diff options
Diffstat (limited to 'config/acx.m4')
| -rw-r--r-- | config/acx.m4 | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/config/acx.m4 b/config/acx.m4 index 96b7c8a5c..ab7f98a21 100644 --- a/config/acx.m4 +++ b/config/acx.m4 @@ -155,3 +155,38 @@ AC_DEFUN([AC_PROG_CPP_WERROR], [AC_REQUIRE([AC_PROG_CPP])dnl m4_define([AC_CHECK_HEADER],m4_defn([_AC_CHECK_HEADER_OLD])) ac_c_preproc_warn_flag=yes])# AC_PROG_CPP_WERROR + +# Test for GNAT. +# We require the gnatbind program, and a compiler driver that +# understands Ada. We use the user's CC setting, already found. +# +# Sets the shell variable have_gnat to yes or no as appropriate, and +# substitutes GNATBIND. +AC_DEFUN([ACX_PROG_GNAT], +[AC_REQUIRE([AC_CHECK_TOOL_PREFIX]) +AC_REQUIRE([AC_PROG_CC]) +AC_CHECK_TOOL(GNATBIND, gnatbind, no) +AC_CACHE_CHECK([whether compiler driver understands Ada], + acx_cv_cc_gcc_supports_ada, +[cat >conftest.adb <<EOF +procedure conftest is begin null; end conftest; +EOF +acx_cv_cc_gcc_supports_ada=no +# There is a bug in old released versions of GCC which causes the +# driver to exit successfully when the appropriate language module +# has not been installed. This is fixed in 2.95.4, 3.0.2, and 3.1. +# Therefore we must check for the error message as well as an +# unsuccessful exit. +errors=`(${CC} -c conftest.adb) 2>&1 || echo failure` +if test x"$errors" = x; then + acx_cv_cc_gcc_supports_ada=yes + break +fi +rm -f conftest.*]) + +if test x$GNATBIND != xno && test x$acx_cv_gcc_supports_ada != xno; then + have_gnat=yes +else + have_gnat=no +fi +]) |