[LLVMbugs] [Bug 10160] New: Problem with autoconf's mmap check

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10160

           Summary: Problem with autoconf's mmap check
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: ismail at namtrac.org
                CC: llvmbugs at cs.uiuc.edu


mmap.c contains the default MMAP check from autoconf

[/kutu/stuff]> clang -O1 -D_FORTIFY_SOURCE=2 mmap.c    
[/kutu/stuff]> ./a.out 
[... hangs ... ]

[/kutu/stuff]> gcc -O1 -D_FORTIFY_SOURCE=2 mmap.c 
[/kutu/stuff]> ./a.out 
[/kutu/stuff]> 

This only happens when -D_FORTIFY_SOURCE=2 is specified, according to gdb
program hangs in line 223:

    if (read (fd, data3, pagesize) != pagesize)

Due to this problem lots of configure scripts just hang when compiling programs
with clang.

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