From: Timm Bäder <tbae...@redhat.com> Clang does not support this warning, so check for compiler support before using it.
Signed-off-by: Timm Bäder <tbae...@redhat.com> --- config/eu.am | 10 ++++++++-- configure.ac | 9 +++++++++ 2 files changed, 17 insertions(+), 2 deletions(-) diff --git a/config/eu.am b/config/eu.am index 02512570..2c3e4571 100644 --- a/config/eu.am +++ b/config/eu.am @@ -79,6 +79,12 @@ else TRAMPOLINES_WARNING= endif +if HAVE_NO_PACKED_NOT_ALIGNED_WARNING +NO_PACKED_NOT_ALIGNED_WARNING=-Wno-packed-not-aligned +else +NO_PACKED_NOT_ALIGNED_WARNING= +endif + AM_CFLAGS = -std=gnu99 -Wall -Wshadow -Wformat=2 \ -Wold-style-definition -Wstrict-prototypes $(TRAMPOLINES_WARNING) \ $(LOGICAL_OP_WARNING) $(DUPLICATED_COND_WARNING) \ @@ -86,7 +92,7 @@ AM_CFLAGS = -std=gnu99 -Wall -Wshadow -Wformat=2 \ $(if $($(*F)_no_Werror),,-Werror) \ $(if $($(*F)_no_Wunused),,-Wunused -Wextra) \ $(if $($(*F)_no_Wstack_usage),,$(STACK_USAGE_WARNING)) \ - $(if $($(*F)_no_Wpacked_not_aligned),-Wno-packed-not-aligned,) \ + $(if $($(*F)_no_Wpacked_not_aligned),$(NO_PACKED_NOT_ALIGNED_WARNING),) \ $($(*F)_CFLAGS) AM_CXXFLAGS = -std=c++11 -Wall -Wshadow \ @@ -96,7 +102,7 @@ AM_CXXFLAGS = -std=c++11 -Wall -Wshadow \ $(if $($(*F)_no_Werror),,-Werror) \ $(if $($(*F)_no_Wunused),,-Wunused -Wextra) \ $(if $($(*F)_no_Wstack_usage),,$(STACK_USAGE_WARNING)) \ - $(if $($(*F)_no_Wpacked_not_aligned),-Wno-packed-not-aligned,) \ + $(if $($(*F)_no_Wpacked_not_aligned),$(NO_PACKED_NOT_ALIGNED_WARNING),) \ $($(*F)_CXXFLAGS) COMPILE.os = $(filter-out -fprofile-arcs -ftest-coverage, $(COMPILE)) diff --git a/configure.ac b/configure.ac index 5f3321aa..aa8439e8 100644 --- a/configure.ac +++ b/configure.ac @@ -546,6 +546,15 @@ CFLAGS="$old_CFLAGS"]) AM_CONDITIONAL(HAVE_TRAMPOLINES_WARNING, [test "x$ac_cv_trampolines" != "xno"]) +AC_CACHE_CHECK([whether the compiler accepts -Wno-packed-not-aligned], ac_cv_no_packed_not_aligned, [dnl +old_CFLAGS="$CFLAGS" +CFLAGS="$CFLAGS -Wno-packed-not-aligned -Werror" +AC_COMPILE_IFELSE([AC_LANG_SOURCE([])], + ac_cv_no_packed_not_aligned=yes, ac_cv_no_packed_not_aligned=no) +CFLAGS="$old_CFLAGS"]) +AM_CONDITIONAL(HAVE_NO_PACKED_NOT_ALIGNED_WARNING, + [test "x$ac_cv_no_packed_not_aligned" != "xno"]) + saved_LIBS="$LIBS" AC_SEARCH_LIBS([argp_parse], [argp]) LIBS="$saved_LIBS" -- 2.26.2