242 lines
10 KiB
Text
242 lines
10 KiB
Text
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dnl detect if current compiler is clang or gcc (or...)
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AC_DEFUN([NUT_COMPILER_FAMILY],
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[
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AC_CACHE_CHECK([if CC compiler family is GCC],
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[nut_cv_GCC],
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[AS_IF([test -n "$CC"],
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[AS_IF([$CC --version 2>&1 | grep 'Free Software Foundation' > /dev/null],
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[nut_cv_GCC=yes],[nut_cv_GCC=no])],
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[AC_MSG_ERROR([CC is not set])]
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)])
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AC_CACHE_CHECK([if CXX compiler family is GCC],
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[nut_cv_GXX],
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[AS_IF([test -n "$CXX"],
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[AS_IF([$CXX --version 2>&1 | grep 'Free Software Foundation' > /dev/null],
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[nut_cv_GXX=yes],[nut_cv_GXX=no])],
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[AC_MSG_ERROR([CXX is not set])]
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)])
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AC_CACHE_CHECK([if CPP preprocessor family is GCC],
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[nut_cv_GPP],
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[AS_IF([test -n "$CPP"],
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[AS_IF([$CPP --version 2>&1 | grep 'Free Software Foundation' > /dev/null],
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[nut_cv_GPP=yes],[nut_cv_GPP=no])],
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[AC_MSG_ERROR([CPP is not set])]
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)])
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AS_IF([test "x$GCC" = "x" && test "$nut_cv_GCC" = yes], [GCC=yes])
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AS_IF([test "x$GXX" = "x" && test "$nut_cv_GXX" = yes], [GXX=yes])
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AS_IF([test "x$GPP" = "x" && test "$nut_cv_GPP" = yes], [GPP=yes])
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AC_CACHE_CHECK([if CC compiler family is clang],
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[nut_cv_CLANGCC],
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[AS_IF([test -n "$CC"],
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[AS_IF([$CC --version 2>&1 | grep -E '(clang version|Apple LLVM version .*clang-)' > /dev/null],
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[nut_cv_CLANGCC=yes],[nut_cv_CLANGCC=no])],
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[AC_MSG_ERROR([CC is not set])]
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)])
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AC_CACHE_CHECK([if CXX compiler family is clang],
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[nut_cv_CLANGXX],
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[AS_IF([test -n "$CXX"],
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[AS_IF([$CXX --version 2>&1 | grep -E '(clang version|Apple LLVM version .*clang-)' > /dev/null],
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[nut_cv_CLANGXX=yes],[nut_cv_CLANGXX=no])],
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[AC_MSG_ERROR([CXX is not set])]
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)])
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AC_CACHE_CHECK([if CPP preprocessor family is clang],
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[nut_cv_CLANGPP],
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[AS_IF([test -n "$CPP"],
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[AS_IF([$CPP --version 2>&1 | grep -E '(clang version|Apple LLVM version .*clang-)' > /dev/null],
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[nut_cv_CLANGPP=yes],[nut_cv_CLANGPP=no])],
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[AC_MSG_ERROR([CPP is not set])]
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)])
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AS_IF([test "x$CLANGCC" = "x" && test "$nut_cv_CLANGCC" = yes], [CLANGCC=yes])
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AS_IF([test "x$CLANGXX" = "x" && test "$nut_cv_CLANGXX" = yes], [CLANGXX=yes])
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AS_IF([test "x$CLANGPP" = "x" && test "$nut_cv_CLANGPP" = yes], [CLANGPP=yes])
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])
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AC_DEFUN([NUT_CHECK_COMPILE_FLAG],
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[
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dnl Note: with this line uncommented, builds report
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dnl sed: 0: conftest.c: No such file or directory
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dnl so seemingly try to parse the method without args:
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dnl### AC_REQUIRE([AX_RUN_OR_LINK_IFELSE])
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dnl Note: per https://stackoverflow.com/questions/52557417/how-to-check-support-compile-flag-in-autoconf-for-clang
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dnl the -Werror below is needed to detect "warnings" about unsupported options
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COMPILERFLAG="$1"
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dnl We also try to run an actual build since tools called from that might
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dnl complain if they are forwarded unknown flags accepted by the front-end.
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SAVED_CFLAGS="$CFLAGS"
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SAVED_CXXFLAGS="$CXXFLAGS"
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AC_LANG_PUSH([C])
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AX_CHECK_COMPILE_FLAG([${COMPILERFLAG}],
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[CFLAGS="$CFLAGS ${COMPILERFLAG}"
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AX_RUN_OR_LINK_IFELSE([AC_LANG_PROGRAM([],[])],
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[], [CFLAGS="$SAVED_CFLAGS"])
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], [], [-Werror])
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AC_LANG_POP([C])
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AC_LANG_PUSH([C++])
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AX_CHECK_COMPILE_FLAG([${COMPILERFLAG}],
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[CXXFLAGS="$CXXFLAGS ${COMPILERFLAG}"
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AX_RUN_OR_LINK_IFELSE([AC_LANG_PROGRAM([],[])],
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[], [CXXFLAGS="$SAVED_CXXFLAGS"])
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], [], [-Werror])
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AC_LANG_POP([C++])
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])
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AC_DEFUN([NUT_COMPILER_FAMILY_FLAGS],
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[
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AC_MSG_NOTICE([Detecting support for additional compiler flags])
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dnl -Qunused-arguments:
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dnl Do not die due to `clang: error: argument unused during compilation: '-I .'`
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dnl -Wno-unknown-warning-option: Do not die (on older clang releases) due to
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dnl error: unknown warning option '-Wno-double-promotion'; did you mean
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dnl '-Wno-documentation'? [-Werror,-Wunknown-warning-option]
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dnl -fcolor-diagnostics: help find where bugs are in the wall of text (clang)
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dnl -fdiagnostics-color=ARG: help find where bugs are in the wall of text (gcc)
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dnl First check for this to avoid failing on unused include paths etc:
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NUT_CHECK_COMPILE_FLAG([-Qunused-arguments])
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m4_foreach_w([TESTCOMPILERFLAG], [
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-Wno-reserved-identifier
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], [
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NUT_CHECK_COMPILE_FLAG([TESTCOMPILERFLAG])
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])
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dnl Note: each m4_foreach_w arg must be named uniquely
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dnl Note: Seems -fcolor-diagnostics is clang-only and sometimes
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dnl gcc blindly accepts it in test and fails to use later.
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AS_IF([test x"${nut_enable_Wcolor}" = xyes], [
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m4_foreach_w([TESTCOMPILERFLAG_COLOR], [
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-fdiagnostics-color=always
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], [
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NUT_CHECK_COMPILE_FLAG([TESTCOMPILERFLAG_COLOR])
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])
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], [AC_MSG_NOTICE([NOT checking for options to request colorized compiler output (pass --enable-Wcolor for that)])])
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dnl Last check for this to avoid accepting anything regardless of support.
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dnl NOTE that some toolkit versions accept this option blindly and without
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dnl really supporting it (but not erroring out on it, either):
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dnl cc1: note: unrecognized command-line option '-Wno-unknown-warning-option'
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dnl may have been intended to silence earlier diagnostics
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NUT_CHECK_COMPILE_FLAG([-Wno-unknown-warning-option])
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dnl # Older "brute-forced" settings:
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dnl AS_IF([test "x$CLANGCC" = xyes], [CFLAGS="$CFLAGS -Wno-unknown-warning-option"])
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dnl AS_IF([test "x$CLANGXX" = xyes], [CXXFLAGS="$CXXFLAGS -Wno-unknown-warning-option"])
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dnl # Despite the internet lore, practical GCC versions seen so far
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dnl # (4.x-10.x) do not know of this CLI option, with varied results
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dnl # from "cc1: note: unrecognized command-line option '-Wno-unknown-warning'
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dnl # may have been intended to silence earlier diagnostics"
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dnl # to "cc1: error: unrecognized command line option '-Wno-unknown-warning'
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dnl # [-Werror]"... so we do not pass it by default:
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dnl AS_IF([test "x$GCC" = xyes], [CFLAGS="$CFLAGS -Wno-unknown-warning"])
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dnl AS_IF([test "x$GXX" = xyes], [CXXFLAGS="$CXXFLAGS -Wno-unknown-warning"])
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dnl # There should be no need to include standard system paths (and possibly
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dnl # confuse the compiler assumptions - along with its provided headers)...
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dnl # ideally; in practice however cppunit, net-snmp and some system include
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dnl # files do cause grief to picky compiler settings (more so from third
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dnl # party packages shipped via /usr/local/... namespace):
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AS_IF([test "x$CLANGCC" = xyes -o "x$GCC" = xyes], [
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dnl # CFLAGS="-isystem /usr/include $CFLAGS"
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AS_IF([test -d /usr/local/include],
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[CFLAGS="-isystem /usr/local/include $CFLAGS"])
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AS_IF([test -d /usr/pkg/include],
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[CFLAGS="-isystem /usr/pkg/include $CFLAGS"])
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])
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AS_IF([test "x$CLANGXX" = xyes -o "x$GXX" = xyes], [
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dnl # CXXFLAGS="-isystem /usr/include $CXXFLAGS"
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AS_IF([test -d /usr/local/include],
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[CXXFLAGS="-isystem /usr/local/include $CXXFLAGS"])
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AS_IF([test -d /usr/pkg/include],
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[CXXFLAGS="-isystem /usr/pkg/include $CXXFLAGS"])
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])
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dnl # Default to avoid noisy warnings on older compilers
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dnl # (gcc-4.x, clang-3.x) due to their preference of
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dnl # ANSI C (C89/C90) out of the box. While NUT codebase
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dnl # currently can build in that mode, reliability of
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dnl # results is uncertain - third-party and/or system
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dnl # headers and libs seemingly no longer care for C90
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dnl # on modern systems, and we have no recent data from
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dnl # truly legacy systems which have no choice.
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dnl # Some distributions and platforms also have problems
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dnl # building in "strict C" mode, so for the GNU-compatible
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dnl # compilers we default to the GNU C/C++ dialects.
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AS_IF([test "x$GCC" = xyes -o "x$CLANGCC" = xyes],
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[AS_CASE(["${CFLAGS}"], [-std=*], [],
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[AC_LANG_PUSH([C])
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AX_CHECK_COMPILE_FLAG([-std=gnu99],
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[AC_MSG_NOTICE([Defaulting C standard support to GNU C99 on a GCC or CLANG compatible compiler])
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CFLAGS="$CFLAGS -std=gnu99"
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], [], [-Werror])
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AC_LANG_POP([C])
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])
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])
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dnl # Note: this might upset some very old compilers
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dnl # but then by default we wouldn't build C++ parts
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AS_IF([test "x$GCC" = xyes -o "x$CLANGCC" = xyes],
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[AS_CASE(["${CXXFLAGS}"], [-std=*], [],
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[AC_LANG_PUSH([C++])
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AX_CHECK_COMPILE_FLAG([-std=gnu++11],
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[AC_MSG_NOTICE([Defaulting C++ standard support to GNU C++11 on a GCC or CLANG compatible compiler])
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CXXFLAGS="$CXXFLAGS -std=gnu++11"
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], [], [-Werror])
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AC_LANG_POP([C++])
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])
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])
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])
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AC_DEFUN([NUT_COMPILER_FAMILY_FLAGS_DEFAULT_STANDARD],
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[
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dnl # Default to avoid noisy warnings on older compilers
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dnl # (gcc-4.x, clang-3.x) due to their preference of
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dnl # ANSI C (C89/C90) out of the box. While NUT codebase
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dnl # currently can build in that mode, reliability of
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dnl # results is uncertain - third-party and/or system
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dnl # headers and libs seemingly no longer care for C90
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dnl # on modern systems, and we have no recent data from
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dnl # truly legacy systems which have no choice.
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dnl # Some distributions and platforms also have problems
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dnl # building in "strict C" mode, so for the GNU-compatible
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dnl # compilers we default to the GNU C/C++ dialects.
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AS_IF([test "x$GCC" = xyes -o "x$CLANGCC" = xyes],
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[AS_CASE(["${CFLAGS}"], [*-std=*], [],
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[AC_LANG_PUSH([C])
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AX_CHECK_COMPILE_FLAG([-std=gnu99],
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[AC_MSG_NOTICE([Defaulting C standard support to GNU C99 on a GCC or CLANG compatible compiler])
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CFLAGS="$CFLAGS -std=gnu99"
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], [], [-Werror])
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AC_LANG_POP([C])
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])
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])
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dnl # Note: this might upset some very old compilers
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dnl # but then by default we wouldn't build C++ parts
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AS_IF([test "x$GCC" = xyes -o "x$CLANGCC" = xyes],
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[AS_CASE(["${CXXFLAGS}"], [*-std=*], [],
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[AC_LANG_PUSH([C++])
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AX_CHECK_COMPILE_FLAG([-std=gnu++11],
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[AC_MSG_NOTICE([Defaulting C++ standard support to GNU C++11 on a GCC or CLANG compatible compiler])
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CXXFLAGS="$CXXFLAGS -std=gnu++11"
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], [], [-Werror])
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AC_LANG_POP([C++])
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])
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])
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])
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