[LLVMbugs] [Bug 9596] New: llvm-gcc miscompiles GMP 4.3.2/5.0.1

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9596

           Summary: llvm-gcc miscompiles GMP 4.3.2/5.0.1
           Product: new-bugs
           Version: 2.9
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: howarth at nitro.med.uc.edu
                CC: llvmbugs at cs.uiuc.edu


When the llvm-gcc compiler in llvm-gcc-4.2 2.9 is used to build GMP
4.3.2/5.0.1, the resulting builds fail the GMP make check. In the case of GMP
4.3.2 for instance, we see two failures...

/bin/sh: line 1: 22036 Segmentation fault      ${dir}$tst
FAIL: t-hamdist

/bin/sh: line 1: 22075 Segmentation fault      ${dir}$tst
FAIL: t-popcount

The first failure backtraces in gdb as...

[MacPro:tests/mpz/.libs] root# gdb ./t-hamdist
...
(gdb) r
Starting program:
/sw/src/fink.build/gmp-4.3.2-8/gmp-4.3.2/build/tests/mpz/.libs/t-hamdist 
Reading symbols for shared libraries ++. done

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: 13 at address: 0x0000000000000000
0x0000000100037ab0 in __gmpn_popcount ()
(gdb) bt
#0  0x0000000100037ab0 in __gmpn_popcount ()
#1  0x0000000100020a5b in __gmpz_hamdist ()
#2  0x0000000100001436 in check_twobits () at t-hamdist.c:45
#3  0x000000010000165b in main () at t-hamdist.c:119
(gdb) 

In the second case, the failure backtraces as...

MacPro:tests/mpz/.libs] root# gdb ./t-popcount
...

(gdb) r
Starting program:
/sw/src/fink.build/gmp-4.3.2-8/gmp-4.3.2/build/tests/mpz/.libs/t-popcount 
Reading symbols for shared libraries ++. done

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: 13 at address: 0x0000000000000000
0x000000010002bab0 in __gmpn_popcount ()
(gdb) bt
#0  0x000000010002bab0 in __gmpn_popcount ()
#1  0x00000001000008a9 in __gmpz_popcount [inlined] () at :38
#2  0x00000001000008a9 in check_onebit () at t-popcount.c:38
#3  0x0000000100000cae in main () at t-popcount.c:163
(gdb) 

The test cases were compiled as...

llvm-gcc-4 -std=gnu99 -DHAVE_CONFIG_H -I. -I../../../tests/mpz -I../..
-I../../.. -I../../../tests -fexceptions -I/sw/include -O2 -pedantic -m64 -g
-mtune=core2 -c ../../../tests/mpz/t-hamdist.c

and

llvm-gcc-4 -std=gnu99 -DHAVE_CONFIG_H -I. -I../../../tests/mpz -I../..
-I../../.. -I../../../tests -fexceptions -I/sw/include -O2 -pedantic -m64
-mtune=core2 -g -c ../../../tests/mpz/t-popcount.c

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