git-merge: show usage if run without arguments

diff --git a/configure.ac b/configure.ac
index 0f93f6fe2948f338167d3c019b0fba014eeba508..cff5722eb9927ec652e3db731fc033508bc44ef2 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -75,7 +75,6 @@ GIT_ARG_SET_PATH(shell)
 # Define PERL_PATH to provide path to Perl.
 GIT_ARG_SET_PATH(perl)
 #
-# Define NO_PYTHON if you want to lose all benefits of the recursive merge.
 # Define PYTHON_PATH to provide path to Python.
 AC_ARG_WITH(python,[AS_HELP_STRING([--with-python=PATH], [provide PATH to python])
 AS_HELP_STRING([--without-python], [don't use python scripts])],
@@ -96,18 +95,10 @@ AC_SUBST(PYTHON_PATH)
 AC_MSG_NOTICE([CHECKS for programs])
 #
 AC_PROG_CC([cc gcc])
-if test -n "$GCC"; then
-       PIC_FLAG="-fPIC"
-else
-       AC_CHECK_DECL(__SUNPRO_C, [CFLAGS="$CFLAGS -xO3"; PIC_FLAG="-KPIC"])
-fi
-AC_SUBST(PIC_FLAG)
-
 #AC_PROG_INSTALL               # needs install-sh or install.sh in sources
 AC_CHECK_TOOL(AR, ar, :)
 AC_CHECK_PROGS(TAR, [gtar tar])
 #
-# Define NO_PYTHON if you want to lose all benefits of the recursive merge.
 # Define PYTHON_PATH to provide path to Python.
 if test -z "$NO_PYTHON"; then
        if test -z "$PYTHON_PATH"; then
@@ -150,10 +141,15 @@ AC_CHECK_LIB([expat], [XML_ParserCreate],
 AC_SUBST(NO_EXPAT)
 #
 # Define NEEDS_LIBICONV if linking with libc is not enough (Darwin).
+# Define NO_ICONV if neither libc nor libiconv support iconv.
 AC_CHECK_LIB([c], [iconv],
-[NEEDS_LIBICONV=],
-[NEEDS_LIBICONV=YesPlease])
+       [NEEDS_LIBICONV=],
+       AC_CHECK_LIB([iconv], [iconv],
+               [NEEDS_LIBICONV=YesPlease],
+               [NO_ICONV=YesPlease]))
 AC_SUBST(NEEDS_LIBICONV)
+AC_SUBST(NO_ICONV)
+test -n "$NEEDS_LIBICONV" && LIBS="$LIBS -liconv"
 #
 # Define NEEDS_SOCKET if linking with libc is not enough (SunOS,
 # Patrick Mauritz).
@@ -211,8 +207,8 @@ AC_SUBST(NO_IPV6)
 # do not support the 'size specifiers' introduced by C99, namely ll, hh,
 # j, z, t. (representing long long int, char, intmax_t, size_t, ptrdiff_t).
 # some C compilers supported these specifiers prior to C99 as an extension.
-AC_CACHE_CHECK(whether formatted IO functions support C99 size specifiers,
- ac_cv_c_c99_format,
+AC_CACHE_CHECK([whether formatted IO functions support C99 size specifiers],
+ [ac_cv_c_c99_format],
 [# Actually git uses only %z (%zu) in alloc.c, and %t (%td) in mktag.c
 AC_RUN_IFELSE(
        [AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
@@ -267,6 +263,16 @@ AC_SUBST(NO_SETENV)
 # Enable it on Windows.  By default, symrefs are still used.
 #
 # Define WITH_OWN_SUBPROCESS_PY if you want to use with python 2.3.
+AC_CACHE_CHECK([for subprocess.py],
+ [ac_cv_python_has_subprocess_py],
+[if $PYTHON_PATH -c 'import subprocess' 2>/dev/null; then
+       ac_cv_python_has_subprocess_py=yes
+else
+       ac_cv_python_has_subprocess_py=no
+fi])
+if test $ac_cv_python_has_subprocess_py != yes; then
+       GIT_CONF_APPEND_LINE([WITH_OWN_SUBPROCESS_PY=YesPlease])
+fi
 #
 # Define NO_ACCURATE_DIFF if your diff program at least sometimes misses
 # a missing newline at the end of the file.
@@ -336,6 +342,16 @@ GIT_PARSE_WITH(expat))
 # library directories by defining CFLAGS and LDFLAGS appropriately.
 #
 # Define NO_MMAP if you want to avoid mmap.
+#
+# Define NO_ICONV if your libc does not properly support iconv.
+AC_ARG_WITH(iconv,
+AS_HELP_STRING([--without-iconv],
+[if your architecture doesn't properly support iconv])
+AS_HELP_STRING([--with-iconv=PATH],
+[PATH is prefix for libiconv library and headers])
+AS_HELP_STRING([],
+[used only if you need linking with libiconv]),
+GIT_PARSE_WITH(iconv))
 
 ## --enable-FEATURE[=ARG] and --disable-FEATURE
 #