[PATCH] This PR enables a successful git build on z/OS.

["Haritha via GitGitGadget" <gitgitgadget@gmail.com>]

From: Haritha D <harithamma.d@ibm.com>

Since the z/OS linker does not support searching dynamic libraries,
and the current setting of CC_LD_DYNPATH results in a directory
to be supplied to the link step with no option as the suffix,
it causes a linker error because the z/OS LD linker
does not accept directories as input.
Therefore, we workaround this by adding the -L option.
And, Introduced z/OS (OS/390) as a platform in config.mak.uname

Signed-off-by: Haritha D <harithamma.d@ibm.com>
---
    This PR enables a successful git build on z/OS.
    
    Since the z/OS linker does not support searching dynamic libraries, and
    the current setting of CC_LD_DYNPATH results in a directory to be
    supplied to the link step with no option as the suffix, it causes a
    linker error because the z/OS LD linker does not accept directories as
    input. Therefore, we workaround this by adding the -L option. And,
    Introduced z/OS (OS/390) as a platform in config.mak.uname

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1663%2FHarithaIBM%2Fzos-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1663/HarithaIBM/zos-v1
Pull-Request: https://github.com/git/git/pull/1663

 config.mak.uname | 12 ++++++++++++
 configure.ac     |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/config.mak.uname b/config.mak.uname
index dacc95172dc..c8006f854e5 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -638,6 +638,18 @@ ifeq ($(uname_S),NONSTOP_KERNEL)
 	SANE_TOOL_PATH = /usr/coreutils/bin:/usr/local/bin
 	SHELL_PATH = /usr/coreutils/bin/bash
 endif
+ifeq ($(uname_S),OS/390)
+        NO_SYS_POLL_H = YesPlease
+        NO_STRCASESTR = YesPlease
+        NO_REGEX = YesPlease
+        NO_MMAP = YesPlease
+        NO_NSEC = YesPlease
+        NO_STRLCPY = YesPlease
+        NO_MEMMEM = YesPlease
+        NO_GECOS_IN_PWENT = YesPlease
+        HAVE_STRINGS_H = YesPlease
+        NEEDS_MODE_TRANSLATION = YesPlease
+endif
 ifeq ($(uname_S),MINGW)
 	ifeq ($(shell expr "$(uname_R)" : '1\.'),2)
 		$(error "Building with MSys is no longer supported")
diff --git a/configure.ac b/configure.ac
index d1a96da14eb..64569a80d53 100644
--- a/configure.ac
+++ b/configure.ac
@@ -463,6 +463,9 @@ else
             CC_LD_DYNPATH=-Wl,+b,
           else
              CC_LD_DYNPATH=
+	     if test "$(uname -s)" = "OS/390"; then
+		     CC_LD_DYNPATH=-L
+	     fi
              AC_MSG_WARN([linker does not support runtime path to dynamic libraries])
           fi
       fi

base-commit: bc7ee2e5e16f0d1e710ef8fab3db59ab11f2bbe7
-- 
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