172 lines
5.5 KiB
Diff
172 lines
5.5 KiB
Diff
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Patch taken from nix.
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commit fdda59736ddc048cf38a2c7103f4f5d9eeaf995e
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Author: Ben Gamari <ben@smart-cactus.org>
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Date: Tue Oct 17 10:51:34 2017 -0400
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Try implementing cross-compilation
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diff --git a/bc/Makefile.am b/bc/Makefile.am
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index d9d412e..fdef633 100644
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--- a/bc/Makefile.am
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+++ b/bc/Makefile.am
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@@ -17,6 +17,7 @@ MAINTAINERCLEANFILES = Makefile.in bc.c bc.h scan.c \
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AM_CPPFLAGS = -I$(srcdir) -I$(srcdir)/../h
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LIBBC = ../lib/libbc.a
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+LIBBC_HOST = ../lib/libbc_host.a
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LIBL = @LEXLIB@
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LDADD = $(LIBBC) $(LIBL) @READLINELIB@
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@@ -29,12 +30,20 @@ $(PROGRAMS): libmath.h $(LIBBC)
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scan.o: bc.h
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global.o: libmath.h
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+
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+main_host.c : main.c
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+ cp $< $@
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-fbcOBJ = main.o bc.o scan.o execute.o load.o storage.o util.o warranty.o
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+fbcOBJ = $(addsuffix _host,main.o bc.o scan.o execute.o load.o storage.o util.o warranty.o)
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+
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+%.o_host : CC:=$(CC_FOR_BUILD)
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+
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+%.o_host : %.c
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+ $(COMPILE) -c $(CFLAGS) $(INCLUDES) -o $@ $<
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-libmath.h: libmath.b $(fbcOBJ) $(LIBBC)
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+libmath.h: libmath.b $(fbcOBJ) $(LIBBC_HOST)
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echo '{0}' > libmath.h
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- $(MAKE) global.o
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- $(LINK) -o fbc $(fbcOBJ) global.o $(LIBBC) $(LIBL) $(READLINELIB) $(LIBS)
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+ $(MAKE) global.o_host
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+ $(CC_FOR_BUILD) -o fbc $(fbcOBJ) global.o_host $(LIBBC_HOST) $(LIBL) ${READLINELIB} $(LIBS)
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./fbc -c $(srcdir)/libmath.b </dev/null >libmath.h
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$(srcdir)/fix-libmath_h
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rm -f ./fbc ./global.o
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diff --git a/configure.ac b/configure.ac
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index fc74573..5cabb73 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -20,6 +20,7 @@ m4_define([dc_version], 1.4.1)
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AC_INIT([bc],[bc_version])
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AC_CONFIG_SRCDIR(doc/bc.1)
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+AC_CONFIG_MACRO_DIR([m4])
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AM_INIT_AUTOMAKE([dist-bzip2])
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AC_CONFIG_HEADERS(config.h)
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@@ -35,6 +36,7 @@ AC_DEFINE([DC_COPYRIGHT],
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[Define the dc copyright line.])
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AC_PROG_CC
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+AX_CC_FOR_BUILD
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AC_USE_SYSTEM_EXTENSIONS
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AM_PROG_LEX
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diff --git a/lib/Makefile.am b/lib/Makefile.am
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index ec4bf59..c670f5b 100644
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--- a/lib/Makefile.am
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+++ b/lib/Makefile.am
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@@ -1,5 +1,5 @@
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## Process this file with automake to produce Makefile.in
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-noinst_LIBRARIES = libbc.a
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+noinst_LIBRARIES = libbc.a libbc_host.a
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AM_CPPFLAGS = -I. -I.. -I$(srcdir)/../h
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@@ -24,3 +24,11 @@ testmul: testmul.o number.o
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specialnumber: newnumber.o
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cp newnumber.o number.o
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+
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+%.o_host : CC:=$(CC_FOR_BUILD)
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+%.o_host : %.c
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+ $(COMPILE) -c $(CFLAGS) $(INCLUDES) -o $@ $<
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+
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+libbc_host.a : $(addsuffix _host,$(libbc_a_OBJECTS))
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+ ar cru $@ $+
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+ ranlib $@
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diff --git a/m4/cc_for_build.m4 b/m4/cc_for_build.m4
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new file mode 100644
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index 0000000..c62ffad
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--- /dev/null
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+++ b/m4/cc_for_build.m4
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@@ -0,0 +1,77 @@
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+# ===========================================================================
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+# https://www.gnu.org/software/autoconf-archive/ax_cc_for_build.html
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+# ===========================================================================
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+#
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+# SYNOPSIS
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+#
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+# AX_CC_FOR_BUILD
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+#
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+# DESCRIPTION
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+#
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+# Find a build-time compiler. Sets CC_FOR_BUILD and EXEEXT_FOR_BUILD.
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+#
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+# LICENSE
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+#
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+# Copyright (c) 2010 Reuben Thomas <rrt@sc3d.org>
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+# Copyright (c) 1999 Richard Henderson <rth@redhat.com>
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+#
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+# This program is free software: you can redistribute it and/or modify it
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+# under the terms of the GNU General Public License as published by the
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+# Free Software Foundation, either version 3 of the License, or (at your
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+# option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful, but
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+# WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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+# Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License along
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+# with this program. If not, see <https://www.gnu.org/licenses/>.
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+#
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+# As a special exception, the respective Autoconf Macro's copyright owner
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+# gives unlimited permission to copy, distribute and modify the configure
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+# scripts that are the output of Autoconf when processing the Macro. You
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+# need not follow the terms of the GNU General Public License when using
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+# or distributing such scripts, even though portions of the text of the
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+# Macro appear in them. The GNU General Public License (GPL) does govern
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+# all other use of the material that constitutes the Autoconf Macro.
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+#
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+# This special exception to the GPL applies to versions of the Autoconf
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+# Macro released by the Autoconf Archive. When you make and distribute a
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+# modified version of the Autoconf Macro, you may extend this special
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+# exception to the GPL to apply to your modified version as well.
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+
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+#serial 3
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+
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+dnl Get a default for CC_FOR_BUILD to put into Makefile.
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+AC_DEFUN([AX_CC_FOR_BUILD],
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+[# Put a plausible default for CC_FOR_BUILD in Makefile.
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+if test -z "$CC_FOR_BUILD"; then
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+ if test "x$cross_compiling" = "xno"; then
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+ CC_FOR_BUILD='$(CC)'
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+ else
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+ CC_FOR_BUILD=gcc
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+ fi
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+fi
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+AC_SUBST(CC_FOR_BUILD)
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+# Also set EXEEXT_FOR_BUILD.
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+if test "x$cross_compiling" = "xno"; then
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+ EXEEXT_FOR_BUILD='$(EXEEXT)'
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+else
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+ AC_CACHE_CHECK([for build system executable suffix], bfd_cv_build_exeext,
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+ [rm -f conftest*
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+ echo 'int main () { return 0; }' > conftest.c
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+ bfd_cv_build_exeext=
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+ ${CC_FOR_BUILD} -o conftest conftest.c 1>&5 2>&5
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+ for file in conftest.*; do
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+ case $file in
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+ *.c | *.o | *.obj | *.ilk | *.pdb) ;;
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+ *) bfd_cv_build_exeext=`echo $file | sed -e s/conftest//` ;;
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+ esac
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+ done
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+ rm -f conftest*
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+ test x"${bfd_cv_build_exeext}" = x && bfd_cv_build_exeext=no])
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+ EXEEXT_FOR_BUILD=""
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+ test x"${bfd_cv_build_exeext}" != xno && EXEEXT_FOR_BUILD=${bfd_cv_build_exeext}
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+fi
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+AC_SUBST(EXEEXT_FOR_BUILD)])dnl
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