https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62211
Bug ID: 62211 Summary: ./configure --with-float= and ARM Product: gcc Version: 4.9.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: web Assignee: unassigned at gcc dot gnu.org Reporter: dilyan.palauzov at aegee dot org At https://gcc.gnu.org/install/configure.html is written: Options specification --with-fpu=type --with-float=type These configure options provide default values for the -mfpu= option and for -mhard-float or -msoft-float. I want to configure for ARM. In the gcc manual, node 3.1 Option Summary under _ARM Options_ is mentioned the option -mfloat-abi= but -m(hard,sort)-float are not mentioned. In node 3.17.4 ARM Options is mentioned, that -mfloat-abi can be hard, soft or softfp. Does ./configure-ing gcc --with-float=X lead to defaulting the -mfloat-abi option later, when gcc is not called? In such a case, the documentation for configuring gcc shall mention, that --with-float=type on ARM has no impact on -msoft-float or -mhard-float, but on -mfloat-abi . The documentation of GCC does mention neither -mhard-float nor -msoft-float as general options nor as ARM-specific options, so I conclude that these are not permitted. However, the documentation of -mfpu= , where the ARM options are described, mentions: If '-msoft-float' is specified this specifies the format of floating-point values. So apparently, -msoft-float can be passed, when gcc produces ARM-code. Please clarify in the gcc manual if -msoft-float is the same as -mfloat-abi=soft, if -mhard-float is the same as -mfloat-abi=hard and if these, including -mfloag-abu=softfp are impacted by ./configure --with-float .