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authorJunio C Hamano <gitster@pobox.com>2018-05-08 06:59:21 (GMT)
committerJunio C Hamano <gitster@pobox.com>2018-05-08 06:59:21 (GMT)
commite998e7a1880ce3939aa6f7ad4244ad319c1655d1 (patch)
treef08c5acfe18500ae3b667843b1ce4ee21504ca00 /detect-compiler
parent174774cd519846616edc475fcbc98237409ffc21 (diff)
parent26d2e4fb227c1415011a136fa9bb881ee338118a (diff)
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Merge branch 'nd/warn-more-for-devs'
The build procedure "make DEVELOPER=YesPlease" learned to enable a bit more warning options depending on the compiler used to help developers more. There also is "make DEVOPTS=tokens" knob available now, for those who want to help fixing warnings we usually ignore, for example. * nd/warn-more-for-devs: Makefile: add a DEVOPTS to get all of -Wextra Makefile: add a DEVOPTS to suppress -Werror under DEVELOPER Makefile: detect compiler and enable more warnings in DEVELOPER=1 connect.c: mark die_initial_contact() NORETURN
Diffstat (limited to 'detect-compiler')
-rwxr-xr-xdetect-compiler53
1 files changed, 53 insertions, 0 deletions
diff --git a/detect-compiler b/detect-compiler
new file mode 100755
index 0000000..70b7544
--- /dev/null
+++ b/detect-compiler
@@ -0,0 +1,53 @@
+#!/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() {
+ $CC -v 2>&1 | grep ' version '
+}
+
+get_family() {
+ get_version_line | sed 's/^\(.*\) version [0-9][^ ]* .*/\1/'
+}
+
+get_version() {
+ get_version_line | sed 's/^.* version \([0-9][^ ]*\) .*/\1/'
+}
+
+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)
+ print_flags clang
+ ;;
+"FreeBSD clang")
+ print_flags clang
+ ;;
+"Apple LLVM")
+ print_flags clang
+ ;;
+*)
+ : unknown compiler family
+ ;;
+esac