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stdckdint-h: Don't generate header if it is not needed.
Suggested by Paul Eggert in: <https://lists.gnu.org/archive/html/bug-gnulib/2025-05/msg00216.html>. * m4/stdckdint_h.m4: New file. * modules/stdckdint-h (Files): Add m4/stdckdint_h.m4. (configure.ac): Remove checks and just invoke gl_STDCKDINT_H. (Makefile.am): Replace variables set by ./configure. * lib/stdckdint.in.h: Include the compilers header if it exists. Add comment mentioning expected future standardization in C++26. (ckd_add, ckd_sub, ckd_mul): Only define if the compilers definitions do not work.
This commit is contained in:
Collin Funk
14
ChangeLog
14
ChangeLog
@@ -1,3 +1,17 @@
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2025-05-22 Collin Funk <collin.funk1@gmail.com>
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stdckdint-h: Don't generate header if it is not needed.
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Suggested by Paul Eggert in:
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<https://lists.gnu.org/archive/html/bug-gnulib/2025-05/msg00216.html>.
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* m4/stdckdint_h.m4: New file.
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* modules/stdckdint-h (Files): Add m4/stdckdint_h.m4.
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(configure.ac): Remove checks and just invoke gl_STDCKDINT_H.
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(Makefile.am): Replace variables set by ./configure.
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* lib/stdckdint.in.h: Include the compilers header if it exists. Add
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comment mentioning expected future standardization in C++26.
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(ckd_add, ckd_sub, ckd_mul): Only define if the compilers definitions do
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not work.
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2025-05-22 Bruno Haible <bruno@clisp.org>
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strchrnul: Update doc.
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@@ -15,10 +15,30 @@
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef _GL_STDCKDINT_H
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#define _GL_STDCKDINT_H
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#if __GNUC__ >= 3
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@PRAGMA_SYSTEM_HEADER@
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#endif
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@PRAGMA_COLUMNS@
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#include "intprops-internal.h"
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#ifndef _@GUARD_PREFIX@_STDCKDINT_H
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/* The include_next requires a split double-inclusion guard. */
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#if defined __cplusplus ? @HAVE_CXX_STDCKDINT_H@ : @HAVE_C_STDCKDINT_H@
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# @INCLUDE_NEXT@ @NEXT_STDCKDINT_H@
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#endif
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#ifndef _@GUARD_PREFIX@_STDCKDINT_H
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#define _@GUARD_PREFIX@_STDCKDINT_H
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/* Do nothing but include the system header if it works properly. */
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# if defined __cplusplus ? !@HAVE_WORKING_CXX_STDCKDINT_H@ : !@HAVE_WORKING_C_STDCKDINT_H@
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/* Avoid redefining macros. */
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# undef ckd_add
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# undef ckd_sub
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# undef ckd_mul
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# include "intprops-internal.h"
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/* Store into *R the low-order bits of A + B, A - B, A * B, respectively.
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Return 1 if the result overflows, 0 otherwise.
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@@ -26,10 +46,13 @@
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bit-precise integer type, or an enumeration type.
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These are like the standard macros introduced in C23, except that
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arguments should not have side effects. */
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arguments should not have side effects. The C++26 standard is
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expected to add this header and it's macros. */
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#define ckd_add(r, a, b) ((bool) _GL_INT_ADD_WRAPV (a, b, r))
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#define ckd_sub(r, a, b) ((bool) _GL_INT_SUBTRACT_WRAPV (a, b, r))
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#define ckd_mul(r, a, b) ((bool) _GL_INT_MULTIPLY_WRAPV (a, b, r))
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# define ckd_add(r, a, b) ((bool) _GL_INT_ADD_WRAPV (a, b, r))
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# define ckd_sub(r, a, b) ((bool) _GL_INT_SUBTRACT_WRAPV (a, b, r))
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# define ckd_mul(r, a, b) ((bool) _GL_INT_MULTIPLY_WRAPV (a, b, r))
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#endif /* _GL_STDCKDINT_H */
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# endif /* defined __cplusplus ? @HAVE_WORKING_CXX_STDCKDINT_H@ : @HAVE_WORKING_C_STDCKDINT_H@ */
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#endif /* _@GUARD_PREFIX@_STDCKDINT_H */
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#endif /* _@GUARD_PREFIX@_STDCKDINT_H */
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136
m4/stdckdint_h.m4
Normal file
136
m4/stdckdint_h.m4
Normal file
@@ -0,0 +1,136 @@
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# stdckdint_h.m4
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# serial 1
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dnl Copyright 2025 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl This file is offered as-is, without any warranty.
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dnl Written by Collin Funk.
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AC_DEFUN_ONCE([gl_STDCKDINT_H],
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[
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gl_CHECK_NEXT_HEADERS([stdckdint.h])
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if test $ac_cv_header_stdckdint_h = yes; then
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HAVE_STDCKDINT_H=1
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else
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HAVE_STDCKDINT_H=0
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fi
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AC_SUBST([HAVE_STDCKDINT_H])
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if test $HAVE_STDCKDINT_H = 1; then
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AC_CACHE_CHECK([whether stdckdint.h can be included in C],
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[gl_cv_header_c_stdckdint_h],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <stdckdint.h>
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]])],
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[gl_cv_header_c_stdckdint_h=yes],
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[gl_cv_header_c_stdckdint_h=no])])
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if test $gl_cv_header_c_stdckdint_h = yes; then
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HAVE_C_STDCKDINT_H=1
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AC_CACHE_CHECK([checking for an ISO C23 compliant stdckdint.h in C],
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[gl_cv_header_c_stdckdint_h_works],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <stdckdint.h>
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]],
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[[int r;
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int a = 1;
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int b = 1;
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return !!(ckd_add (&r, a, b) || ckd_sub (&r, a, b)
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|| ckd_mul (&r, a, b));
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]])],
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[gl_cv_header_c_stdckdint_h_works=yes],
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[gl_cv_header_c_stdckdint_h_works=no])])
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if test $gl_cv_header_c_stdckdint_h_works = yes; then
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HAVE_WORKING_C_STDCKDINT_H=1
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else
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HAVE_WORKING_C_STDCKDINT_H=0
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fi
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else
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HAVE_C_STDCKDINT_H=0
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HAVE_WORKING_C_STDCKDINT_H=0
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fi
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if test "$CXX" != no; then
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AC_CACHE_CHECK([whether stdckdint.h can be included in C++],
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[gl_cv_header_cxx_stdckdint_h],
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[dnl We can't use AC_LANG_PUSH([C++]) and AC_LANG_POP([C++]) here, due to
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dnl an autoconf bug <https://savannah.gnu.org/support/?110294>.
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cat > conftest.cpp <<\EOF
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#include <stdckdint.h>
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EOF
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gl_command="$CXX $CXXFLAGS $CPPFLAGS -c conftest.cpp"
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if AC_TRY_EVAL([gl_command]); then
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gl_cv_header_cxx_stdckdint_h=yes
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else
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gl_cv_header_cxx_stdckdint_h=no
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fi
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rm -fr conftest*
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])
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if test $gl_cv_header_cxx_stdckdint_h = yes; then
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HAVE_CXX_STDCKDINT_H=1
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AC_CACHE_CHECK([checking for an ISO C++26 compliant stdckdint.h in C++],
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[gl_cv_header_cxx_stdckdint_h_works],
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[dnl We can't use AC_LANG_PUSH([C++]) and AC_LANG_POP([C++]) here, due to
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dnl an autoconf bug <https://savannah.gnu.org/support/?110294>.
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cat > conftest.cpp <<\EOF
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#include <stdckdint.h>
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int
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main (void)
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{
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int r;
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int a = 1;
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int b = 1;
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return !!(ckd_add (&r, a, b) || ckd_sub (&r, a, b) || ckd_mul (&r, a, b));
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}
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EOF
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gl_command="$CXX $CXXFLAGS $CPPFLAGS -c conftest.cpp"
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if AC_TRY_EVAL([gl_command]); then
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gl_cv_header_cxx_stdckdint_h_works=yes
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else
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gl_cv_header_cxx_stdckdint_h_works=no
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fi
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rm -fr conftest*
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])
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if test $gl_cv_header_cxx_stdckdint_h_works = yes; then
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HAVE_WORKING_CXX_STDCKDINT_H=1
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else
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HAVE_WORKING_CXX_STDCKDINT_H=0
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fi
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else
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HAVE_CXX_STDCKDINT_H=0
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HAVE_WORKING_CXX_STDCKDINT_H=0
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fi
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fi
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else
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HAVE_C_STDCKDINT_H=0
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HAVE_WORKING_C_STDCKDINT_H=0
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HAVE_CXX_STDCKDINT_H=0
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HAVE_WORKING_CXX_STDCKDINT_H=0
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fi
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AC_SUBST([HAVE_C_STDCKDINT_H])
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AC_SUBST([HAVE_WORKING_C_STDCKDINT_H])
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AC_SUBST([HAVE_CXX_STDCKDINT_H])
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AC_SUBST([HAVE_WORKING_CXX_STDCKDINT_H])
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if test "$CXX" != no; then
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dnl We might need the header for C or C++.
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if test $HAVE_C_STDCKDINT_H = 1 \
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&& test $HAVE_WORKING_C_STDCKDINT_H = 1 \
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&& test $HAVE_CXX_STDCKDINT_H = 1 \
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&& test $HAVE_WORKING_CXX_STDCKDINT_H = 1; then
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GL_GENERATE_STDCKDINT_H=false
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else
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GL_GENERATE_STDCKDINT_H=true
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fi
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else
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dnl We don't care about C++ here.
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if test $HAVE_C_STDCKDINT_H = 1 \
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&& test $HAVE_WORKING_C_STDCKDINT_H = 1; then
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GL_GENERATE_STDCKDINT_H=false
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else
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GL_GENERATE_STDCKDINT_H=true
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fi
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fi
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])
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@@ -2,6 +2,7 @@ Description:
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An <stdckdint.h> that is like C23.
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Files:
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m4/stdckdint_h.m4
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lib/stdckdint.in.h
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lib/intprops-internal.h
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@@ -10,16 +11,7 @@ gen-header
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bool
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configure.ac:
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AC_CHECK_HEADERS_ONCE([stdckdint.h])
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if test $ac_cv_header_stdckdint_h = yes; then
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if test -n "$CXX" && test "$CXX" != no; then
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GL_GENERATE_STDCKDINT_H=true
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else
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GL_GENERATE_STDCKDINT_H=false
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fi
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else
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GL_GENERATE_STDCKDINT_H=true
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fi
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gl_STDCKDINT_H
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gl_CONDITIONAL_HEADER([stdckdint.h])
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AC_PROG_MKDIR_P
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@@ -32,6 +24,15 @@ if GL_GENERATE_STDCKDINT_H
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stdckdint.h: stdckdint.in.h $(top_builddir)/config.status
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@NMD@ $(AM_V_GEN)$(MKDIR_P) '%reldir%'
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$(gl_V_at)$(SED_HEADER_STDOUT) \
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-e 's|@''GUARD_PREFIX''@|${gl_include_guard_prefix}|g' \
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-e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
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-e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
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-e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
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-e 's|@''NEXT_STDCKDINT_H''@|$(NEXT_STDCKDINT_H)|g' \
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-e 's|@''HAVE_C_STDCKDINT_H''@|$(HAVE_C_STDCKDINT_H)|g' \
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-e 's|@''HAVE_WORKING_C_STDCKDINT_H''@|$(HAVE_WORKING_C_STDCKDINT_H)|g' \
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-e 's|@''HAVE_CXX_STDCKDINT_H''@|$(HAVE_CXX_STDCKDINT_H)|g' \
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-e 's|@''HAVE_WORKING_CXX_STDCKDINT_H''@|$(HAVE_WORKING_CXX_STDCKDINT_H)|g' \
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$(srcdir)/stdckdint.in.h > $@-t
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$(AM_V_at)mv $@-t $@
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else
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