Split local helper macros into separate m4's

... which are then picked up via aclocal.

Signed-off-by: Alexey Neyman <stilor@att.net>

9 files changed, 195 insertions, 0 deletions

diff --git a/m4/README b/m4/README
new file mode 100644
index 0000000..a572d61
--- /dev/null
+++ b/m4/README
@@ -0,0 +1,7 @@
+These autoconf helper macros come from various sources:
+
+- ax_*.m4: autoconf-archive, version 2017.09.28 (copied)
+- pkg.m4: pkg-config, version 0.29.2 (run configure, then copy)
+- gettext.m4, iconv.m4, intlmacosx.m4, nls.m4: gettext 0.19.8
+- ctng_*.m4: obviously, implemented anew
+- po.m4: a local dummy stub for gettext's version
diff --git a/m4/ax_require_defined.m4 b/m4/ax_require_defined.m4
new file mode 100644
index 0000000..17c3eab
--- /dev/null
+++ b/m4/ax_require_defined.m4
@@ -0,0 +1,37 @@
+# ===========================================================================
+#    https://www.gnu.org/software/autoconf-archive/ax_require_defined.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_REQUIRE_DEFINED(MACRO)
+#
+# DESCRIPTION
+#
+#   AX_REQUIRE_DEFINED is a simple helper for making sure other macros have
+#   been defined and thus are available for use.  This avoids random issues
+#   where a macro isn't expanded.  Instead the configure script emits a
+#   non-fatal:
+#
+#     ./configure: line 1673: AX_CFLAGS_WARN_ALL: command not found
+#
+#   It's like AC_REQUIRE except it doesn't expand the required macro.
+#
+#   Here's an example:
+#
+#     AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
+#
+# LICENSE
+#
+#   Copyright (c) 2014 Mike Frysinger <vapier@gentoo.org>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 2
+
+AC_DEFUN([AX_REQUIRE_DEFINED], [dnl
+  m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])])
+])dnl AX_REQUIRE_DEFINED
diff --git a/m4/ctng_cpu_count.m4 b/m4/ctng_cpu_count.m4
new file mode 100644
index 0000000..4ea50d8
--- /dev/null
+++ b/m4/ctng_cpu_count.m4
@@ -0,0 +1,10 @@
+# Find out how to count CPUs
+AC_DEFUN([CTNG_CPU_COUNT],
+    [AC_CACHE_CHECK([whether to use getconf or sysctl to count CPUs],
+        [acx_cv_cpu_count],
+        [getconf _NPROCESSORS_ONLN >/dev/null 2>&1 && \
+             acx_cv_cpu_count="getconf _NPROCESSORS_ONLN"
+         sysctl -n hw.ncpu >/dev/null 2>&1 && \
+             acx_cv_cpu_count="sysctl -n hw.ncpu"])
+     AC_SUBST(CPU_COUNT, "$acx_cv_cpu_count")
+    ])
diff --git a/m4/ctng_gperf.m4 b/m4/ctng_gperf.m4
new file mode 100644
index 0000000..0ec1a0e
--- /dev/null
+++ b/m4/ctng_gperf.m4
@@ -0,0 +1,23 @@
+# Check for GNU perf location and the type it uses in the prototypes
+# FIXME: remove AC_SUBST after switching to using autoheader
+AC_DEFUN([CTNG_PROG_GPERF],
+    [AX_REQUIRE_DEFINED([CTNG_CHECK_TOOL_REQ])
+     CTNG_CHECK_TOOL_REQ([GPERF], [gperf], [gperf])
+     # Gperf 3.1 started generating functions with size_t rather than unsigned int
+     AC_MSG_CHECKING([for the type used in gperf declarations])
+     cat > conftest.gperf.c <<_ASEOF
+#include <string.h>"
+const char * in_word_set(const char *, GPERF_LEN_TYPE);
+_ASEOF
+     echo foo,bar | ${GPERF} -L ANSI-C >> conftest.gperf.c
+     AS_IF([${CC} -c -o /dev/null conftest.gperf.c -DGPERF_LEN_TYPE='size_t' >/dev/null 2>&1],
+            [AC_MSG_RESULT([size_t])
+             GPERF_LEN_TYPE='size_t'],
+        [${CC} -c -o /dev/null conftest.gperf.c -DGPERF_LEN_TYPE='unsigned int' >/dev/null 2>&1],
+            [AC_MSG_RESULT([unsigned int])
+             GPERF_LEN_TYPE='unsigned int'],
+        [AC_MSG_ERROR([unable to determine gperf len type])])
+     rm -f conftest.gperf.c
+     AC_DEFINE_UNQUOTED([GPERF_LEN_TYPE], $GPERF_LEN_TYPE, [String length type used by gperf])
+     AC_SUBST([GPERF_LEN_TYPE])
+])
diff --git a/m4/ctng_prog.m4 b/m4/ctng_prog.m4
new file mode 100644
index 0000000..ebbe333
--- /dev/null
+++ b/m4/ctng_prog.m4
@@ -0,0 +1,36 @@
+# Several convenience wrappers for checking the programs
+
+# Check for required tool
+AC_DEFUN([CTNG_CHECK_TOOL_REQ],
+    [AC_CHECK_TOOLS([$1], [$2])
+     AS_IF(
+        [test -z "$$1"],
+        [AC_MSG_ERROR([missing required tool: $2])])
+    ])
+
+# Check for required tool, set variable to full pathname
+AC_DEFUN([CTNG_PATH_TOOL_REQ],
+    [AC_ARG_VAR([$1], [Specify the full path to GNU $3])
+     CTNG_CHECK_TOOL_REQ([$1], [$2])
+     AS_CASE(
+        [$$1],
+        [/*],,
+        [?*],[AC_MSG_CHECKING([for absolute path to $$1])
+              $1=$(which $$1)
+              AC_MSG_RESULT([$$1])])])
+
+# Check for required program
+AC_DEFUN([CTNG_CHECK_PROGS_REQ],
+    [AC_CHECK_PROGS([$1], [$2])
+     AS_IF(
+        [test -z "$$1"],
+        [AC_MSG_ERROR([missing required tool: $2])])
+    ])
+
+# Check for path to required program
+AC_DEFUN([CTNG_PATH_PROGS_REQ],
+    [AC_PATH_PROGS([$1], [$2])
+     AS_IF(
+        [test -z "$$1"],
+        [AC_MSG_ERROR([missing required tool: $2])])
+   ])
diff --git a/m4/ctng_prog_stat.m4 b/m4/ctng_prog_stat.m4
new file mode 100644
index 0000000..f7de93e
--- /dev/null
+++ b/m4/ctng_prog_stat.m4
@@ -0,0 +1,18 @@
+# Check that stat(1) is present and determine the syntax for the format
+# string (BSD or GNU).
+AC_DEFUN([CTNG_PROG_STAT],
+    [AX_REQUIRE_DEFINED([CTNG_CHECK_PROGS_REQ])
+     CTNG_CHECK_PROGS_REQ([stat], [stat])
+     AC_CACHE_CHECK([whether stat takes GNU or BSD format],
+         [acx_cv_stat_flavor],
+         [touch conftest
+          chmod 642 conftest
+          attr_bsd=$(stat -f '%Lp' conftest 2>/dev/null)
+          attr_gnu=$(stat -c '%a' conftest 2>/dev/null)
+          rm -f conftest
+          AS_IF([test "$attr_bsd" = "642"],
+              [acx_cv_stat_flavor=BSD],
+              [test "$attr_gnu" = "642"],
+              [acx_cv_stat_flavor=GNU],
+              [AC_MSG_ERROR([cannot determine stat(1) format option])])])
+    ])
diff --git a/m4/ctng_set_kconfig_option.m4 b/m4/ctng_set_kconfig_option.m4
new file mode 100644
index 0000000..9fae320
--- /dev/null
+++ b/m4/ctng_set_kconfig_option.m4
@@ -0,0 +1,7 @@
+# Set the kconfig option.
+AC_DEFUN([CTNG_SET_KCONFIG_OPTION],
+    [AS_IF(
+         [test -n "$$1"],
+         [AC_SUBST([KCONFIG_$1], ["def_bool y"])],
+         [AC_SUBST([KCONFIG_$1], ["bool"])])
+    ])
diff --git a/m4/ctng_version_check.m4 b/m4/ctng_version_check.m4
new file mode 100644
index 0000000..472194b
--- /dev/null
+++ b/m4/ctng_version_check.m4
@@ -0,0 +1,47 @@
+# Check if a given program is available with a particular version.
+#   CTNG_PROG_VERSION(VAR, HELP, PROG, SRCH, VERSION_CHECK[, CONFIG_OPT])
+# Search for PROG under possible names of SRCH. Allow user overrides in variable
+# VAR; display HELP message. Try to find a version that satisfies VERSION_CHECK
+# regexp; if that is achieved, set CONFIG_OPT in the kconfig. Otherwise, settle
+# for any version found.
+# Sets acx_version_VAR_ok to ':' if the version met the criterion, or false otherwise.
+AC_DEFUN([CTNG_PROG_VERSION],
+    [AS_IF([test -z "$EGREP"],
+         [AC_MSG_ERROR([This macro can only be used after checking for EGREP])])
+     CTNG_WITH_DEPRECATED([$3], [$1])
+     AC_ARG_VAR([$1], [Specify the full path to $2])
+     acx_version_$1_ok=false
+     AC_CACHE_CHECK([for $3], [ac_cv_path_$1],
+         [AC_PATH_PROGS_FEATURE_CHECK([$1], [$4],
+              [[ver=$($ac_path_$1 --version 2>/dev/null| $EGREP $5)
+                test -z "$ac_cv_path_$1" && ac_cv_path_$1=$ac_path_$1
+                test -n "$ver" && ac_cv_path_$1="$ac_path_$1" ac_path_$1_found=: acx_version_$1_ok=:]])])
+     AS_IF([test -n "$1"],
+         [[ver=$($ac_path_$1 --version 2>/dev/null| $EGREP $5)
+           test -n "$ver" && acx_version_$1_ok=:]])
+     AC_MSG_CHECKING([for $2])
+     AS_IF([$acx_version_$1_ok],
+         [AC_MSG_RESULT([yes])],
+         [AC_MSG_RESULT([no])])
+     AC_SUBST([$1], [$ac_cv_path_$1])
+     AS_IF([test -n "$6"],
+         [AS_IF([$acx_version_$1_ok], [$6=y], [$6=])
+          CTNG_SET_KCONFIG_OPTION([$6])])
+    ])
+
+# Same as above, but make it a fatal error if the tool is not found at all
+# (i.e. "require any version, prefer version X or newer")
+AC_DEFUN([CTNG_PROG_VERSION_REQ_ANY],
+    [CTNG_PROG_VERSION([$1], [$2], [$3], [$4], [$5], [$6])
+     AS_IF([test -z "$$1"],
+         [AC_MSG_ERROR([Required tool not found: $3])])
+    ])
+
+# Same, but also require the version check to pass
+# (i.e. "require version X or newer")
+AC_DEFUN([CTNG_PROG_VERSION_REQ_STRICT],
+    [CTNG_PROG_VERSION([$1], [$2], [$3], [$4], [$5], [$6])
+     AS_IF([test -z "$$1" || ! $acx_version_$1_ok],
+         [AC_MSG_ERROR([Required tool not found: $2])])
+    ])
+
diff --git a/m4/ctng_with_deprecated.m4 b/m4/ctng_with_deprecated.m4
new file mode 100644
index 0000000..976bc3f
--- /dev/null
+++ b/m4/ctng_with_deprecated.m4
@@ -0,0 +1,10 @@
+# FIXME retire after 1.24
+#
+# CTNG_WITH_DEPRECATED(PROG, VAR)
+#   Declare a deprecated --with option: instead of --with-PROG=xxx, must use VAR=xxx
+AC_DEFUN([CTNG_WITH_DEPRECATED],
+    [AC_ARG_WITH([$1],
+                 [AS_HELP_STRING([--with-$1=PATH],
+                                 [Deprecated; use $2=PATH instead])],
+                 [AC_MSG_ERROR([--with-$1=$withval deprecated; use $2=$withval instead])])
+    ])