1 | dnl |
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2 | dnl $Id$ |
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3 | dnl |
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4 | dnl Check for target g++ |
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5 | dnl |
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6 | dnl 98/05/20 Ralf Corsepius (corsepiu@faw.uni-ulm.de) |
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7 | dnl Completely reworked |
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8 | |
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9 | AC_DEFUN(RTEMS_PROG_CXX, |
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10 | [ |
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11 | AC_BEFORE([$0], [AC_PROG_CXXCPP])dnl |
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12 | AC_BEFORE([$0], [AC_PROG_CXX])dnl |
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13 | AC_REQUIRE([RTEMS_TOOL_PREFIX])dnl |
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14 | |
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15 | dnl Only accept g++ and c++ |
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16 | dnl NOTE: This might be too restrictive for native compilation |
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17 | AC_PATH_PROGS(CXX_FOR_TARGET, "$program_prefix"g++ "$program_prefix"c++) |
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18 | test -z "$CXX_FOR_TARGET" \ |
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19 | && AC_MSG_ERROR([no acceptable c++ found in \$PATH]) |
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20 | |
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21 | dnl backup |
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22 | rtems_save_CXX=$CXX |
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23 | rtems_save_CXXFLAGS=$CXXFLAGS |
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24 | |
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25 | dnl temporarily set CXX |
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26 | CXX=$CXX_FOR_TARGET |
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27 | |
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28 | AC_PROG_CXX_WORKS |
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29 | AC_PROG_CXX_GNU |
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30 | |
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31 | if test $ac_cv_prog_gxx = yes; then |
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32 | GXX=yes |
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33 | dnl Check whether -g works, even if CXXFLAGS is set, in case the package |
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34 | dnl plays around with CXXFLAGS (such as to build both debugging and |
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35 | dnl normal versions of a library), tasteless as that idea is. |
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36 | ac_test_CXXFLAGS="${CXXFLAGS+set}" |
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37 | ac_save_CXXFLAGS="$CXXFLAGS" |
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38 | CXXFLAGS= |
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39 | AC_PROG_CXX_G |
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40 | if test "$ac_test_CXXFLAGS" = set; then |
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41 | CXXFLAGS="$ac_save_CXXFLAGS" |
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42 | elif test $ac_cv_prog_cxx_g = yes; then |
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43 | CXXFLAGS="-g -O2" |
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44 | else |
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45 | CXXFLAGS="-O2" |
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46 | fi |
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47 | else |
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48 | GXX= |
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49 | test "${CXXFLAGS+set}" = set || CXXFLAGS="-g" |
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50 | fi |
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51 | |
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52 | rtems_cv_prog_gxx=$ac_cv_prog_gxx |
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53 | rtems_cv_prog_cxx_g=$ac_cv_prog_cxx_g |
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54 | rtems_cv_prog_cxx_works=$ac_cv_prog_cxx_works |
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55 | rtems_cv_prog_cxx_cross=$ac_cv_prog_cxx_cross |
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56 | |
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57 | CXX=$rtems_save_CXX |
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58 | CXXFLAGS=$rtems_save_CXXFLAGS |
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59 | |
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60 | dnl restore initial values |
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61 | unset ac_cv_prog_gxx |
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62 | unset ac_cv_prog_cc_g |
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63 | unset ac_cv_prog_cxx_works |
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64 | unset ac_cv_prog_cxx_cross |
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65 | ]) |
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