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author | Ben Cheng <bccheng@google.com> | 2013-03-28 11:14:20 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2013-03-28 12:40:33 -0700 |
commit | af0c51ac87ab2a87caa03fa108f0d164987a2764 (patch) | |
tree | 4b8b470f7c5b69642fdab8d0aa1fbc148d02196b /gcc-4.8/config/no-executables.m4 | |
parent | d87cae247d39ebf4f5a6bf25c932a14d2fdb9384 (diff) | |
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[GCC 4.8] Initial check-in of GCC 4.8.0
Change-Id: I0719d8a6d0f69b367a6ab6f10eb75622dbf12771
Diffstat (limited to 'gcc-4.8/config/no-executables.m4')
-rw-r--r-- | gcc-4.8/config/no-executables.m4 | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/gcc-4.8/config/no-executables.m4 b/gcc-4.8/config/no-executables.m4 new file mode 100644 index 000000000..90616245e --- /dev/null +++ b/gcc-4.8/config/no-executables.m4 @@ -0,0 +1,69 @@ +# 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}" != xno; then + m4_defn([AC_FUNC_MMAP]) +fi) + +m4_divert_pop()dnl +])# GCC_NO_EXECUTABLES + +# Use the strongest available test out of AC_TRY_COMPILE and AC_TRY_LINK. +AC_DEFUN([GCC_TRY_COMPILE_OR_LINK], +[if test x$gcc_no_link = xyes; then + AC_TRY_COMPILE([$1], [$2], [$3], [$4]) +else + AC_TRY_LINK([$1], [$2], [$3], [$4]) +fi]) |