Disallowed PATH tool "m4", but used by flex

[Michael Goffioul]

I'm experimenting with android-r-preview-2 and found a problem compiling mesa, which didn't occur with android-10. The error occurs when running flex:

23:56:24 Disallowed PATH tool "m4" used: []string{"m4", "-P"}
23:56:24 See https://android.googlesource.com/platform/build/+/master/Changes.md#PATH_Tools for more information.
[  0% 1/74788] Mesa Lex: libmesa_glsl <= external/mesa/src/compiler/glsl/glcpp/glcpp-lex.l
FAILED: out/target/product/x86/gen/STATIC_LIBRARIES/libmesa_glsl_intermediates/glsl/glcpp/glcpp-lex.c
/bin/bash -c "prebuilts/build-tools/linux-x86/bin/flex --nounistd -oout/target/product/x86/gen/STATIC_LIBRARIES/libmesa_glsl_intermediates/glsl/glcpp/glcpp-lex.c external
/mesa/src/compiler/glsl/glcpp/glcpp-lex.l"
"m4" is not allowed to be used. See https://android.googlesource.com/platform/build/+/master/Changes.md#PATH_Tools for more information.

From what I understand, flex internally calls "m4" (according to this reference: https://www.cs.virginia.edu/~cr4bd/flex-manual/M4-Dependency.html).

Any pointer in the right direction would be appreciated, thanks.

Michael.

[Dan Willemsen]

As a reminder:

This preview is not a full platform update and only for reference.

It is not expected that everything will build, as it only contains updates to some projects.

For this breakage in particular, you'll need a change like this one, which fixes up a bunch of things around how mesa was using flex/bison: https://android-review.googlesource.com/c/platform/external/mesa3d/+/1203548

- Dan

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