Don't pass -fno-loop-optimize to gcc<3.0, even on powerpc, since they don't understand it

[simgrid.git] / acmacro / compiler-flags.m4

diff --git a/acmacro/compiler-flags.m4 b/acmacro/compiler-flags.m4
index 0c577c2..951c596 100644 (file)
--- a/acmacro/compiler-flags.m4
+++ b/acmacro/compiler-flags.m4
@@ -6,11 +6,11 @@ dnl For now, only sets extra flags on GCC
 
 AC_DEFUN([SG_COMPILE_FLAGS],[
   AC_ARG_ENABLE(compile-warnings,
-    AS_HELP_STRING([--enable-compile-warnings], [use compiler warnings (default=no)]),
+    AS_HELP_STRING([--enable-compile-warnings], [use compiler warnings (default=no, unless in maintainer mode)]),
     enable_compile_warnings=$withval,enable_compile_warnings=no)
 
   AC_ARG_ENABLE(compile-optimizations,
-    AS_HELP_STRING([--enable-compile-optimizations], [use compiler optimizations (default=yes, unless if CFLAGS is explicitly set)]),
+    AS_HELP_STRING([--disable-compile-optimizations], [use compiler optimizations (default=yes, unless if CFLAGS is explicitly set)]),
     enable_compile_optimizations=$enableval,enable_compile_optimizations=auto)
 
   if test "x$cflags_set" != "xyes" ; then 
@@ -66,11 +66,16 @@ AC_DEFUN([SG_COMPILE_FLAGS],[
         esac
         optCFLAGS="$optCFLAGS -finline-functions -ffast-math -funroll-loops -fno-strict-aliasing"
       
-        if test "x$target_cpu" = "xpowerpc" ; then
+        GCC_VER=`gcc --version | head -n 1 | sed 's/^[^0-9]*\([^ ]*\).*$/\1/'`
+        GCC_VER_MAJ=`echo $GCC_VER | sed 's/^\(.\).*$/\1/'`
+        if test "x$target_cpu" = "xpowerpc" && test "x$GCC_VER_MAJ" != "x2" ; then
           # avoid gcc bug #12828, which is fixed in 3.4.0, but this version
           # isn't propagated enough to desserve an extra check
+          
+          # Note that the flag didn't exist before gcc 3.0
           optCFLAGS="$optCFLAGS -fno-loop-optimize"
         fi
+        dnl A C_MSG_WARN(GCC_VER_MAJ=$GCC_VER_MAJ)
     fi
     AC_MSG_RESULT($optCFLAGS)
     # Take it only if CFLAGS not explicitly set. Unless the flag was explicitly given