Merged HDFFV-10929_2GB_testing to hdf5_1_12

1 files changed, 87 insertions, 11 deletions

diff --git a/config/gnu-flags b/config/gnu-flags
index 6355ccf..bc120a8 100644
--- a/config/gnu-flags
+++ b/config/gnu-flags
@@ -168,12 +168,44 @@ if test "X-gcc" = "X-$cc_vendor"; then
     # NOTE: Disable the -Wformat-nonliteral from -Wformat=2 here and re-add
     # it to the developer flags.
     #
-    H5_CFLAGS="$H5_CFLAGS -pedantic -Wall -Wextra -Wbad-function-cast -Wc++-compat -Wcast-align"
-    H5_CFLAGS="$H5_CFLAGS -Wcast-qual -Wconversion -Wdeclaration-after-statement -Wdisabled-optimization -Wfloat-equal"
-    H5_CFLAGS="$H5_CFLAGS -Wformat=2 -Wno-format-nonliteral -Winit-self -Winvalid-pch -Wmissing-declarations -Wmissing-include-dirs"
-    H5_CFLAGS="$H5_CFLAGS -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wpacked"
-    H5_CFLAGS="$H5_CFLAGS -Wredundant-decls -Wshadow -Wstrict-prototypes -Wswitch-enum -Wswitch-default"
-    H5_CFLAGS="$H5_CFLAGS -Wundef -Wunused-macros -Wunsafe-loop-optimizations -Wwrite-strings"
+    H5_CFLAGS="$H5_CFLAGS -pedantic -Wall -Wextra"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=bad-function-cast"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=cast-align"
+    H5_CFLAGS="$H5_CFLAGS -Wcast-qual -Wconversion"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=declaration-after-statement"
+    DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wdisabled-optimization"
+    H5_CFLAGS="$H5_CFLAGS -Wfloat-equal"
+    H5_CFLAGS="$H5_CFLAGS -Wformat=2 -Wno-format-nonliteral -Winit-self -Winvalid-pch"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=missing-declarations"
+    H5_CFLAGS="$H5_CFLAGS -Wmissing-include-dirs"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=missing-prototypes"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=nested-externs"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=old-style-definition"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=packed"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=redundant-decls"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=shadow"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=strict-prototypes"
+    DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wswitch-default"
+    DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wswitch-enum"
+    H5_CFLAGS="$H5_CFLAGS -Wundef"
+    DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wunused-macros"
+    DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wunsafe-loop-optimizations"
+    H5_CFLAGS="$H5_CFLAGS -Wwrite-strings"
+
+    #
+    # HDF5 code should not trigger the following warnings under any
+    # circumstances, so ask the compiler to treat them as errors:
+    #
+#   H5_ECFLAGS="$H5_ECFLAGS -Werror=discarded-qualifiers"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=implicit-function-declaration"
+    H5_CFLAGS="$H5_CFLAGS -Wmaybe-uninitialized"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=pointer-sign"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=pointer-to-int-cast"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=switch"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=unused-but-set-variable"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=unused-function"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=unused-parameter"
+    H5_ECFLAGS="$H5_ECFLAGS -Werror=unused-variable"
 
     ######################
     # Developer warnings #
@@ -222,17 +254,34 @@ if test "X-gcc" = "X-$cc_vendor"; then
 
     # gcc 4.3                                                                    
     if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 3; then
-        H5_CFLAGS="$H5_CFLAGS -Wlogical-op -Wlarger-than=2560"                   
+        H5_CFLAGS="$H5_CFLAGS -Wlogical-op"
+        #
+        # Lots of noise, questionable benefit:
+        #
+        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wlarger-than=2560"
+        #
     fi 
 
     # gcc 4.4
     if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 4; then
-        H5_CFLAGS="$H5_CFLAGS -Wsync-nand -Wframe-larger-than=16384 -Wpacked-bitfield-compat"
+        H5_CFLAGS="$H5_CFLAGS -Wsync-nand -Wpacked-bitfield-compat"
+        #
+        # Lots of noise, questionable benefit:
+        #
+        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wframe-larger-than=16384"
+        #
     fi
 
     # gcc 4.5
     if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 5; then
-        H5_CFLAGS="$H5_CFLAGS -Wstrict-overflow=5 -Wjump-misses-init -Wunsuffixed-float-constants"
+        H5_CFLAGS="$H5_CFLAGS -Wstrict-overflow=5 -Wunsuffixed-float-constants"
+        #
+        # -Wjump-misses-init makes lots of noise for a questionable benefit.
+        # Can jumping over an initialization in C cause any harm, if
+        # the variable is never *used* before it has been initialized?
+        #
+        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wjump-misses-init"
+        #
     fi
 
     # gcc 4.6
@@ -244,7 +293,17 @@ if test "X-gcc" = "X-$cc_vendor"; then
 
     # gcc 4.7
     if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 7; then
-        H5_CFLAGS="$H5_CFLAGS -Wstack-usage=8192 -Wvector-operation-performance"
+        #
+        # It's not clear that -Wvector-operation-performance warnings are
+        # actionable.
+        #
+        # -Wstack-usage=8192 warnings need better justification;
+        # if justifiable, should be enabled on a branch and swept up there
+        # before burdening the whole development team.
+        #
+        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wstack-usage=8192"
+        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wvector-operation-performance"
+
         DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wsuggest-attribute=pure -Wsuggest-attribute=noreturn"
         NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS -Wno-suggest-attribute=pure -Wno-suggest-attribute=noreturn"
     fi
@@ -263,11 +322,21 @@ if test "X-gcc" = "X-$cc_vendor"; then
     # gcc 5
     if test $cc_vers_major -ge 5; then
         H5_CFLAGS="$H5_CFLAGS -Warray-bounds=2 -Wc99-c11-compat"
+        H5_ECFLAGS="$H5_ECFLAGS -Werror=incompatible-pointer-types"
     fi
 
     # gcc 6
     if test $cc_vers_major -ge 6; then
-        H5_CFLAGS="$H5_CFLAGS -Wnull-dereference -Wunused-const-variable -Wduplicated-cond -Whsa -Wnormalized"
+        H5_CFLAGS="$H5_CFLAGS -Wunused-const-variable -Whsa -Wnormalized"
+        #
+        # Unacceptably noisy on HDF5 right now.
+        #
+        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wnull-dereference"
+        #
+        # Careful!  -Wduplicated-cond, combined with HDF5's heavy use of
+        # macros, can make a lot of noise.
+        #
+        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wduplicated-cond"
     fi
 
     # gcc 7
@@ -278,6 +347,13 @@ if test "X-gcc" = "X-$cc_vendor"; then
 
     # gcc 8
     if test $cc_vers_major -ge 8; then
+        # For GCC 8, promote maybe-initialized warnings to an error.  GCC 8
+        # reports 0 maybe-uninitialized warnings where earlier versions
+        # make many false reports.  GCC 8 seems to analyze calls to static
+        # in order to detect initializations that occur there.  It's possible
+        # that GCC 8 only performs that analysis at -O3, though.
+        H5_ECFLAGS="$H5_ECFLAGS -Werror=maybe-uninitialized"
+        H5_ECFLAGS="$H5_ECFLAGS -Werror=cast-function-type"
         DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wstringop-overflow=4 -Wsuggest-attribute=cold -Wsuggest-attribute=malloc"
         NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS -Wno-suggest-attribute=cold -Wno-suggest-attribute=malloc"
         H5_CFLAGS="$H5_CFLAGS -Wattribute-alias -Wcast-align=strict -Wshift-overflow=2"