1 # Check for the extension used for executables on build platform. 2 # This is necessary for cross-compiling where the build platform 3 # may differ from the host platform. 4 AC_DEFUN([AC_BUILD_EXEEXT], 5 [ 6 AC_MSG_CHECKING([for executable suffix on build platform]) 7 AC_CACHE_VAL(ac_cv_build_exeext, 8 [if test "$CYGWIN" = yes || test "$MINGW32" = yes; then 9 ac_cv_build_exeext=.exe 10 else 11 ac_build_prefix=${build_alias}- 12 13 AC_CHECK_PROG(BUILD_CC, ${ac_build_prefix}gcc, ${ac_build_prefix}gcc) 14 if test -z "$BUILD_CC"; then 15 AC_CHECK_PROG(BUILD_CC, gcc, gcc) 16 if test -z "$BUILD_CC"; then 17 AC_CHECK_PROG(BUILD_CC, cc, cc, , , /usr/ucb/cc) 18 fi 19 fi 20 test -z "$BUILD_CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH]) 21 ac_build_link='${BUILD_CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&AS_MESSAGE_LOG_FD' 22 rm -f conftest* 23 echo 'int main () { return 0; }' > conftest.$ac_ext 24 ac_cv_build_exeext= 25 if AC_TRY_EVAL(ac_build_link); then 26 for file in conftest.*; do 27 case $file in 28 *.c | *.o | *.obj | *.dSYM) ;; 29 *) ac_cv_build_exeext=`echo $file | sed -e s/conftest//` ;; 30 esac 31 done 32 else 33 AC_MSG_ERROR([installation or configuration problem: compiler cannot create executables.]) 34 fi 35 rm -f conftest* 36 test x"${ac_cv_build_exeext}" = x && ac_cv_build_exeext=blank 37 fi]) 38 BUILD_EXEEXT="" 39 test x"${ac_cv_build_exeext}" != xblank && BUILD_EXEEXT=${ac_cv_build_exeext} 40 AC_MSG_RESULT(${ac_cv_build_exeext}) 41 ac_build_exeext=$BUILD_EXEEXT 42 AC_SUBST(BUILD_EXEEXT)]) 43
