[binutils-gdb] libctf: workaround automake bug with conditional info pages

[Michael Frysinger <vapier@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=ba4ba9711a1356909275196c2abfd33f7d0950a6

commit ba4ba9711a1356909275196c2abfd33f7d0950a6
Author: Mike Frysinger <vapier@gentoo.org>
Date:   Thu Dec 2 23:13:15 2021 -0500

    libctf: workaround automake bug with conditional info pages
    
    It looks like automake makes assumptions about its ability to build info
    pages based on the GNU standard behavior of shipping info pages with the
    distributions.  So even though the info pages were conditionalized, and
    automake disabled some of the targets, it was still creeping in by way
    of unconditional INFO_DEPS settings.
    
    We can workaround this by adding a stub target for the info page when
    building info pages are disabled.  This tricks automake into disabling
    its own extended generation target.  I'll follow up with the automake
    folks to see what they think.

Diff:
---
 libctf/Makefile.am  |  2 --
 libctf/Makefile.in  | 40 ++++++++++++++++++++++------------------
 libctf/doc/local.mk | 10 ++++++++++
 3 files changed, 32 insertions(+), 20 deletions(-)

diff --git a/libctf/Makefile.am b/libctf/Makefile.am
index 3e51b7b30d0..8d317018556 100644
--- a/libctf/Makefile.am
+++ b/libctf/Makefile.am
@@ -114,6 +114,4 @@ EXTRA_DEJAGNU_SITE_CONFIG = development.exp
 DISTCLEANFILES += site.exp development.exp
 endif
 
-if BUILD_INFO
 include doc/local.mk
-endif
diff --git a/libctf/Makefile.in b/libctf/Makefile.in
index 379f50df44b..2b74bf2855e 100644
--- a/libctf/Makefile.in
+++ b/libctf/Makefile.in
@@ -1023,24 +1023,24 @@ doc/$(am__dirstamp):
 	@$(MKDIR_P) doc
 	@: > doc/$(am__dirstamp)
 
-doc/ctf-spec.info: doc/ctf-spec.texi 
-	@test -f doc/$(am__dirstamp) || $(MAKE) $(AM_MAKEFLAGS) doc/$(am__dirstamp)
-	$(AM_V_MAKEINFO)restore=: && backupdir="$(am__leading_dot)am$$$$" && \
-	rm -rf $$backupdir && mkdir $$backupdir && \
-	if ($(MAKEINFO) --version) >/dev/null 2>&1; then \
-	  for f in $@ $@-[0-9] $@-[0-9][0-9] $(@:.info=).i[0-9] $(@:.info=).i[0-9][0-9]; do \
-	    if test -f $$f; then mv $$f $$backupdir; restore=mv; else :; fi; \
-	  done; \
-	else :; fi && \
-	if $(MAKEINFO) $(AM_MAKEINFOFLAGS) $(MAKEINFOFLAGS) -I doc -I $(srcdir)/doc \
-	 -o $@ `test -f 'doc/ctf-spec.texi' || echo '$(srcdir)/'`doc/ctf-spec.texi; \
-	then \
-	  rc=0; \
-	else \
-	  rc=$$?; \
-	  $$restore $$backupdir/* `echo "./$@" | sed 's|[^/]*$$||'`; \
-	fi; \
-	rm -rf $$backupdir; exit $$rc
+@BUILD_INFO_TRUE@doc/ctf-spec.info: doc/ctf-spec.texi 
+@BUILD_INFO_TRUE@	@test -f doc/$(am__dirstamp) || $(MAKE) $(AM_MAKEFLAGS) doc/$(am__dirstamp)
+@BUILD_INFO_TRUE@	$(AM_V_MAKEINFO)restore=: && backupdir="$(am__leading_dot)am$$$$" && \
+@BUILD_INFO_TRUE@	rm -rf $$backupdir && mkdir $$backupdir && \
+@BUILD_INFO_TRUE@	if ($(MAKEINFO) --version) >/dev/null 2>&1; then \
+@BUILD_INFO_TRUE@	  for f in $@ $@-[0-9] $@-[0-9][0-9] $(@:.info=).i[0-9] $(@:.info=).i[0-9][0-9]; do \
+@BUILD_INFO_TRUE@	    if test -f $$f; then mv $$f $$backupdir; restore=mv; else :; fi; \
+@BUILD_INFO_TRUE@	  done; \
+@BUILD_INFO_TRUE@	else :; fi && \
+@BUILD_INFO_TRUE@	if $(MAKEINFO) $(AM_MAKEINFOFLAGS) $(MAKEINFOFLAGS) -I doc -I $(srcdir)/doc \
+@BUILD_INFO_TRUE@	 -o $@ `test -f 'doc/ctf-spec.texi' || echo '$(srcdir)/'`doc/ctf-spec.texi; \
+@BUILD_INFO_TRUE@	then \
+@BUILD_INFO_TRUE@	  rc=0; \
+@BUILD_INFO_TRUE@	else \
+@BUILD_INFO_TRUE@	  rc=$$?; \
+@BUILD_INFO_TRUE@	  $$restore $$backupdir/* `echo "./$@" | sed 's|[^/]*$$||'`; \
+@BUILD_INFO_TRUE@	fi; \
+@BUILD_INFO_TRUE@	rm -rf $$backupdir; exit $$rc
 
 doc/ctf-spec.dvi: doc/ctf-spec.texi  doc/$(am__dirstamp)
 	$(AM_V_TEXI2DVI)TEXINPUTS="$(am__TEXINFO_TEX_DIR)$(PATH_SEPARATOR)$$TEXINPUTS" \
@@ -1709,6 +1709,10 @@ uninstall-am: uninstall-dvi-am uninstall-html-am \
 @BUILD_INFO_TRUE@	$(AM_V_GEN)$(MAKEINFOHTML) $(AM_MAKEINFOHTMLFLAGS) $(MAKEINFOFLAGS) \
 @BUILD_INFO_TRUE@	  --split=node -I$(srcdir) --output doc/ctf-spec $(srcdir)/doc/ctf-spec.texi
 
+# Workaround bug in automake: it can't handle conditionally building info pages
+# since GNU projects normally include info pages in the source distributions.
+@BUILD_INFO_FALSE@doc/ctf-spec.info:
+
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT:
diff --git a/libctf/doc/local.mk b/libctf/doc/local.mk
index 7ee2fec78cc..e533d72227d 100644
--- a/libctf/doc/local.mk
+++ b/libctf/doc/local.mk
@@ -17,6 +17,8 @@
 # <http://www.gnu.org/licenses/>.
 #
 
+if BUILD_INFO
+
 info_TEXINFOS += %D%/ctf-spec.texi
 libctf_TEXINFOS = $(info_TEXINFOS)
 
@@ -29,3 +31,11 @@ html-local: %D%/ctf-spec/index.html
 %D%/ctf-spec/index.html: %D%/ctf-spec.texi %D%/$(am__dirstamp)
 	$(AM_V_GEN)$(MAKEINFOHTML) $(AM_MAKEINFOHTMLFLAGS) $(MAKEINFOFLAGS) \
 	  --split=node -I$(srcdir) --output %D%/ctf-spec $(srcdir)/%D%/ctf-spec.texi
+
+else
+
+# Workaround bug in automake: it can't handle conditionally building info pages
+# since GNU projects normally include info pages in the source distributions.
+%D%/ctf-spec.info:
+
+endif