diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 51 |
1 files changed, 40 insertions, 11 deletions
diff --git a/configure.ac b/configure.ac index 8fb7bd3..d1cd6a9a 100644 --- a/configure.ac +++ b/configure.ac @@ -36,17 +36,46 @@ AC_CONFIG_MACRO_DIR([m4]) AM_INIT_AUTOMAKE([foreign]) AM_SILENT_RULES([yes]) -## AM_MAINTAINER_MODE turns off "rebuild rules" that contain dependencies -## for Makefiles, configure, src/H5config.h, etc. If AM_MAINTAINER_MODE -## is *not* included here, these files will be rebuilt if out of date. -## This is a problem because if users try to build on a machine with -## the wrong versions of autoconf and automake, these files will be -## rebuilt with the wrong versions and bad things can happen. -## Also, CVS doesn't preserve dependencies between timestamps, so -## Makefiles will often think rebuilding needs to occur when it doesn't. -## Developers should './configure --enable-maintainer-mode' to turn on -## rebuild rules. -AM_MAINTAINER_MODE +## AM_MAINTAINER_MODE determines the behavior of "rebuild rules" that contain +## dependencies for Makefile.in files, configure, src/H5config.h, etc. If +## AM_MAINTAINER_MODE is enabled, these files will be rebuilt if out of date. +## When disabled, the autotools build files can get out of sync and the build +## system will not complain or try to regenerate downstream files. +## +## The AM_MAINTAINER_MODE macro also determines whether the +## --(enable|disable)-maintainer-mode configure option is available. When the +## macro is present, with or without a parameter, the option will be added +## to the generated configure script. +## +## In summary: +## +## AM_MAINTAINER_MODE([enable]) +## - Build dependencies ON by default +## - Configure option exists +## +## AM_MAINTAINER_MODE([disable]) +## - Build dependencies OFF by default +## - Configure option exists +## +## AM_MAINTAINER_MODE +## - Build dependencies OFF by default +## - Configure option exists +## +## No AM_MAINTAINER_MODE macro +## - Build dependencies ON by default +## - No configure option to control build dependencies +## +## The biggest concern for us is that version control systems like git +## usually don't preserve dependencies between timestamps, so the build +## system will often think that upstream build files like Makefile.am are +## dirty and that rebuilding needs to occur when it doesn't. This is a problem +## in release branches where we provide the autotools-generated files. Users +## who don't have autoconf, automake, etc. will then have difficulty building +## release branches checked out from git. +## +## By default, maintainer mode is enabled in development branches and disabled +## in release branches. +AM_MAINTAINER_MODE([enable]) ## ---------------------------------------------------------------------- ## Set prefix default (install directory) to a directory in the build area. |