From 00d58ab266e32940a31ba35688a3d22371133629 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.

(cherry picked from commit b7bcf72990c20bf88c57d7d2b4478d8f2ad18ac3)
(cherry picked from commit 0e9d2a0fb2fad412e10a29363f92554ef7ca9583)
---
 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 68a2ec43a68..a55397e253f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -735,9 +735,6 @@ 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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