[Bug ada/52362] gnat.dg/lto8.adb FAILs with gas/gld

["ebotcazou at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52362

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-05-14 11:14:28 UTC ---
When there are many files to link, gnatlink passes a file containing the file
names, instead of the file names directly, on the GCC link line.  There is a
bad interaction with LTO:

eric@atlantis:~/build/gcc-4_7-branch/native32> cat t.c
int main (void) { return 0; }
eric@atlantis:~/build/gcc-4_7-branch/native32> gcc/xgcc -Bgcc -c t.c -flto
eric@atlantis:~/build/gcc-4_7-branch/native32> cat FILE
INPUT (./t.o)
eric@atlantis:~/build/gcc-4_7-branch/native32> gcc/xgcc -Bgcc -o t FILE
eric@atlantis:~/build/gcc-4_7-branch/native32> ./t
eric@atlantis:~/build/gcc-4_7-branch/native32> gcc/xgcc -Bgcc -o t FILE -flto
/tmp/ccTBohVP.ltrans0.ltrans.o: In function `main':
ccTBohVP.ltrans0.o:(.text+0x0): multiple definition of `main'
./t.o:t.c:(.text+0x0): first defined here
./t.o: In function `main':
t.c:(.text+0x0): multiple definition of `main'
./t.o:t.c:(.text+0x0): first defined here
collect2: error: ld returned 1 exit status

We should probably use a regular response file instead:
eric@atlantis:~/build/gcc-4_7-branch/native32> cat FILE2
./t.o
eric@atlantis:~/build/gcc-4_7-branch/native32> gcc/xgcc -Bgcc -o t -Wl,@FILE2
-flto
eric@atlantis:~/build/gcc-4_7-branch/native32> ./t