# configure.target
-
+#
# This shell script handles all target based configuration for libstdc++.
# It sets various shell variables based on the the target and the
-# configuration options. You can modify this shell script without
-# needing to rerun autoconf.
-
-# This shell script should be invoked as
-# . configure.target
-# If it encounters an error, it will exit with a message.
-
-# It uses the following shell variables:
-# target The configuration target
+# configuration options. You can modify this shell script without needing
+# to rerun autoconf/aclocal/etc. This file is "sourced" not executed.
+#
+# You should read docs/html/17_intro/porting.* to make sense of this file.
+#
+#
+# It uses the following shell variables as set by config.guess:
+# target The configuration target (full CPU-vendor-OS triplet)
# target_cpu The configuration target CPU
# target_os The configuration target OS
-# target_optspace --enable-target-optspace ("yes", "no", "")
-
-# It possibly modifies the following shell variables:
-# glibcpp_cflags Special CFLAGS to use when building
-# glibcpp_cxxflags Special CXXFLAGS to use when building
-# cpu_include_dir CPU-specific include directory, relative to srcdir
-# os_include_dir OS-specific include directory, relative to srcdir
-# The first two are set in configure.host and modified here.
-
-
-# These are "local" and should be set in the switch statements below. They
-# will be appended to their real conterparts once the dust settles.
-l_glibcpp_cflags=
-l_glibcpp_cxxflags=
-
-
-# Set any CPU dependent compiler flags.
+#
+#
+# It sets the following shell variables:
+#
+# cpu_include_dir CPU-specific directory, defaults to cpu/generic
+# if cpu/target_cpu doesn't exist. This is
+# used to set the next two:
+# ATOMICITYH location of bits/atomicity.h,
+# defaults to cpu_include_dir
+# CPULIMITSH location of bits/cpu_limits.h,
+# defaults to cpu_include_dir
+#
+# os_include_dir OS-specific directory, defaults to os/generic.
+#
+# c_model the model to use for "C" headers, defaults to c_std.
+#
+# c_compatibility if "C" compatibility headers are necessary,
+# defaults to no.
+#
+# It possibly modifies the following variables:
+#
+# OPT_LDFLAGS extra flags to pass when linking the library, of
+# the form '-Wl,blah'
+# (defaults to empty in acinclude.m4)
+#
+#
+# If the defaults will not work for your platform, you need only change the
+# variables that won't work, i.e., you do not need to explicitly set a
+# working variable to its default. Most targets only need to change the two
+# *_include_dir variables.
+
+
+# DEFAULTS
+# Try to guess a default cpu_include_dir based on the name of the CPU. We
+# cannot do this for os_include_dir; there are too many portable operating
+# systems out there. :-)
+if test -d ${glibcpp_srcdir}/config/cpu/${target_cpu}; then
+ cpu_include_dir="cpu/${target_cpu}"
+else
+ cpu_include_dir="cpu/generic"
+fi
+
+c_model=c_std
+c_compatibility=no
+
+
+# TARGET-SPECIFIC OVERRIDES
+# Set any CPU-dependent bits.
+# Here we override defaults and catch more general cases due to naming
+# conventions (e.g., chip_name* to catch all variants).
# THIS TABLE IS SORTED. KEEP IT THAT WAY.
-
case "${target_cpu}" in
alpha*)
- cpu_include_dir="config/cpu/alpha"
+ cpu_include_dir="cpu/alpha"
;;
arm*)
- cpu_include_dir="config/cpu/arm"
+ cpu_include_dir="cpu/arm"
+ ;;
+ i486 | i586 | i686 | i786)
+ cpu_include_dir="cpu/i486"
+ CPULIMITSH="cpu/i386"
;;
- ia64)
- cpu_include_dir="config/cpu/ia64"
+ m68k | m680[246]0)
+ cpu_include_dir="cpu/m68k"
;;
- i386)
- cpu_include_dir="config/cpu/i386"
+ mips)
+ # This is only until the mips routines are fixed.
+ cpu_include_dir="cpu/generic"
;;
- i486 | i586 | i686 | i786)
- cpu_include_dir="config/cpu/i486"
+ mmix)
+ ATOMICITYH="cpu/generic"
;;
powerpc | rs6000)
- cpu_include_dir="config/cpu/powerpc"
+ cpu_include_dir="cpu/powerpc"
+ ;;
+ s390 | s390x)
+ cpu_include_dir="cpu/s390"
;;
sparc64 | ultrasparc)
- cpu_include_dir="config/cpu/sparc/sparc64"
+ cpu_include_dir="cpu/sparc/sparc64"
;;
sparc*)
- cpu_include_dir="config/cpu/sparc/sparc32"
+ cpu_include_dir="cpu/sparc/sparc32"
;;
- *)
- cpu_include_dir="config/cpu/generic"
+ x86_64*)
+ cpu_include_dir="cpu/x86-64"
;;
esac
-# Set any OS dependent compiler flags.
+# Now look for the two files usually tied to a CPU model, and make default
+# choices for those if they haven't been explicitly set already.
+_cpu_incdir_fullpath=${glibcpp_srcdir}/config/${cpu_include_dir}
+if test x${ATOMICITYH+set} != xset; then
+ if test -f ${_cpu_incdir_fullpath}/bits/atomicity.h; then
+ ATOMICITYH=$cpu_include_dir
+ else
+ ATOMICITYH="cpu/generic"
+ fi
+fi
+if test x${CPULIMITSH+set} != xset; then
+ if test -f ${_cpu_incdir_fullpath}/bits/cpu_limits.h; then
+ CPULIMITSH=$cpu_include_dir
+ else
+ CPULIMITSH="cpu/generic"
+ fi
+fi
+unset _cpu_incdir_fullpath
+
+
+# Set any OS-dependent bits.
+# Set the os_include_dir.
+# Set c_model, c_compatibility here.
+# If atomic ops and/or numeric limits are OS-specific rather than
+# CPU-specifc, set those here too.
# THIS TABLE IS SORTED. KEEP IT THAT WAY.
-
case "${target_os}" in
- aix4.[[3456789]]* | aix[[56789]]*)
- os_include_dir="config/os/aix"
- case "$CXX" in
- *pthread*)
- enable_threads='posix'
- ;;
- *)
- enable_threads='no'
- ;;
- esac
+ aix4.[3456789]* | aix[56789]*)
+ # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
+ # os/aix/bits/atomicity.h works on earlier versions of AIX 4.*, so we
+ # explicitly duplicate the directory for 4.[<3].
+ os_include_dir="os/aix"
+ ATOMICITYH="os/aix"
+ OPT_LDFLAGS="-Wl,-G"
+ ;;
+ aix4.*)
+ ATOMICITYH="os/aix"
;;
aix*)
- os_include_dir="config/os/aix"
+ ATOMICITYH="cpu/generic"
;;
- bsd* | freebsd*)
- os_include_dir="config/os/bsd"
+ bsd* | freebsd* )
+ os_include_dir="os/bsd/freebsd"
;;
cygwin*)
- os_include_dir="config/os/newlib"
+ os_include_dir="os/newlib"
+ ;;
+ *djgpp*) # leading * picks up "msdosdjgpp"
+ os_include_dir="os/djgpp"
+ ;;
+ gnu* | linux*)
+ os_include_dir="os/gnu-linux"
+ ;;
+ hpux*)
+ os_include_dir="os/hpux"
+ CPULIMITSH="os/hpux"
;;
- linux*)
- os_include_dir="config/os/gnu-linux"
+ irix[1-6] | irix[1-5].* | irix6.[0-4])
+ # This is known to work on at least IRIX 5.2 and 6.3.
+ os_include_dir="os/irix/irix5.2"
+ ATOMICITYH=$os_include_dir
;;
- irix*)
- os_include_dir="config/os/irix"
+ irix6.5)
+ os_include_dir="os/irix/irix6.5"
+ ATOMICITYH=$os_include_dir
+ ;;
+ mingw32*)
+ os_include_dir="os/mingw32"
+ ;;
+ netbsd*)
+ os_include_dir="os/bsd/netbsd"
;;
solaris2.5*)
- os_include_dir="config/os/solaris/solaris2.5"
+ os_include_dir="os/solaris/solaris2.5"
;;
solaris2.6*)
- os_include_dir="config/os/solaris/solaris2.6"
+ os_include_dir="os/solaris/solaris2.6"
+ ;;
+ solaris2.[78]*)
+ os_include_dir="os/solaris/solaris2.7"
;;
- solaris2.7* | solaris2.8*)
- os_include_dir="config/os/solaris/solaris2.7"
+ windiss*)
+ os_include_dir="os/windiss"
+ ;;
+ qnx6.[12]*)
+ os_include_dir="os/qnx/qnx6.1"
+ c_model=c
;;
*)
- os_include_dir="config/os/generic"
+ os_include_dir="os/generic"
;;
esac
-# Set any flags dependant on the full target triplet.
+# Set any OS-dependent and CPU-dependent bits.
# THIS TABLE IS SORTED. KEEP IT THAT WAY.
-
case "${target}" in
- *-*-aix*)
- ATOMICITYH=$os_include_dir
- ;;
- *-*-freebsd*)
- ATOMICITYH=$cpu_include_dir
- ;;
- *-*-irix*)
- ATOMICITYH=$os_include_dir
- ;;
- *-*-linux*)
- ATOMICITYH=$cpu_include_dir
- ;;
- sparc*-*-*)
- ATOMICITYH=$cpu_include_dir
- ;;
- *)
- ATOMICITYH="config/cpu/generic"
- ;;
+ alpha*-*-*osf5*)
+ CPULIMITSH="os/osf/osf5.0"
+ ;;
esac
-
-# Okay, folks, show's over. Move along, move along.
-
-glibcpp_cflags="${glibcpp_cflags} ${libgcj_flags} ${l_glibcpp_cflags}"
-glibcpp_cxxflags="${glibcpp_cxxflags} ${libgcj_flags} ${l_glibcpp_cxxflags}"
-
-
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