[LLVMbugs] [Bug 8786] New: Checking whether libc provides ssp during configure doesn't work well for linux

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8786

           Summary: Checking whether libc provides ssp during configure
                    doesn't work well for linux
           Product: tools
           Version: 2.8
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llvm-gcc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: woongsik76.choi at gmail.com
                CC: llvmbugs at cs.uiuc.edu


llvm-gcc/gcc/configure script checks glibc version to decide whether glibc
provides ssp routines. The check is performed with egrep as follows:

      # glibc 2.4 and later provides __stack_chk_fail and
      # either __stack_chk_guard, or TLS access to stack guard canary.
      if test -f $glibc_header_dir/features.h \
         && $EGREP '^[       ]*#[         ]*define[       ]+__GNU_LIBRARY__ ... 
      ...

In the above code, "[       ]" pattern consists of bunch of spaces.
However, it should be a tab and a space to correctly match both tabs and spaces
in features.h.

I have attached a patch for llvm-gcc/gcc/configure and
llvm-gcc/gcc/configure.ac to solve this small problem.

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