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Description: Fix compiling with gcc-15
Author: Bernd Paysan <bernd@net2o.de>
Last-Update: 2026-03-13
diff --git a/configure.in b/configure.in
index 475a68f..6f957c8 100644
--- a/configure.in
+++ b/configure.in
@@ -39,6 +39,20 @@ AC_SUBST(LTDLINCL)
AC_SUBST(LIBLTDL)
AC_SUBST(LTDL_LDLIBS)
+#suppress "-flto=auto"
+case "$CFLAGS" in
+ *-flto=auto*)
+ CFLAGS=`echo $CFLAGS | sed -e 's/-flto=auto//g' -e 's/-ffat-lto-objects//g' -e 's/ / /g' -e 's/ / /g'`
+ ;;
+esac
+
+#suppress "-flto=auto"
+case "$LDFLAGS" in
+ *-flto=auto*)
+ LDFLAGS=`echo $LDFLAGS | sed -e 's/-flto=auto//g' -e 's/-ffat-lto-objects//g' -e 's/ / /g' -e 's/ / /g'`
+ ;;
+esac
+
#suppress the "-g -O2" default
test "$CFLAGS" || CFLAGS=-O2
@@ -131,7 +148,7 @@ AC_ARG_VAR(ac_cv_sizeof_uint128_t, [sizeof(uint128_t)])
AC_ARG_VAR(ac_cv_c_bigendian, [Is the target big-endian ("yes" or "no")?])
AC_ARG_VAR(no_dynamic_default, [run gforth with --dynamic (0) or --no-dynamic (1) by default])
AC_ARG_VAR(condbranch_opt, [enable (1) or disable (0) using two dispatches for conditional branches])
-AC_ARG_VAR(skipcode, [assembly code for skipping 16 bytes of code])
+AC_ARG_VAR(skipcode, [assembly code for skipping 4 bytes of code])
AC_ARG_VAR(asmcomment, [assembler comment start string])
AC_ARG_VAR(arm_cacheflush, [file containing ARM cacheflush function (without .c)])
AC_ARG_VAR(LTDL_LIBRARY_PATH, [additional directories for libltdl (for some 64-bit platforms)])
@@ -242,6 +259,7 @@ case "$host_cpu" in
;;
i*86)
machine=386
+ test "$skipcode_arch" || skipcode_arch="nopl (%eax,%eax,1)"
CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr"
;;
x86_64)
@@ -249,12 +267,15 @@ case "$host_cpu" in
in
*-m32*)
machine=386
+ test "$skipcode_arch" || skipcode_arch="nopl (%eax,%eax,1)"
CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr"
CFLAGS_1="$CFLAGS"
CFLAGS="$CFLAGS -march=athlon64"
;;
*)
machine=amd64
+ test "$skipcode_arch" || skipcode_arch="nopl (%rax,%rax,1)"
+ CFLAGS="$CFLAGS -fomit-frame-pointer"
;;
esac
;;
@@ -550,62 +571,51 @@ AC_DEFINE_UNQUOTED(SMALL_OFF_T,$ac_small_off_t,[1 if off_t fits in a Cell])
ENGINE_FLAGS=
AC_SUBST(ENGINE_FLAGS)
-# Check whether GCC understands -fno-gcse
-
-AC_MSG_CHECKING([if $CC understands -fno-gcse])
-CFLAGS_1="$CFLAGS"
-CFLAGS="$CFLAGS -fno-gcse"
-AC_TRY_COMPILE(,,ac_nogcse=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-gcse",ac_nogcse=no)
-CFLAGS="$CFLAGS_1"
-AC_MSG_RESULT($ac_nogcse)
-
-# Check whether GCC understands -fno-strict-aliasing
-AC_MSG_CHECKING([if $CC understands -fno-strict-aliasing])
-CFLAGS_1="$CFLAGS"
-CFLAGS="$CFLAGS -fno-strict-aliasing"
-AC_TRY_COMPILE(,,ac_nostrictaliasing=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-strict-aliasing",ac_nostrictaliasing=no)
-CFLAGS="$CFLAGS_1"
-AC_MSG_RESULT($ac_nostrictaliasing)
-
-# Check whether GCC understands -fno-crossjumping
-AC_MSG_CHECKING([if $CC understands -fno-crossjumping])
-CFLAGS_1="$CFLAGS"
-CFLAGS="$CFLAGS -fno-crossjumping"
-AC_TRY_COMPILE(,,ac_nocrossjumping=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-crossjumping",ac_nocrossjumping=no)
-CFLAGS="$CFLAGS_1"
-AC_MSG_RESULT($ac_nocrossjumping)
-
-# Check whether GCC understands -fno-reorder-blocks
-AC_MSG_CHECKING([if $CC understands -fno-reorder-blocks])
-CFLAGS_1="$CFLAGS"
-CFLAGS="$CFLAGS -fno-reorder-blocks"
-AC_TRY_COMPILE(,,ac_noreorder_blocks=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-reorder-blocks",ac_noreorder_blocks=no)
-CFLAGS="$CFLAGS_1"
-AC_MSG_RESULT($ac_noreorder_blocks)
-
-# Check whether GCC understands -falign-labels=1
-AC_MSG_CHECKING([if $CC understands -falign-labels=1])
-CFLAGS_1="$CFLAGS"
-CFLAGS="$CFLAGS -falign-labels=1"
-AC_TRY_COMPILE(,,ac_align_labels=yes;ENGINE_FLAGS="$ENGINE_FLAGS -falign-labels=1",ac_align_labels=no)
-CFLAGS="$CFLAGS_1"
-AC_MSG_RESULT($ac_align_labels)
-
-# Check whether GCC understands -falign-loops=1
-AC_MSG_CHECKING([if $CC understands -falign-loops=1])
-CFLAGS_1="$CFLAGS"
-CFLAGS="$CFLAGS -falign-loops=1"
-AC_TRY_COMPILE(,,ac_align_loops=yes;ENGINE_FLAGS="$ENGINE_FLAGS -falign-loops=1",ac_align_loops=no)
-CFLAGS="$CFLAGS_1"
-AC_MSG_RESULT($ac_align_loops)
-
-# Check whether GCC understands -falign-jumps=1
-AC_MSG_CHECKING([if $CC understands -falign-jumps=1])
-CFLAGS_1="$CFLAGS"
-CFLAGS="$CFLAGS -falign-jumps=1"
-AC_TRY_COMPILE(,,ac_align_jumps=yes;ENGINE_FLAGS="$ENGINE_FLAGS -falign-jumps=1",ac_align_jumps=no)
-CFLAGS="$CFLAGS_1"
-AC_MSG_RESULT($ac_align_jumps)
+# Try a number of flags as workarounds
+
+CHECKFLAGS="$CHECKFLAGS no-gcse caller-saves no-defer-pop no-inline wrapv char-unsigned no-strict-aliasing no-cse-follow-jumps no-reorder-blocks no-reorder-blocks-and-partition no-toplevel-reorder no-trigraphs align-labels=1 align-loops=1 align-jumps=1 no-delete-null-pointer-checks cf-protection=none llvm=--tail-dup-indirect-size=0"
+
+case "$host_os" in
+ *netbsd*)
+ ;;
+ *)
+ CHECKFLAGS="$CHECKFLAGS no-lto"
+ ;;
+esac
+
+if test `$CC -dumpversion | cut -f1 -d.` -lt 14
+then
+ CHECKFLAGS="$CHECKFLAGS no-tree-vectorize"
+fi
+
+for i in $CHECKFLAGS
+do
+ ac_i=$(echo ac_$i | tr '=\-' '__')
+ case "$i" in
+ "llvm="*)
+ i="-m$i"
+ ;;
+ -m*)
+ ;;
+ *)
+ i="-f$i"
+ ;;
+ esac
+ AC_MSG_CHECKING([if $CC understands $i])
+ CFLAGS_1="$CFLAGS"
+ ENGINE_FLAGS_old="$ENGINE_FLAGS"
+ ENGINE_FLAGS="$ENGINE_FLAGS $i"
+ CFLAGS="$CFLAGS $ENGINE_FLAGS"
+ if test "$CROSS" = '#'
+ then
+ AC_RUN_IFELSE([AC_LANG_SOURCE([[int main(){ return 0; }]])],[eval $ac_i=yes;],[eval $ac_i=no; ENGINE_FLAGS="$ENGINE_FLAGS_old"])
+ else
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int main(){ return 0; }]])],[eval $ac_i=yes;],[eval $ac_i=no; ENGINE_FLAGS="$ENGINE_FLAGS_old"])
+ fi
+ CFLAGS="$CFLAGS_1"
+ ac_result=$(eval echo "\$$ac_i")
+ AC_MSG_RESULT($ac_result)
+done
# Check whether GCC understands __attribute__((unused))
AC_MSG_CHECKING([how to suppress 'unused variable' warnings])
@@ -755,27 +765,34 @@ if test -z "$skipcode"; then
skipcode=no
CFLAGS_1="$CFLAGS"
CFLAGS="$CFLAGS $ENGINE_FLAGS"
- for i in ".skip 16" ".block 16" ".org .+16" ".=.+16" ".space 16"
+ for i in ".skip 4" ".block 4" ".org .+4" ".=.+4" ".space 4" "$skipcode_arch"
do
AC_TRY_RUN(
-[int foo(int,int,int);
-main()
-{
- exit(foo(0,0,0)!=16);
-}
+[#include <stdio.h>
+#include <stdlib.h>
int foo(int x, int y, int z)
{
- static void *labels[]={&&label1, &&label2};
+ static void *labels[]={&&label1, &&label2, &&label3};
if (x) {
y++; /* workaround for http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12108 */
- label1:
- asm("$i"); /* or ".space 16" or somesuch */
- label2: ;
+ label1: asm("$i"); /* or ".space 4" or somesuch */
+ label2: asm("$i"); /* or ".space 4" or somesuch */
+ label3: ; /* workaround clang */
}
{
if (y) goto *labels[z]; /* workaround for gcc PR12108 */
return labels[1]-labels[0];
}
+}
+int main(int argc, char ** argv, char ** env)
+{
+ int skip=foo(0,0,0);
+ if(skip<4) {
+ char cmd[80];
+ snprintf(cmd, sizeof(cmd), "objdump -zl --disassemble=foo %s", argv[0]);
+ system(cmd);
+ }
+ return skip<4;
}]
,skipcode=$i; break
,,)
|
