System Environment:
--------------------------
Platform: Ironlake
Libdrm:		(master)libdrm-2.4.52-4-gc5de5abbd90333fe1359283fb3a5e457b0f389f3
Mesa:		(master)57405605a8c320f9d6ea389afd43ce6f013330a5
Xserver:	(master)xorg-server-1.15.0-627-gf34dc7fa96457ea6a0703493d74e63cca357712e
Xf86_video_intel:(master)2.99.910-47-gc91af569ee90a832899c9038badd84921e9a87fc
Cairo:		(master)4144307dbfbe7b297135d9ea4b080cae7e06b997
Libva:		(staging)fae9c44816a4c3cfc480d2879d1b4a0c1c3a1527
Libva_intel_driver:(staging)bd630edd844b88ea543a027654db296ff7da16cd
Kernel:	(drm-intel-nightly) 164a4cb4c1431a0689f85507868356fae24da638

Bug detailed description:
-------------------------
It fails on all platforms  with mesa master branch, works well on 10.1 branch.
Following piglit cases also fail with same bisect commit:
spec_glsl-1.10_compiler_reserved_double-underscore-02.frag	
spec_glsl-1.10_compiler_reserved_double-underscore-03.frag	

Bisect shows: 2c85fd5a964a78c9f7a93994fb79f1723c6f45b5 is the first bad commit
commit 2c85fd5a964a78c9f7a93994fb79f1723c6f45b5
Author:     Ian Romanick <ian.d.romanick@intel.com>
AuthorDate: Tue Feb 18 09:36:08 2014 -0800
Commit:     Ian Romanick <ian.d.romanick@intel.com>
CommitDate: Wed Feb 19 15:08:50 2014 -0800

    glsl: Only warn for macro names containing __

    From page 14 (page 20 of the PDF) of the GLSL 1.10 spec:

        "In addition, all identifiers containing two consecutive underscores
         (__) are reserved as possible future keywords."

    The intention is that names containing __ are reserved for internal use
    by the implementation, and names prefixed with GL_ are reserved for use
    by Khronos.  Names simply containing __ are dangerous to use, but should
    be allowed.

    Per the Khronos bug mentioned below, a future version of the GLSL
    specification will clarify this.

    Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
    Cc: "9.2 10.0 10.1" <mesa-stable@lists.freedesktop.org>
    Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
    Tested-by: Kenneth Graunke <kenneth@whitecape.org>
    Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
    Tested-by: Darius Spitznagel <d.spitznagel@goodbytez.de>
    Cc: Tapani Pälli <lemody@gmail.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71870
    Bugzilla: Khronos #11702

output:
Successfully compiled fragment shader /GFX/Test/Piglit/piglit/tests/spec/glsl-1.10/compiler/reserved/double-underscore-01.frag: 0:15(21): warning: identifier `__i_am_reserved' uses reserved `__' string

Shader source:
// [config]
// expect_result: fail
// glsl_version: 1.10
// [end config]
//
// Check that variable names that contain a double underscore, and the double
// underscore is located in the middle of the variable name, are reserved,
//
// From page 14 (20 of pdf) of the GLSL 1.10 spec:
//     "In addition, all identifiers containing two consecutive underscores
//     (__) are reserved as possible future keywords."

int f()
{
        int __i_am_reserved;
        return 0;
}

PIGLIT: {'result': 'fail' }

Reproduce steps:
-------------------------
1. xinit
2. ./bin/glslparsertest /GFX/Test/Piglit/piglit/tests/spec/glsl-1.10/compiler/reserved/double-underscore-01.frag fail 1.10