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overwriting of CFLAGS #4

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Apr 20, 2011
Merged

overwriting of CFLAGS #4

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42 changes: 23 additions & 19 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -101,26 +101,30 @@ AC_SUBST(ESPRESSO_MPIEXEC)
##################################
#### COMPILER CHARACTERISTICS ####
##################################
# test for -O5
AC_MSG_CHECKING([whether the compiler accepts -O5])
saved_CFLAGS=$CFLAGS
CFLAGS="-O5 $CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],[
AC_MSG_RESULT(yes);try_add_flag_res=yes
],[
AC_MSG_RESULT(no); CFLAGS=$saved_CFLAGS; try_add_flag_res=no
])

##################################
# test for -Wall
AC_MSG_CHECKING([whether the compiler accepts -Wall])
saved_CFLAGS=$CFLAGS
CFLAGS="-Wall $CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],[
AC_MSG_RESULT(yes);try_add_flag_res=yes
],[
AC_MSG_RESULT(no); CFLAGS=$saved_CFLAGS; try_add_flag_res=no
])
#never overwrite users CFLAGS
if test ${CFLAGS+set} != set; then
# test for -O5
AC_MSG_CHECKING([whether the compiler accepts -O5])
saved_CFLAGS=$CFLAGS
CFLAGS="-O5 $CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],[
AC_MSG_RESULT(yes);try_add_flag_res=yes
],[
AC_MSG_RESULT(no); CFLAGS=$saved_CFLAGS; try_add_flag_res=no
])

##################################
# test for -Wall
AC_MSG_CHECKING([whether the compiler accepts -Wall])
saved_CFLAGS=$CFLAGS
CFLAGS="-Wall $CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],[
AC_MSG_RESULT(yes);try_add_flag_res=yes
],[
AC_MSG_RESULT(no); CFLAGS=$saved_CFLAGS; try_add_flag_res=no
])
fi

##################################
# test inlining
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