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[Bug debug/46749] gcc.dg/debug/pr41893-1.c -gdwarf-2 testsuite failures on darwin

From: "howarth at nitro dot med.uc.edu" <gcc-bugzilla at gcc dot gnu dot org>
To: gcc-bugs at gcc dot gnu dot org
Date: Sat, 4 Dec 2010 02:11:29 +0000
Subject: [Bug debug/46749] gcc.dg/debug/pr41893-1.c -gdwarf-2 testsuite failures on darwin
Auto-submitted: auto-generated
References: <bug-46749-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46749

--- Comment #32 from Jack Howarth <howarth at nitro dot med.uc.edu> 2010-12-04 02:10:50 UTC ---
While the hack in Comment 31 produces the missing .dSYM output for -g -flto, it
also leave behind the temporary *.ltrans0.ltrans.o files in /var/tmp at the
end. A simple compile shows...


[frodo:~] howarth% ./dist/bin/gcc -flto -g -v himenoBMTxpa.c
Using built-in specs.
COLLECT_GCC=./dist/bin/gcc
COLLECT_LTO_WRAPPER=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/lto-wrapper
Target: x86_64-apple-darwin10.5.0
Configured with: ../gcc/configure --prefix=/Users/howarth/dist --with-gmp=/sw
--with-ppl=/sw --with-cloog=/sw --with-mpc=/sw --with-libiconv-prefix=/sw
--with-system-zlib --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
--enable-languages=c
Thread model: posix
gcc version 4.6.0 20101203 (experimental) (GCC) 
COLLECT_GCC_OPTIONS='-mmacosx-version-min=10.6.5' '-flto' '-g' '-v'
'-mtune=core2'
 /Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/cc1 -quiet -v
-D__DYNAMIC__ himenoBMTxpa.c -fPIC -feliminate-unused-debug-symbols -quiet
-dumpbase himenoBMTxpa.c -mmacosx-version-min=10.6.5 -mtune=core2 -auxbase
himenoBMTxpa -g -version -flto -o /var/tmp//ccAAPCUI.s
GNU C (GCC) version 4.6.0 20101203 (experimental) (x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../../x86_64-apple-darwin10.5.0/include"
#include "..." search starts here:
#include <...> search starts here:
 /Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/include
 /Users/howarth/dist/include
 /Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/include-fixed
 /usr/include
 /System/Library/Frameworks
 /Library/Frameworks
End of search list.
GNU C (GCC) version 4.6.0 20101203 (experimental) (x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 27436f303ba35e8877de0a62c5c2d06f
himenoBMTxpa.c: In function 'main':
himenoBMTxpa.c:79:5: warning: incompatible implicit declaration of built-in
function 'strcpy' [enabled by default]
himenoBMTxpa.c: In function 'set_param':
himenoBMTxpa.c:226:5: warning: incompatible implicit declaration of built-in
function 'exit' [enabled by default]
himenoBMTxpa.c: In function 'newMat':
himenoBMTxpa.c:239:5: warning: incompatible implicit declaration of built-in
function 'malloc' [enabled by default]
himenoBMTxpa.c: In function 'clearMat':
himenoBMTxpa.c:248:5: warning: incompatible implicit declaration of built-in
function 'free' [enabled by default]
COLLECT_GCC_OPTIONS='-mmacosx-version-min=10.6.5' '-flto' '-g' '-v'
'-mtune=core2'
 as -arch x86_64 -force_cpusubtype_ALL -o /var/tmp//cci8rGh2.o
/var/tmp//ccAAPCUI.s
COMPILER_PATH=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/
LIBRARY_PATH=/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../:/usr/lib/
COLLECT_GCC_OPTIONS='-mmacosx-version-min=10.6.5' '-flto' '-g' '-v'
'-mtune=core2'
 /Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/collect2 -flto
-dynamic -arch x86_64 -macosx_version_min 10.6.5 -weak_reference_mismatches
non-weak -o a.out -lcrt1.10.5.o
-L/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0
-L/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../..
/var/tmp//cci8rGh2.o -lgcc_ext.10.5 -lgcc -no_compact_unwind -lSystem
 ./dist/bin/gcc @/var/tmp//cctadu4J.args
Using built-in specs.
COLLECT_GCC=./dist/bin/gcc
COLLECT_LTO_WRAPPER=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/lto-wrapper
Target: x86_64-apple-darwin10.5.0
Configured with: ../gcc/configure --prefix=/Users/howarth/dist --with-gmp=/sw
--with-ppl=/sw --with-cloog=/sw --with-mpc=/sw --with-libiconv-prefix=/sw
--with-system-zlib --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
--enable-languages=c
Thread model: posix
gcc version 4.6.0 20101203 (experimental) (GCC) 
COLLECT_GCC_OPTIONS='-c' '-mmacosx-version-min=10.6.5' '-g' '-v' '-mtune=core2'
'-fltrans-output-list=/var/tmp//ccIno63U.ltrans.out' '-fwpa'
 /Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/lto1 -fPIC
-feliminate-unused-debug-symbols -quiet -dumpbase cci8rGh2.o
-mmacosx-version-min=10.6.5 -mtune=core2 -auxbase cci8rGh2 -g -version
-fltrans-output-list=/var/tmp//ccIno63U.ltrans.out -fwpa @/var/tmp//cc1Qg4SB
GNU GIMPLE (GCC) version 4.6.0 20101203 (experimental)
(x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU GIMPLE (GCC) version 4.6.0 20101203 (experimental)
(x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
COMPILER_PATH=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/
LIBRARY_PATH=/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../:/usr/lib/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../:/usr/lib/
COLLECT_GCC_OPTIONS='-c' '-mmacosx-version-min=10.6.5' '-g' '-v' '-mtune=core2'
'-fltrans-output-list=/var/tmp//ccIno63U.ltrans.out' '-fwpa'
 ./dist/bin/gcc @/var/tmp//ccgwI0EO.args
Using built-in specs.
COLLECT_GCC=./dist/bin/gcc
COLLECT_LTO_WRAPPER=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/lto-wrapper
Target: x86_64-apple-darwin10.5.0
Configured with: ../gcc/configure --prefix=/Users/howarth/dist --with-gmp=/sw
--with-ppl=/sw --with-cloog=/sw --with-mpc=/sw --with-libiconv-prefix=/sw
--with-system-zlib --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
--enable-languages=c
Thread model: posix
gcc version 4.6.0 20101203 (experimental) (GCC) 
COLLECT_GCC_OPTIONS='-c' '-mmacosx-version-min=10.6.5' '-g' '-v' '-mtune=core2'
'-fltrans' '-o' '/var/tmp//ccIno63U.ltrans0.ltrans.o'
 /Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/lto1 -fPIC
-feliminate-unused-debug-symbols -quiet -dumpbase ccIno63U.ltrans0.o
-mmacosx-version-min=10.6.5 -mtune=core2 -auxbase-strip
/var/tmp//ccIno63U.ltrans0.ltrans.o -g -version -fltrans @/var/tmp//ccyT9Yzo -o
/var/tmp//ccOcfTrn.s
GNU GIMPLE (GCC) version 4.6.0 20101203 (experimental)
(x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU GIMPLE (GCC) version 4.6.0 20101203 (experimental)
(x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
COLLECT_GCC_OPTIONS='-c' '-mmacosx-version-min=10.6.5' '-g' '-v' '-mtune=core2'
'-fltrans' '-o' '/var/tmp//ccIno63U.ltrans0.ltrans.o'
 as -arch x86_64 -force_cpusubtype_ALL -o /var/tmp//ccIno63U.ltrans0.ltrans.o
/var/tmp//ccOcfTrn.s
COMPILER_PATH=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/
LIBRARY_PATH=/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../:/usr/lib/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../:/usr/lib/
COLLECT_GCC_OPTIONS='-c' '-mmacosx-version-min=10.6.5' '-g' '-v' '-mtune=core2'
'-fltrans' '-o' '/var/tmp//ccIno63U.ltrans0.ltrans.o'
COLLECT_GCC_OPTIONS='-mmacosx-version-min=10.6.5' '-flto' '-g' '-v'
'-mtune=core2'
 dsymutil a.out
[frodo:~] howarth% 
[frodo:~] howarth% ./dist/bin/gcc -flto -g -v himenoBMTxpa.c
Using built-in specs.
COLLECT_GCC=./dist/bin/gcc
COLLECT_LTO_WRAPPER=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/lto-wrapper
Target: x86_64-apple-darwin10.5.0
Configured with: ../gcc/configure --prefix=/Users/howarth/dist --with-gmp=/sw
--with-ppl=/sw --with-cloog=/sw --with-mpc=/sw --with-libiconv-prefix=/sw
--with-system-zlib --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
--enable-languages=c
Thread model: posix
gcc version 4.6.0 20101203 (experimental) (GCC) 
COLLECT_GCC_OPTIONS='-mmacosx-version-min=10.6.5' '-flto' '-g' '-v'
'-mtune=core2'
 /Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/cc1 -quiet -v
-D__DYNAMIC__ himenoBMTxpa.c -fPIC -feliminate-unused-debug-symbols -quiet
-dumpbase himenoBMTxpa.c -mmacosx-version-min=10.6.5 -mtune=core2 -auxbase
himenoBMTxpa -g -version -flto -o /var/tmp//ccHiF8rF.s
GNU C (GCC) version 4.6.0 20101203 (experimental) (x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../../x86_64-apple-darwin10.5.0/include"
#include "..." search starts here:
#include <...> search starts here:
 /Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/include
 /Users/howarth/dist/include
 /Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/include-fixed
 /usr/include
 /System/Library/Frameworks
 /Library/Frameworks
End of search list.
GNU C (GCC) version 4.6.0 20101203 (experimental) (x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 27436f303ba35e8877de0a62c5c2d06f
himenoBMTxpa.c: In function 'main':
himenoBMTxpa.c:79:5: warning: incompatible implicit declaration of built-in
function 'strcpy' [enabled by default]
himenoBMTxpa.c: In function 'set_param':
himenoBMTxpa.c:226:5: warning: incompatible implicit declaration of built-in
function 'exit' [enabled by default]
himenoBMTxpa.c: In function 'newMat':
himenoBMTxpa.c:239:5: warning: incompatible implicit declaration of built-in
function 'malloc' [enabled by default]
himenoBMTxpa.c: In function 'clearMat':
himenoBMTxpa.c:248:5: warning: incompatible implicit declaration of built-in
function 'free' [enabled by default]
COLLECT_GCC_OPTIONS='-mmacosx-version-min=10.6.5' '-flto' '-g' '-v'
'-mtune=core2'
 as -arch x86_64 -force_cpusubtype_ALL -o /var/tmp//ccSn8GAt.o
/var/tmp//ccHiF8rF.s
COMPILER_PATH=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/
LIBRARY_PATH=/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../:/usr/lib/
COLLECT_GCC_OPTIONS='-mmacosx-version-min=10.6.5' '-flto' '-g' '-v'
'-mtune=core2'
 /Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/collect2 -flto
-dynamic -arch x86_64 -macosx_version_min 10.6.5 -weak_reference_mismatches
non-weak -o a.out -lcrt1.10.5.o
-L/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0
-L/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../..
/var/tmp//ccSn8GAt.o -lgcc_ext.10.5 -lgcc -no_compact_unwind -lSystem
 ./dist/bin/gcc @/var/tmp//ccpfJ4GS.args
Using built-in specs.
COLLECT_GCC=./dist/bin/gcc
COLLECT_LTO_WRAPPER=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/lto-wrapper
Target: x86_64-apple-darwin10.5.0
Configured with: ../gcc/configure --prefix=/Users/howarth/dist --with-gmp=/sw
--with-ppl=/sw --with-cloog=/sw --with-mpc=/sw --with-libiconv-prefix=/sw
--with-system-zlib --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
--enable-languages=c
Thread model: posix
gcc version 4.6.0 20101203 (experimental) (GCC) 
COLLECT_GCC_OPTIONS='-c' '-mmacosx-version-min=10.6.5' '-g' '-v' '-mtune=core2'
'-fltrans-output-list=/var/tmp//ccKpeG3H.ltrans.out' '-fwpa'
 /Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/lto1 -fPIC
-feliminate-unused-debug-symbols -quiet -dumpbase ccSn8GAt.o
-mmacosx-version-min=10.6.5 -mtune=core2 -auxbase ccSn8GAt -g -version
-fltrans-output-list=/var/tmp//ccKpeG3H.ltrans.out -fwpa @/var/tmp//ccHXxoZR
GNU GIMPLE (GCC) version 4.6.0 20101203 (experimental)
(x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU GIMPLE (GCC) version 4.6.0 20101203 (experimental)
(x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
COMPILER_PATH=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/
LIBRARY_PATH=/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../:/usr/lib/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../:/usr/lib/
COLLECT_GCC_OPTIONS='-c' '-mmacosx-version-min=10.6.5' '-g' '-v' '-mtune=core2'
'-fltrans-output-list=/var/tmp//ccKpeG3H.ltrans.out' '-fwpa'
 ./dist/bin/gcc @/var/tmp//ccL9KPbz.args
Using built-in specs.
COLLECT_GCC=./dist/bin/gcc
COLLECT_LTO_WRAPPER=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/lto-wrapper
Target: x86_64-apple-darwin10.5.0
Configured with: ../gcc/configure --prefix=/Users/howarth/dist --with-gmp=/sw
--with-ppl=/sw --with-cloog=/sw --with-mpc=/sw --with-libiconv-prefix=/sw
--with-system-zlib --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
--enable-languages=c
Thread model: posix
gcc version 4.6.0 20101203 (experimental) (GCC) 
COLLECT_GCC_OPTIONS='-c' '-mmacosx-version-min=10.6.5' '-g' '-v' '-mtune=core2'
'-fltrans' '-o' '/var/tmp//ccKpeG3H.ltrans0.ltrans.o'
 /Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/lto1 -fPIC
-feliminate-unused-debug-symbols -quiet -dumpbase ccKpeG3H.ltrans0.o
-mmacosx-version-min=10.6.5 -mtune=core2 -auxbase-strip
/var/tmp//ccKpeG3H.ltrans0.ltrans.o -g -version -fltrans @/var/tmp//ccX6FGrc -o
/var/tmp//ccnCT2j2.s
GNU GIMPLE (GCC) version 4.6.0 20101203 (experimental)
(x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU GIMPLE (GCC) version 4.6.0 20101203 (experimental)
(x86_64-apple-darwin10.5.0)
    compiled by GNU C version 4.6.0 20101203 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p3, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
COLLECT_GCC_OPTIONS='-c' '-mmacosx-version-min=10.6.5' '-g' '-v' '-mtune=core2'
'-fltrans' '-o' '/var/tmp//ccKpeG3H.ltrans0.ltrans.o'
 as -arch x86_64 -force_cpusubtype_ALL -o /var/tmp//ccKpeG3H.ltrans0.ltrans.o
/var/tmp//ccnCT2j2.s
COMPILER_PATH=/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/libexec/gcc/x86_64-apple-darwin10.5.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/
LIBRARY_PATH=/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../:/usr/lib/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/:/Users/howarth/dist/lib/gcc/x86_64-apple-darwin10.5.0/4.6.0/../../../:/usr/lib/
COLLECT_GCC_OPTIONS='-c' '-mmacosx-version-min=10.6.5' '-g' '-v' '-mtune=core2'
'-fltrans' '-o' '/var/tmp//ccKpeG3H.ltrans0.ltrans.o'
COLLECT_GCC_OPTIONS='-mmacosx-version-min=10.6.5' '-flto' '-g' '-v'
'-mtune=core2'
 dsymutil a.out

Why can't lto1 call maybe_unlink_list (lto_o_files) instead?
References:
- [Bug debug/46749] New: gcc.dg/debug/pr41893-1.c -gdwarf-2 testsuite failures on darwin
  - From: howarth at nitro dot med.uc.edu
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