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newlib-cygwin
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Cygwin: Makefile: only regenerate cygwin_version.c if it changes 

Make sure to create a new cygwin_version.c if it either doesn't
exist yet, or if it would be different from the former file.
This avoids unnecessary DLL rebuilding.

Fixes: 97eb64b909 ("Cygwin: uname: generate default release string from git as well")
Fixes: 4949a82cde ("Cygwin: uname: fix building in non-git source dir")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2022-12-13 13:25:06 +01:00
parent c8d5210337
commit f34db341fc
1 changed files with 9 additions and 1 deletions
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10
winsup/cygwin/Makefile.am
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@ -419,12 +419,20 @@ dirs = $(srcdir) $(srcdir)/fhandler $(srcdir)/lib $(srcdir)/libc $(srcdir)/math
find_src_files = $(wildcard $(dir)/*.[chS]) $(wildcard $(dir)/*.cc) find_src_files = $(wildcard $(dir)/*.[chS]) $(wildcard $(dir)/*.cc)
src_files := $(foreach dir,$(dirs),$(find_src_files)) src_files := $(foreach dir,$(dirs),$(find_src_files))
# Regenerate uname_version.c only if it doesn't exist or if it differs
# from the former uname_version.c
uname_version.c: .FORCE uname_version.c: .FORCE
$(AM_V_GEN)cd $(srcdir) && \ $(AM_V_GEN)cd $(srcdir) && \
echo "const char *uname_dev_version = \ echo "const char *uname_dev_version = \
\"$$(git rev-parse --git-dir >/dev/null 2>&1 && \ \"$$(git rev-parse --git-dir >/dev/null 2>&1 && \
git describe --dirty | sed -e 's/cygwin-//')\";" \ git describe --dirty | sed -e 's/cygwin-//')\";" \
> $(abs_builddir)/uname_version.c > $(abs_builddir)/uname_version-pre.c && \
if [ -f $(abs_builddir)/uname_version.c ] && \
cmp $(abs_builddir)/uname_version.c \
$(abs_builddir)/uname_version-pre.c >/dev/null 2>&1 ; \
then :; else \
mv $(abs_builddir)/uname_version-pre.c \
$(abs_builddir)/uname_version.c; fi
.FORCE: .FORCE:
# mkvers.sh creates version.cc in the first place, winver.o always # mkvers.sh creates version.cc in the first place, winver.o always