dnl -*- shell-script -*- dnl dnl Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana dnl University Research and Technology dnl Corporation. All rights reserved. dnl Copyright (c) 2004-2006 The University of Tennessee and The University dnl of Tennessee Research Foundation. All rights dnl reserved. dnl Copyright (c) 2004-2008 High Performance Computing Center Stuttgart, dnl University of Stuttgart. All rights reserved. dnl Copyright (c) 2004-2006 The Regents of the University of California. dnl All rights reserved. dnl Copyright (c) 2007-2009 Sun Microsystems, Inc. All rights reserved. dnl Copyright (c) 2008-2013 Cisco Systems, Inc. All rights reserved. dnl Copyright (c) 2012 Los Alamos National Security, LLC. All rights dnl reserved. dnl $COPYRIGHT$ dnl dnl Additional copyrights may follow dnl dnl $HEADER$ dnl # OPAL_SETUP_CC() # --------------- # Do everything required to setup the C compiler. Safe to AC_REQUIRE # this macro. AC_DEFUN([OPAL_SETUP_CC],[ # AM_PROG_CC_C_O AC_REQUIREs AC_PROG_CC, so we have to be a little # careful about ordering here, and AC_REQUIRE these things so that # they get stamped out in the right order. AC_REQUIRE([_OPAL_START_SETUP_CC]) AC_REQUIRE([_OPAL_PROG_CC]) AC_REQUIRE([AM_PROG_CC_C_O]) # AC_PROG_CC_C99 changes CC (instead of CFLAGS) so save CC (without c99 # flags) for use in our wrappers. WRAPPER_CC="$CC" AC_SUBST([WRAPPER_CC]) # From Open MPI 1.7 on we require a C99 compiant compiler AC_PROG_CC_C99 # The result of AC_PROG_CC_C99 is stored in ac_cv_prog_cc_c99 if test "x$ac_cv_prog_cc_c99" = xno ; then AC_MSG_WARN([Open MPI requires a C99 compiler]) AC_MSG_ERROR([Aborting.]) fi OPAL_C_COMPILER_VENDOR([opal_c_vendor]) # Check for standard headers, needed here because needed before # the types checks. AC_HEADER_STDC # GNU C and autotools are inconsistent about whether this is # defined so let's make it true everywhere for now... However, IBM # XL compilers on PPC Linux behave really badly when compiled with # _GNU_SOURCE defined, so don't define it in that situation. # # Don't use AC_GNU_SOURCE because it requires that no compiler # tests are done before setting it, and we need to at least do # enough tests to figure out if we're using XL or not. AS_IF([test "$opal_cv_c_compiler_vendor" != "ibm"], [AH_VERBATIM([_GNU_SOURCE], [/* Enable GNU extensions on systems that have them. */ #ifndef _GNU_SOURCE # undef _GNU_SOURCE #endif]) AC_DEFINE([_GNU_SOURCE])]) # Do we want code coverage if test "$WANT_COVERAGE" = "1"; then if test "$opal_c_vendor" = "gnu" ; then # For compilers > gcc-4.x, use --coverage for # compiling and linking to circumvent trouble with # libgcov. CFLAGS_orig="$CFLAGS" LDFLAGS_orig="$LDFLAGS" CFLAGS="$CFLAGS_orig --coverage" LDFLAGS="$LDFLAGS_orig --coverage" OPAL_COVERAGE_FLAGS= AC_CACHE_CHECK([if $CC supports --coverage], [opal_cv_cc_coverage], [AC_TRY_COMPILE([], [], [opal_cv_cc_coverage="yes"], [opal_cv_cc_coverage="no"])]) if test "$opal_cv_cc_coverage" = "yes" ; then OPAL_COVERAGE_FLAGS="--coverage" CLEANFILES="*.gcno ${CLEANFILES}" CONFIG_CLEAN_FILES="*.gcda *.gcov ${CONFIG_CLEAN_FILES}" else OPAL_COVERAGE_FLAGS="-ftest-coverage -fprofile-arcs" CLEANFILES="*.bb *.bbg ${CLEANFILES}" CONFIG_CLEAN_FILES="*.da *.*.gcov ${CONFIG_CLEAN_FILES}" fi CFLAGS="$CFLAGS_orig $OPAL_COVERAGE_FLAGS" LDFLAGS="$LDFLAGS_orig $OPAL_COVERAGE_FLAGS" OPAL_WRAPPER_FLAGS_ADD([CFLAGS], [$OPAL_COVERAGE_FLAGS]) OPAL_WRAPPER_FLAGS_ADD([LDFLAGS], [$OPAL_COVERAGE_FLAGS]) OPAL_FLAGS_UNIQ(CFLAGS) OPAL_FLAGS_UNIQ(LDFLAGS) AC_MSG_WARN([$OPAL_COVERAGE_FLAGS has been added to CFLAGS (--enable-coverage)]) WANT_DEBUG=1 else AC_MSG_WARN([Code coverage functionality is currently available only with GCC]) AC_MSG_ERROR([Configure: Cannot continue]) fi fi # Do we want debugging? if test "$WANT_DEBUG" = "1" -a "$enable_debug_symbols" != "no" ; then if test "$opal_c_vendor" = "gnu"; then CFLAGS="$CFLAGS -g" # keep the -g3 for when it will become a standard option. else CFLAGS="$CFLAGS -g" fi OPAL_FLAGS_UNIQ(CFLAGS) AC_MSG_WARN([-g has been added to CFLAGS (--enable-debug)]) fi # These flags are generally gcc-specific; even the # gcc-impersonating compilers won't accept them. OPAL_CFLAGS_BEFORE_PICKY="$CFLAGS" if test "$WANT_PICKY_COMPILER" = 1 -a "$opal_c_vendor" = "gnu" ; then add="-Wall -Wundef -Wno-long-long -Wsign-compare" add="$add -Wmissing-prototypes -Wstrict-prototypes" add="$add -Wcomment -pedantic" # see if -Wno-long-double works... CFLAGS_orig="$CFLAGS" # CFLAGS="$CFLAGS -Wno-long-double" # Starting with GCC-4.4, the compiler complains about not # knowing -Wno-long-double, only if -Wstrict-prototypes is set, too. # # Actually, this is not real fix, as GCC will pass on any -Wno- flag, # have fun with the warning: -Wno-britney CFLAGS="$CFLAGS $add -Wno-long-double -Wstrict-prototypes" AC_CACHE_CHECK([if $CC supports -Wno-long-double], [opal_cv_cc_wno_long_double], [AC_TRY_COMPILE([], [], [ dnl So -Wno-long-double did not produce any errors... dnl We will try to extract a warning regarding dnl unrecognized or ignored options AC_TRY_COMPILE([], [long double test;], [ opal_cv_cc_wno_long_double="yes" if test -s conftest.err ; then dnl Yes, it should be "ignor", in order to catch ignoring and ignore for i in unknown invalid ignor unrecognized ; do $GREP -iq $i conftest.err if test "$?" = "0" ; then opal_cv_cc_wno_long_double="no" break; fi done fi ], [opal_cv_cc_wno_long_double="no"])], [opal_cv_cc_wno_long_double="no"]) ]) CFLAGS="$CFLAGS_orig" if test "$opal_cv_cc_wno_long_double" = "yes" ; then add="$add -Wno-long-double" fi add="$add -Werror-implicit-function-declaration " CFLAGS="$CFLAGS $add" OPAL_FLAGS_UNIQ(CFLAGS) AC_MSG_WARN([$add has been added to CFLAGS (--enable-picky)]) unset add fi # See if this version of gcc allows -finline-functions and/or # -fno-strict-aliasing. Even check the gcc-impersonating compilers. if test "$GCC" = "yes"; then CFLAGS_orig="$CFLAGS" CFLAGS="$CFLAGS_orig -finline-functions" add= AC_CACHE_CHECK([if $CC supports -finline-functions], [opal_cv_cc_finline_functions], [AC_TRY_COMPILE([], [], [opal_cv_cc_finline_functions="yes"], [opal_cv_cc_finline_functions="no"])]) if test "$opal_cv_cc_finline_functions" = "yes" ; then add=" -finline-functions" fi CFLAGS="$CFLAGS_orig$add" CFLAGS_orig="$CFLAGS" CFLAGS="$CFLAGS_orig -fno-strict-aliasing" add= AC_CACHE_CHECK([if $CC supports -fno-strict-aliasing], [opal_cv_cc_fno_strict_aliasing], [AC_TRY_COMPILE([], [], [opal_cv_cc_fno_strict_aliasing="yes"], [opal_cv_cc_fno_strict_aliasing="no"])]) if test "$opal_cv_cc_fno_strict_aliasing" = "yes" ; then add=" -fno-strict-aliasing" fi CFLAGS="$CFLAGS_orig$add" OPAL_FLAGS_UNIQ(CFLAGS) AC_MSG_WARN([$add has been added to CFLAGS]) unset add fi # Try to enable restrict keyword RESTRICT_CFLAGS= case "$opal_c_vendor" in intel) RESTRICT_CFLAGS="-restrict" ;; sgi) RESTRICT_CFLAGS="-LANG:restrict=ON" ;; esac if test ! -z "$RESTRICT_CFLAGS" ; then CFLAGS_orig="$CFLAGS" CFLAGS="$CFLAGS_orig $RESTRICT_CFLAGS" add= AC_CACHE_CHECK([if $CC supports $RESTRICT_CFLAGS], [opal_cv_cc_restrict_cflags], [AC_TRY_COMPILE([], [], [opal_cv_cc_restrict_cflags="yes"], [opal_cv_cc_restrict_cflags="no"])]) if test "$opal_cv_cc_restrict_cflags" = "yes" ; then add=" $RESTRICT_CFLAGS" fi CFLAGS="${CFLAGS_orig}${add}" OPAL_FLAGS_UNIQ([CFLAGS]) if test "$add" != "" ; then AC_MSG_WARN([$add has been added to CFLAGS]) fi unset add fi # see if the C compiler supports __builtin_expect AC_CACHE_CHECK([if $CC supports __builtin_expect], [opal_cv_cc_supports___builtin_expect], [AC_TRY_LINK([], [void *ptr = (void*) 0; if (__builtin_expect (ptr != (void*) 0, 1)) return 0;], [opal_cv_cc_supports___builtin_expect="yes"], [opal_cv_cc_supports___builtin_expect="no"])]) if test "$opal_cv_cc_supports___builtin_expect" = "yes" ; then have_cc_builtin_expect=1 else have_cc_builtin_expect=0 fi AC_DEFINE_UNQUOTED([OPAL_C_HAVE_BUILTIN_EXPECT], [$have_cc_builtin_expect], [Whether C compiler supports __builtin_expect]) # see if the C compiler supports __builtin_prefetch AC_CACHE_CHECK([if $CC supports __builtin_prefetch], [opal_cv_cc_supports___builtin_prefetch], [AC_TRY_LINK([], [int ptr; __builtin_prefetch(&ptr,0,0);], [opal_cv_cc_supports___builtin_prefetch="yes"], [opal_cv_cc_supports___builtin_prefetch="no"])]) if test "$opal_cv_cc_supports___builtin_prefetch" = "yes" ; then have_cc_builtin_prefetch=1 else have_cc_builtin_prefetch=0 fi AC_DEFINE_UNQUOTED([OPAL_C_HAVE_BUILTIN_PREFETCH], [$have_cc_builtin_prefetch], [Whether C compiler supports __builtin_prefetch]) # see if the C compiler supports __builtin_clz AC_CACHE_CHECK([if $CC supports __builtin_clz], [opal_cv_cc_supports___builtin_clz], [AC_TRY_LINK([], [int value = 0xffff; /* we know we have 16 bits set */ if ((8*sizeof(int)-16) != __builtin_clz(value)) return 0;], [opal_cv_cc_supports___builtin_clz="yes"], [opal_cv_cc_supports___builtin_clz="no"])]) if test "$opal_cv_cc_supports___builtin_clz" = "yes" ; then have_cc_builtin_clz=1 else have_cc_builtin_clz=0 fi AC_DEFINE_UNQUOTED([OPAL_C_HAVE_BUILTIN_CLZ], [$have_cc_builtin_clz], [Whether C compiler supports __builtin_clz]) # Preload the optflags for the case where the user didn't specify # any. If we're using GNU compilers, use -O3 (since it GNU # doesn't require all compilation units to be compiled with the # same level of optimization -- selecting a high level of # optimization is not prohibitive). If we're using anything else, # be conservative and just use -O. # # Note: gcc-impersonating compilers accept -O3 if test "$WANT_DEBUG" = "1"; then OPTFLAGS= else if test "$GCC" = yes; then OPTFLAGS="-O3" else OPTFLAGS="-O" fi fi OPAL_ENSURE_CONTAINS_OPTFLAGS("$OPAL_CFLAGS_BEFORE_PICKY") OPAL_CFLAGS_BEFORE_PICKY="$co_result" AC_MSG_CHECKING([for C optimization flags]) OPAL_ENSURE_CONTAINS_OPTFLAGS(["$CFLAGS"]) AC_MSG_RESULT([$co_result]) CFLAGS="$co_result" ]) AC_DEFUN([_OPAL_START_SETUP_CC],[ opal_show_subtitle "C compiler and preprocessor" # $%@#!@#% AIX!! This has to be called before anything invokes the C # compiler. dnl AC_AIX ]) AC_DEFUN([_OPAL_PROG_CC],[ # # Check for the compiler # OPAL_VAR_SCOPE_PUSH([opal_cflags_save dummy opal_cc_arvgv0]) opal_cflags_save="$CFLAGS" AC_PROG_CC BASECC="`basename $CC`" CFLAGS="$opal_cflags_save" AC_DEFINE_UNQUOTED(OPAL_CC, "$CC", [OMPI underlying C compiler]) set dummy $CC opal_cc_argv0=[$]2 OPAL_WHICH([$opal_cc_argv0], [OPAL_CC_ABSOLUTE]) AC_SUBST(OPAL_CC_ABSOLUTE) OPAL_VAR_SCOPE_POP ])