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## Copyright (C) 1996-2019 The Squid Software Foundation and contributors
##
## Squid software is distributed under GPLv2+ license and includes
## contributions from numerous individuals and organizations.
## Please see the COPYING and CONTRIBUTORS files for details.
##
# check if the compiler accepts a supplied flag
# first argument is the variable containing the result
# (will be set to "yes" or "no")
# second argument is the flag to be tested, verbatim
#
AC_DEFUN([SQUID_CC_CHECK_ARGUMENT],[
AC_CACHE_CHECK([whether compiler accepts $2],[$1],
[{
AC_REQUIRE([AC_PROG_CC])
SAVED_CFLAGS="$CFLAGS"
SAVED_CXXFLAGS="$CXXFLAGS"
CFLAGS="$CFLAGS $2"
CXXFLAGS="$CXXFLAGS $2"
AC_TRY_LINK([],[int foo; ],
[$1=yes],[$1=no])
CFLAGS="$SAVED_CFLAGS"
CXXFLAGS="$SAVED_CXXFLAGS"
}])
])
# Check if the compiler requires a supplied flag to build a test program.
# When cross-compiling set flags explicitly.
#
# first argument is the variable containing the result
# (will be set to "yes" or "no")
# second argument is the flag to be tested, verbatim
# third is the #include and global setup for test program, verbatim
# fourth is the test program to compile, verbatim
#
AC_DEFUN([SQUID_CC_REQUIRE_ARGUMENT],[
AC_CACHE_CHECK([whether compiler requires $2],[$1],
[{
AC_REQUIRE([AC_PROG_CC])
SAVED_CFLAGS="$CFLAGS"
SAVED_CXXFLAGS="$CXXFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM($3,$4)],[$1=no],[],[$1=no])
if test "x$1" != "xno" ; then
CFLAGS="$CFLAGS $2"
CXXFLAGS="$CXXFLAGS $2"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM($3,$4)],[$1=yes],[$1=no],[$1=no])
fi
CFLAGS="$SAVED_CFLAGS"
CXXFLAGS="$SAVED_CXXFLAGS"
}])
])
# detect what kind of compiler we're using, either by using hints from
# autoconf itself, or by using predefined preprocessor macros
# sets the variable squid_cv_compiler to one of
# - gcc
# - sunstudio
# - none (undetected)
#
AC_DEFUN([SQUID_CC_GUESS_VARIANT], [
AC_CACHE_CHECK([what kind of compiler we're using],[squid_cv_compiler],
[
AC_REQUIRE([AC_PROG_CC])
dnl repeat the next block for each compiler, changing the
dnl preprocessor definition so that it depends on platform-specific
dnl predefined macros
dnl SunPro CC
if test -z "$squid_cv_compiler" ; then
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#if !defined(__SUNPRO_C) && !defined(__SUNPRO_CC)
#error "not sunpro c"
#endif
]])],[squid_cv_compiler="sunstudio"],[])
fi
dnl Intel CC
if test -z "$squid_cv_compiler" ; then
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#if !defined(__ICC)
#error "not Intel(R) C++ Compiler"
#endif
]])],[squid_cv_compiler="icc"],[])
fi
dnl clang
if test -z "$squid_cv_compiler" ; then
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#if !defined(__clang__)
#error "not clang"
#endif
]])],[squid_cv_compiler="clang"],[])
fi
dnl microsoft visual c++
if test -z "$squid_cv_compiler" ; then
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#if !defined(_MSC_VER)
#error "not Microsoft VC++"
#endif
]])],[squid_cv_compiler="msvc"],[])
fi
dnl gcc. MUST BE LAST as many other compilers also define it for compatibility
if test -z "$squid_cv_compiler" ; then
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#if !defined(__GNUC__)
#error "not gcc"
#endif
]])],[squid_cv_compiler="gcc"],[])
fi
dnl end of block to be repeated
if test -z "$squid_cv_compiler" ; then
squid_cv_compiler="none"
fi
]) dnl AC_CACHE_CHECK
]) dnl AC_DEFUN
# define the flag to use to have the compiler treat warnings as errors
# requirs SQUID_CC_GUESS_VARIANT
# Sets a few variables to contain some compiler-dependent command line
# options, or to empty strings if the compiler doesn't support those
# options
# They are (with their GCC equivalent):
# squid_cv_cc_option_werror (-Werror)
# squid_cv_cxx_option_werror (-Werror)
# squid_cv_cc_option_wall (-Wall)
# squid_cv_cc_option_optimize (-O3)
#
AC_DEFUN([SQUID_CC_GUESS_OPTIONS], [
AC_REQUIRE([SQUID_CC_GUESS_VARIANT])
AC_MSG_CHECKING([for compiler variant])
case "$squid_cv_compiler" in
gcc)
squid_cv_cc_option_werror="-Werror"
squid_cv_cxx_option_werror="-Werror"
squid_cv_cc_option_wall="-Wall"
squid_cv_cc_option_optimize="-O3"
squid_cv_cc_arg_pipe="-pipe"
;;
sunstudio)
squid_cv_cc_option_werror="-errwarn=%all -errtags"
squid_cv_cxx_option_werror="-errwarn=%all,no%badargtype2w,no%wbadinit,no%wbadasg -errtags"
squid_cv_cc_option_wall="+w"
squid_cv_cc_option_optimize="-fast"
squid_cv_cc_arg_pipe=""
;;
clang)
squid_cv_cxx_option_werror="-Werror -Qunused-arguments"
squid_cv_cc_option_werror="$squid_cv_cxx_option_werror"
squid_cv_cc_option_wall="-Wall"
squid_cv_cc_option_optimize="-O2"
squid_cv_cc_arg_pipe=""
;;
icc)
squid_cv_cxx_option_werror="-Werror"
squid_cv_cc_option_werror="$squid_cv_cxx_option_werror"
squid_cv_cc_option_wall="-Wall"
squid_cv_cc_option_optimize="-O2"
squid_cv_cc_arg_pipe=""
;;
*)
squid_cv_cxx_option_werror=""
squid_cv_cc_option_werror=""
squid_cv_cc_option_wall=""
squid_cv_cc_option_optimize="-O"
squid_cv_cc_arg_pipe=""
;;
esac
AC_MSG_RESULT([$squid_cv_compiler])
])
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