[Octave-bug-tracker] [bug #60413] build: sed expression problems when prefix is empty or slash

[Mike Miller]

Follow-up Comment #1, bug #60413 (project octave):

As another odd example showing how these substitutions can go very wrong,
build with './configure --prefix=/u', yes a new top-level directory named
"/u". And let's add CPPFLAGS=-I/usr/local/include and LDFLAGS=-L/usr/local/lib
into the mix.

The resulting libinterp/build-env.cc has:


    const char *CPPFLAGS = "-I${prefix}sr/local/include";
    const char *FLIBS = " -L${prefix}sr/local/lib
-L${prefix}sr/lib/gcc/x86_64-linux-gnu/10
-L${prefix}sr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu
-L${prefix}sr/lib/gcc/x86_64-linux-gnu/10/../../../../lib
-L/lib/x86_64-linux-gnu -L/lib/../lib -L${prefix}sr/lib/x86_64-linux-gnu
-L${prefix}sr/lib/../lib -L${prefix}sr/lib/gcc/x86_64-linux-gnu/10/../../..
-lgfortran -lm -lquadmath";
    const char *LDFLAGS = "-L${prefix}sr/local/lib";


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