[LLVMbugs] [Bug 4277] New: llvm-gcc builds libstdc++ with symbols from libm

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4277

           Summary: llvm-gcc builds libstdc++ with symbols from libm
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nlewycky at google.com
                CC: rafael.espindola at gmail.com, llvmbugs at cs.uiuc.edu


On x86-64 linux, the built libstdc++ defines logf and does so badly:

~/llvm-gcc/install/lib64$ objdump -dr libstdc++.so
[...]
00000000000541e0 <logf at plt>:
   541e0:       ff 25 f2 f4 27 00       jmpq   *0x27f4f2(%rip)        # 2d36d8
<_GLOBAL_OFFSET_TABLE_+0x16f0>
   541e6:       68 db 02 00 00          pushq  $0x2db
   541eb:       e9 30 d2 ff ff          jmpq   51420 <_init+0x18>
[...]
000000000009bb40 <logf>:
   9bb40:       48 83 ec 08             sub    $0x8,%rsp
   9bb44:       e8 97 86 fb ff          callq  541e0 <logf at plt>
   9bb49:       48 83 c4 08             add    $0x8,%rsp
   9bb4d:       c3                      retq   
   9bb4e:       66 90                   xchg   %ax,%ax

This causes any program that calls logf() and linked against the libstdc++
built by llvm-gcc to enter an infinite loop of calling itself.

All the other math symbols are there too (hypot, sinf, powl etc), which aren't
in my system libstdc++, and they also seem to have recursive definitions.

Here's the configure flags I passed to llvm-gcc configure to cause this:
--enable-checking --enable-llvm=/home/nlewycky/llvm --program-prefix=llvm-
--prefix=/home/nlewycky/llvm-gcc/install --target=x86_64-unknown-linux-gnu
--disable-nls --enable-threads=posix --enable-symvers=gnu --enable-__cxa_atexit
--enable-c99 --enable-long-long --with-gnu-as --with-gnu-ld --disable-multilib
--enable-shared=libgcc,libmudflap,libssp,libstdc++ --enable-languages=c,c++
--with-native-system-header-dir=/include --with-local-prefix=/
--enable-clocale=gnu


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