mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-23 07:23:34 +08:00
df4b03d859
This fixes a variety of issues related to building the documentation with CMake. In particular it cleans up the dependency management and fixes some issues where the documentation build was using generated files from the source directory.
55 lines
2.5 KiB
CMake
55 lines
2.5 KiB
CMake
# This file adds commands to manage the FISH-BUILD-VERSION-FILE (hereafter
|
|
# FBVF). This file exists in the build directory and is used to populate the
|
|
# documentation and also the version string in fish_version.o (printed with
|
|
# `echo $version` and also fish --version). The essential idea is that we are
|
|
# going to invoke git_version_gen.sh, which will update the
|
|
# FISH-BUILD-VERSION-FILE only if it needs to change; this is what makes
|
|
# incremental rebuilds fast.
|
|
#
|
|
# This code is delicate, with the chief subtlety revolving around Ninja. A
|
|
# natural and naive approach would tell the generated build system that FBVF is
|
|
# a dependency of fish_version.o, and that git_version_gen.sh updates it. Make
|
|
# will then invoke the script, check the timestamp on fish_version.o and FBVF,
|
|
# see that FBVF is earlier, and then not rebuild fish_version.o. Ninja,
|
|
# however, decides what to build up-front and will unconditionally rebuild
|
|
# fish_version.o.
|
|
#
|
|
# To avoid this with Ninja, we want to hook into its 'restat' option which we
|
|
# can do through the BYPRODUCTS feature of CMake. See
|
|
# https://cmake.org/cmake/help/latest/policy/CMP0058.html
|
|
#
|
|
# Unfortunately BYPRODUCTS behaves strangely with the Makefile generator: it
|
|
# marks FBVF as generated and then CMake itself will `touch` it on every build,
|
|
# meaning that using BYPRODUCTS will cause fish_version.o to be rebuilt
|
|
# unconditionally with the Makefile generator. Thus we want to use the
|
|
# natural-and-naive approach for Makefiles.
|
|
|
|
# **IMPORTANT** If you touch these build rules, please test both Ninja and
|
|
# Makefile generators with both a clean and dirty git tree. Verify that both
|
|
# generated build systems rebuild fish when the git tree goes from dirty to
|
|
# clean (and vice versa), and verify they do NOT rebuild it when the git tree
|
|
# stays the same (incremental builds must be fast).
|
|
|
|
# Just a handy abbreviation.
|
|
SET(FBVF FISH-BUILD-VERSION-FILE)
|
|
|
|
# TODO: find a cleaner way to do this.
|
|
IF (${CMAKE_GENERATOR} STREQUAL Ninja)
|
|
SET(FBVF-OUTPUT fish-build-version-witness.txt)
|
|
SET(CFBVF-BYPRODUCTS ${FBVF})
|
|
ELSE(${CMAKE_GENERATOR} STREQUAL Ninja)
|
|
SET(FBVF-OUTPUT ${FBVF})
|
|
SET(CFBVF-BYPRODUCTS)
|
|
ENDIF(${CMAKE_GENERATOR} STREQUAL Ninja)
|
|
|
|
# Set up the version targets
|
|
ADD_CUSTOM_TARGET(CHECK-FISH-BUILD-VERSION-FILE
|
|
COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/build_tools/git_version_gen.sh
|
|
BYPRODUCTS ${CFBVF-BYPRODUCTS})
|
|
|
|
ADD_CUSTOM_COMMAND(OUTPUT ${FBVF-OUTPUT}
|
|
DEPENDS CHECK-FISH-BUILD-VERSION-FILE)
|
|
|
|
# Abbreviation for the target.
|
|
SET(CFBVF CHECK-FISH-BUILD-VERSION-FILE)
|