5:
.long LASFDE5-EH_frame1
- .quad LCOLDB2-.
+ .set L$set$temp,LCOLDB2-.
+ .quad L$set$temp
.set L$set$10,LCOLDE2-LCOLDB2
.quad L$set$10
.byte 0
The darwin linker knows how to parse __eh_frame. It does not need relocations.
