Hi Guix! this patch adds a hint to guix build, when you try to build from a file and it returns #<unspecified>. The most common error is when you copy the structure from other guix modules and use `define-public` for your package. The file returns #<unspecified> and you get this message: > #<unspecified>: not something we can build. Which is not very helpful. Here is what happens with this change: > guix build: error: #<unspecified>: not something we can build > > hint: If you build from a file, make sure the last scheme expression > returns a package value. `define-public' defines a variable, but > returns #<unspecified>. To fix this, add a scheme expression at the > end of the file that consists only of the package's variable name you > defined. ex: > > (define-public my-package > (package > ...)) > > my-package If instead, you return a value that is not understood, the message is simpler (as this is not something that happens out of confusion / being new to guix or guile): > guix build: error: 1: not something we can build > > hint: If you build from a file, make sure the last scheme expression > returns a package, gexp, derivation value or a list of such values. (here the file returned "1" which we can't build :))
0001-guix-build-Add-a-hint-for-unspecified-value.patch
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