diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/.gitignore | 1 | ||||
| -rw-r--r-- | m4/ax_python.m4 | 284 |
2 files changed, 285 insertions, 0 deletions
diff --git a/m4/.gitignore b/m4/.gitignore index 2c04163659..cc778b9e99 100644 --- a/m4/.gitignore +++ b/m4/.gitignore @@ -4,6 +4,7 @@ !ax_compare_version.m4 !ax_prog_perl_modules.m4 !ax_pthread.m4 +!ax_python.m4 !ax_sys_weak_alias.m4 !ax_sys_weak_alias.m4 !pkg.m4 diff --git a/m4/ax_python.m4 b/m4/ax_python.m4 new file mode 100644 index 0000000000..32043c81ae --- /dev/null +++ b/m4/ax_python.m4 @@ -0,0 +1,284 @@ +dnl FRR Python autoconf magic +dnl 2019 David Lamparter for NetDEF, Inc. +dnl SPDX-License-Identifier: GPL-2.0-or-later + +dnl the _ at the beginning will be cut off (to support the empty version string) +m4_define_default([_FRR_PY_VERS], [_3 _ _2 _3.7 _3.6 _3.5 _3.4 _3.3 _3.2 _2.7]) + +dnl check basic interpreter properties (py2/py3) +dnl doubles as simple check whether the interpreter actually works +dnl also swaps in the full path to the interpreter +dnl arg1: if-true, arg2: if-false +AC_DEFUN([_FRR_PYTHON_INTERP], [dnl +AC_ARG_VAR([PYTHON], [Python interpreter to use])dnl + AC_MSG_CHECKING([python interpreter $PYTHON]) + AC_RUN_LOG(["$PYTHON" -c 'import sys; open("conftest.pyver", "w").write(sys.executable or ""); sys.exit(not (sys.version_info.major == 2 and sys.version_info.minor >= 7))']) + py2=$ac_status + _py2_full="`cat conftest.pyver 2>/dev/null`" + rm -f "conftest.pyver" >/dev/null 2>/dev/null + + AC_RUN_LOG(["$PYTHON" -c 'import sys; open("conftest.pyver", "w").write(sys.executable or ""); sys.exit(not ((sys.version_info.major == 3 and sys.version_info.minor >= 2) or sys.version_info.major > 3))']) + py3=$ac_status + _py3_full="`cat conftest.pyver 2>/dev/null`" + rm -f "conftest.pyver" >/dev/null 2>/dev/null + + case "p${py2}p${py3}" in + p0p1) frr_cv_python=python2 + _python_full="$_py2_full" ;; + p1p0) frr_cv_python=python3 + _python_full="$_py3_full" ;; + *) frr_cv_python=none ;; + esac + + if test "$frr_cv_python" = none; then + AC_MSG_RESULT([not working]) + $2 + else + test -n "$_python_full" -a -x "$_python_full" && PYTHON="$_python_full" + AC_MSG_RESULT([$PYTHON ($frr_cv_python)]) + $1 + fi + + dnl return value + test "$frr_cv_python" != none +]) + +dnl check whether $PYTHON has modules available +dnl arg1: list of modules (space separated) +dnl arg2: if all true, arg3: if any missing +dnl also sets frr_py_mod_<name> to "true" or "false" +AC_DEFUN([FRR_PYTHON_MODULES], [ + result=true + for pymod in $1; do + AC_MSG_CHECKING([whether $PYTHON module $pymod is available]) + AC_RUN_LOG(["$PYTHON" -c "import $pymod"]) + sane="`echo \"$pymod\" | tr -c '[a-zA-Z0-9\n]' '_'`" + if test "$ac_status" -eq 0; then + AC_MSG_RESULT([yes]) + eval frr_py_mod_$sane=true + else + AC_MSG_RESULT([no]) + eval frr_py_mod_$sane=false + result=false + fi + done + if $result; then + m4_default([$2], [:]) + else + m4_default([$3], [:]) + fi + $result +]) + +dnl check whether $PYTHON has modules available +dnl arg1: list of modules (space separated) +dnl arg2: command line parameters for executing +dnl arg3: if all true, arg4: if any missing +dnl also sets frr_py_modexec_<name> to "true" or "false" +AC_DEFUN([FRR_PYTHON_MOD_EXEC], [ + result=true + for pymod in $1; do + AC_MSG_CHECKING([whether $PYTHON module $pymod is executable]) + AC_RUN_LOG(["$PYTHON" -m "$pymod" $2 > /dev/null]) + sane="`echo \"$pymod\" | tr -c '[a-zA-Z0-9\n]' '_'`" + if test "$ac_status" -eq 0; then + AC_MSG_RESULT([yes]) + eval frr_py_modexec_$sane=true + else + AC_MSG_RESULT([no]) + eval frr_py_modexec_$sane=false + result=false + fi + done + if $result; then + m4_default([$3], [:]) + else + m4_default([$4], [:]) + fi + $result +]) + +dnl check whether we can build & link python bits +dnl input: PYTHON_CFLAGS and PYTHON_LIBS +AC_DEFUN([_FRR_PYTHON_DEVENV], [ + result=true + AC_LINK_IFELSE_FLAGS([$PYTHON_CFLAGS], [$PYTHON_LIBS], [AC_LANG_PROGRAM([ +#include <Python.h> +#if PY_VERSION_HEX < 0x02070000 +#error python too old +#endif +int main(void); +], +[ +{ + Py_Initialize(); + return 0; +} +])], [ + # some python installs are missing the zlib dependency... + PYTHON_LIBS="${PYTHON_LIBS} -lz" + AC_LINK_IFELSE_FLAGS([$PYTHON_CFLAGS], [$PYTHON_LIBS], [AC_LANG_PROGRAM([ +#include <Python.h> +#if PY_VERSION_HEX < 0x02070000 +#error python too old +#endif +int main(void); +], +[ +{ + Py_Initialize(); + return 0; +} +])], [ + result=false + AC_MSG_RESULT([no]) + ], [:]) + ], [:]) + + if $result; then + AC_LINK_IFELSE_FLAGS([$PYTHON_CFLAGS], [$PYTHON_LIBS], [AC_LANG_PROGRAM([ +#include <Python.h> +#if PY_VERSION_HEX != $1 +#error python version mismatch +#endif +int main(void); +], +[ +{ + Py_Initialize(); + return 0; +} +])], [ + result=false + AC_MSG_RESULT([version mismatch]) + ], [ + AC_MSG_RESULT([yes]) + ]) + fi + + if $result; then + m4_default([$2], [:]) + else + m4_default([$3], [ + unset PYTHON_LIBS + unset PYTHON_CFLAGS + ]) + fi +]) + +AC_DEFUN([_FRR_PYTHON_GETDEV], [dnl +AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl + + py_abi="` \"$1\" -c \"import sys; print(getattr(sys, 'abiflags', ''))\"`" + py_hex="` \"$1\" -c \"import sys; print(hex(sys.hexversion))\"`" + py_ldver="` \"$1\" -c \"import sysconfig; print(sysconfig.get_config_var('LDVERSION') or '')\"`" + py_ver="` \"$1\" -c \"import sysconfig; print(sysconfig.get_config_var('VERSION') or '')\"`" + py_bindir="`\"$1\" -c \"import sysconfig; print(sysconfig.get_config_var('BINDIR') or '')\"`" + test -z "$py_bindir" || py_bindir="$py_bindir/" + echo "py_abi=${py_abi} py_ldver=${py_ldver} py_ver=${py_ver} py_bindir=${py_bindir}" >&AS_MESSAGE_LOG_FD + + py_found=false + + for tryver in "${py_ldver}" "${py_ver}"; do + pycfg="${py_bindir}python${tryver}-config" + AC_MSG_CHECKING([whether ${pycfg} is available]) + if "$pycfg" --configdir >/dev/null 2>/dev/null; then + AC_MSG_RESULT([yes]) + + PYTHON_CFLAGS="`\"$pycfg\" --includes`" + PYTHON_LIBS="`\"$pycfg\" --ldflags`" + + AC_MSG_CHECKING([whether ${pycfg} provides a working build environment]) + _FRR_PYTHON_DEVENV([$py_hex], [ + py_found=true + break + ]) + else + AC_MSG_RESULT([no]) + fi + + pkg_failed=no + AC_MSG_CHECKING([whether pkg-config python-${tryver} is available]) + unset PYTHON_CFLAGS + unset PYTHON_LIBS + pkg="python-${tryver}" + pkg="${pkg%-}" + _PKG_CONFIG([PYTHON_CFLAGS], [cflags], [${pkg}]) + _PKG_CONFIG([PYTHON_LIBS], [libs], [${pkg}]) + if test $pkg_failed = no; then + AC_MSG_RESULT([yes]) + + PYTHON_CFLAGS=$pkg_cv_PYTHON_CFLAGS + PYTHON_LIBS=$pkg_cv_PYTHON_LIBS + + AC_MSG_CHECKING([whether pkg-config python-${tryver} provides a working build environment]) + _FRR_PYTHON_DEVENV([$py_hex], [ + py_found=true + break + ]) + else + AC_MSG_RESULT([no]) + fi + done + + if $py_found; then + m4_default([$2], [:]) + else + unset PYTHON_CFLAGS + unset PYTHON_LIBS + m4_default([$3], [:]) + fi +]) + +dnl just find python without checking headers/libs +AC_DEFUN([FRR_PYTHON], [ + dnl user override + if test "x$PYTHON" != "x"; then + _FRR_PYTHON_INTERP([], [ + AC_MSG_ERROR([PYTHON ($PYTHON) explicitly specified but not working]) + ]) + else + for frr_pyver in _FRR_PY_VERS; do + PYTHON="python${frr_pyver#_}" + _FRR_PYTHON_INTERP([break]) + PYTHON=":" + done + if test "$PYTHON" = ":"; then + AC_MSG_ERROR([no working python version found]) + fi + fi + AC_SUBST([PYTHON]) +]) + +dnl find python with checking headers/libs +AC_DEFUN([FRR_PYTHON_DEV], [dnl +AC_ARG_VAR([PYTHON_CFLAGS], [C compiler flags for Python])dnl +AC_ARG_VAR([PYTHON_LIBS], [linker flags for Python])dnl + + dnl user override + if test "x$PYTHON" != "x"; then + _FRR_PYTHON_INTERP([], [ + AC_MSG_ERROR([PYTHON ($PYTHON) explicitly specified but not working]) + ]) + _FRR_PYTHON_GETDEV([$PYTHON], [], [ + AC_MSG_ERROR([PYTHON ($PYTHON) explicitly specified but development environment not working]) + ]) + else + for frr_pyver in _FRR_PY_VERS; do + PYTHON="python${frr_pyver#_}" + _FRR_PYTHON_INTERP([ + _FRR_PYTHON_GETDEV([$PYTHON], [ + break + ]) + ]) + PYTHON=":" + done + if test "$PYTHON" = ":"; then + AC_MSG_ERROR([no working python version found]) + fi + fi + + AC_SUBST([PYTHON_CFLAGS]) + AC_SUBST([PYTHON_LIBS]) + AC_SUBST([PYTHON]) +]) |