# HG changeset patch
# User ihse
# Date 1537558512 -7200
# Node ID ab54a4d61d7fe4795d29497034aac72b0cae2291
# Parent  f8af1f1f3518be87ce2f8923e1d6e1e747cf8566
8210988: Improved handling of compiler warnings in the build
Reviewed-by: erikj

diff -r f8af1f1f3518 -r ab54a4d61d7f make/autoconf/flags-cflags.m4
--- a/make/autoconf/flags-cflags.m4	Fri Sep 21 12:08:13 2018 -0700
+++ b/make/autoconf/flags-cflags.m4	Fri Sep 21 21:35:12 2018 +0200
@@ -161,14 +161,31 @@
     microsoft)
       DISABLE_WARNING_PREFIX="-wd"
       CFLAGS_WARNINGS_ARE_ERRORS="-WX"
+
+      WARNINGS_ENABLE_ALL="-W3"
+      DISABLED_WARNINGS="4800"
       ;;
+
     solstudio)
       DISABLE_WARNING_PREFIX="-erroff="
-      CFLAGS_WARNINGS_ARE_ERRORS="-errtags -errwarn=%all"
+      CFLAGS_WARNINGS_ARE_ERRORS="-errwarn=%all"
+
+      WARNINGS_ENABLE_ALL_CFLAGS="-v"
+      WARNINGS_ENABLE_ALL_CXXFLAGS="+w"
+
+      DISABLED_WARNINGS_C=""
+      DISABLED_WARNINGS_CXX=""
       ;;
+
     gcc)
       DISABLE_WARNING_PREFIX="-Wno-"
       CFLAGS_WARNINGS_ARE_ERRORS="-Werror"
+
+      WARNINGS_ENABLE_ALL="-Wall -Wextra -Wformat=2"
+      WARNINGS_ENABLE_ADDITIONAL_JVM="-Wpointer-arith -Wsign-compare -Wunused-function -Wundef -Wunused-value -Woverloaded-virtual -Wreorder -Wreturn-type"
+
+      DISABLED_WARNINGS="unused-parameter unused"
+
       # Repeate the check for the BUILD_CC and BUILD_CXX. Need to also reset
       # CFLAGS since any target specific flags will likely not work with the
       # build compiler
@@ -183,18 +200,32 @@
       CXX="$CXX_OLD"
       CFLAGS="$CFLAGS_OLD"
       ;;
+
     clang)
       DISABLE_WARNING_PREFIX="-Wno-"
       CFLAGS_WARNINGS_ARE_ERRORS="-Werror"
+
+      WARNINGS_ENABLE_ALL="-Wall -Wextra -Wformat=2"
+      WARNINGS_ENABLE_ADDITIONAL_JVM="-Wpointer-arith -Wsign-compare -Wunused-function -Wundef -Wunused-value -Woverloaded-virtual -Wreorder"
+
+      DISABLED_WARNINGS="unused-parameter unused"
       ;;
+
     xlc)
       DISABLE_WARNING_PREFIX="-qsuppress="
       CFLAGS_WARNINGS_ARE_ERRORS="-qhalt=w"
+
+      # Possibly a better subset than "all" is "lan:trx:ret:zea:cmp:ret"
+      WARNINGS_ENABLE_ALL="-qinfo=all -qformat=all"
+      DISABLED_WARNINGS=""
       ;;
   esac
   AC_SUBST(DISABLE_WARNING_PREFIX)
   AC_SUBST(BUILD_CC_DISABLE_WARNING_PREFIX)
   AC_SUBST(CFLAGS_WARNINGS_ARE_ERRORS)
+  AC_SUBST(DISABLED_WARNINGS)
+  AC_SUBST(DISABLED_WARNINGS_C)
+  AC_SUBST(DISABLED_WARNINGS_CXX)
 ])
 
 AC_DEFUN([FLAGS_SETUP_QUALITY_CHECKS],
@@ -512,11 +543,14 @@
       TOOLCHAIN_CFLAGS_JDK_CONLY="-fno-strict-aliasing" # technically NOT for CXX
     fi
   elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
-    TOOLCHAIN_CFLAGS_JDK="-mt"
-    TOOLCHAIN_CFLAGS_JDK_CONLY="-xc99=%none -xCC -Xa -v -W0,-noglobal" # C only
+    TOOLCHAIN_FLAGS="-errtags -errfmt"
+    TOOLCHAIN_CFLAGS="-errshort=tags"
+
+    TOOLCHAIN_CFLAGS_JDK="-mt $TOOLCHAIN_FLAGS"
+    TOOLCHAIN_CFLAGS_JDK_CONLY="-xc99=%none -xCC -Xa -W0,-noglobal $TOOLCHAIN_CFLAGS" # C only
     TOOLCHAIN_CFLAGS_JDK_CXXONLY="-features=no%except -norunpath -xnolib" # CXX only
     TOOLCHAIN_CFLAGS_JVM="-template=no%extdef -features=no%split_init \
-        -library=stlport4 -mt -features=no%except"
+        -library=stlport4 -mt -features=no%except $TOOLCHAIN_FLAGS"
     if test "x$DEBUG_LEVEL" = xslowdebug; then
       # Previously -g was used instead of -g0 for slowdebug; this is equivalent
       # to setting +d.
@@ -524,6 +558,7 @@
     fi
 
   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
+    # Suggested additions: -qsrcmsg to get improved error reporting
     TOOLCHAIN_CFLAGS_JDK="-qchars=signed -qfullpath -qsaveopt"  # add on both CFLAGS
     TOOLCHAIN_CFLAGS_JVM="-qtune=balanced \
         -qalias=noansi -qstrict -qtls=default -qlanglvl=c99vla \
@@ -535,37 +570,26 @@
 
   # CFLAGS WARNINGS STUFF
   # Set JVM_CFLAGS warning handling
-  if test "x$TOOLCHAIN_TYPE" = xgcc || test "x$TOOLCHAIN_TYPE" = xclang; then
-    # COMMON to gcc and clang
-    WARNING_CFLAGS_JVM="-Wpointer-arith -Wsign-compare -Wunused-function"
-    if ! HOTSPOT_CHECK_JVM_VARIANT(zero); then
-      # Non-zero builds have stricter warnings
-      WARNING_CFLAGS_JVM="$WARNING_CFLAGS_JVM -Wundef -Wformat=2"
-    fi
-
-  fi
   if test "x$TOOLCHAIN_TYPE" = xgcc; then
-    WARNING_CFLAGS_JDK="-Wall -Wextra -Wno-unused -Wno-unused-parameter -Wformat=2"
-    WARNING_CFLAGS_JVM="$WARNING_CFLAGS_JVM -Wunused-value -Woverloaded-virtual -Wreorder"
+    WARNING_CFLAGS_JDK="$WARNINGS_ENABLE_ALL"
+    WARNING_CFLAGS_JVM="$WARNINGS_ENABLE_ALL $WARNINGS_ENABLE_ADDITIONAL_JVM"
 
-    if ! HOTSPOT_CHECK_JVM_VARIANT(zero); then
-      # Non-zero builds have stricter warnings
-      WARNING_CFLAGS_JVM="$WARNING_CFLAGS_JVM -Wreturn-type"
-    fi
   elif test "x$TOOLCHAIN_TYPE" = xclang; then
-    WARNING_CFLAGS_JVM="$WARNING_CFLAGS_JVM -Wno-deprecated -Wreorder"
     if test "x$OPENJDK_TARGET_OS" = xlinux; then
-      WARNING_CFLAGS_JVM="$WARNING_CFLAGS_JVM -Wno-sometimes-uninitialized"
-      WARNING_CFLAGS_JDK="-Wall -Wextra -Wno-unused -Wno-unused-parameter -Wformat=2"
+      WARNING_CFLAGS_JDK="$WARNINGS_ENABLE_ALL"
+    else
+      WARNING_CFLAGS_JDK="" # currently left empty
     fi
+    WARNING_CFLAGS_JVM="$WARNINGS_ENABLE_ALL $WARNINGS_ENABLE_ADDITIONAL_JVM"
+
   elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
-    WARNING_CFLAGS_JDK_CONLY="-errshort=tags"
-    WARNING_CFLAGS_JDK_CXXONLY="+w"
-    WARNING_CFLAGS_JDK="-errtags=yes -errfmt"
+    WARNING_CFLAGS_JDK_CONLY="$WARNINGS_ENABLE_ALL_CFLAGS"
+    WARNING_CFLAGS_JDK_CXXONLY="$WARNINGS_ENABLE_ALL_CXXFLAGS"
+    WARNING_CFLAGS_JVM="" # currently left empty
   elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
-    WARNING_CFLAGS="-W3"
-    WARNING_CFLAGS_JDK="-wd4800"
-    WARNING_CFLAGS_JVM="-wd4800"
+    WARNING_CFLAGS="$WARNINGS_ENABLE_ALL"
+  elif test "x$TOOLCHAIN_TYPE" = xxlc; then
+    WARNING_CFLAGS=""  # currently left empty
   fi
 
   # Set some additional per-OS defines.
diff -r f8af1f1f3518 -r ab54a4d61d7f make/autoconf/flags-ldflags.m4
--- a/make/autoconf/flags-ldflags.m4	Fri Sep 21 12:08:13 2018 -0700
+++ b/make/autoconf/flags-ldflags.m4	Fri Sep 21 21:35:12 2018 +0200
@@ -139,6 +139,14 @@
     fi
   fi
 
+  # Setup warning flags
+  if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
+    LDFLAGS_WARNINGS_ARE_ERRORS="-Wl,-z,fatal-warnings"
+  else
+    LDFLAGS_WARNINGS_ARE_ERRORS=""
+  fi
+  AC_SUBST(LDFLAGS_WARNINGS_ARE_ERRORS)
+
   # Setup LDFLAGS for linking executables
   if test "x$TOOLCHAIN_TYPE" = xgcc; then
     EXECUTABLE_LDFLAGS="$EXECUTABLE_LDFLAGS -Wl,--allow-shlib-undefined"
diff -r f8af1f1f3518 -r ab54a4d61d7f make/autoconf/spec.gmk.in
--- a/make/autoconf/spec.gmk.in	Fri Sep 21 12:08:13 2018 -0700
+++ b/make/autoconf/spec.gmk.in	Fri Sep 21 21:35:12 2018 +0200
@@ -423,6 +423,10 @@
 
 DISABLE_WARNING_PREFIX := @DISABLE_WARNING_PREFIX@
 CFLAGS_WARNINGS_ARE_ERRORS:=@CFLAGS_WARNINGS_ARE_ERRORS@
+LDFLAGS_WARNINGS_ARE_ERRORS:=@LDFLAGS_WARNINGS_ARE_ERRORS@
+DISABLED_WARNINGS := @DISABLED_WARNINGS@
+DISABLED_WARNINGS_C := @DISABLED_WARNINGS_C@
+DISABLED_WARNINGS_CXX := @DISABLED_WARNINGS_CXX@
 
 # A global flag (true or false) determining if native warnings are considered errors.
 WARNINGS_AS_ERRORS := @WARNINGS_AS_ERRORS@
diff -r f8af1f1f3518 -r ab54a4d61d7f make/common/NativeCompilation.gmk
--- a/make/common/NativeCompilation.gmk	Fri Sep 21 12:08:13 2018 -0700
+++ b/make/common/NativeCompilation.gmk	Fri Sep 21 21:35:12 2018 +0200
@@ -594,9 +594,13 @@
   # Pick up disabled warnings, if possible on this platform.
   ifneq ($(DISABLE_WARNING_PREFIX), )
     $1_EXTRA_CFLAGS += $$(addprefix $(DISABLE_WARNING_PREFIX), \
+        $$(DISABLED_WARNINGS) \
+        $$(DISABLED_WARNINGS_C) \
         $$($1_DISABLED_WARNINGS_$(TOOLCHAIN_TYPE)) \
         $$($1_DISABLED_WARNINGS_C_$(TOOLCHAIN_TYPE)))
     $1_EXTRA_CXXFLAGS += $$(addprefix $(DISABLE_WARNING_PREFIX), \
+        $$(DISABLED_WARNINGS) \
+        $$(DISABLED_WARNINGS_CXX) \
         $$($1_DISABLED_WARNINGS_$(TOOLCHAIN_TYPE)) \
         $$($1_DISABLED_WARNINGS_CXX_$(TOOLCHAIN_TYPE)))
   endif
@@ -614,6 +618,7 @@
   ifeq ($$($1_WARNINGS_AS_ERRORS_$(TOOLCHAIN_TYPE)), true)
     $1_EXTRA_CFLAGS += $(CFLAGS_WARNINGS_ARE_ERRORS)
     $1_EXTRA_CXXFLAGS += $(CFLAGS_WARNINGS_ARE_ERRORS)
+    $1_EXTRA_LDFLAGS += $(LDFLAGS_WARNINGS_ARE_ERRORS)
   endif
 
   ifeq (NONE, $$($1_OPTIMIZATION))
@@ -780,8 +785,8 @@
 
   # Pickup extra OPENJDK_TARGET_OS_TYPE and/or OPENJDK_TARGET_OS dependent variables
   # for LDFLAGS and LIBS
-  $1_EXTRA_LDFLAGS := $$($1_LDFLAGS_$(OPENJDK_TARGET_OS_TYPE)) $$($1_LDFLAGS_$(OPENJDK_TARGET_OS))
-  $1_EXTRA_LIBS := $$($1_LIBS_$(OPENJDK_TARGET_OS_TYPE)) $$($1_LIBS_$(OPENJDK_TARGET_OS))
+  $1_EXTRA_LDFLAGS += $$($1_LDFLAGS_$(OPENJDK_TARGET_OS_TYPE)) $$($1_LDFLAGS_$(OPENJDK_TARGET_OS))
+  $1_EXTRA_LIBS += $$($1_LIBS_$(OPENJDK_TARGET_OS_TYPE)) $$($1_LIBS_$(OPENJDK_TARGET_OS))
   ifneq ($$($1_REAL_MAPFILE), )
     $1_EXTRA_LDFLAGS += $(call SET_SHARED_LIBRARY_MAPFILE,$$($1_REAL_MAPFILE))
   endif
diff -r f8af1f1f3518 -r ab54a4d61d7f make/hotspot/lib/CompileGtest.gmk
--- a/make/hotspot/lib/CompileGtest.gmk	Fri Sep 21 12:08:13 2018 -0700
+++ b/make/hotspot/lib/CompileGtest.gmk	Fri Sep 21 21:35:12 2018 +0200
@@ -73,11 +73,14 @@
     CFLAGS_windows := -EHsc, \
     CFLAGS_solaris := -DGTEST_HAS_EXCEPTIONS=0 -library=stlport4, \
     CFLAGS_macosx := -DGTEST_OS_MAC=1, \
-    DISABLED_WARNINGS_gcc := undef, \
-    DISABLED_WARNINGS_clang := undef switch format-nonliteral \
-        tautological-undefined-compare $(BUILD_LIBJVM_DISABLED_WARNINGS_clang), \
-    DISABLED_WARNINGS_solstudio := identexpected, \
-    DISABLED_WARNINGS_CXX_microsoft := 4996, \
+    DISABLED_WARNINGS_gcc := $(DISABLED_WARNINGS_gcc) \
+        undef, \
+    DISABLED_WARNINGS_clang := $(DISABLED_WARNINGS_clang) \
+        undef switch format-nonliteral tautological-undefined-compare, \
+    DISABLED_WARNINGS_solstudio := $(DISABLED_WARNINGS_solstudio) \
+        identexpected, \
+    DISABLED_WARNINGS_microsoft := $(DISABLED_WARNINGS_microsoft) \
+        4996, \
     LDFLAGS := $(JVM_LDFLAGS), \
     LDFLAGS_solaris := -library=stlport4 $(call SET_SHARED_LIBRARY_ORIGIN), \
     LIBS := $(JVM_LIBS), \
diff -r f8af1f1f3518 -r ab54a4d61d7f make/hotspot/lib/CompileJvm.gmk
--- a/make/hotspot/lib/CompileJvm.gmk	Fri Sep 21 12:08:13 2018 -0700
+++ b/make/hotspot/lib/CompileJvm.gmk	Fri Sep 21 21:35:12 2018 +0200
@@ -80,6 +80,25 @@
     #
 
 ################################################################################
+# Disabled warnings
+
+DISABLED_WARNINGS_gcc := extra all
+ifeq ($(call check-jvm-feature, zero), true)
+  DISABLED_WARNINGS_gcc += return-type
+endif
+
+DISABLED_WARNINGS_clang := extra all tautological-compare deprecated-declarations
+
+DISABLED_WARNINGS_solstudio :=
+
+DISABLED_WARNINGS_xlc := 1540-0216 1540-0198 1540-1090 1540-1639 1540-1088 \
+    1500-010
+
+DISABLED_WARNINGS_microsoft :=
+
+
+
+################################################################################
 # Platform specific setup
 
 # ARM source selection
@@ -115,7 +134,7 @@
   endif
   # Exclude warnings in devstudio 12.6
   ifeq ($(CC_VERSION_NUMBER), 5.15)
-    DISABLED_WARNINGS_solstudio := SEC_ARR_OUTSIDE_BOUND_READ \
+    DISABLED_WARNINGS_solstudio += SEC_ARR_OUTSIDE_BOUND_READ \
       SEC_ARR_OUTSIDE_BOUND_WRITE
   endif
 endif
@@ -158,10 +177,11 @@
     CFLAGS := $(JVM_CFLAGS), \
     vm_version.cpp_CXXFLAGS := $(CFLAGS_VM_VERSION), \
     arguments.cpp_CXXFLAGS := $(CFLAGS_VM_VERSION), \
-    DISABLED_WARNINGS_clang := tautological-compare, \
+    DISABLED_WARNINGS_gcc := $(DISABLED_WARNINGS_gcc), \
+    DISABLED_WARNINGS_clang := $(DISABLED_WARNINGS_clang), \
     DISABLED_WARNINGS_solstudio := $(DISABLED_WARNINGS_solstudio), \
-    DISABLED_WARNINGS_xlc := 1540-0216 1540-0198 1540-1090 1540-1639 \
-        1540-1088 1500-010, \
+    DISABLED_WARNINGS_xlc := $(DISABLED_WARNINGS_xlc), \
+    DISABLED_WARNINGS_microsoft := $(DISABLED_WARNINGS_microsoft), \
     ASFLAGS := $(JVM_ASFLAGS), \
     LDFLAGS := $(JVM_LDFLAGS), \
     LIBS := $(JVM_LIBS), \