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File name : prog-cc-c-o.m4

Content :## -*- Autoconf -*- # Copyright (C) 1999-2018 Free Software Foundation, Inc. # # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # _AM_PROG_CC_C_O # --------------- # Like AC_PROG_CC_C_O, but changed for automake. We rewrite AC_PROG_CC # to automatically call this. AC_DEFUN([_AM_PROG_CC_C_O], [AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl AC_REQUIRE_AUX_FILE([compile])dnl AC_LANG_PUSH([C])dnl AC_CACHE_CHECK( [whether $CC understands -c and -o together], [am_cv_prog_cc_c_o], [AC_LANG_CONFTEST([AC_LANG_PROGRAM([])]) # Make sure it works both with $CC and with simple cc. # Following AC_PROG_CC_C_O, we do the test twice because some # compilers refuse to overwrite an existing .o file with -o, # though they will create one. am_cv_prog_cc_c_o=yes for am_i in 1 2; do if AM_RUN_LOG([$CC -c conftest.$ac_ext -o conftest2.$ac_objext]) \ && test -f conftest2.$ac_objext; then : OK else am_cv_prog_cc_c_o=no break fi done rm -f core conftest* unset am_i]) if test "$am_cv_prog_cc_c_o" != yes; then # Losing compiler, so override with the script. # FIXME: It is wrong to rewrite CC. # But if we don't then we get into trouble of one sort or another. # A longer-term fix would be to have automake use am__CC in this case, # and then we could set am__CC="\$(top_srcdir)/compile \$(CC)" CC="$am_aux_dir/compile $CC" fi AC_LANG_POP([C])]) # For backward compatibility. AC_DEFUN_ONCE([AM_PROG_CC_C_O], [AC_REQUIRE([AC_PROG_CC])])

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