GCC, stringification, and inline GLSL?

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Can you use C++11? If so you could use raw string literals:

const GLchar* vert = R"END(
#version 120
attribute vec2 position;
void main()
{
    gl_Position = vec4( position, 0.0, 1.0 );
}
)END";

No need for escapes or explicit newlines. These strings start with an R (or r). You need a delimiter (I chose END) between the quote and the first parenthesis to escape parenthesis which you have in the code snippet.

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