From 09a845c1aa7e8be4944628d533de65b883088bf6 Mon Sep 17 00:00:00 2001 From: Matan Nassau Date: Mon, 1 Aug 2016 12:25:34 -0400 Subject: [PATCH] make: fix dirty check, support concurrent build if we hardwire the build script in the target commands, then what we want to do remains opaque to make. it is better to speak make's language, so it understands us, so we can rip the benefits from that. really, we don't have 1 test target, but we have 3 targets: the 3 pdf examples. when we extract 3 rules from the 1 we have right now, make gets to understand what we actually want to do: * understand there are 3 steps to the build, not 1 * understand what are the products that will yield (pdfs) * understand products' dependencies (texs) * understand the products are independent of each other when make knows what the products are and their dependencies are, it can tell when there is no work to do. for example, if the pdf is already there and its tex dependency hasn't changed, there is no need to re-compile the pdf. when make knows the products are independent of each other, and we compile with make -j, then it can do a faster build by compiling the pdfs concurrently, rather than serially one after the other. there is an additional benefit here: we can compile a particular pdf, and not the others: make examples/cv.pdf. finally, note that because now make can tell when there's nothing to do, you might be surprised if, for example, on a pristine checkout of the repository, you run make, and make responds make: Nothing to be done for `examples'. this is because the pdfs are checked in, and make sees the texs haven't changed since they were last compiled. to force a build as was the case before, run make -B. alternatively, you can touch any of the tex files, and make will recompile the touched texs. --- Makefile | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/Makefile b/Makefile index 893b3d2..db00a3f 100644 --- a/Makefile +++ b/Makefile @@ -1,3 +1,6 @@ +.PHONY: examples -test: - cd examples/ ; for f in *.tex; do xelatex $$f; done +examples: $(foreach x,coverletter cv resume,examples/$x.pdf) + +%.pdf: %.tex + xelatex -output-directory=$(dir $<) $<