[Bug 72686] New: GLSL preprocessor does not eat comments correctly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72686

          Priority: medium
            Bug ID: 72686
                CC: idr at freedesktop.org
          Assignee: cworth at cworth.org
           Summary: GLSL preprocessor does not eat comments correctly
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: idr at freedesktop.org
          Hardware: Other
            Status: NEW
           Version: git
         Component: glsl-compiler
           Product: Mesa

The GLSL spec says "Comments are each replaced by one space character," as do
the C and C++ specifications.  This means that C code such as

#define X a/*
*/b

X

will produce

# 1 "/tmp/foo.c"
# 1 "<command-line>"
# 1 "/tmp/foo.c"



a b

It also means that GLSL code such as

#version 120
#define X gl_Position/*
*/ =

void main()
{
   X vec4(0.);
}

should compile as if it were

#version 120
void main()
{
   gl_Position = vec4(0.);
}

On Mesa, this generates an error:

0:3(3): error: syntax error, unexpected '='

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