[Bug 3526] New: [IcedTea8] configure fails to parse GCC version

[bugzilla-daemon at icedtea.classpath.org]

https://icedtea.classpath.org/bugzilla/show_bug.cgi?id=3526

            Bug ID: 3526
           Summary: [IcedTea8] configure fails to parse GCC version
           Product: IcedTea
           Version: 8-hg
          Hardware: all
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: IcedTea
          Assignee: gnu.andrew at redhat.com
          Reporter: gnu.andrew at redhat.com
                CC: unassigned at icedtea.classpath.org

The version test in common/autoconf/toolchain.m4 attempts to parse the verbose
version output of GCC:

$ gcc --version
gcc (Gentoo 6.3.0 p1.0) 6.3.0
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

It would be simpler and more reliable to use -dumpversion.

$ gcc -dumpversion
6.3.0

as the HotSpot build does:

  # -dumpversion in gcc-2.91 shows "egcs-2.91.66". In later version, it only    
  # prints the numbers (e.g. "2.95", "3.2.1")                                   
  CC_VER_MAJOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f1)
  CC_VER_MINOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2)

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