From cc008e03d4f941a65bbbe2896242166acec09241 Mon Sep 17 00:00:00 2001
From: "Dmitry V. Levin" <ldv@altlinux.org>
Date: Thu, 6 Aug 2020 18:00:00 +0000
Subject: m4: rewrite ld -O1 check

* m4/ld-O1.m4: Rewrite using AC_LINK_IFELSE to create a more readable
autoconf macro.
---
 m4/ld-O1.m4 | 37 ++++++++++++++-----------------------
 1 file changed, 14 insertions(+), 23 deletions(-)

(limited to 'm4/ld-O1.m4')

diff --git a/m4/ld-O1.m4 b/m4/ld-O1.m4
index f67b959b..64593280 100644
--- a/m4/ld-O1.m4
+++ b/m4/ld-O1.m4
@@ -1,24 +1,15 @@
-# ld-O1.m4 serial 3
+#!/usr/bin/m4
+dnl Check whether ld supports -O1
 
-# Test if ld supports -O1
-
-AC_DEFUN([PAM_LD_O1],
-  [
-    AC_CACHE_CHECK(whether ld supports -O1,
-      pam_cv_ld_O1, [ dnl
-    cat > conftest.c <<EOF
-int main (void) { return 0; }
-EOF
-     if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-                                 -o conftest.o conftest.c
-                                 -Wl,-O1 1>&AS_MESSAGE_LOG_FD])
-  then
-    pam_cv_ld_O1=yes
-    LDFLAGS="$LDFLAGS -Wl,-O1"
-  else
-    pam_cv_ld_O1=no
-  fi
-  rm -f conftest*])
-  AC_SUBST(pam_cv_ld_O1)
-  ]
-)
+AC_DEFUN([PAM_LD_O1], [dnl
+  AC_CACHE_CHECK([whether ld supports -O1],
+                 [pam_cv_ld_O1],
+                 [saved_LDFLAGS="$LDFLAGS"
+                  LDFLAGS="$LDFLAGS -Wl,-O1"
+                  AC_LINK_IFELSE([AC_LANG_PROGRAM(,)],
+                                 [pam_cv_ld_O1=yes],
+                                 [pam_cv_ld_O1=no])
+                  LDFLAGS="$saved_LDFLAGS"])
+  AS_IF([test $pam_cv_ld_O1 = yes],
+        [LDFLAGS="$LDFLAGS -Wl,-O1"])
+])
-- 
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