diff options
Diffstat (limited to 'config')
| -rw-r--r-- | config/no-executables.m4 | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/config/no-executables.m4 b/config/no-executables.m4 new file mode 100644 index 0000000..ca26b71 --- /dev/null +++ b/config/no-executables.m4 @@ -0,0 +1,61 @@ +# GCC_NO_EXECUTABLES +# ----------------- +# FIXME: The GCC team has specific needs which the current Autoconf +# framework cannot solve elegantly. This macro implements a dirty +# hack until Autoconf is able to provide the services its users +# need. +# +# Several of the support libraries that are often built with GCC can't +# assume the tool-chain is already capable of linking a program: the +# compiler often expects to be able to link with some of such +# libraries. +# +# In several of these libraries, workarounds have been introduced to +# avoid the AC_PROG_CC_WORKS test, that would just abort their +# configuration. The introduction of AC_EXEEXT, enabled either by +# libtool or by CVS autoconf, have just made matters worse. +# +# Unlike the previous AC_NO_EXECUTABLES, this test does not +# disable link tests at autoconf time, but at configure time. +# This allows AC_NO_EXECUTABLES to be invoked conditionally. +AC_DEFUN_ONCE([GCC_NO_EXECUTABLES], +[m4_divert_push([KILL]) + +AC_BEFORE([$0], [_AC_COMPILER_EXEEXT]) +AC_BEFORE([$0], [AC_LINK_IFELSE]) + +m4_define([_AC_COMPILER_EXEEXT], +AC_LANG_CONFTEST([AC_LANG_PROGRAM()]) +# FIXME: Cleanup? +AS_IF([AC_TRY_EVAL(ac_link)], [gcc_no_link=no], [gcc_no_link=yes]) +if test x$gcc_no_link = xyes; then + # Setting cross_compile will disable run tests; it will + # also disable AC_CHECK_FILE but that's generally + # correct if we can't link. + cross_compiling=yes + EXEEXT= +else + m4_defn([_AC_COMPILER_EXEEXT])dnl +fi +) + +m4_define([AC_LINK_IFELSE], +if test x$gcc_no_link = xyes; then + AC_MSG_ERROR([Link tests are not allowed after [[$0]].]) +fi +m4_defn([AC_LINK_IFELSE])) + +dnl This is a shame. We have to provide a default for some link tests, +dnl similar to the default for run tests. +m4_define([AC_FUNC_MMAP], +if test x$gcc_no_link = xyes; then + if test "x${ac_cv_func_mmap_fixed_mapped+set}" != xset; then + ac_cv_func_mmap_fixed_mapped=no + fi +fi +if test "x${ac_cv_func_mmap_fixed_mapped+set}" != xset; then + m4_defn([AC_FUNC_MMAP]) +fi) + +m4_divert_pop()dnl +])# GCC_NO_EXECUTABLES |