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Detect working ifunc before enabling dynamic sized delete support 

Particularly, on arm-linux and x86-64-debian-kfreebsd compilation fails
due to lack of support for ifunc. So it is necessary to test at
configure time whether ifunc is supported.
This commit is contained in:
Aliaksey Kandratsenka 2016-02-06 16:19:54 -08:00
parent a788f354a0
commit 08e034ad59
1 changed files with 17 additions and 2 deletions
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19
configure.ac
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@ -334,7 +334,20 @@ AC_ARG_ENABLE([dynamic-sized-delete-support],
[AS_HELP_STRING([--disable-dynamic-sized-delete-support],
[don't try to build run-time switch for sized delete operator])],
[enable_dyn_sized_delete="$enableval"],
[enable_dyn_sized_delete=yes])
[enable_dyn_sized_delete=default])
AS_IF([test "x$enable_dyn_sized_delete" = xdefault],
[AC_CACHE_CHECK(
[if the compiler supports ifunc attributes for target],
[perftools_cv_ifunc_result],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([
void *resolve_foo() {return 0;}
void foo() __attribute__((ifunc("resolve_foo")));
],[foo();])],
[perftools_cv_ifunc_result=yes],
[perftools_cv_ifunc_result=no])])]
[enable_dyn_sized_delete=$perftools_cv_ifunc_result])
AS_IF([test "x$enable_dyn_sized_delete" = xyes],
[AC_DEFINE([ENABLE_DYNAMIC_SIZED_DELETE], 1,
@ -348,7 +361,9 @@ AC_ARG_ENABLE([sized-delete],
AS_IF([test "x$enable_sized_delete" = xyes],
[AC_DEFINE([ENABLE_SIZED_DELETE], 1, [Build sized deletion operators])
AC_MSG_NOTICE([Will build sized deallocation operators])],
[AC_MSG_NOTICE([Will not build sized deallocation operators])])
[AS_IF([test "x$enable_dyn_sized_delete" = xyes],
[AC_MSG_NOTICE([Will build dynamically detected sized deallocation operators])],
[AC_MSG_NOTICE([Will not build sized deallocation operators])])])
AS_IF([test "x$enable_sized_delete" = xyes -o "x$enable_dyn_sized_delete" = xyes],
[AC_CACHE_CHECK([if C++ compiler supports -fsized-deallocation],