Merge branch 'maint'

[platform/upstream/automake.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index ad34d15..b3dfe1f 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -268,6 +268,9 @@ exit 77" >&AS_MESSAGE_LOG_FD 2>&1; test $? -eq 77; }
 # We require that the shell can correctly trap EXIT when 'set -e' is in
 # effect (OSF1/Tru64 sh failed to do so, see commit v1.10b-52-g9fe8259).
 #
+# We want to able to define shell aliases with the same name of shell
+# builtins.
+#
 # We also prefer shells that, when 'set -x' is in effect, do not also
 # redirect traces upon stderr redirections.  For example,
 #  $ set -x; echo x 2>file
@@ -300,35 +303,58 @@ AC_DEFUN([_AM_CHECK_CANDIDATE_SHELL],
       [], [am_score=1; break])
 
     _AM_CHECK_SHELL_FEATURE([$1],
-      [supports \${var@%:@glob}],
-      [v=a/b/c; test ${v@%:@*/} = b/c],
-      [], [am_score=1; break])
-
-    _AM_CHECK_SHELL_FEATURE([$1],
-      [supports \${var@%:@@%:@glob}],
-      [v=a/b/c; test ${v@%:@@%:@*/} = c],
+      [supports \${@%:@var}],
+      [zero='' one='x' twelve=' foobar baz!' \
+        && test ${@%:@zero} -eq 0 \
+        && test ${@%:@one} -eq 1 \
+        && test ${@%:@twelve} -eq 12],
       [], [am_score=1; break])
 
     _AM_CHECK_SHELL_FEATURE([$1],
-      [supports \${var%glob}],
-      [v=a.b.c; test ${v%.*} = a.b],
+      [supports \${var@%:@glob} and \${var%glob}],
+      [v=a/b/c \
+        && test ${v@%:@*/} = b/c \
+        && test ${v@%:@@%:@*/} = c \
+        && test ${v%/*} = a/b \
+        && test ${v%%/*} = a],
       [], [am_score=1; break])
 
     _AM_CHECK_SHELL_FEATURE([$1],
-      [supports \${var%%glob}],
-      [v=a.b.c; test ${v%%.*} = a],
+      [preserves exit traps with "set -e"],
+      [set -e; trap 'exit $?' 0; (exit 77); exit 77],
       [], [am_score=1; break])
 
     _AM_CHECK_SHELL_FEATURE([$1],
-      ["set -e" preserves exit traps],
-      [set -e; trap 'exit $?' 0; (exit 77); exit 77],
+      [can define exit traps in a shell function],
+      [fail=0 && foo() { trap 'fail=1' 0; } && foo && test $fail = 0],
       [], [am_score=1; break])
 
     _AM_CHECK_SHELL_FEATURE([$1],
-      ["set -x" corrupts stderr],
+      [corrupts stderr with "set -x"],
       [(set -x; P=1 true 2>&3) 3>&1 2>/dev/null | grep P=1],
       [am_score=9], [])
 
+    echo 'return 34' > conftest-return.sh
+    echo 'ok=no' >> conftest-return.sh
+    _AM_CHECK_SHELL_FEATURE([$1],
+      [can return early from "dot-sourced" files],
+      [ok=yes; . ./conftest-return.sh; test $? -eq 34 && test $ok = yes],
+      [rm -f conftest-return.sh],
+      [rm -f conftest-return.sh; am_score=1; break])
+
+    echo 'alias false=echo' > conftest-alias.sh
+    echo 'false && test "$(false 97)" = 97' >> conftest-alias.sh
+    _AM_CHECK_SHELL_FEATURE([$1],
+      [supports alias named like shell builtins],
+      [. ./conftest-alias.sh],
+      [rm -f conftest-alias.sh],
+      [rm -f conftest-alias.sh; am_score=1; break])
+
+    _AM_CHECK_SHELL_FEATURE([$1],
+      [supports "test -e"],
+      [test -e config.log && test -e . && test ! -e nonesuch],
+      [], [am_score=1; break])
+
     break
   done])
 
@@ -384,10 +410,6 @@ fi
 AC_ARG_VAR([AM_TEST_RUNNER_SHELL],
            [a sturdy POSIX shell for our testsuite])
 
-## ---------------------- ##
-##  Create output files.  ##
-## ---------------------- ##
-
 
 ###########################################################################
 
@@ -447,12 +469,23 @@ _AM_COMPILER_CAN_FAIL(dnl
 
 AS_IF([test x"$GCC" = x"yes"], [am_CC_is_GNU=yes], [am_CC_is_GNU=no])
 
+# On case-insensitive file systems (seen e.g. on Cygwin and Mac OS X)
+# we must avoid looking for 'CC', because that would be the same as
+# 'cc', and could cause $CXX to point to the C compiler, instead of
+# to a C++ compiler as expected.  See automake bugs #11893 and #10766.
+if test -f /bIn/rMdIr || test -f /uSr/bIn/rMdIr; then
+  # Case-insensitive file system, don't look for CC.
+  am_CC=
+else
+  am_CC=CC
+fi
+
 # The list of C++ compilers here has been copied, pasted and edited
 # from 'lib/autoconf/c.m4:AC_PROG_CXX' in the Autoconf distribution.
 # Keep it in sync, or better again, find out a way to avoid this code
 # duplication.
 _AM_COMPILER_CAN_FAIL([AC_PROG_CXX(dnl
-  [aCC CC FCC KCC RCC xlC_r xlC c++ cxx cc++ gpp g++])],
+  [aCC $am_CC FCC KCC RCC xlC_r xlC c++ cxx cc++ gpp g++])],
   [CXX=false; _AM_SKIP_COMP_TESTS([C++])])
 
 AS_IF([test x"$GXX" = x"yes"], [am_CXX_is_GNU=yes], [am_CXX_is_GNU=no])
@@ -559,6 +592,10 @@ AC_SUBST([EXEEXT])
 
 ###########################################################################
 
+## ---------------------- ##
+##  Create output files.  ##
+## ---------------------- ##
+
 AC_CONFIG_FILES([Makefile])
 
 AC_CONFIG_LINKS([GNUmakefile:GNUmakefile])