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 Adaptation of autoconf-2.12's AC_PROG_CXX to rtems |
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7 | dnl |
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8 | dnl 98/02/10 Ralf Corsepius (corsepiu@faw.uni-ulm.de) |
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9 | dnl |
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10 | |
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11 | AC_DEFUN(RTEMS_PROG_CXX, |
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12 | [ |
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13 | AC_BEFORE([$0], [AC_PROG_CXXCPP])dnl |
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14 | AC_BEFORE([$0], [AC_PROG_CXX])dnl |
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15 | AC_CHECK_PROGS(CXX, $CCC c++ g++ gcc CC cxx cc++, gcc) |
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16 | |
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17 | RTEMS_PROG_CXX_WORKS |
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18 | AC_PROG_CXX_GNU |
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19 | |
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20 | if test $ac_cv_prog_gxx = yes; then |
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21 | GXX=yes |
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22 | dnl Check whether -g works, even if CXXFLAGS is set, in case the package |
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23 | dnl plays around with CXXFLAGS (such as to build both debugging and |
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24 | dnl normal versions of a library), tasteless as that idea is. |
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25 | ac_test_CXXFLAGS="${CXXFLAGS+set}" |
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26 | ac_save_CXXFLAGS="$CXXFLAGS" |
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27 | CXXFLAGS= |
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28 | AC_PROG_CXX_G |
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29 | if test "$ac_test_CXXFLAGS" = set; then |
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30 | CXXFLAGS="$ac_save_CXXFLAGS" |
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31 | elif test $ac_cv_prog_cxx_g = yes; then |
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32 | CXXFLAGS="-g -O2" |
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33 | else |
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34 | CXXFLAGS="-O2" |
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35 | fi |
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36 | else |
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37 | GXX= |
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38 | test "${CXXFLAGS+set}" = set || CXXFLAGS="-g" |
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39 | fi |
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40 | CXX_FOR_TARGET=$CXX |
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41 | |
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42 | dnl restore initial values |
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43 | unset CXX |
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44 | unset ac_cv_prog_gxx |
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45 | ]) |
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46 | |
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47 | |
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48 | dnl Almost identical to AC_PROG_CXX_WORKS |
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49 | dnl Additional handling of malloc |
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50 | dnl NOTE: using newlib with a native compiler is cross-compiling, indeed. |
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51 | AC_DEFUN(RTEMS_PROG_CXX_WORKS, |
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52 | [AC_MSG_CHECKING([whether the target C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works]) |
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53 | AC_LANG_SAVE |
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54 | AC_LANG_CPLUSPLUS |
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55 | |
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56 | dnl this fails if rtems uses newlib, because rtems has its own malloc which |
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57 | dnl is not available at bootstrap |
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58 | AC_TRY_COMPILER( |
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59 | [main(){return(0);}], |
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60 | rtems_cv_prog_cxx_works, rtems_cv_prog_cxx_cross) |
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61 | if test "$rtems_cv_prog_cxx_works" = "no"; then |
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62 | dnl now retry with our own version of malloc |
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63 | AC_TRY_COMPILER( |
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64 | [ main(){return(0);}], |
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65 | rtems_cv_prog_cxx_works, rtems_cv_prog_cxx_cross) |
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66 | fi |
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67 | AC_LANG_RESTORE |
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68 | AC_MSG_RESULT($rtems_cv_prog_cxx_works) |
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69 | if test $rtems_cv_prog_cxx_works = no; then |
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70 | AC_MSG_ERROR([installation or configuration problem: target C++ compiler cannot create executables.]) |
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71 | fi |
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72 | AC_MSG_CHECKING([whether the target C++ compiler ($CXX $CXXFLAGS $LDFLAGS) is a cross-compiler]) |
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73 | AC_MSG_RESULT($rtems_cv_prog_cxx_cross) |
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74 | ]) |
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