From b7bcf72990c20bf88c57d7d2b4478d8f2ad18ac3 Mon Sep 17 00:00:00 2001
From: Cheng Shao <terrorjack@type.dance>
Date: Tue, 21 May 2024 07:22:55 +0000
Subject: [PATCH] autoconf: remove unused context diff check

This patch removes redundant autoconf check for the context diff
program given it isn't actually been used anywhere, especially since
make removal.
---
 configure.ac               |  3 ---
 m4/fp_prog_context_diff.m4 | 23 -----------------------
 2 files changed, 26 deletions(-)
 delete mode 100644 m4/fp_prog_context_diff.m4

diff --git a/configure.ac b/configure.ac
index 5429d5c898e..cf36a2bbbaf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -709,9 +709,6 @@ AC_SUBST(TargetHasIdentDirective)
 GHC_GNU_NONEXEC_STACK
 AC_SUBST(TargetHasGnuNonexecStack)
 
-dnl ** figure out how to do context diffs
-FP_PROG_CONTEXT_DIFF
-
 dnl Let's make sure install-sh is executable here.  If we got it from
 dnl a darcs repo, it might not be (see bug #978).
 chmod +x install-sh
diff --git a/m4/fp_prog_context_diff.m4 b/m4/fp_prog_context_diff.m4
deleted file mode 100644
index 886f73ce4c0..00000000000
--- a/m4/fp_prog_context_diff.m4
+++ /dev/null
@@ -1,23 +0,0 @@
-# FP_PROG_CONTEXT_DIFF
-# --------------------
-# Figure out how to do context diffs. Sets the output variable ContextDiffCmd.
-#
-# Note: NeXTStep thinks diff'ing a file against itself is "trouble".
-AC_DEFUN([FP_PROG_CONTEXT_DIFF],
-[AC_CACHE_CHECK([for a working context diff], [fp_cv_context_diff],
-[echo foo > conftest1
-echo foo > conftest2
-fp_cv_context_diff=no
-for fp_var in '-U 1' '-u1' '-C 1' '-c1'
-do
-  if diff $fp_var conftest1 conftest2 > /dev/null 2>&1; then
-    fp_cv_context_diff="diff $fp_var"
-    break
-  fi
-done])
-if test x"$fp_cv_context_diff" = xno; then
-   AC_MSG_ERROR([cannot figure out how to do context diffs])
-fi
-AC_SUBST(ContextDiffCmd, [$fp_cv_context_diff])
-])# FP_PROG_CONTEXT_DIFF
-
-- 
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