[Bug 93989] build: flex-2.5.39 seems to be failing for glsl_lexer.ll

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93989

            Bug ID: 93989
           Summary: build: flex-2.5.39 seems to be failing for
                    glsl_lexer.ll
           Product: Mesa
           Version: git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: glsl-compiler
          Assignee: idr at freedesktop.org
          Reporter: 0xe2.0x9a.0x9b at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Build system: gentoo
Failing flex version: 2.5.39
Good flex version: 2.6.0

Possible explanation 1: The configuration script should be checking for version
>= 2.6.0
Possible explanation 2: Invalid directory

Log:

make[2]: Entering directory
'/var/tmp/portage/media-libs/mesa-9999/work/mesa-9999-abi_x86_64.amd64/src/compiler'
bison  -o glsl/glsl_parser.cpp -p "_mesa_glsl_" --defines=./glsl/glsl_parser.h
/var/tmp/portage/media-libs/mesa-9999/work/mesa-9999/src/compiler/glsl/glsl_parser.yy
flex  -o glsl/glsl_lexer.cpp
/var/tmp/portage/media-libs/mesa-9999/work/mesa-9999/src/compiler/glsl/glsl_lexer.ll
/bin/mkdir -p glsl/glcpp
/bin/mkdir -p glsl/glcpp
flex: could not create glsl/glsl_lexer.cpp
Makefile:2903: recipe for target 'glsl/glsl_lexer.cpp' failed

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