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dnl
dnl Compiler stuff for CUPS.
dnl
dnl Copyright 2007-2018 by Apple Inc.
dnl Copyright 1997-2007 by Easy Software Products, all rights reserved.
dnl
dnl Licensed under Apache License v2.0. See the file "LICENSE" for more information.
dnl
dnl Clear the debugging and non-shared library options unless the user asks
dnl for them...
INSTALL_STRIP=""
AC_SUBST(INSTALL_STRIP)
AC_ARG_WITH(optim, [ --with-optim set optimization flags ],
OPTIM="$withval",
OPTIM="")
AC_SUBST(OPTIM)
AC_ARG_ENABLE(debug, [ --enable-debug build with debugging symbols])
AC_ARG_ENABLE(debug_guards, [ --enable-debug-guards build with memory allocation guards])
AC_ARG_ENABLE(debug_printfs, [ --enable-debug-printfs build with CUPS_DEBUG_LOG support])
AC_ARG_ENABLE(unit_tests, [ --enable-unit-tests build and run unit tests])
dnl For debugging, keep symbols, otherwise strip them...
if test x$enable_debug = xyes -a "x$OPTIM" = x; then
OPTIM="-g"
else
INSTALL_STRIP="-s"
fi
dnl Debug printfs can slow things down, so provide a separate option for that
if test x$enable_debug_printfs = xyes; then
CFLAGS="$CFLAGS -DDEBUG"
CXXFLAGS="$CXXFLAGS -DDEBUG"
fi
dnl Debug guards use an extra 4 bytes for some structures like strings in the
dnl string pool, so provide a separate option for that
if test x$enable_debug_guards = xyes; then
CFLAGS="$CFLAGS -DDEBUG_GUARDS"
CXXFLAGS="$CXXFLAGS -DDEBUG_GUARDS"
fi
dnl Unit tests take up time during a compile...
if test x$enable_unit_tests = xyes; then
if test "$build" != "$host"; then
AC_MSG_ERROR([Sorry, cannot build unit tests when cross-compiling.])
fi
UNITTESTS="unittests"
else
UNITTESTS=""
fi
AC_SUBST(UNITTESTS)
dnl Setup general architecture flags...
AC_ARG_WITH(archflags, [ --with-archflags set default architecture flags ])
AC_ARG_WITH(ldarchflags, [ --with-ldarchflags set program architecture flags ])
if test -z "$with_archflags"; then
ARCHFLAGS=""
else
ARCHFLAGS="$with_archflags"
fi
if test -z "$with_ldarchflags"; then
if test "$host_os_name" = darwin; then
# Only create Intel programs by default
LDARCHFLAGS="`echo $ARCHFLAGS | sed -e '1,$s/-arch ppc64//'`"
else
LDARCHFLAGS="$ARCHFLAGS"
fi
else
LDARCHFLAGS="$with_ldarchflags"
fi
AC_SUBST(ARCHFLAGS)
AC_SUBST(LDARCHFLAGS)
dnl Read-only data/program support on Linux...
AC_ARG_ENABLE(relro, [ --enable-relro build with the GCC relro option])
dnl Clang/GCC address sanitizer...
AC_ARG_ENABLE(sanitizer, [ --enable-sanitizer build with AddressSanitizer])
dnl Update compiler options...
CXXLIBS="${CXXLIBS:=}"
AC_SUBST(CXXLIBS)
PIEFLAGS=""
AC_SUBST(PIEFLAGS)
RELROFLAGS=""
AC_SUBST(RELROFLAGS)
WARNING_OPTIONS=""
AC_SUBST(WARNING_OPTIONS)
if test -n "$GCC"; then
# Add GCC-specific compiler options...
# Address sanitizer is a useful tool to use when developing/debugging
# code but adds about 2x overhead...
if test x$enable_sanitizer = xyes; then
# Use -fsanitize=address with debugging...
OPTIM="$OPTIM -g -fsanitize=address"
else
# Otherwise use the Fortify enhancements to catch any unbounded
# string operations...
CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"
CXXFLAGS="$CXXFLAGS -D_FORTIFY_SOURCE=2"
fi
# Default optimization options...
if test -z "$OPTIM"; then
# Default to optimize-for-size and debug
OPTIM="-Os -g"
fi
# Generate position-independent code as needed...
if test $PICFLAG = 1; then
OPTIM="-fPIC $OPTIM"
fi
# The -fstack-protector option is available with some versions of
# GCC and adds "stack canaries" which detect when the return address
# has been overwritten, preventing many types of exploit attacks.
AC_MSG_CHECKING(whether compiler supports -fstack-protector)
OLDCFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fstack-protector"
AC_TRY_LINK(,,
if test "x$LSB_BUILD" = xy; then
# Can't use stack-protector with LSB binaries...
OPTIM="$OPTIM -fno-stack-protector"
else
OPTIM="$OPTIM -fstack-protector"
fi
AC_MSG_RESULT(yes),
AC_MSG_RESULT(no))
CFLAGS="$OLDCFLAGS"
if test "x$LSB_BUILD" != xy; then
# The -fPIE option is available with some versions of GCC and
# adds randomization of addresses, which avoids another class of
# exploits that depend on a fixed address for common functions.
#
# Not available to LSB binaries...
AC_MSG_CHECKING(whether compiler supports -fPIE)
OLDCFLAGS="$CFLAGS"
case "$host_os_name" in
darwin*)
CFLAGS="$CFLAGS -fPIE -Wl,-pie"
AC_TRY_COMPILE(,,[
PIEFLAGS="-fPIE -Wl,-pie"
AC_MSG_RESULT(yes)],
AC_MSG_RESULT(no))
;;
*)
CFLAGS="$CFLAGS -fPIE -pie"
AC_TRY_COMPILE(,,[
PIEFLAGS="-fPIE -pie"
AC_MSG_RESULT(yes)],
AC_MSG_RESULT(no))
;;
esac
CFLAGS="$OLDCFLAGS"
fi
# Add useful warning options for tracking down problems...
WARNING_OPTIONS="-Wall -Wno-format-y2k -Wunused -Wno-unused-result -Wsign-conversion"
# Test GCC version for certain warning flags since -Werror
# doesn't trigger...
gccversion=`$CC --version | head -1 | awk '{print $NF}'`
case "$gccversion" in
7.* | 8.*)
WARNING_OPTIONS="$WARNING_OPTIONS -Wno-format-truncation -Wno-tautological-compare"
;;
esac
# Additional warning options for development testing...
if test -d .git; then
WARNING_OPTIONS="-Werror $WARNING_OPTIONS"
fi
else
# Add vendor-specific compiler options...
case $host_os_name in
sunos*)
# Solaris
if test -z "$OPTIM"; then
OPTIM="-xO2"
fi
if test $PICFLAG = 1; then
OPTIM="-KPIC $OPTIM"
fi
;;
*)
# Running some other operating system; inform the user
# they should contribute the necessary options via
# Github...
echo "Building CUPS with default compiler optimizations; contact the CUPS developers on Github"
echo "(https://github.com/apple/cups/issues) with the uname and compiler options needed for"
echo "your platform, or set the CFLAGS and LDFLAGS environment variables before running"
echo "configure."
;;
esac
fi
# Add general compiler options per platform...
case $host_os_name in
linux*)
# glibc 2.8 and higher breaks peer credentials unless you
# define _GNU_SOURCE...
OPTIM="$OPTIM -D_GNU_SOURCE"
# The -z relro option is provided by the Linux linker command to
# make relocatable data read-only.
if test x$enable_relro = xyes; then
RELROFLAGS="-Wl,-z,relro,-z,now"
fi
;;
esac
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