Derrick Stolee <stolee@xxxxxxxxx> writes: > You're talking about this hunk, right? > > if test -z "$GIT_TEST_CMP" > then > if test -n "$GIT_TEST_CMP_USE_COPIED_CONTEXT" > then > GIT_TEST_CMP="$DIFF -c" > else > GIT_TEST_CMP="$DIFF -u" > fi > fi > > This only switches from "diff -u" to "diff -c" if the > GIT_TEST_CMP_USE_COPIED_CONTEXT variable is set, but it is not set > by default. Thus, we are using "diff -u" by default throughout. That it can be set merely means that somebody needed to work around the lack of "-u" format in their implementation of "diff". It came to POSIX only at the Issue 7 of the standard (cf. [*1*]). Unconditional use of "diff -u" is a breaking change for them. If these people still exist, that is ;-) [Reference] *1* https://pubs.opengroup.org/onlinepubs/9699919799/utilities/diff.html The Open Group Base Specifications Issue 7, 2018 edition
