Lars, I thought I'd try and get to the bottom of this pch.h stuff.
Here's what happens now if I have separate build and source trees:
$ cd lyx/devel/build/src/tex2lyx
$ rm -f ~/lyx/devel/src/tex2lyx/pch.h.gch
$ make
make PCH_FLAGS= pch-file
make[1]: Entering directory `/home/angus/lyx/devel/build/src/tex2lyx'
g++ -DHAVE_CONFIG_H -I. -I../../../src/tex2lyx -I../../src
-I../../../src/tex2lyx/.. -I../../../boost -Wextra -Wall
-I/usr/X11R6/include -g -O -fno-exceptions -x
c++-header ../../../src/tex2lyx/pch.h -MT ./pch.h.gch -MD -MP \
-MF "././pch.h.gch.Tdep" \
&& mv "././pch.h.gch.Tdep" "././pch.h.gch.dep" || rm "././pch.h.gch.Tdep"
make[1]: Leaving directory `/home/angus/lyx/devel/build/src/tex2lyx'
make all-am
make[1]: Entering directory `/home/angus/lyx/devel/build/src/tex2lyx'
make[1]: Leaving directory `/home/angus/lyx/devel/build/src/tex2lyx'
$ ls -a
. Floating.C lyxfont.o lyxlex_pimpl.o preamble.o
.. Floating.o lyxlayout.C lyxtextclass.C table.o
boost.o FloatList.C lyxlayout.h lyxtextclass.h tex2lyx
context.o FloatList.o lyxlayout.o lyxtextclass.o tex2lyx.o
counters.C gettext.o lyxlex.C Makefile texparser.o
counters.o lengthcommon.o lyxlex.o math.o text.o
.deps .libs lyxlex_pimpl.C pch.h.gch.dep
$ ls -a .deps
. counters.Po lengthcommon.Po lyxlex.Po table.Po
.. Floating.Po lyxfont.Po lyxtextclass.Po tex2lyx.Po
boost.Po FloatList.Po lyxlayout.Po math.Po texparser.Po
context.Po gettext.Po lyxlex_pimpl.Po preamble.Po text.Po
$ ls -a ~/lyx/devel/src/tex2lyx
. CVS lyxfont.h preamble.C tex2lyx.h
.. .cvsignore Makefile.am Spacing.h texparser.C
boost.C gettext.C Makefile.in table.C texparser.h
ChangeLog gettext.h math.C test-insets.tex text.C
context.C lengthcommon.C pch.h test-structure.tex
context.h lyxfont.C pch.h.gch tex2lyx.C
The thing to note about all this is that you specify the "make target", -MT
correctly as "./pch.h.gch", but you don't actually tell the compiler to
generate this file, so it outputs it in the source directory, not the
build directory.
However, I find that explicitly passing "-o ./pch.h.gch" to the compiler
does work:
$ rm -f ~/lyx/devel/src/tex2lyx/pch.h.gch
$ g++ -DHAVE_CONFIG_H -I. -I../../../src/tex2lyx -I../../src
-I../../../src/tex2lyx/.. -I../../../boost -Wextra -Wall
-I/usr/X11R6/include -g -O -fno-exceptions -x
c++-header ../../../src/tex2lyx/pch.h -o ./pch.h.gch -MT ./pch.h.gch -MD
-MP -MF "././pch.h.gch.Tdep" && mv "././pch.h.gch.Tdep"
"././pch.h.gch.dep" || rm "././pch.h.gch.Tdep"
mv: overwrite `././pch.h.gch.dep'? y
$ ls -a
. Floating.C lyxfont.o lyxlex_pimpl.o pch.h.gch.dep
.. Floating.o lyxlayout.C lyxtextclass.C preamble.o
boost.o FloatList.C lyxlayout.h lyxtextclass.h table.o
context.o FloatList.o lyxlayout.o lyxtextclass.o tex2lyx
counters.C gettext.o lyxlex.C Makefile tex2lyx.o
counters.o lengthcommon.o lyxlex.o math.o texparser.o
.deps .libs lyxlex_pimpl.C pch.h.gch text.o
$ ls -a ~/lyx/devel/src/tex2lyx
. CVS lyxfont.h Spacing.h texparser.C
.. .cvsignore Makefile.am table.C texparser.h
boost.C gettext.C Makefile.in test-insets.tex text.C
ChangeLog gettext.h math.C test-structure.tex
context.C lengthcommon.C pch.h tex2lyx.C
context.h lyxfont.C preamble.C tex2lyx.h
I'm off to bed now, but it seems that we could make progress by changing
config/common.am to explicitly define the output file, no?
Now that the .pch.h.gch file is in the build directory, I find that
compilation of an 'ordinary' file still succeeds:
$ rm -f math.o
$ if g++ -DHAVE_CONFIG_H -I. -I../../../src/tex2lyx -I../../src
-Winvalid-pch --include=../../../src/tex2lyx/pch.h
-I../../../src/tex2lyx/.. -I../../../boost -Wextra -Wall
-I/usr/X11R6/include -g -O -fno-exceptions -MT math.o -MD -MP -MF
".deps/math.Tpo" -c -o math.o ../../../src/tex2lyx/math.C; then echo
success; else echo failure; fi
success
Ie, the compiler is finding the pch.h.gch file in the build directory not
in the source directory. Or do I miss something?
--
Angus
