Makefile: propagate Git version via generated header

We set up a couple of preprocessor macros when compiling Git that
propagate the version that Git was built from to `git version` et al.
The way this is set up makes it harder than necessary to reuse the
infrastructure across the different build systems.

Refactor this such that we generate a "version-def.h" header via
`GIT-VERSION-GEN` instead.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/.gitignore b/.gitignore
index 6687bd6db4c0a6adf02292a9cb545d3e5270e2b0..e17963e84252fa094c10f5e84c0e3724153c819c 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -195,6 +195,7 @@
 /config-list.h
 /command-list.h
 /hook-list.h
+/version-def.h
 *.tar.gz
 *.dsc
 *.deb

diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index 7afc7aad1413d552cbadc68b7582ba639faa4d8a..c18f24e515436b71ef40120b88b6fbb0b5621c01 100755 (executable)
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -52,6 +52,11 @@ else
 fi
 
 GIT_VERSION=$(expr "$VN" : v*'\(.*\)')
+GIT_BUILT_FROM_COMMIT=$(git -C "$SOURCE_DIR" rev-parse -q --verify HEAD 2>/dev/null)
+if test -z "$GIT_USER_AGENT"
+then
+       GIT_USER_AGENT="git/$GIT_VERSION"
+fi
 
 read GIT_MAJOR_VERSION GIT_MINOR_VERSION GIT_MICRO_VERSION trailing <<EOF
 $(echo "$GIT_VERSION" 0 0 0 | tr '.a-zA-Z-' ' ')
@@ -61,6 +66,8 @@ sed -e "s|@GIT_VERSION@|$GIT_VERSION|" \
        -e "s|@GIT_MAJOR_VERSION@|$GIT_MAJOR_VERSION|" \
        -e "s|@GIT_MINOR_VERSION@|$GIT_MINOR_VERSION|" \
        -e "s|@GIT_MICRO_VERSION@|$GIT_MICRO_VERSION|" \
+       -e "s|@GIT_BUILT_FROM_COMMIT@|$GIT_BUILT_FROM_COMMIT|" \
+       -e "s|@GIT_USER_AGENT@|$GIT_USER_AGENT|" \
        "$INPUT" >"$OUTPUT"+
 
 if ! test -f "$OUTPUT" || ! cmp "$OUTPUT"+ "$OUTPUT" >/dev/null

diff --git a/Makefile b/Makefile
index 73510d6bcbc9ca60d45b70459f9e1c79f19b4c09..7150ffc39c1b444a2c4775382f943c603490d54e 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -2508,13 +2508,11 @@ PAGER_ENV_CQ_SQ = $(subst ','\'',$(PAGER_ENV_CQ))
 pager.sp pager.s pager.o: EXTRA_CPPFLAGS = \
        -DPAGER_ENV='$(PAGER_ENV_CQ_SQ)'
 
-version.sp version.s version.o: GIT-VERSION-FILE GIT-USER-AGENT
-version.sp version.s version.o: EXTRA_CPPFLAGS = \
-       '-DGIT_VERSION="$(GIT_VERSION)"' \
-       '-DGIT_USER_AGENT=$(GIT_USER_AGENT_CQ_SQ)' \
-       '-DGIT_BUILT_FROM_COMMIT="$(shell \
-               GIT_CEILING_DIRECTORIES="$(CURDIR)/.." \
-               git rev-parse -q --verify HEAD 2>/dev/null)"'
+version-def.h: version-def.h.in GIT-VERSION-GEN GIT-VERSION-FILE GIT-USER-AGENT
+       $(QUIET_GEN)GIT_USER_AGENT="$(GIT_USER_AGENT)" $(SHELL_PATH) ./GIT-VERSION-GEN "$(shell pwd)" $< $@+
+       @if cmp $@+ $@ >/dev/null 2>&1; then $(RM) $@+; else mv $@+ $@; fi
+
+version.sp version.s version.o: version-def.h
 
 $(BUILT_INS): git$X
        $(QUIET_BUILT_IN)$(RM) $@ && \
@@ -3728,6 +3726,7 @@ clean: profile-clean coverage-clean cocciclean
        $(RM) $(FUZZ_PROGRAMS)
        $(RM) $(SP_OBJ)
        $(RM) $(HCC)
+       $(RM) version-def.h
        $(RM) -r bin-wrappers $(dep_dirs) $(compdb_dir) compile_commands.json
        $(RM) -r po/build/
        $(RM) *.pyc *.pyo */*.pyc */*.pyo $(GENERATED_H) $(ETAGS_TARGET) tags cscope*

diff --git a/contrib/buildsystems/CMakeLists.txt b/contrib/buildsystems/CMakeLists.txt
index 376d748ce9021710eb72258ab3b9bac52950a933..3cc5e318190292dd66981aa8593e7bd2739eea1d 100644 (file)
--- a/contrib/buildsystems/CMakeLists.txt
+++ b/contrib/buildsystems/CMakeLists.txt
@@ -229,10 +229,7 @@ add_compile_definitions(PAGER_ENV="LESS=FRX LV=-c"
                        GIT_HTML_PATH="share/doc/git-doc"
                        DEFAULT_HELP_FORMAT="html"
                        DEFAULT_GIT_TEMPLATE_DIR="share/git-core/templates"
-                       GIT_VERSION="${PROJECT_VERSION}.GIT"
-                       GIT_USER_AGENT="git/${PROJECT_VERSION}.GIT"
-                       BINDIR="bin"
-                       GIT_BUILT_FROM_COMMIT="")
+                       BINDIR="bin")
 
 if(WIN32)
        set(FALLBACK_RUNTIME_PREFIX /mingw64)
@@ -668,6 +665,17 @@ parse_makefile_for_sources(libgit_SOURCES "LIB_OBJS")
 
 list(TRANSFORM libgit_SOURCES PREPEND "${CMAKE_SOURCE_DIR}/")
 list(TRANSFORM compat_SOURCES PREPEND "${CMAKE_SOURCE_DIR}/")
+
+add_custom_command(OUTPUT "${CMAKE_BINARY_DIR}/version-def.h"
+       COMMAND "${SH_EXE}" "${CMAKE_SOURCE_DIR}/GIT-VERSION-GEN"
+               "${CMAKE_SOURCE_DIR}"
+               "${CMAKE_SOURCE_DIR}/version-def.h.in"
+               "${CMAKE_BINARY_DIR}/version-def.h"
+       DEPENDS "${SH_EXE}" "${CMAKE_SOURCE_DIR}/GIT-VERSION-GEN"
+               "${CMAKE_SOURCE_DIR}/version-def.h.in"
+       VERBATIM)
+list(APPEND libgit_SOURCES "${CMAKE_BINARY_DIR}/version-def.h")
+
 add_library(libgit ${libgit_SOURCES} ${compat_SOURCES})
 
 #libxdiff

diff --git a/version-def.h.in b/version-def.h.in
new file mode 100644 (file)
index 0000000..347995d
--- /dev/null
+++ b/version-def.h.in
@@ -0,0 +1,8 @@
+#ifndef VERSION_DEF_H
+#define VERSION_DEF_H
+
+#define GIT_VERSION "@GIT_VERSION@"
+#define GIT_BUILT_FROM_COMMIT "@GIT_BUILT_FROM_COMMIT@"
+#define GIT_USER_AGENT "@GIT_USER_AGENT@"
+
+#endif /* VERSION_DEF_H */

diff --git a/version.c b/version.c
index 41b718c29e1b9fc2981d7d14a3d25e69c31a3030..7adc4d51ff25a0841607c21807deaf20721252de 100644 (file)
--- a/version.c
+++ b/version.c
@@ -1,5 +1,6 @@
 #include "git-compat-util.h"
 #include "version.h"
+#include "version-def.h"
 #include "strbuf.h"
 
 const char git_version_string[] = GIT_VERSION;