diff options
Diffstat (limited to 'common/m4/as-gcc-inline-assembly.m4')
| -rw-r--r-- | common/m4/as-gcc-inline-assembly.m4 | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/common/m4/as-gcc-inline-assembly.m4 b/common/m4/as-gcc-inline-assembly.m4 new file mode 100644 index 0000000..af32104 --- /dev/null +++ b/common/m4/as-gcc-inline-assembly.m4 @@ -0,0 +1,52 @@ +dnl as-gcc-inline-assembly.m4 0.1.0 + +dnl autostars m4 macro for detection of gcc inline assembly + +dnl David Schleef <ds@schleef.org> + +dnl $Id$ + +dnl AS_COMPILER_FLAG(ACTION-IF-ACCEPTED, [ACTION-IF-NOT-ACCEPTED]) +dnl Tries to compile with the given CFLAGS. +dnl Runs ACTION-IF-ACCEPTED if the compiler can compile with the flags, +dnl and ACTION-IF-NOT-ACCEPTED otherwise. + +AC_DEFUN([AS_GCC_INLINE_ASSEMBLY], +[ + AC_MSG_CHECKING([if compiler supports gcc-style inline assembly]) + + AC_TRY_COMPILE([], [ +#ifdef __GNUC_MINOR__ +#if (__GNUC__ * 1000 + __GNUC_MINOR__) < 3004 +#error GCC before 3.4 has critical bugs compiling inline assembly +#endif +#endif +__asm__ (""::) ], [flag_ok=yes], [flag_ok=no]) + + if test "X$flag_ok" = Xyes ; then + $1 + true + else + $2 + true + fi + AC_MSG_RESULT([$flag_ok]) +]) + + +AC_DEFUN([AS_GCC_ASM_POWERPC_FPU], +[ + AC_MSG_CHECKING([if compiler supports FPU instructions on PowerPC]) + + AC_TRY_COMPILE([], [__asm__ ("fadd 0,0,0"::) ], [flag_ok=yes], [flag_ok=no]) + + if test "X$flag_ok" = Xyes ; then + $1 + true + else + $2 + true + fi + AC_MSG_RESULT([$flag_ok]) +]) + |