Makefile.mk: address minor issues #10000
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Auto-detection used either `command -v` (for unixy shells) or `where` (for Windows ones). The former is an internal command, and it fails to run from an MSYS2 shell via a non-MSYS2 GNU Make, because make executes it as-is via `CreateProcess()`. This also results in a warning. Prepending `$(SHELL) -c` would fix it, but would also need to enclose the rest of the command line in quotes, what makes this code overly complex for little benefit. Using `which` would also solve it, but this isn't the correct way to check for tool presence and some *nix systems don't have it. Resolve this by dropping auto-detection and expect the caller to set the `NROFF` variable to `nroff`/`groff` tool, in case someone wants to rebuild the manual and such tool is available. Closes curl#10000 [ci skip]
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This silences a list of warnings when GNU Make is run with the option `--warn-undefined-variables`. Another benefit is that it is now easy to look up all user-customizable `Makefile.mk` variables by grepping for ` ?=` in the curl source tree.
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Fix
NROFFauto-detection with certain shell/make-build combinations:When a non-MSYS2 GNU Make runs inside an MSYS2 shell, Make executes
the detection command as-is via
CreateProcess(). It fails becausecommandis anshbuilt-in. Ensure to explicitly invoke the shell.Initialize user-customizable variables:
Silences a list of warnings when running GNU Make with the option
--warn-undefined-variables. Another benefit is that it's now easyto look up all user-customizable
Makefile.mkvariables by greppingfor
?=in the curl source tree.Suggested-by: Gisle Vanem
Ref: Makefile.mk: portable Makefile.m32 #9764 (comment)
Fix
MKDIRinvocation:Avoid a warning and potential issue in envs without forward-slash
support.
Closes #10000