Merge branch 'develop' into bugfix/intel_warnings

1 files changed, 14 insertions, 87 deletions

diff --git a/config/gnu-flags b/config/gnu-flags
index bc120a8..16795d0 100644
--- a/config/gnu-flags
+++ b/config/gnu-flags
@@ -168,44 +168,15 @@ 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"
-    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"
+    # NOTE: Due to the divergence in the C and C++, we're dropping support for
+    # compiling the C library with a C++ compiler and dropping the -Wc++-compat
+    # warning.
+    H5_CFLAGS="$H5_CFLAGS -pedantic -Wall -Wextra -Wbad-function-cast -Wno-c++-compat -Wcast-align"
+    H5_CFLAGS="$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"
 
     ######################
     # Developer warnings #
@@ -254,34 +225,17 @@ 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"
-        #
-        # Lots of noise, questionable benefit:
-        #
-        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wlarger-than=2560"
-        #
+        H5_CFLAGS="$H5_CFLAGS -Wlogical-op -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 -Wpacked-bitfield-compat"
-        #
-        # Lots of noise, questionable benefit:
-        #
-        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wframe-larger-than=16384"
-        #
+        H5_CFLAGS="$H5_CFLAGS -Wsync-nand -Wframe-larger-than=16384 -Wpacked-bitfield-compat"
     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 -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="$DEVELOPER_WARNING_CFLAGS -Wjump-misses-init"
-        #
+        H5_CFLAGS="$H5_CFLAGS -Wstrict-overflow=5 -Wjump-misses-init -Wunsuffixed-float-constants"
     fi
 
     # gcc 4.6
@@ -293,17 +247,7 @@ 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 $cc_vers_minor -ge 7; then
-        #
-        # It's not clear that -Wvector-operation-performance warnings are
-        # actionable.
-        #
-        # -Wstack-usage=8192 warnings need better justification;
-        # if justifiable, should be enabled on a branch and swept up there
-        # before burdening the whole development team.
-        #
-        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wstack-usage=8192"
-        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wvector-operation-performance"
-
+        H5_CFLAGS="$H5_CFLAGS -Wstack-usage=8192 -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
@@ -322,21 +266,11 @@ 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 -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"
+        H5_CFLAGS="$H5_CFLAGS -Wnull-dereference -Wunused-const-variable -Wduplicated-cond -Whsa -Wnormalized"
     fi
 
     # gcc 7
@@ -347,13 +281,6 @@ 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"