From e1091db82fccf294381943caa99b8aedac89a28e Mon Sep 17 00:00:00 2001
From: Dianne Skoll <dianne@skoll.ca>
Date: Fri, 14 Oct 2022 13:31:57 -0400
Subject: [PATCH] Don't try to use -ffat-lto-objects with clang

---
 configure    | 14 ++++++++++++--
 configure.in | 11 +++++++++--
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/configure b/configure
index eceaa348..19293229 100755
--- a/configure
+++ b/configure
@@ -3975,7 +3975,14 @@ fi
 if test "$GCC" = yes; then
 	CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
         # Check for link-time optimization support
-        for f in -flto=auto -ffat-lto-objects; do
+        f=-flto=auto
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports $f" >&5
+$as_echo_n "checking whether $CC supports $f... " >&6; }
+        if $CC -E $f /dev/null > /dev/null 2>&1 ; then
+            { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+            CFLAGS="$CFLAGS $f"
+            f=-ffat-lto-objects
             { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports $f" >&5
 $as_echo_n "checking whether $CC supports $f... " >&6; }
             if $CC -E $f /dev/null > /dev/null 2>&1 ; then
@@ -3986,7 +3993,10 @@ $as_echo "yes" >&6; }
                 { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
             fi
-        done
+        else
+            { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+        fi
 fi
 
 if test "$ac_cv_perlartifacts" = "yes" ; then
diff --git a/configure.in b/configure.in
index 8d448752..5d84edb9 100644
--- a/configure.in
+++ b/configure.in
@@ -47,7 +47,12 @@ AC_HEADER_TIME
 if test "$GCC" = yes; then
 	CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
         # Check for link-time optimization support
-        for f in -flto=auto -ffat-lto-objects; do
+        f=-flto=auto
+        AC_MSG_CHECKING([whether $CC supports $f])
+        if $CC -E $f /dev/null > /dev/null 2>&1 ; then
+            AC_MSG_RESULT([yes])
+            CFLAGS="$CFLAGS $f"
+            f=-ffat-lto-objects
             AC_MSG_CHECKING([whether $CC supports $f])
             if $CC -E $f /dev/null > /dev/null 2>&1 ; then
                 AC_MSG_RESULT([yes])
@@ -55,7 +60,9 @@ if test "$GCC" = yes; then
             else
                 AC_MSG_RESULT([no])
             fi
-        done
+        else
+            AC_MSG_RESULT([no])
+        fi
 fi
 
 if test "$ac_cv_perlartifacts" = "yes" ; then