configure.ac: Verify that the Loongson MMI code can link The Loongson MMI code modifies -march and as a result it breaks linking when the rest of the code is built with a different -match/-mtune. This patch fixes the problem by trying to link the code instead of just compiling it. This patch is already committed upstream. Signed-off-by: Markos Chandras From d77d75cc6e5de14d027d22b70389a4d0c71048b9 Mon Sep 17 00:00:00 2001 From: Markos Chandras Date: Wed, 15 May 2013 16:51:20 +0000 Subject: Use AC_LINK_IFELSE to check if the Loongson MMI code can link The Loongson code is compiled with -march=loongson2f to enable the MMI instructions, but binutils refuses to link object code compiled with different -march settings, leading to link failures later in the compile. This avoids that problem by checking if we can link code compiled for Loongson. Reviewed-by: Matt Turner Signed-off-by: Markos Chandras --- diff --git a/configure.ac b/configure.ac index c43a0d2..221179f 100644 --- a/configure.ac +++ b/configure.ac @@ -279,7 +279,7 @@ AC_MSG_CHECKING(whether to use Loongson MMI assembler) xserver_save_CFLAGS=$CFLAGS CFLAGS=" $LS_CFLAGS $CFLAGS -I$srcdir" -AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +AC_LINK_IFELSE([AC_LANG_SOURCE([[ #ifndef __mips_loongson_vector_rev #error "Loongson Multimedia Instructions are only available on Loongson" #endif -- cgit v0.9.0.2-2-gbebe