Check that the compiler supports -mv8 before adding it to the command

line on sun sparc. Issue #1458.

I haven't recieved confirmation this resolves the issue, but I don't see
how it can do much harm.

svn path=/trunk/vorbis/; revision=15746

diff --git a/configure.ac b/configure.ac
index 855f416..cf722fb 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -162,9 +162,18 @@ else
                CFLAGS="-O20 -Wall -Wextra -ffast-math -D_REENTRANT -fsigned-char"
                PROFILE="-pg -g -O20 -ffast-math -D_REENTRANT -fsigned-char";;
        sparc-sun-*)
-               DEBUG="-g -Wall -Wextra -D__NO_MATH_INLINES -fsigned-char -mv8"
-               CFLAGS="-O20 -Wall -Wextra -ffast-math -D__NO_MATH_INLINES -fsigned-char -mv8"
-               PROFILE="-pg -g -O20 -D__NO_MATH_INLINES -fsigned-char -mv8" ;;
+               sparc_cpu=""
+               AC_MSG_CHECKING([if gcc supports -mv8])
+               old_cflags="$CFLAGS"
+               CFLAGS="$CFLAGS -mv8"
+               AC_TRY_COMPILE(, [return 0;], [
+                       AC_MSG_RESULT([yes])
+                       sparc_cpu="-mv8"
+               ])
+               CFLAGS="$old_cflags"
+               DEBUG="-g -Wall -Wextra -D__NO_MATH_INLINES -fsigned-char $sparc_cpu"
+               CFLAGS="-O20 -Wall -Wextra -ffast-math -D__NO_MATH_INLINES -fsigned-char $sparc_cpu"
+               PROFILE="-pg -g -O20 -D__NO_MATH_INLINES -fsigned-char $sparc_cpu" ;;
        *-*-darwin*)
                DEBUG="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -O0 -fsigned-char"
                CFLAGS="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -O4 -ffast-math -fsigned-char"