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Re: (no) GCC pre-compiled headers on Cygwin
- From: Alexandre Oliva <aoliva at redhat dot com>
- To: Benjamin Kosnik <bkoz at redhat dot com>
- Cc: gcc at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org, libstdc++ at gcc dot gnu dot org
- Date: 23 Jul 2003 02:14:09 -0300
- Subject: Re: (no) GCC pre-compiled headers on Cygwin
- Organization: GCC Team, Red Hat
- References: <20030722102833.60471912.bkoz@redhat.com>
On Jul 22, 2003, Benjamin Kosnik <bkoz@redhat.com> wrote:
>> Would a change that made it fail in the current conditions be acceptable
>> for libstdc++?
> Yes please.
How's this? Ok to install?
Index: libstdc++-v3/ChangeLog
from Alexandre Oliva <aoliva@redhat.com>
* acinclude.m4 (GLIBCXX_ENABLE_PCH): Rework test such that it
tests not only generation of pch files, but also their use.
* aclocal.m4, configure: Rebuilt.
Index: libstdc++-v3/acinclude.m4
===================================================================
RCS file: /cvs/gcc/gcc/libstdc++-v3/acinclude.m4,v
retrieving revision 1.257
diff -u -p -r1.257 acinclude.m4
--- libstdc++-v3/acinclude.m4 14 Jul 2003 18:23:00 -0000 1.257
+++ libstdc++-v3/acinclude.m4 23 Jul 2003 05:05:06 -0000
@@ -1394,7 +1394,7 @@ AC_ARG_ENABLE(libstdcxx_pch,
changequote(<<, >>)dnl
<< --enable-libstdcxx-pch build pre-compiled libstdc++ includes [default=>>GLIBCXX_ENABLE_PCH_DEFAULT],
changequote([, ])dnl
-[case "${enableval}" in
+[case ${enableval} in
yes) enable_libstdcxx_pch=yes ;;
no) enable_libstdcxx_pch=no ;;
*) AC_MSG_ERROR([Unknown argument to enable/disable PCH]) ;;
@@ -1402,27 +1402,30 @@ changequote([, ])dnl
enable_libstdcxx_pch=GLIBCXX_ENABLE_PCH_DEFAULT)dnl
if test x$enable_libstdcxx_pch = xyes; then
- ac_test_CXXFLAGS="${CXXFLAGS+set}"
- ac_save_CXXFLAGS="$CXXFLAGS"
- CXXFLAGS='-Werror -Winvalid-pch -Wno-deprecated -x c++-header'
-
- AC_MSG_CHECKING([for compiler that seems to compile .gch files])
- if test x${pch_comp+set} != xset; then
- AC_CACHE_VAL(pch_comp, [
+ AC_CACHE_CHECK([for pch support], [libstdcxx_cv_pch_comp],[
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
- AC_TRY_COMPILE([#include <math.h>], ,
- [pch_comp=yes], [pch_comp=no])
+ ac_save_CXXFLAGS=$CXXFLAGS
+ CXXFLAGS="$CXXFLAGS -Werror -Winvalid-pch -Wno-deprecated"
+ echo '#include <math.h>' > conftest.h
+ if ${CXX-g++} $CXXFLAGS $CPPFLAGS -x c++-header conftest.h \
+ -o conftest.h.gch 1>&5 2>&1 &&
+ echo '#error "pch failed"' > conftest.h &&
+ echo '#include "conftest.h"' > conftest.C &&
+ ${CXX-g++} -c $CXXFLAGS $CPPFLAGS conftest.C 1>&5 2>&1 ; then
+ libstdcxx_cv_pch_comp=yes
+ else
+ libstdcxx_cv_pch_comp=no
+ fi
+ rm -f conftest*
+ CXXFLAGS=$ac_save_CXXFLAGS
AC_LANG_RESTORE
- ])
- fi
- AC_MSG_RESULT([$pch_comp])
-
- CXXFLAGS="$ac_save_CXXFLAGS"
+ ])
fi
- if test x"$enable_libstdcxx_pch" = xyes && test x"$pch_comp" = xno; then
- enable_pch=no
+ if test x"$enable_libstdcxx_pch" = xyes &&
+ test x"$libstdcxx_cv_pch_comp" = xno; then
+ enable_libstdcxx_pch=no
fi
AC_MSG_CHECKING([for enabled PCH])
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist Professional serial bug killer