Merge branch 'ps/build-tweaks'

Tweak the build infrastructure by moving tools around.

* ps/build-tweaks:
  meson: precompile "git-compat-util.h"
  meson: compile compatibility sources separately
  git-compat-util.h: move warning infra to prepare for PCHs
  builds: move build scripts into "tools/"
  contrib: move "update-unicode.sh" script into "tools/"
  contrib: move "coverage-diff.sh" script into "tools/"
  contrib: move "coccinelle/" directory into "tools/"
  Introduce new "tools/" directory

1 files changed, 58 insertions, 0 deletions

diff --git a/tools/detect-compiler b/tools/detect-compiler
new file mode 100755
index 0000000000..124ebdd4c9
--- /dev/null
+++ b/tools/detect-compiler
@@ -0,0 +1,58 @@
+#!/bin/sh
+#
+# Probe the compiler for vintage, version, etc. This is used for setting
+# optional make knobs under the DEVELOPER knob.
+
+CC="$*"
+
+# we get something like (this is at least true for gcc and clang)
+#
+# FreeBSD clang version 3.4.1 (tags/RELEASE...)
+get_version_line() {
+	LANG=C LC_ALL=C $CC -v 2>&1 | sed -n '/ version /{p;q;}'
+}
+
+get_family() {
+	get_version_line | sed 's/^\(.*\) version [0-9].*/\1/'
+}
+
+get_version() {
+	# A string that begins with a digit up to the next SP
+	ver=$(get_version_line | sed 's/^.* version \([0-9][^ ]*\).*/\1/')
+
+	# There are known -variant suffixes that do not affect the
+	# meaning of the main version number.  Strip them.
+	ver=${ver%-win32}
+	ver=${ver%-posix}
+
+	echo "$ver"
+}
+
+print_flags() {
+	family=$1
+	version=$(get_version | cut -f 1 -d .)
+
+	# Print a feature flag not only for the current version, but also
+	# for any prior versions we encompass. This avoids needing to do
+	# numeric comparisons in make, which are awkward.
+	while test "$version" -gt 0
+	do
+		echo $family$version
+		version=$((version - 1))
+	done
+}
+
+case "$(get_family)" in
+gcc)
+	print_flags gcc
+	;;
+clang | *" clang")
+	print_flags clang
+	;;
+"Apple LLVM")
+	print_flags clang
+	;;
+*)
+	: unknown compiler family
+	;;
+esac