Eric did this in libvirt, and I liked it, so also in coreutils. Finally, I'm updating all other C projects I tend to do the same thing:
>From 01d92dba155d9ad87eaf0378876e0c67285c2075 Mon Sep 17 00:00:00 2001 From: Eric Blake <[email protected]> Date: Tue, 23 Oct 2012 11:06:48 +0200 Subject: [PATCH] build: default to --enable-gcc-warnings in a git tree Anyone building from cloned sources can be assumed to have a new enough environment, such that enabling gcc warnings by default will be useful. Tarballs still default to no warnings, and the default can still be overridden with --disable-gcc-warnings. * configure.ac (gl_gcc_warnings): Set default based on environment. --- configure.ac | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index d6e52c4..18ff554 100644 --- a/configure.ac +++ b/configure.ac @@ -47,7 +47,11 @@ AC_ARG_ENABLE([gcc-warnings], *) AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;; esac gl_gcc_warnings=$enableval], - [gl_gcc_warnings=no] + [if test -d "$srcdir"/.git; then + gl_gcc_warnings=yes + else + gl_gcc_warnings=no + fi] ) if test "$gl_gcc_warnings" = yes; then -- 1.8.0
