Add include/libc-misc.h

Add include/libc-misc.h to provide miscellaneous definitions for both
glibc build and test:

1. Move inhibit_stack_protector to libc-misc.h and add Clang support.
2. Add test_inhibit_stack_protector for glibc testing.
3. Move inhibit_loop_to_libcall to libc-misc.h.
4. Add test_cc_inhibit_loop_to_libcall to handle TEST_CC != CC and
replace inhibit_loop_to_libcall with test_cc_inhibit_loop_to_libcall
in glibc tests.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Co-Authored-By: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Sam James <sam@gentoo.org>

config.h.in

@@ -43,13 +43,20 @@
 /* Define if the compiler supports __builtin_memset.  */
 #undef	HAVE_BUILTIN_MEMSET
 
-/* Define if compiler accepts -ftree-loop-distribute-patterns.  */
+/* Define if CC compiler accepts -ftree-loop-distribute-patterns.  */
 #undef  HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
 
-/* Define if compiler accepts -fno-stack-protector in an
+/* Define if TEST_CC compiler accepts -ftree-loop-distribute-patterns.  */
+#undef  HAVE_TEST_CC_INHIBIT_LOOP_TO_LIBCALL
+
+/* Define if CC compiler accepts -fno-stack-protector in an
    __attribute__ ((__optimize__)).  */
 #undef	HAVE_CC_NO_STACK_PROTECTOR
 
+/* Define if TEST_CC compiler accepts -fno-stack-protector in an
+   __attribute__ ((__optimize__)).  */
+#undef	HAVE_TEST_CC_NO_STACK_PROTECTOR
+
 /* The level of stack protection in use for glibc as a whole.
    May be overridden on a file-by-file basis.  */
 #ifndef STACK_PROTECTOR_LEVEL

configure

@@ -6069,13 +6069,14 @@ rm -f conftest*
 config_vars="$config_vars
 have-test-clangxx = $libc_cv_test_clangxx"
 
+
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -fstack-protector" >&5
 printf %s "checking for -fstack-protector... " >&6; }
 if test ${libc_cv_ssp+y}
 then :
   printf %s "(cached) " >&6
 else case e in #(
-  e) if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -Werror -fstack-protector -xc /dev/null -S -o /dev/null'
+  e) if { ac_try='${CC-cc} -Werror -fstack-protector -xc /dev/null -S -o /dev/null'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6086,12 +6087,44 @@ then :
 else case e in #(
   e) libc_cv_ssp=no ;;
 esac
-fi
+fi ;;
- ;;
 esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ssp" >&5
 printf "%s\n" "$libc_cv_ssp" >&6; }
+if test "$TEST_CC" = "$CC"; then
+  libc_cv_test_ssp=$libc_cv_ssp
+else
+
+saved_CC="$CC"
+CC="$TEST_CC"
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -fstack-protector in testing" >&5
+printf %s "checking for -fstack-protector in testing... " >&6; }
+if test ${libc_cv_test_ssp+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if { ac_try='${CC-cc} -Werror -fstack-protector -xc /dev/null -S -o /dev/null'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+then :
+  libc_cv_test_ssp=yes
+else case e in #(
+  e) libc_cv_test_ssp=no ;;
+esac
+fi ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_test_ssp" >&5
+printf "%s\n" "$libc_cv_test_ssp" >&6; }
+
+CC="$saved_CC"
+
+fi
+
 
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -fstack-protector-strong" >&5
 printf %s "checking for -fstack-protector-strong... " >&6; }
@@ -6148,6 +6181,11 @@ if test "$libc_cv_ssp" = yes; then
   printf "%s\n" "#define HAVE_CC_NO_STACK_PROTECTOR 1" >>confdefs.h
 
 fi
+if test "$libc_cv_test_ssp" = yes; then
+  printf "%s\n" "#define HAVE_TEST_CC_NO_STACK_PROTECTOR 1" >>confdefs.h
+
+fi
+
 
 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
   stack_protector="-fstack-protector"
@@ -7713,38 +7751,77 @@ CC="$saved_CC"
 config_vars="$config_vars
 test-config-cflags-float-store = $libc_cv_test_cc_float_store"
 
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if $CC accepts -fno-tree-loop-distribute-patterns with \
+conftest_code="
-__attribute__ ((__optimize__))" >&5
+void
-printf %s "checking if $CC accepts -fno-tree-loop-distribute-patterns with \
+__attribute__ ((__optimize__ (\"-fno-tree-loop-distribute-patterns\")))
-__attribute__ ((__optimize__))... " >&6; }
+foo (void) {}
+"
+
+cat > conftest.c <<EOF
+$conftest_code
+EOF
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if __attribute__ ((__optimize__(\"-fno-tree-loop-distribute-patterns\"))) works" >&5
+printf %s "checking if __attribute__ ((__optimize__(\"-fno-tree-loop-distribute-patterns\"))) works... " >&6; }
 if test ${libc_cv_cc_loop_to_function+y}
 then :
   printf %s "(cached) " >&6
 else case e in #(
-  e) cat > conftest.c <<EOF
+  e)   if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -c -Werror conftest.c -o conftest 1>&5'
-void
-__attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
-foo (void) {}
-EOF
-libc_cv_cc_loop_to_function=no
-if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; }
-then
+  then
-  libc_cv_cc_loop_to_function=yes
+    libc_cv_cc_loop_to_function=yes
-fi
+  else
-rm -f conftest* ;;
+    libc_cv_cc_loop_to_function=no
+  fi
+ ;;
 esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_loop_to_function" >&5
 printf "%s\n" "$libc_cv_cc_loop_to_function" >&6; }
+if test "$TEST_CC" = "$CC"; then
+  libc_cv_test_cc_loop_to_function=$libc_cv_cc_loop_to_function
+else
+
+saved_CC="$CC"
+CC="$TEST_CC"
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if __attribute__ ((__optimize__(\"-fno-tree-loop-distribute-patterns\"))) works in testing" >&5
+printf %s "checking if __attribute__ ((__optimize__(\"-fno-tree-loop-distribute-patterns\"))) works in testing... " >&6; }
+if test ${libc_cv_test_cc_loop_to_function+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e)       if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -c -Werror conftest.c -o conftest 1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+      then
+	libc_cv_test_cc_loop_to_function=yes
+      else
+	libc_cv_test_cc_loop_to_function=no
+      fi ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_test_cc_loop_to_function" >&5
+printf "%s\n" "$libc_cv_test_cc_loop_to_function" >&6; }
+
+CC="$saved_CC"
+
+fi
+rm -f conftest*
 if test $libc_cv_cc_loop_to_function = yes; then
   printf "%s\n" "#define HAVE_CC_INHIBIT_LOOP_TO_LIBCALL 1" >>confdefs.h
 
 fi
+if test $libc_cv_test_cc_loop_to_function = yes; then
+  printf "%s\n" "#define HAVE_TEST_CC_INHIBIT_LOOP_TO_LIBCALL 1" >>confdefs.h
+
+fi
 
 
 

configure.ac

@@ -665,11 +665,14 @@ LIBC_TRY_TEST_CXX_COMMAND([for clang++],
 )
 LIBC_CONFIG_VAR([have-test-clangxx], [$libc_cv_test_clangxx])
 
-AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
+LIBC_TRY_CC_AND_TEST_CC_OPTION([for -fstack-protector],
-LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
+  [-Werror -fstack-protector],
-		   [libc_cv_ssp=yes],
+  libc_cv_ssp,
-		   [libc_cv_ssp=no])
+  [libc_cv_ssp=yes],
-])
+  [libc_cv_ssp=no],
+  libc_cv_test_ssp,
+  [libc_cv_test_ssp=yes],
+  [libc_cv_test_ssp=no])
 
 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
@@ -689,6 +692,10 @@ if test "$libc_cv_ssp" = yes; then
   no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
   AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
 fi
+if test "$libc_cv_test_ssp" = yes; then
+  AC_DEFINE(HAVE_TEST_CC_NO_STACK_PROTECTOR)
+fi
+
 
 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
   stack_protector="-fstack-protector"
@@ -1506,22 +1513,26 @@ LIBC_TRY_TEST_CC_OPTION([for -ffloat-store],
 LIBC_CONFIG_VAR([test-config-cflags-float-store],
 		[$libc_cv_test_cc_float_store])
 
-AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
+conftest_code="
-__attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
-cat > conftest.c <<EOF
 void
-__attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
+__attribute__ ((__optimize__ (\"-fno-tree-loop-distribute-patterns\")))
 foo (void) {}
-EOF
+"
-libc_cv_cc_loop_to_function=no
+LIBC_TRY_CC_AND_TEST_CC_COMMAND([if __attribute__ ((__optimize__("-fno-tree-loop-distribute-patterns"))) works],
-if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
+  [$conftest_code],
-then
+  [-c -Werror],
-  libc_cv_cc_loop_to_function=yes
+  libc_cv_cc_loop_to_function,
-fi
+  [libc_cv_cc_loop_to_function=yes],
-rm -f conftest*])
+  [libc_cv_cc_loop_to_function=no],
+  libc_cv_test_cc_loop_to_function,
+  [libc_cv_test_cc_loop_to_function=yes],
+  [libc_cv_test_cc_loop_to_function=no])
 if test $libc_cv_cc_loop_to_function = yes; then
   AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
 fi
+if test $libc_cv_test_cc_loop_to_function = yes; then
+  AC_DEFINE(HAVE_TEST_CC_INHIBIT_LOOP_TO_LIBCALL)
+fi
 AC_SUBST(libc_cv_cc_loop_to_function)
 
 LIBC_TRY_CC_AND_TEST_CC_OPTION([for -Wimplicit-fallthrough],

include/libc-misc.h

@@ -0,0 +1,67 @@
+/* Miscellaneous definitions for both glibc build and test.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _INCLUDE_MISC_H
+#define _INCLUDE_MISC_H
+
+#include <config.h>
+
+/* Add the compiler optimization to inhibit loop transformation to library
+   calls.  This is used to avoid recursive calls in memset and memmove
+   default implementations in tests.  */
+#ifdef HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
+# define inhibit_loop_to_libcall \
+    __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
+#else
+# define inhibit_loop_to_libcall
+#endif
+
+#ifdef HAVE_TEST_CC_INHIBIT_LOOP_TO_LIBCALL
+# define test_cc_inhibit_loop_to_libcall \
+    __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
+#else
+# define test_cc_inhibit_loop_to_libcall
+#endif
+
+/* Used to disable stack protection in sensitive places, like ifunc
+   resolvers and early static TLS init.  */
+#ifdef __clang__
+# define cc_inhibit_stack_protector \
+    __attribute__((no_stack_protector))
+#else
+# define cc_inhibit_stack_protector \
+   __attribute__ ((__optimize__ ("-fno-stack-protector")))
+#endif
+
+#if IS_IN (testsuite) || IS_IN (testsuite_internal)
+# ifdef HAVE_TEST_CC_NO_STACK_PROTECTOR
+#  define test_inhibit_stack_protector cc_inhibit_stack_protector
+#  define inhibit_stack_protector cc_inhibit_stack_protector
+# else
+#  define test_inhibit_stack_protector
+#  define inhibit_stack_protector
+# endif
+#else
+# ifdef HAVE_CC_NO_STACK_PROTECTOR
+#  define inhibit_stack_protector cc_inhibit_stack_protector
+# else
+#  define test_inhibit_stack_protector
+# endif
+#endif
+
+#endif

include/libc-symbols.h

@@ -59,6 +59,8 @@
 # define IN_MODULE (-1)
 #endif
 
+#include <libc-misc.h>
+
 #ifndef _ISOMAC
 
 /* This is defined for the compilation of all C library code.  features.h
@@ -362,15 +364,6 @@ for linking")
 #define attribute_relro __attribute__ ((section (".data.rel.ro")))
 
 
-/* Used to disable stack protection in sensitive places, like ifunc
-   resolvers and early static TLS init.  */
-#ifdef HAVE_CC_NO_STACK_PROTECTOR
-# define inhibit_stack_protector \
-    __attribute__ ((__optimize__ ("-fno-stack-protector")))
-#else
-# define inhibit_stack_protector
-#endif
-
 /* The following macros are used for PLT bypassing within libc.so
    (and if needed other libraries similarly).
    First of all, you need to have the function prototyped somewhere,
@@ -804,16 +797,6 @@ for linking")
 #define libm_ifunc_init()
 #define libm_ifunc(name, expr)				\
   __ifunc (name, name, expr, void, libm_ifunc_init)
-
-/* Add the compiler optimization to inhibit loop transformation to library
-   calls.  This is used to avoid recursive calls in memset and memmove
-   default implementations.  */
-#ifdef HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
-# define inhibit_loop_to_libcall \
-    __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
-#else
-# define inhibit_loop_to_libcall
-#endif
 
 /* These macros facilitate sharing source files with gnulib.
 

string/test-memmove.c

@@ -47,7 +47,7 @@ IMPL (memmove, 1)
 
 /* Naive implementation to verify results.  */
 char *
-inhibit_loop_to_libcall
+test_cc_inhibit_loop_to_libcall
 simple_memmove (char *dst, const char *src, size_t n)
 {
   char *ret = dst;

string/test-memset.c

@@ -64,7 +64,7 @@ IMPL (MEMSET, 1)
 
 /* Naive implementation to verify results.  */
 CHAR *
-inhibit_loop_to_libcall
+test_cc_inhibit_loop_to_libcall
 SIMPLE_MEMSET (CHAR *s, int c, size_t n)
 {
   CHAR *r = s, *end = s + n;

string/test-string.h

@@ -40,16 +40,7 @@ extern impl_t __start_impls[], __stop_impls[];
 
 #undef __USE_STRING_INLINES
 
-/* We are compiled under _ISOMAC, so libc-symbols.h does not do this
+#include "libc-misc.h"
-   for us.  */
-#include "config.h"
-#ifdef HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
-# define inhibit_loop_to_libcall \
-    __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
-#else
-# define inhibit_loop_to_libcall
-#endif
-
 #include <getopt.h>
 #include <stdint.h>
 #include <stdio.h>