diff options
author | Peter Wu <peter@lekensteyn.nl> | 2015-11-26 11:26:13 +0100 |
---|---|---|
committer | Alexis La Goutte <alexis.lagoutte@gmail.com> | 2015-11-26 13:02:42 +0000 |
commit | 470c745a7a0a5b930bdfb0edd8874436cb9beea0 (patch) | |
tree | 8dbb5e741f8143705a5d8f55f769055756d5f647 /acinclude.m4 | |
parent | a198f47c06723fabef174cb3983b26ead24f5bc9 (diff) |
autotools: do not apply CFLAGS in reverse order
Fixes false "-Wvariadic-macros" because "-Wpedantic" came after
"-Wno-variadic-macros". While at it, avoid (unintentionally?) adding
-fPIE to all C++ programs (via CXXFLAGS).
Availability of flags is checked by appending a flag (in case the user
has something like CFLAGS=-Wno-error).
This removes a -fPIE check for CXXFLAGS and removes 5
-Woverlength-strings and 9 -Wvariadic-macros warnings from make with
Clang 3.7.0. configure and compile times were equal. (A diff between the
configure outputs showed no other changes.)
This reverts commit cf0d762d7304aa569ea25faf999c74bbe94f9023 and applies
a different approach.
Ping-Bug: 10791
Change-Id: Ic7b4137e2d98b06bc7625091be9bc7dd69182586
Reviewed-on: https://code.wireshark.org/review/12175
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Diffstat (limited to 'acinclude.m4')
-rw-r--r-- | acinclude.m4 | 42 |
1 files changed, 22 insertions, 20 deletions
diff --git a/acinclude.m4 b/acinclude.m4 index 14e39c43cc..1851503956 100644 --- a/acinclude.m4 +++ b/acinclude.m4 @@ -1532,7 +1532,9 @@ AC_DEFUN([AC_WIRESHARK_CHECK_NON_CXX_WARNING_OPTION_ERROR], # # The macro first determines if the compiler supports GCC-style flags. # Then it attempts to compile with the defined cflags. The defined -# flags are added to CFLAGS only if the compilation succeeds. +# flags are added to WS_CHECKED_CFLAGS only if the compilation succeeds. +# CFLAGS remains unchanged. can_add_to_cflags is set to "no" when the +# flag is checked but unavailable. (Like-wise for CXXFLAGS.) # # We do this because not all such options are necessarily supported by # the version of the particular compiler we're using. @@ -1560,17 +1562,18 @@ if test "x$ac_supports_gcc_flags" = "xyes" ; then # AC_MSG_CHECKING(whether we can add $GCC_OPTION to CFLAGS) CFLAGS_saved="$CFLAGS" + CFLAGS="$WS_CHECKED_CFLAGS $CFLAGS" if expr "x$GCC_OPTION" : "x-W.*" >/dev/null then - CFLAGS="$ac_wireshark_unknown_warning_option_error $GCC_OPTION $CFLAGS" + CFLAGS="$CFLAGS $ac_wireshark_unknown_warning_option_error $GCC_OPTION" elif expr "x$GCC_OPTION" : "x-f.*" >/dev/null then - CFLAGS="-Werror $GCC_OPTION $CFLAGS" + CFLAGS="$CFLAGS -Werror $GCC_OPTION" elif expr "x$GCC_OPTION" : "x-m.*" >/dev/null then - CFLAGS="-Werror $GCC_OPTION $CFLAGS" + CFLAGS="$CFLAGS -Werror $GCC_OPTION" else - CFLAGS="$GCC_OPTION $CFLAGS" + CFLAGS="$CFLAGS $GCC_OPTION" fi AC_COMPILE_IFELSE( [ @@ -1591,7 +1594,7 @@ if test "x$ac_supports_gcc_flags" = "xyes" ; then CFLAGS="$CFLAGS -Werror" AC_MSG_CHECKING(whether $GCC_OPTION $4) AC_COMPILE_IFELSE( - [AC_LANG_SOURCE($3)], + [AC_LANG_SOURCE($3)], [ AC_MSG_RESULT(no) # @@ -1599,19 +1602,18 @@ if test "x$ac_supports_gcc_flags" = "xyes" ; then # added them, by setting CFLAGS to the saved value plus # just the new option. # - CFLAGS="$GCC_OPTION $CFLAGS_saved" + WS_CHECKED_CFLAGS="$WS_CHECKED_CFLAGS $GCC_OPTION" if test "$CC" = "$CC_FOR_BUILD"; then # # We're building the build tools with the same compiler # with which we're building Wireshark, so add the flags # to the flags for that compiler as well. # - CFLAGS_FOR_BUILD="$GCC_OPTION $CFLAGS_FOR_BUILD" + CFLAGS_FOR_BUILD="$CFLAGS_FOR_BUILD $GCC_OPTION" fi ], [ AC_MSG_RESULT(yes) - CFLAGS="$CFLAGS_saved" ]) else # @@ -1619,22 +1621,22 @@ if test "x$ac_supports_gcc_flags" = "xyes" ; then # added them, by setting CFLAGS to the saved value plus # just the new option. # - CFLAGS="$GCC_OPTION $CFLAGS_saved" + WS_CHECKED_CFLAGS="$WS_CHECKED_CFLAGS $GCC_OPTION" if test "$CC" = "$CC_FOR_BUILD"; then # # We're building the build tools with the same compiler # with which we're building Wireshark, so add the flags # to the flags for that compiler as well. # - CFLAGS_FOR_BUILD="$GCC_OPTION $CFLAGS_FOR_BUILD" + CFLAGS_FOR_BUILD="$CFLAGS_FOR_BUILD $GCC_OPTION" fi fi ], [ AC_MSG_RESULT(no) can_add_to_cflags=no - CFLAGS="$CFLAGS_saved" ]) + CFLAGS="$CFLAGS_saved" fi # # Did we find a C++ compiler? @@ -1666,17 +1668,18 @@ if test "x$ac_supports_gcc_flags" = "xyes" ; then # AC_MSG_CHECKING(whether we can add $GCC_OPTION to CXXFLAGS) CXXFLAGS_saved="$CXXFLAGS" + CXXFLAGS="$WS_CHECKED_CXXFLAGS $CXXFLAGS" if expr "x$GCC_OPTION" : "x-W.*" >/dev/null then - CXXFLAGS="$ac_wireshark_unknown_warning_option_error $ac_wireshark_non_cxx_warning_option_error $GCC_OPTION $CXXFLAGS" + CXXFLAGS="$CXXFLAGS $ac_wireshark_unknown_warning_option_error $ac_wireshark_non_cxx_warning_option_error $GCC_OPTION" elif expr "x$GCC_OPTION" : "x-f.*" >/dev/null then - CXXFLAGS="-Werror $GCC_OPTION $CXXFLAGS" + CXXFLAGS="$CXXFLAGS -Werror $GCC_OPTION" elif expr "x$GCC_OPTION" : "x-m.*" >/dev/null then - CXXFLAGS="-Werror $GCC_OPTION $CXXFLAGS" + CXXFLAGS="$CXXFLAGS -Werror $GCC_OPTION" else - CXXFLAGS="$GCC_OPTION $CXXFLAGS" + CXXFLAGS="$CXXFLAGS $GCC_OPTION" fi AC_LANG_PUSH([C++]) AC_COMPILE_IFELSE( @@ -1706,11 +1709,10 @@ if test "x$ac_supports_gcc_flags" = "xyes" ; then # added them, by setting CXXFLAGS to the saved value plus # just the new option. # - CXXFLAGS="$GCC_OPTION $CXXFLAGS_saved" + WS_CHECKED_CXXFLAGS="$WS_CHECKED_CXXFLAGS $GCC_OPTION" ], [ AC_MSG_RESULT(yes) - CXXFLAGS="$CXXFLAGS_saved" ]) else # @@ -1718,14 +1720,14 @@ if test "x$ac_supports_gcc_flags" = "xyes" ; then # added them, by setting CXXFLAGS to the saved value plus # just the new option. # - CXXFLAGS="$GCC_OPTION $CXXFLAGS_saved" + WS_CHECKED_CXXFLAGS="$WS_CHECKED_CXXFLAGS $GCC_OPTION" fi ], [ AC_MSG_RESULT(no) can_add_to_cxxflags=no - CXXFLAGS="$CXXFLAGS_saved" ]) + CXXFLAGS="$CXXFLAGS_saved" AC_LANG_POP([C++]) fi if test "(" "$can_add_to_cflags" = "yes" -a "$can_add_to_cxxflags" = "no" ")" \ |