http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51450
Bug #: 51450
Summary: configure's test for -fno-rtti -fno-exceptions broken
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
AssignedTo: [email protected]
ReportedBy: [email protected]
I have noticed that configure decides that my build GCC does not support
-fno-rtti -fno-exceptions when building a new GCC.
I traced this down to a problem in libtool.m4 where _LT_COMPILER_NO_RTTI uses
_LT_COMPILER_OPTION to check whether these 2 options are supported.
The latter compiles & links $lt_simple_compile_test_code which contains:
lt_simple_compile_test_code="int some_variable = 0;"
The link phase fails because there is no main(), and then configure decides
-fno-rtti -fno-exceptions are not supported.
I am not sure about how to fix this:
- change _LT_COMPILER_OPTION to use $lt_simple_link_test_code instead?
- use a modified _LT_LINKER_OPTION (given that the options tests belong to
CFLAGS rather than LDFLAGS)?
- other?
Maybe this bug should be reported elsewhere?
