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Ævar Arnfjörð Bjarmason 07564773c2 compat: auto-detect if zlib has uncompress2()

We have a copy of uncompress2() implementation in compat/ so that we
can build with an older version of zlib that lack the function, and
the build procedure selects if it is used via the NO_UNCOMPRESS2
$(MAKE) variable.  This is yet another "annoying" knob the porters
need to tweak on platforms that are not common enough to have the
default set in the config.mak.uname file.

Attempt to instead ask the system header <zlib.h> to decide if we
need the compatibility implementation.  This is a deviation from the
way we have been handling the "compatiblity" features so far, and if
it can be done cleanly enough, it could work as a model for features
that need compatibility definition we discover in the future.  With
that goal in mind, avoid expedient but ugly hacks, like shoving the
code that is conditionally compiled into an unrelated .c file, which
may not work in future cases---instead, take an approach that uses a
file that is independently compiled and stands on its own.

Compile and link compat/zlib-uncompress2.c file unconditionally, but
conditionally hide the implementation behind #if/#endif when zlib
version is 1.2.9 or newer, and unconditionally archive the resulting
object file in the libgit.a to be picked up by the linker.

There are a few things to note in the shape of the code base after
this change:

 - We no longer use NO_UNCOMPRESS2 knob; if the system header
   <zlib.h> claims a version that is more cent than the library
   actually is, this would break, but it is easy to add it back when
   we find such a system.

 - The object file compat/zlib-uncompress2.o is always compiled and
   archived in libgit.a, just like a few other compat/ object files
   already are.

 - The inclusion of <zlib.h> is done in <git-compat-util.h>; we used
   to do so from <cache.h> which includes <git-compat-util.h> as the
   first thing it does, so from the *.c codes, there is no practical
   change.

 - Until objects in libgit.a that is already used gains a reference
   to the function, the reftable code will be the only one that
   wants it, so libgit.a on the linker command line needs to appear
   once more at the end to satisify the mutual dependency.

 - Beat found a trick used by OpenSSL to avoid making the
   conditionally-compiled object truly empty (apparently because
   they had to deal with compilers that do not want to see an
   effectively empty input file).  Our compat/zlib-uncompress2.c
   file borrows the same trick for portabilty.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Helped-by: Beat Bolli <dev+git@drbeat.li>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2022-01-26 09:05:55 -08:00

794 lines

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 # Platform specific Makefile tweaks based on uname detection
 # Define NO_SAFESEH if you need MSVC/Visual Studio to ignore the lack of
 # Microsoft's Safe Exception Handling in libraries (such as zlib).
 # Typically required for VS2013+/32-bit compilation on Vista+ versions.
 uname_S := $(shell sh -c 'uname -s 2>/dev/null || echo not')
 uname_M := $(shell sh -c 'uname -m 2>/dev/null || echo not')
 uname_O := $(shell sh -c 'uname -o 2>/dev/null || echo not')
 uname_R := $(shell sh -c 'uname -r 2>/dev/null || echo not')
 uname_P := $(shell sh -c 'uname -p 2>/dev/null || echo not')
 uname_V := $(shell sh -c 'uname -v 2>/dev/null || echo not')
 ifneq ($(findstring MINGW,$(uname_S)),)
 	uname_S := MINGW
 endif
 ifdef MSVC
 	# avoid the MingW and Cygwin configuration sections
 	uname_S := Windows
 	uname_O := Windows
 	# Generate and include makefile variables that point to the
 	# currently installed set of MSVC command line tools.
 compat/vcbuild/MSVC-DEFS-GEN: compat/vcbuild/find_vs_env.bat
 	@"$<" | tr '\\' / >"$@"
 include compat/vcbuild/MSVC-DEFS-GEN
 	# See if vcpkg and the vcpkg-build versions of the third-party
 	# libraries that we use are installed.  We include the result
 	# to get $(vcpkg_*) variables defined for the Makefile.
 ifeq (,$(SKIP_VCPKG))
 compat/vcbuild/VCPKG-DEFS: compat/vcbuild/vcpkg_install.bat
 	@"$<"
 include compat/vcbuild/VCPKG-DEFS
 endif
 endif
 # We choose to avoid "if .. else if .. else .. endif endif"
 # because maintaining the nesting to match is a pain.  If
 # we had "elif" things would have been much nicer...
 ifeq ($(uname_S),OSF1)
 	# Need this for u_short definitions et al
 	BASIC_CFLAGS += -D_OSF_SOURCE
 	SOCKLEN_T = int
 	NO_STRTOULL = YesPlease
 	NO_NSEC = YesPlease
 endif
 ifeq ($(uname_S),Linux)
 	HAVE_ALLOCA_H = YesPlease
 	NO_STRLCPY = YesPlease
 	HAVE_PATHS_H = YesPlease
 	LIBC_CONTAINS_LIBINTL = YesPlease
 	HAVE_DEV_TTY = YesPlease
 	HAVE_CLOCK_GETTIME = YesPlease
 	HAVE_CLOCK_MONOTONIC = YesPlease
 	# -lrt is needed for clock_gettime on glibc <= 2.16
 	NEEDS_LIBRT = YesPlease
 	HAVE_GETDELIM = YesPlease
 	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 	BASIC_CFLAGS += -DHAVE_SYSINFO
 	PROCFS_EXECUTABLE_PATH = /proc/self/exe
 	HAVE_PLATFORM_PROCINFO = YesPlease
 	COMPAT_OBJS += compat/linux/procinfo.o
 	# centos7/rhel7 provides gcc 4.8.5 and zlib 1.2.7.
 	ifneq ($(findstring .el7.,$(uname_R)),)
 		BASIC_CFLAGS += -std=c99
 	endif
 endif
 ifeq ($(uname_S),GNU/kFreeBSD)
 	HAVE_ALLOCA_H = YesPlease
 	NO_STRLCPY = YesPlease
 	HAVE_PATHS_H = YesPlease
 	DIR_HAS_BSD_GROUP_SEMANTICS = YesPlease
 	LIBC_CONTAINS_LIBINTL = YesPlease
 	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 endif
 ifeq ($(uname_S),UnixWare)
 	CC = cc
 	NEEDS_SOCKET = YesPlease
 	NEEDS_NSL = YesPlease
 	NEEDS_SSL_WITH_CRYPTO = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	SHELL_PATH = /usr/local/bin/bash
 	NO_IPV6 = YesPlease
 	NO_HSTRERROR = YesPlease
 	BASIC_CFLAGS += -Kthread
 	BASIC_CFLAGS += -I/usr/local/include
 	BASIC_LDFLAGS += -L/usr/local/lib
 	INSTALL = ginstall
 	TAR = gtar
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
 endif
 ifeq ($(uname_S),SCO_SV)
 	ifeq ($(uname_R),3.2)
 		CFLAGS = -O2
 	endif
 	ifeq ($(uname_R),5)
 		CC = cc
 		BASIC_CFLAGS += -Kthread
 	endif
 	NEEDS_SOCKET = YesPlease
 	NEEDS_NSL = YesPlease
 	NEEDS_SSL_WITH_CRYPTO = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	SHELL_PATH = /usr/bin/bash
 	NO_IPV6 = YesPlease
 	NO_HSTRERROR = YesPlease
 	BASIC_CFLAGS += -I/usr/local/include
 	BASIC_LDFLAGS += -L/usr/local/lib
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
 	INSTALL = ginstall
 	TAR = gtar
 endif
 ifeq ($(uname_S),Darwin)
 	NEEDS_CRYPTO_WITH_SSL = YesPlease
 	NEEDS_SSL_WITH_CRYPTO = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	# Note: $(uname_R) gives us the underlying Darwin version.
 	# - MacOS 10.0.* and MacOS 10.1.0 = Darwin 1.*
 	# - MacOS 10.x.* = Darwin (x+4).* for (1 <= x)
 	# i.e. "begins with [15678] and a dot" means "10.4.* or older".
 	ifeq ($(shell expr "$(uname_R)" : '[15678]\.'),2)
 		OLD_ICONV = UnfortunatelyYes
 		NO_APPLE_COMMON_CRYPTO = YesPlease
 	endif
 	ifeq ($(shell expr "$(uname_R)" : '[15]\.'),2)
 		NO_STRLCPY = YesPlease
 	endif
 	ifeq ($(shell test "`expr "$(uname_R)" : '\([0-9][0-9]*\)\.'`" -ge 11 && echo 1),1)
 		HAVE_GETDELIM = YesPlease
 	endif
 	ifeq ($(shell test "`expr "$(uname_R)" : '\([0-9][0-9]*\)\.'`" -ge 20 && echo 1),1)
 		OPEN_RETURNS_EINTR = UnfortunatelyYes
 	endif
 	NO_MEMMEM = YesPlease
 	USE_ST_TIMESPEC = YesPlease
 	HAVE_DEV_TTY = YesPlease
 	COMPAT_OBJS += compat/precompose_utf8.o
 	BASIC_CFLAGS += -DPRECOMPOSE_UNICODE
 	BASIC_CFLAGS += -DPROTECT_HFS_DEFAULT=1
 	HAVE_BSD_SYSCTL = YesPlease
 	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 	HAVE_NS_GET_EXECUTABLE_PATH = YesPlease
 	# Workaround for `gettext` being keg-only and not even being linked via
 	# `brew link --force gettext`, should be obsolete as of
 	# https://github.com/Homebrew/homebrew-core/pull/53489
 	ifeq ($(shell test -d /usr/local/opt/gettext/ && echo y),y)
 		BASIC_CFLAGS += -I/usr/local/include -I/usr/local/opt/gettext/include
 		BASIC_LDFLAGS += -L/usr/local/lib -L/usr/local/opt/gettext/lib
 		ifeq ($(shell test -x /usr/local/opt/gettext/bin/msgfmt && echo y),y)
 			MSGFMT = /usr/local/opt/gettext/bin/msgfmt
 		endif
 	endif
 endif
 ifeq ($(uname_S),SunOS)
 	NEEDS_SOCKET = YesPlease
 	NEEDS_NSL = YesPlease
 	SHELL_PATH = /bin/bash
 	SANE_TOOL_PATH = /usr/xpg6/bin:/usr/xpg4/bin
 	HAVE_ALLOCA_H = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
 	NO_MKDTEMP = YesPlease
 	NO_REGEX = YesPlease
 	NO_MSGFMT_EXTENDED_OPTIONS = YesPlease
 	HAVE_DEV_TTY = YesPlease
 	ifeq ($(uname_R),5.6)
 		SOCKLEN_T = int
 		NO_HSTRERROR = YesPlease
 		NO_IPV6 = YesPlease
 		NO_SOCKADDR_STORAGE = YesPlease
 		NO_UNSETENV = YesPlease
 		NO_SETENV = YesPlease
 		NO_STRLCPY = YesPlease
 		NO_STRTOUMAX = YesPlease
 		GIT_TEST_CMP = cmp
 	endif
 	ifeq ($(uname_R),5.7)
 		NEEDS_RESOLV = YesPlease
 		NO_IPV6 = YesPlease
 		NO_SOCKADDR_STORAGE = YesPlease
 		NO_UNSETENV = YesPlease
 		NO_SETENV = YesPlease
 		NO_STRLCPY = YesPlease
 		NO_STRTOUMAX = YesPlease
 		GIT_TEST_CMP = cmp
 	endif
 	ifeq ($(uname_R),5.8)
 		NO_UNSETENV = YesPlease
 		NO_SETENV = YesPlease
 		NO_STRTOUMAX = YesPlease
 		GIT_TEST_CMP = cmp
 	endif
 	ifeq ($(uname_R),5.9)
 		NO_UNSETENV = YesPlease
 		NO_SETENV = YesPlease
 		NO_STRTOUMAX = YesPlease
 		GIT_TEST_CMP = cmp
 	endif
 	INSTALL = /usr/ucb/install
 	TAR = gtar
 	BASIC_CFLAGS += -D__EXTENSIONS__ -D__sun__
 endif
 ifeq ($(uname_O),Cygwin)
 	ifeq ($(shell expr "$(uname_R)" : '1\.[1-6]\.'),4)
 		NO_D_TYPE_IN_DIRENT = YesPlease
 		NO_STRCASESTR = YesPlease
 		NO_MEMMEM = YesPlease
 		NO_SYMLINK_HEAD = YesPlease
 		NO_IPV6 = YesPlease
 		OLD_ICONV = UnfortunatelyYes
 		# There are conflicting reports about this.
 		# On some boxes NO_MMAP is needed, and not so elsewhere.
 		# Try commenting this out if you suspect MMAP is more efficient
 		NO_MMAP = YesPlease
 	else
 		NO_REGEX = UnfortunatelyYes
 	endif
 	HAVE_ALLOCA_H = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	NO_FAST_WORKING_DIRECTORY = UnfortunatelyYes
 	NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
 	X = .exe
 	UNRELIABLE_FSTAT = UnfortunatelyYes
 	OBJECT_CREATION_USES_RENAMES = UnfortunatelyNeedsTo
 	MMAP_PREVENTS_DELETE = UnfortunatelyYes
 	COMPAT_OBJS += compat/win32/path-utils.o
 	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 endif
 ifeq ($(uname_S),FreeBSD)
 	NEEDS_LIBICONV = YesPlease
 	# Versions up to 10.1 require OLD_ICONV; 10.2 and beyond don't.
 	# A typical version string looks like "10.2-RELEASE".
 	ifeq ($(shell expr "$(uname_R)" : '[1-9]\.'),2)
 		OLD_ICONV = YesPlease
 	endif
 	ifeq ($(firstword $(subst -, ,$(uname_R))),10.0)
 		OLD_ICONV = YesPlease
 	endif
 	ifeq ($(firstword $(subst -, ,$(uname_R))),10.1)
 		OLD_ICONV = YesPlease
 	endif
 	NO_MEMMEM = YesPlease
 	BASIC_CFLAGS += -I/usr/local/include
 	BASIC_LDFLAGS += -L/usr/local/lib
 	DIR_HAS_BSD_GROUP_SEMANTICS = YesPlease
 	USE_ST_TIMESPEC = YesPlease
 	ifeq ($(shell expr "$(uname_R)" : '4\.'),2)
 		PTHREAD_LIBS = -pthread
 		NO_UINTMAX_T = YesPlease
 		NO_STRTOUMAX = YesPlease
 	endif
 	PYTHON_PATH = /usr/local/bin/python
 	PERL_PATH = /usr/local/bin/perl
 	HAVE_PATHS_H = YesPlease
 	HAVE_BSD_SYSCTL = YesPlease
 	HAVE_BSD_KERN_PROC_SYSCTL = YesPlease
 	PAGER_ENV = LESS=FRX LV=-c MORE=FRX
 	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 	FILENO_IS_A_MACRO = UnfortunatelyYes
 endif
 ifeq ($(uname_S),OpenBSD)
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
 	USE_ST_TIMESPEC = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	BASIC_CFLAGS += -I/usr/local/include
 	BASIC_LDFLAGS += -L/usr/local/lib
 	HAVE_PATHS_H = YesPlease
 	HAVE_BSD_SYSCTL = YesPlease
 	HAVE_BSD_KERN_PROC_SYSCTL = YesPlease
 	PROCFS_EXECUTABLE_PATH = /proc/curproc/file
 	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 	FILENO_IS_A_MACRO = UnfortunatelyYes
 endif
 ifeq ($(uname_S),MirBSD)
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
 	USE_ST_TIMESPEC = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	HAVE_PATHS_H = YesPlease
 	HAVE_BSD_SYSCTL = YesPlease
 endif
 ifeq ($(uname_S),NetBSD)
 	ifeq ($(shell expr "$(uname_R)" : '[01]\.'),2)
 		NEEDS_LIBICONV = YesPlease
 	endif
 	BASIC_CFLAGS += -I/usr/pkg/include
 	BASIC_LDFLAGS += -L/usr/pkg/lib $(CC_LD_DYNPATH)/usr/pkg/lib
 	USE_ST_TIMESPEC = YesPlease
 	HAVE_PATHS_H = YesPlease
 	HAVE_BSD_SYSCTL = YesPlease
 	HAVE_BSD_KERN_PROC_SYSCTL = YesPlease
 	PROCFS_EXECUTABLE_PATH = /proc/curproc/exe
 endif
 ifeq ($(uname_S),AIX)
 	DEFAULT_PAGER = more
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
 	NO_MKDTEMP = YesPlease
 	NO_STRLCPY = YesPlease
 	NO_NSEC = YesPlease
 	NO_REGEX = NeedsStartEnd
 	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 	INTERNAL_QSORT = UnfortunatelyYes
 	NEEDS_LIBICONV = YesPlease
 	BASIC_CFLAGS += -D_LARGE_FILES
 	FILENO_IS_A_MACRO = UnfortunatelyYes
 	NEED_ACCESS_ROOT_HANDLER = UnfortunatelyYes
 	ifeq ($(shell expr "$(uname_V)" : '[1234]'),1)
 		NO_PTHREADS = YesPlease
 	else
 		PTHREAD_LIBS = -lpthread
 	endif
 	ifeq ($(shell expr "$(uname_V).$(uname_R)" : '5\.1'),3)
 		INLINE = ''
 	endif
 	GIT_TEST_CMP = cmp
 endif
 ifeq ($(uname_S),GNU)
 	# GNU/Hurd
 	HAVE_ALLOCA_H = YesPlease
 	NO_STRLCPY = YesPlease
 	HAVE_PATHS_H = YesPlease
 	LIBC_CONTAINS_LIBINTL = YesPlease
 	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 endif
 ifeq ($(uname_S),IRIX)
 	NO_SETENV = YesPlease
 	NO_UNSETENV = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
 	NO_MKDTEMP = YesPlease
 	# When compiled with the MIPSpro 7.4.4m compiler, and without pthreads
 	# (i.e. NO_PTHREADS is set), and _with_ MMAP (i.e. NO_MMAP is not set),
 	# git dies with a segmentation fault when trying to access the first
 	# entry of a reflog.  The conservative choice is made to always set
 	# NO_MMAP.  If you suspect that your compiler is not affected by this
 	# issue, comment out the NO_MMAP statement.
 	NO_MMAP = YesPlease
 	NO_REGEX = YesPlease
 	SNPRINTF_RETURNS_BOGUS = YesPlease
 	SHELL_PATH = /usr/gnu/bin/bash
 	NEEDS_LIBGEN = YesPlease
 endif
 ifeq ($(uname_S),IRIX64)
 	NO_SETENV = YesPlease
 	NO_UNSETENV = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
 	NO_MKDTEMP = YesPlease
 	# When compiled with the MIPSpro 7.4.4m compiler, and without pthreads
 	# (i.e. NO_PTHREADS is set), and _with_ MMAP (i.e. NO_MMAP is not set),
 	# git dies with a segmentation fault when trying to access the first
 	# entry of a reflog.  The conservative choice is made to always set
 	# NO_MMAP.  If you suspect that your compiler is not affected by this
 	# issue, comment out the NO_MMAP statement.
 	NO_MMAP = YesPlease
 	NO_REGEX = YesPlease
 	SNPRINTF_RETURNS_BOGUS = YesPlease
 	SHELL_PATH = /usr/gnu/bin/bash
 	NEEDS_LIBGEN = YesPlease
 endif
 ifeq ($(uname_S),HP-UX)
 	INLINE = __inline
 	NO_IPV6 = YesPlease
 	NO_SETENV = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
 	NO_STRLCPY = YesPlease
 	NO_MKDTEMP = YesPlease
 	NO_UNSETENV = YesPlease
 	NO_HSTRERROR = YesPlease
 	NO_SYS_SELECT_H = YesPlease
 	SNPRINTF_RETURNS_BOGUS = YesPlease
 	NO_NSEC = YesPlease
 	ifeq ($(uname_R),B.11.00)
 		NO_INET_NTOP = YesPlease
 		NO_INET_PTON = YesPlease
 	endif
 	ifeq ($(uname_R),B.10.20)
 		# Override HP-UX 11.x setting:
 		INLINE =
 		SOCKLEN_T = size_t
 		NO_PREAD = YesPlease
 		NO_INET_NTOP = YesPlease
 		NO_INET_PTON = YesPlease
 	endif
 	GIT_TEST_CMP = cmp
 endif
 ifeq ($(uname_S),Windows)
 	GIT_VERSION := $(GIT_VERSION).MSVC
 	pathsep = ;
 	# Assume that this is built in Git for Windows' SDK
 	ifeq (MINGW32,$(MSYSTEM))
 		prefix = /mingw32
 	else
 		prefix = /mingw64
 	endif
 	# Prepend MSVC 64-bit tool-chain to PATH.
 	#
 	# A regular Git Bash *does not* have cl.exe in its $PATH. As there is a
 	# link.exe next to, and required by, cl.exe, we have to prepend this
 	# onto the existing $PATH.
 	#
 	SANE_TOOL_PATH ?= $(msvc_bin_dir_msys)
 	HAVE_ALLOCA_H = YesPlease
 	NO_PREAD = YesPlease
 	NEEDS_CRYPTO_WITH_SSL = YesPlease
 	NO_LIBGEN_H = YesPlease
 	NO_POLL = YesPlease
 	NO_SYMLINK_HEAD = YesPlease
 	NO_IPV6 = YesPlease
 	NO_UNIX_SOCKETS = YesPlease
 	NO_SETENV = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_STRLCPY = YesPlease
 	NO_MEMMEM = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	NO_STRTOUMAX = YesPlease
 	NO_MKDTEMP = YesPlease
 	NO_INTTYPES_H = YesPlease
 	# VS2015 with UCRT claims that snprintf and friends are C99 compliant,
 	# so we don't need this:
 	#
 	#   SNPRINTF_RETURNS_BOGUS = YesPlease
 	NO_SVN_TESTS = YesPlease
 	RUNTIME_PREFIX = YesPlease
 	HAVE_WPGMPTR = YesWeDo
 	NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
 	USE_WIN32_IPC = YesPlease
 	USE_WIN32_MMAP = YesPlease
 	MMAP_PREVENTS_DELETE = UnfortunatelyYes
 	# USE_NED_ALLOCATOR = YesPlease
 	UNRELIABLE_FSTAT = UnfortunatelyYes
 	OBJECT_CREATION_USES_RENAMES = UnfortunatelyNeedsTo
 	NO_REGEX = YesPlease
 	NO_GETTEXT = YesPlease
 	NO_PYTHON = YesPlease
 	ETAGS_TARGET = ETAGS
 	NO_POSIX_GOODIES = UnfortunatelyYes
 	NATIVE_CRLF = YesPlease
 	DEFAULT_HELP_FORMAT = html
 ifeq (/mingw64,$(subst 32,64,$(prefix)))
 	# Move system config into top-level /etc/
 	ETC_GITCONFIG = ../etc/gitconfig
 	ETC_GITATTRIBUTES = ../etc/gitattributes
 endif
 	CC = compat/vcbuild/scripts/clink.pl
 	AR = compat/vcbuild/scripts/lib.pl
 	CFLAGS =
 	BASIC_CFLAGS = -nologo -I. -Icompat/vcbuild/include -DWIN32 -D_CONSOLE -DHAVE_STRING_H -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE
 	COMPAT_OBJS = compat/msvc.o compat/winansi.o \
 		compat/win32/path-utils.o \
 		compat/win32/pthread.o compat/win32/syslog.o \
 		compat/win32/trace2_win32_process_info.o \
 		compat/win32/dirent.o
 	COMPAT_CFLAGS = -D__USE_MINGW_ACCESS -DDETECT_MSYS_TTY -DNOGDI -DHAVE_STRING_H -Icompat -Icompat/regex -Icompat/win32 -DSTRIP_EXTENSION=\".exe\"
 	BASIC_LDFLAGS = -IGNORE:4217 -IGNORE:4049 -NOLOGO -ENTRY:wmainCRTStartup -SUBSYSTEM:CONSOLE
 	# invalidcontinue.obj allows Git's source code to close the same file
 	# handle twice, or to access the osfhandle of an already-closed stdout
 	# See https://msdn.microsoft.com/en-us/library/ms235330.aspx
 	EXTLIBS = user32.lib advapi32.lib shell32.lib wininet.lib ws2_32.lib invalidcontinue.obj kernel32.lib ntdll.lib
 	PTHREAD_LIBS =
 	lib =
 	BASIC_CFLAGS += $(vcpkg_inc) $(sdk_includes) $(msvc_includes)
 ifndef DEBUG
 	BASIC_CFLAGS += $(vcpkg_rel_lib)
 else
 	BASIC_CFLAGS += $(vcpkg_dbg_lib)
 endif
 	BASIC_CFLAGS += $(sdk_libs) $(msvc_libs)
 ifneq ($(USE_MSVC_CRTDBG),)
 	# Optionally enable memory leak reporting.
 	BASIC_CFLAGS += -DUSE_MSVC_CRTDBG
 endif
 	# Always give "-Zi" to the compiler and "-debug" to linker (even in
 	# release mode) to force a PDB to be generated (like RelWithDebInfo).
 	BASIC_CFLAGS += -Zi
 	BASIC_LDFLAGS += -debug -Zf
 ifdef NO_SAFESEH
 	LDFLAGS += -SAFESEH:NO
 endif
 ifndef DEBUG
 	BASIC_CFLAGS += -GL -Gy -O2 -Oy- -MD -DNDEBUG
 	BASIC_LDFLAGS += -release -LTCG /OPT:REF /OPT:ICF /INCREMENTAL:NO /DEBUGTYPE:CV,FIXUP
 	AR += -LTCG
 else
 	BASIC_CFLAGS += -MDd -DDEBUG -D_DEBUG
 endif
 	X = .exe
 compat/msvc.o: compat/msvc.c compat/mingw.c GIT-CFLAGS
 endif
 ifeq ($(uname_S),Interix)
 	NO_INITGROUPS = YesPlease
 	NO_IPV6 = YesPlease
 	NO_MEMMEM = YesPlease
 	NO_MKDTEMP = YesPlease
 	NO_STRTOUMAX = YesPlease
 	NO_NSEC = YesPlease
 	ifeq ($(uname_R),3.5)
 		NO_INET_NTOP = YesPlease
 		NO_INET_PTON = YesPlease
 		NO_SOCKADDR_STORAGE = YesPlease
 	endif
 	ifeq ($(uname_R),5.2)
 		NO_INET_NTOP = YesPlease
 		NO_INET_PTON = YesPlease
 		NO_SOCKADDR_STORAGE = YesPlease
 	endif
 endif
 ifeq ($(uname_S),Minix)
 	NO_IPV6 = YesPlease
 	NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
 	NO_NSEC = YesPlease
 	NEEDS_LIBGEN =
 	NEEDS_CRYPTO_WITH_SSL = YesPlease
 	NEEDS_RESOLV =
 	NO_HSTRERROR = YesPlease
 	NO_MMAP = YesPlease
 	NO_CURL =
 	NO_EXPAT =
 endif
 ifeq ($(uname_S),NONSTOP_KERNEL)
 	# Needs some C99 features, "inline" is just one of them.
 	# INLINE='' would just replace one set of warnings with another and
 	# still not compile in c89 mode, due to non-const array initializations.
 	CC = cc -c99
 	# Build down-rev compatible objects that don't use our new getopt_long.
 	ifeq ($(uname_R).$(uname_V),J06.21)
 		CC += -WRVU=J06.20
 	endif
 	ifeq ($(uname_R).$(uname_V),L17.02)
 		CC += -WRVU=L16.05
 	endif
 	# Disable all optimization, seems to result in bad code, with -O or -O2
 	# or even -O1 (default), /usr/local/libexec/git-core/git-pack-objects
 	# abends on "git push". Needs more investigation.
 	CFLAGS = -g -O0 -Winline
 	# We'd want it to be here.
 	prefix = /usr/local
 	# perl and python must be in /usr/bin on NonStop - supplied by HPE
 	# with operating system in that managed directory.
 	PERL_PATH = /usr/bin/perl
 	PYTHON_PATH = /usr/bin/python
 	# The current /usr/coreutils/rm at lowest support level does not work
 	# with the git test structure. Long paths as in
 	# 'trash directory...' cause rm to terminate prematurely without fully
 	# removing the directory at OS releases J06.21 and L17.02.
 	# Default to the older rm until those two releases are deprecated.
 	RM = /bin/rm -f
 	NEEDS_CRYPTO_WITH_SSL = YesPlease
 	HAVE_DEV_TTY = YesPlease
 	HAVE_LIBCHARSET_H = YesPlease
 	HAVE_STRINGS_H = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	NEEDS_LIBINTL_BEFORE_LIBICONV = YesPlease
 	NO_SYS_SELECT_H = UnfortunatelyYes
 	NO_D_TYPE_IN_DIRENT = YesPlease
 	NO_GETTEXT = YesPlease
 	NO_HSTRERROR = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
 	NO_STRLCPY = YesPlease
 	NO_SETENV = YesPlease
 	NO_UNSETENV = YesPlease
 	NO_MKDTEMP = YesPlease
 	# Currently libiconv-1.9.1.
 	OLD_ICONV = UnfortunatelyYes
 	NO_REGEX = NeedsStartEnd
 	NO_PTHREADS = UnfortunatelyYes
 	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 	# Not detected (nor checked for) by './configure'.
 	# We don't have SA_RESTART on NonStop, unfortunalety.
 	COMPAT_CFLAGS += -DSA_RESTART=0
 	# Apparently needed in compat/fnmatch/fnmatch.c.
 	COMPAT_CFLAGS += -DHAVE_STRING_H=1
 	NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
 	NO_NSEC = YesPlease
 	NO_PREAD = YesPlease
 	NO_MMAP = YesPlease
 	NO_POLL = YesPlease
 	NO_INTPTR_T = UnfortunatelyYes
 	SANE_TOOL_PATH = /usr/coreutils/bin:/usr/local/bin
 	SHELL_PATH = /usr/coreutils/bin/bash
 endif
 ifeq ($(uname_S),MINGW)
 	pathsep = ;
 	HAVE_ALLOCA_H = YesPlease
 	NO_PREAD = YesPlease
 	NEEDS_CRYPTO_WITH_SSL = YesPlease
 	NO_LIBGEN_H = YesPlease
 	NO_POLL = YesPlease
 	NO_SYMLINK_HEAD = YesPlease
 	NO_UNIX_SOCKETS = YesPlease
 	NO_SETENV = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_STRLCPY = YesPlease
 	NO_MEMMEM = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	NO_STRTOUMAX = YesPlease
 	NO_MKDTEMP = YesPlease
 	NO_SVN_TESTS = YesPlease
 	RUNTIME_PREFIX = YesPlease
 	HAVE_WPGMPTR = YesWeDo
 	NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
 	USE_WIN32_IPC = YesPlease
 	USE_WIN32_MMAP = YesPlease
 	MMAP_PREVENTS_DELETE = UnfortunatelyYes
 	USE_NED_ALLOCATOR = YesPlease
 	UNRELIABLE_FSTAT = UnfortunatelyYes
 	OBJECT_CREATION_USES_RENAMES = UnfortunatelyNeedsTo
 	NO_REGEX = YesPlease
 	NO_PYTHON = YesPlease
 	ETAGS_TARGET = ETAGS
 	NO_POSIX_GOODIES = UnfortunatelyYes
 	DEFAULT_HELP_FORMAT = html
 	HAVE_PLATFORM_PROCINFO = YesPlease
 	BASIC_LDFLAGS += -municode
 	COMPAT_CFLAGS += -DNOGDI -Icompat -Icompat/win32
 	COMPAT_CFLAGS += -DSTRIP_EXTENSION=\".exe\"
 	COMPAT_OBJS += compat/mingw.o compat/winansi.o \
 		compat/win32/trace2_win32_process_info.o \
 		compat/win32/path-utils.o \
 		compat/win32/pthread.o compat/win32/syslog.o \
 		compat/win32/dirent.o
 	BASIC_CFLAGS += -DWIN32
 	EXTLIBS += -lws2_32
 	GITLIBS += git.res
 	PTHREAD_LIBS =
 	RC = windres -O coff
 	NATIVE_CRLF = YesPlease
 	X = .exe
 ifneq (,$(wildcard ../THIS_IS_MSYSGIT))
 	htmldir = doc/git/html/
 	prefix =
 	INSTALL = /bin/install
 	EXTLIBS += /mingw/lib/libz.a
 	INTERNAL_QSORT = YesPlease
 	HAVE_LIBCHARSET_H = YesPlease
 	NO_GETTEXT = YesPlease
 	COMPAT_CFLAGS += -D__USE_MINGW_ACCESS
 else
 	ifneq ($(shell expr "$(uname_R)" : '1\.'),2)
 		# MSys2
 		prefix = /usr/
 		# Enable DEP
 		BASIC_LDFLAGS += -Wl,--nxcompat
 		# Enable ASLR (unless debugging)
 		ifneq (,$(findstring -O,$(filter-out -O0 -Og,$(CFLAGS))))
 			BASIC_LDFLAGS += -Wl,--dynamicbase
 		endif
 		ifeq (MINGW32,$(MSYSTEM))
 			prefix = /mingw32
 			HOST_CPU = i686
 			BASIC_LDFLAGS += -Wl,--pic-executable,-e,_mainCRTStartup
 		endif
 		ifeq (MINGW64,$(MSYSTEM))
 			prefix = /mingw64
 			HOST_CPU = x86_64
 			BASIC_LDFLAGS += -Wl,--pic-executable,-e,mainCRTStartup
 		else
 			COMPAT_CFLAGS += -D_USE_32BIT_TIME_T
 			BASIC_LDFLAGS += -Wl,--large-address-aware
 		endif
 		CC = gcc
 		COMPAT_CFLAGS += -D__USE_MINGW_ANSI_STDIO=0 -DDETECT_MSYS_TTY \
 			-fstack-protector-strong
 		EXTLIBS += -lntdll
 		INSTALL = /bin/install
 		INTERNAL_QSORT = YesPlease
 		HAVE_LIBCHARSET_H = YesPlease
 		NO_GETTEXT =
 		USE_GETTEXT_SCHEME = fallthrough
 		USE_LIBPCRE = YesPlease
 		NO_CURL =
 		USE_NED_ALLOCATOR = YesPlease
 		ifeq (/mingw64,$(subst 32,64,$(prefix)))
 			# Move system config into top-level /etc/
 			ETC_GITCONFIG = ../etc/gitconfig
 			ETC_GITATTRIBUTES = ../etc/gitattributes
 		endif
 	else
 		COMPAT_CFLAGS += -D__USE_MINGW_ANSI_STDIO
 		NO_CURL = YesPlease
 	endif
 endif
 endif
 ifeq ($(uname_S),QNX)
 	COMPAT_CFLAGS += -DSA_RESTART=0
 	EXPAT_NEEDS_XMLPARSE_H = YesPlease
 	HAVE_STRINGS_H = YesPlease
 	NEEDS_SOCKET = YesPlease
 	NO_GETPAGESIZE = YesPlease
 	NO_ICONV = YesPlease
 	NO_MEMMEM = YesPlease
 	NO_MKDTEMP = YesPlease
 	NO_NSEC = YesPlease
 	NO_PTHREADS = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_STRLCPY = YesPlease
 endif
 vcxproj:
 	# Require clean work tree
 	git update-index -q --refresh && \
 	git diff-files --quiet && \
 	git diff-index --cached --quiet HEAD --
 	# Make .vcxproj files and add them
 	unset QUIET_GEN QUIET_BUILT_IN; \
 	perl contrib/buildsystems/generate -g Vcxproj
 	git add -f git.sln {*,*/lib,t/helper/*}/*.vcxproj
 	# Generate the LinkOrCopyBuiltins.targets and LinkOrCopyRemoteHttp.targets file
 	(echo '<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">' && \
 	 echo '  <Target Name="CopyBuiltins_AfterBuild" AfterTargets="AfterBuild">' && \
 	 for name in $(BUILT_INS);\
 	 do \
 	   echo '    <Copy SourceFiles="$$(OutDir)\git.exe" DestinationFiles="$$(OutDir)\'"$$name"'" SkipUnchangedFiles="true" UseHardlinksIfPossible="true" />'; \
 	 done && \
 	 echo '  </Target>' && \
 	 echo '</Project>') >git/LinkOrCopyBuiltins.targets
 	(echo '<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">' && \
 	 echo '  <Target Name="CopyBuiltins_AfterBuild" AfterTargets="AfterBuild">' && \
 	 for name in $(REMOTE_CURL_ALIASES); \
 	 do \
 	   echo '    <Copy SourceFiles="$$(OutDir)\'"$(REMOTE_CURL_PRIMARY)"'" DestinationFiles="$$(OutDir)\'"$$name"'" SkipUnchangedFiles="true" UseHardlinksIfPossible="true" />'; \
 	 done && \
 	 echo '  </Target>' && \
 	 echo '</Project>') >git-remote-http/LinkOrCopyRemoteHttp.targets
 	git add -f git/LinkOrCopyBuiltins.targets git-remote-http/LinkOrCopyRemoteHttp.targets
 	# Add generated headers
 	$(MAKE) MSVC=1 SKIP_VCPKG=1 prefix=/mingw64 $(GENERATED_H)
 	git add -f $(GENERATED_H)
 	# Add scripts
 	rm -f perl/perl.mak
 	$(MAKE) MSVC=1 SKIP_VCPKG=1 prefix=/mingw64 $(SCRIPT_LIB) $(SCRIPTS)
 	# Strip out the sane tool path, needed only for building
 	sed -i '/^git_broken_path_fix ".*/d' git-sh-setup
 	git add -f $(SCRIPT_LIB) $(SCRIPTS)
 	# Add Perl module
 	$(MAKE) $(LIB_PERL_GEN)
 	git add -f perl/build
 	# Add bin-wrappers, for testing
 	rm -rf bin-wrappers/
 	$(MAKE) MSVC=1 SKIP_VCPKG=1 prefix=/mingw64 $(test_bindir_programs)
 	# Ensure that the GIT_EXEC_PATH is a Unix-y one, and that the absolute
 	# path of the repository is not hard-coded (GIT_EXEC_PATH will be set
 	# by test-lib.sh according to the current setup)
 	sed -i -e 's/^\(GIT_EXEC_PATH\)=.*/test -n "$${\1##*:*}" ||\
 			\1="$$(cygpath -u "$$\1")"/' \
 		-e "s|'$$(pwd)|\"\$$GIT_EXEC_PATH\"'|g" bin-wrappers/*
 	# Ensure that test-* helpers find the .dll files copied to top-level
 	sed -i 's|^PATH=.*|&:"$$GIT_EXEC_PATH"|' bin-wrappers/test-*
 	# We do not want to force hard-linking builtins
 	sed -i 's|\(git\)-\([-a-z]*\)\.exe"|\1.exe" \2|g' \
 		bin-wrappers/git-{receive-pack,upload-archive}
 	git add -f $(test_bindir_programs)
 	# remote-ext is a builtin, but invoked as if it were external
 	sed 's|receive-pack|remote-ext|g' \
 		<bin-wrappers/git-receive-pack >bin-wrappers/git-remote-ext
 	git add -f bin-wrappers/git-remote-ext
 	# Add templates
 	$(MAKE) -C templates
 	git add -f templates/boilerplates.made templates/blt/
 	# Add the translated messages
 	make MSVC=1 SKIP_VCPKG=1 prefix=/mingw64 $(MOFILES)
 	git add -f $(MOFILES)
 	# Add build options
 	$(MAKE) MSVC=1 SKIP_VCPKG=1 prefix=/mingw64 GIT-BUILD-OPTIONS
 	git add -f GIT-BUILD-OPTIONS
 	# Commit the whole shebang
 	git commit -m "Generate Visual Studio solution" \
 		-m "Auto-generated by \`$(MAKE)$(MAKEFLAGS) $@\`"