[PATCH] make: add INSTALL_STRIP variable

[Bagas Sanjaya <bagasdotme@gmail.com>]

In some environments (most notably embedded systems and small production
servers), it is often desirable to have stripped Git binaries due to
tight disk space constraint.

Until now stripped Git can be built wih `make strip install`. Add
INSTALL_STRIP make variable so that they can install stripped Git
binaries with `make INSTALL_STRIP=yes install`.

Also document stripping and using INSTALL_STRIP in INSTALL.

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
---
 Junio suggested me to have INSTALL_STRIP make variable [1] when
 reviewing the install-strip target patch.

 [1]:
https://lore.kernel.org/git/xmqq1r6p1ark.fsf@gitster.g/T/#mc3b8017448bdafedf9250ba407f5de767c20ad67

 INSTALL  | 8 ++++++++
 Makefile | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/INSTALL b/INSTALL
index 66389ce059..98e541ee4d 100644
--- a/INSTALL
+++ b/INSTALL
@@ -58,6 +58,14 @@ suite has to be run using only a single CPU.  In addition, the profile
 feedback build stage currently generates a lot of additional compiler
 warnings.
 
+You can also strip debug info from built binaries by:
+
+	$ make strip
+
+or for stripping and installing together:
+
+	$ make INSTALL_STRIP=yes install
+
 Issues of note:
 
  - Ancient versions of GNU Interactive Tools (pre-4.9.2) installed a
diff --git a/Makefile b/Makefile
index 9573190f1d..e486f3ab75 100644
--- a/Makefile
+++ b/Makefile
@@ -8,6 +8,8 @@ all::
 # Define SANE_TOOL_PATH to a colon-separated list of paths to prepend
 # to PATH if your tools in /usr/bin are broken.
 #
+# Define INSTALL_STRIP if you want to install with stripped binaries.
+#
 # Define SOCKLEN_T to a suitable type (such as 'size_t') if your
 # system headers do not define a socklen_t type.
 #
@@ -3005,6 +3007,9 @@ profile-fast-install: profile-fast
 	$(MAKE) install
 
 install: all
+ifdef INSTALL_STRIP
+	$(MAKE) strip
+endif
 	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(bindir_SQ)'
 	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
 	$(INSTALL) $(ALL_PROGRAMS) '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'

base-commit: 225bc32a989d7a22fa6addafd4ce7dcd04675dbf
-- 
2.25.1