gprofng: Don't hardcode -Wno-nonnull-compare

Use -Wno-nonnull-compare only if it is supported.

	PR gprof/28969
	* libcollector/Makefile.am (AM_CFLAGS): Replace
	-Wno-nonnull-compare with GPROFNG_NO_NONNULL_COMPARE_CFLAGS.
	* libcollector/configure.ac (GPROFNG_NO_NONNULL_COMPARE_CFLAGS):
	New AC_SUBST for -Wno-nonnull-compare.
	* libcollector/Makefile.in: Regenerate.
	* libcollector/aclocal.m4: Likewise.
	* libcollector/configure: Likewise.

5 files changed, 69 insertions, 4 deletions

diff --git a/gprofng/libcollector/Makefile.am b/gprofng/libcollector/Makefile.am
index a41b920..901d9a5 100644
--- a/gprofng/libcollector/Makefile.am
+++ b/gprofng/libcollector/Makefile.am
@@ -41,7 +41,7 @@ CSOURCES = \
 	collector.c \
 	$(NULL)
 
-AM_CFLAGS = $(GPROFNG_CFLAGS) -Wno-nonnull-compare
+AM_CFLAGS = $(GPROFNG_CFLAGS) $(GPROFNG_NO_NONNULL_COMPARE_CFLAGS)
 AM_CPPFLAGS = $(GPROFNG_CPPFLAGS) -I.. -I$(srcdir) \
 	-I$(srcdir)/../common -I$(srcdir)/../src \
 	-I$(srcdir)/../../include
diff --git a/gprofng/libcollector/Makefile.in b/gprofng/libcollector/Makefile.in
index f9ed2d9..55039aa 100644
--- a/gprofng/libcollector/Makefile.in
+++ b/gprofng/libcollector/Makefile.in
@@ -324,6 +324,7 @@ ECHO_T = @ECHO_T@
 EGREP = @EGREP@
 EXEEXT = @EXEEXT@
 FGREP = @FGREP@
+GPROFNG_NO_NONNULL_COMPARE_CFLAGS = @GPROFNG_NO_NONNULL_COMPARE_CFLAGS@
 GPROFNG_VARIANT = @GPROFNG_VARIANT@
 GREP = @GREP@
 INSTALL = @INSTALL@
@@ -437,7 +438,7 @@ CSOURCES = \
 	collector.c \
 	$(NULL)
 
-AM_CFLAGS = $(GPROFNG_CFLAGS) -Wno-nonnull-compare
+AM_CFLAGS = $(GPROFNG_CFLAGS) $(GPROFNG_NO_NONNULL_COMPARE_CFLAGS)
 AM_CPPFLAGS = $(GPROFNG_CPPFLAGS) -I.. -I$(srcdir) \
 	-I$(srcdir)/../common -I$(srcdir)/../src \
 	-I$(srcdir)/../../include
diff --git a/gprofng/libcollector/aclocal.m4 b/gprofng/libcollector/aclocal.m4
index b269c73..2d13dba 100644
--- a/gprofng/libcollector/aclocal.m4
+++ b/gprofng/libcollector/aclocal.m4
@@ -1230,6 +1230,7 @@ AC_SUBST([am__untar])
 m4_include([../../config/depstand.m4])
 m4_include([../../config/lead-dot.m4])
 m4_include([../../config/override.m4])
+m4_include([../../config/warnings.m4])
 m4_include([../../libtool.m4])
 m4_include([../../ltoptions.m4])
 m4_include([../../ltsugar.m4])
diff --git a/gprofng/libcollector/configure b/gprofng/libcollector/configure
index 887d271..5a85365 100755
--- a/gprofng/libcollector/configure
+++ b/gprofng/libcollector/configure
@@ -634,6 +634,7 @@ am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
 CLOCK_GETTIME_LINK
+GPROFNG_NO_NONNULL_COMPARE_CFLAGS
 GPROFNG_VARIANT
 CXXCPP
 OTOOL64
@@ -12014,7 +12015,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12017 "configure"
+#line 12018 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12120,7 +12121,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12123 "configure"
+#line 12124 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -15438,6 +15439,65 @@ case "${target}" in
 esac
 
 
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+GPROFNG_NO_NONNULL_COMPARE_CFLAGS=
+save_CFLAGS="$CFLAGS"
+for real_option in -Wno-nonnull-compare; do
+  # Do the check with the no- prefix removed since gcc silently
+  # accepts any -Wno-* option on purpose
+  case $real_option in
+    -Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;;
+    *) option=$real_option ;;
+  esac
+  as_acx_Woption=`$as_echo "acx_cv_prog_cc_warning_$option" | $as_tr_sh`
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports $option" >&5
+$as_echo_n "checking whether $CC supports $option... " >&6; }
+if eval \${$as_acx_Woption+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  CFLAGS="$option"
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "$as_acx_Woption=yes"
+else
+  eval "$as_acx_Woption=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+fi
+eval ac_res=\$$as_acx_Woption
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  if test `eval 'as_val=${'$as_acx_Woption'};$as_echo "$as_val"'` = yes; then :
+  GPROFNG_NO_NONNULL_COMPARE_CFLAGS="$GPROFNG_NO_NONNULL_COMPARE_CFLAGS${GPROFNG_NO_NONNULL_COMPARE_CFLAGS:+ }$real_option"
+fi
+  done
+CFLAGS="$save_CFLAGS"
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+
+
 clock_gettime_link=
 # At least for glibc, clock_gettime is in librt.  But don't
 # pull that in if it still doesn't give us the function we want.  This
diff --git a/gprofng/libcollector/configure.ac b/gprofng/libcollector/configure.ac
index bc8c3f1..d82733f 100644
--- a/gprofng/libcollector/configure.ac
+++ b/gprofng/libcollector/configure.ac
@@ -54,6 +54,9 @@ case "${target}" in
 esac
 AC_SUBST(GPROFNG_VARIANT)
 
+ACX_PROG_CC_WARNING_OPTS([-Wno-nonnull-compare], [GPROFNG_NO_NONNULL_COMPARE_CFLAGS])
+AC_SUBST(GPROFNG_NO_NONNULL_COMPARE_CFLAGS)
+
 clock_gettime_link=
 # At least for glibc, clock_gettime is in librt.  But don't
 # pull that in if it still doesn't give us the function we want.  This