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authorLibravatar Nguyễn Thái Ngọc Duy <pclouds@gmail.com>2018-04-14 19:19:44 +0000
committerLibravatar Junio C Hamano <gitster@pobox.com>2018-04-16 13:54:53 +0900
commit1da1580e4c2d482070363edc7b4f8b42874c312a (patch)
tree28400e2b4abd899817506cc548aed03dfeee5534 /detect-compiler
parentconnect.c: mark die_initial_contact() NORETURN (diff)
downloadtgif-1da1580e4c2d482070363edc7b4f8b42874c312a.tar.xz
Makefile: detect compiler and enable more warnings in DEVELOPER=1
The set of extra warnings we enable when DEVELOPER has to be conservative because we can't assume any compiler version the developer may use. Detect the compiler version so we know when it's safe to enable -Wextra and maybe more. These warning settings are mostly from my custom config.mak a long time ago when I tried to enable as many warnings as possible that can still build without showing warnings. Some of those warnings are probably worth fixing instead of just suppressing in future. Helped-by: Jeff King <peff@peff.net> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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 0000000000..70b754481c
--- /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