[PATCH v2] 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>
---
 Changes from v1 [1]:

   - install target depends on strip when INSTALL_STRIP is defined
     (sugested by Đoàn)

 [1]: https://lore.kernel.org/git/YSDW3nsG2iWPGakF@danh.dev/T/#t

 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..43c47f5560 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.
 #
@@ -3004,6 +3006,9 @@ profile-install: profile
 profile-fast-install: profile-fast
 	$(MAKE) install
 
+ifdef INSTALL_STRIP
+install: strip
+endif
 install: all
 	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(bindir_SQ)'
 	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'

base-commit: 225bc32a989d7a22fa6addafd4ce7dcd04675dbf
-- 
2.25.1