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