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Re: [PATCH] Make copy of <bits/std_abs.h> from GCC 7 [BZ #21573]
On 06/13/2017 01:54 PM, H.J. Lu wrote:
> - echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}"
> + echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "\,$1:,{s/:\$//;p}"
> }
> CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
> + # Also make a copy of <bits/std_abs.h> from GCC 7 to prevent it from
> + # including /usr/include/stdlib.h.
> + CXX_CSTDLIB_HEADER="$CXX_CSTDLIB_HEADER $(find_cxx_header bits/std_abs.h)"
I think the attached patch is needed to suppress the error message if
the header does not exist. (Regenerated configure file not shown in the
patch.)
Thanks,
Florian
configure: Suppress expected compiler error message
2017-06-13 Florian Weimer <fweimer@redhat.com>
* configure.ac (find_cxx_header): Suppress compiler error message.
diff --git a/configure.ac b/configure.ac
index d74bd44..3f486d6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1187,7 +1187,8 @@ AC_SUBST(CXX_SYSINCLUDES)
# copy of those headers in Makerules.
if test -n "$CXX"; then
find_cxx_header () {
- echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "\,$1:,{s/:\$//;p}"
+ echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
+ | sed -n "\,$1:,{s/:\$//;p}"
}
CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
CXX_CMATH_HEADER="$(find_cxx_header cmath)"