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curl-compilers.m4
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#***************************************************************************
# _ _ ____ _
# Project ___| | | | _ \| |
# / __| | | | |_) | |
# | (__| |_| | _ <| |___
# \___|\___/|_| \_\_____|
#
# Copyright (C) 1998 - 2020, Daniel Stenberg, <[email protected]>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://curl.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
#***************************************************************************
# File version for 'aclocal' use. Keep it a single number.
# serial 67
dnl CURL_CHECK_COMPILER
dnl -------------------------------------------------
dnl Verify if the C compiler being used is known.
AC_DEFUN([CURL_CHECK_COMPILER], [
#
compiler_id="unknown"
compiler_num="0"
#
flags_dbg_all="unknown"
flags_dbg_yes="unknown"
flags_dbg_off="unknown"
flags_opt_all="unknown"
flags_opt_yes="unknown"
flags_opt_off="unknown"
#
flags_prefer_cppflags="no"
#
CURL_CHECK_COMPILER_DEC_C
CURL_CHECK_COMPILER_HPUX_C
CURL_CHECK_COMPILER_IBM_C
CURL_CHECK_COMPILER_INTEL_C
CURL_CHECK_COMPILER_CLANG
CURL_CHECK_COMPILER_GNU_C
CURL_CHECK_COMPILER_LCC
CURL_CHECK_COMPILER_SGI_MIPSPRO_C
CURL_CHECK_COMPILER_SGI_MIPS_C
CURL_CHECK_COMPILER_SUNPRO_C
CURL_CHECK_COMPILER_TINY_C
CURL_CHECK_COMPILER_WATCOM_C
#
if test "$compiler_id" = "unknown"; then
cat <<_EOF 1>&2
***
*** Warning: This configure script does not have information about the
*** compiler you are using, relative to the flags required to enable or
*** disable generation of debug info, optimization options or warnings.
***
*** Whatever settings are present in CFLAGS will be used for this run.
***
*** If you wish to help the curl project to better support your compiler
*** you can report this and the required info on the libcurl development
*** mailing list: https://cool.haxx.se/mailman/listinfo/curl-library/
***
_EOF
fi
])
dnl CURL_CHECK_COMPILER_CLANG
dnl -------------------------------------------------
dnl Verify if compiler being used is clang.
AC_DEFUN([CURL_CHECK_COMPILER_CLANG], [
AC_BEFORE([$0],[CURL_CHECK_COMPILER_GNU_C])dnl
AC_MSG_CHECKING([if compiler is clang])
CURL_CHECK_DEF([__clang__], [], [silent])
if test "$curl_cv_have_def___clang__" = "yes"; then
AC_MSG_RESULT([yes])
AC_MSG_CHECKING([if compiler is xlclang])
CURL_CHECK_DEF([__ibmxl__], [], [silent])
if test "$curl_cv_have_def___ibmxl__" = "yes" ; then
dnl IBM's almost-compatible clang version
AC_MSG_RESULT([yes])
compiler_id="XLCLANG"
else
AC_MSG_RESULT([no])
compiler_id="CLANG"
fi
fullclangver=`$CC -v 2>&1 | grep version`
clangver=`echo $fullclangver | grep "based on LLVM " | "$SED" 's/.*(based on LLVM \(@<:@0-9@:>@*\.@<:@0-9@:>@*\).*)/\1/'`
if test -z "$clangver"; then
if echo $fullclangver | grep "Apple LLVM version " >/dev/null; then
dnl Starting with XCode 7 / clang 3.7, Apple clang won't tell its upstream version
clangver="3.7"
else
clangver=`echo $fullclangver | "$SED" 's/.*version \(@<:@0-9@:>@*\.@<:@0-9@:>@*\).*/\1/'`
fi
fi
clangvhi=`echo $clangver | cut -d . -f1`
clangvlo=`echo $clangver | cut -d . -f2`
compiler_num=`(expr $clangvhi "*" 100 + $clangvlo) 2>/dev/null`
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_all="$flags_dbg_all -ggdb"
flags_dbg_all="$flags_dbg_all -gstabs"
flags_dbg_all="$flags_dbg_all -gstabs+"
flags_dbg_all="$flags_dbg_all -gcoff"
flags_dbg_all="$flags_dbg_all -gxcoff"
flags_dbg_all="$flags_dbg_all -gdwarf-2"
flags_dbg_all="$flags_dbg_all -gvms"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -Os -O3 -O4"
flags_opt_yes="-Os"
flags_opt_off="-O0"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_DEC_C
dnl -------------------------------------------------
dnl Verify if compiler being used is DEC C.
AC_DEFUN([CURL_CHECK_COMPILER_DEC_C], [
AC_MSG_CHECKING([if compiler is DEC/Compaq/HP C])
CURL_CHECK_DEF([__DECC], [], [silent])
CURL_CHECK_DEF([__DECC_VER], [], [silent])
if test "$curl_cv_have_def___DECC" = "yes" &&
test "$curl_cv_have_def___DECC_VER" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="DEC_C"
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_yes="-g2"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -O4"
flags_opt_yes="-O1"
flags_opt_off="-O0"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_GNU_C
dnl -------------------------------------------------
dnl Verify if compiler being used is GNU C
dnl
dnl $compiler_num will be set to MAJOR * 100 + MINOR for gcc less than version
dnl 7 and just $MAJOR * 100 for gcc version 7 and later.
dnl
dnl Examples:
dnl Version 1.2.3 => 102
dnl Version 2.95 => 295
dnl Version 4.7 => 407
dnl Version 9.2.1 => 900
dnl
AC_DEFUN([CURL_CHECK_COMPILER_GNU_C], [
AC_REQUIRE([CURL_CHECK_COMPILER_INTEL_C])dnl
AC_REQUIRE([CURL_CHECK_COMPILER_CLANG])dnl
AC_MSG_CHECKING([if compiler is GNU C])
CURL_CHECK_DEF([__GNUC__], [], [silent])
if test "$curl_cv_have_def___GNUC__" = "yes" &&
test "$compiler_id" = "unknown"; then
AC_MSG_RESULT([yes])
compiler_id="GNU_C"
gccver=`$CC -dumpversion`
gccvhi=`echo $gccver | cut -d . -f1`
gccvlo=`echo $gccver | cut -d . -f2`
compiler_num=`(expr $gccvhi "*" 100 + $gccvlo) 2>/dev/null`
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_all="$flags_dbg_all -ggdb"
flags_dbg_all="$flags_dbg_all -gstabs"
flags_dbg_all="$flags_dbg_all -gstabs+"
flags_dbg_all="$flags_dbg_all -gcoff"
flags_dbg_all="$flags_dbg_all -gxcoff"
flags_dbg_all="$flags_dbg_all -gdwarf-2"
flags_dbg_all="$flags_dbg_all -gvms"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -Os -Og -Ofast"
flags_opt_yes="-O2"
flags_opt_off="-O0"
CURL_CHECK_DEF([_WIN32], [], [silent])
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_HPUX_C
dnl -------------------------------------------------
dnl Verify if compiler being used is HP-UX C.
AC_DEFUN([CURL_CHECK_COMPILER_HPUX_C], [
AC_MSG_CHECKING([if compiler is HP-UX C])
CURL_CHECK_DEF([__HP_cc], [], [silent])
if test "$curl_cv_have_def___HP_cc" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="HP_UX_C"
flags_dbg_all="-g -s"
flags_dbg_yes="-g"
flags_dbg_off="-s"
flags_opt_all="-O +O0 +O1 +O2 +O3 +O4"
flags_opt_yes="+O2"
flags_opt_off="+O0"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_IBM_C
dnl -------------------------------------------------
dnl Verify if compiler being used is IBM C.
AC_DEFUN([CURL_CHECK_COMPILER_IBM_C], [
AC_MSG_CHECKING([if compiler is IBM C])
CURL_CHECK_DEF([__IBMC__], [], [silent])
if test "$curl_cv_have_def___IBMC__" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="IBM_C"
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -O4 -O5"
flags_opt_all="$flags_opt_all -qnooptimize"
flags_opt_all="$flags_opt_all -qoptimize=0"
flags_opt_all="$flags_opt_all -qoptimize=1"
flags_opt_all="$flags_opt_all -qoptimize=2"
flags_opt_all="$flags_opt_all -qoptimize=3"
flags_opt_all="$flags_opt_all -qoptimize=4"
flags_opt_all="$flags_opt_all -qoptimize=5"
flags_opt_yes="-O2"
flags_opt_off="-qnooptimize"
flags_prefer_cppflags="yes"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_INTEL_C
dnl -------------------------------------------------
dnl Verify if compiler being used is Intel C.
AC_DEFUN([CURL_CHECK_COMPILER_INTEL_C], [
AC_BEFORE([$0],[CURL_CHECK_COMPILER_GNU_C])dnl
AC_MSG_CHECKING([if compiler is Intel C])
CURL_CHECK_DEF([__INTEL_COMPILER], [], [silent])
if test "$curl_cv_have_def___INTEL_COMPILER" = "yes"; then
AC_MSG_RESULT([yes])
compiler_num="$curl_cv_def___INTEL_COMPILER"
CURL_CHECK_DEF([__unix__], [], [silent])
if test "$curl_cv_have_def___unix__" = "yes"; then
compiler_id="INTEL_UNIX_C"
flags_dbg_all="-g -g0"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -Os"
flags_opt_yes="-O2"
flags_opt_off="-O0"
else
compiler_id="INTEL_WINDOWS_C"
flags_dbg_all="/ZI /Zi /zI /zi /ZD /Zd /zD /zd /Z7 /z7 /Oy /Oy-"
flags_dbg_all="$flags_dbg_all /debug"
flags_dbg_all="$flags_dbg_all /debug:none"
flags_dbg_all="$flags_dbg_all /debug:minimal"
flags_dbg_all="$flags_dbg_all /debug:partial"
flags_dbg_all="$flags_dbg_all /debug:full"
flags_dbg_all="$flags_dbg_all /debug:semantic_stepping"
flags_dbg_all="$flags_dbg_all /debug:extended"
flags_dbg_yes="/Zi /Oy-"
flags_dbg_off="/debug:none /Oy-"
flags_opt_all="/O /O0 /O1 /O2 /O3 /Od /Og /Og- /Oi /Oi-"
flags_opt_yes="/O2"
flags_opt_off="/Od"
fi
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_LCC
dnl -------------------------------------------------
dnl Verify if compiler being used is LCC.
AC_DEFUN([CURL_CHECK_COMPILER_LCC], [
AC_MSG_CHECKING([if compiler is LCC])
CURL_CHECK_DEF([__LCC__], [], [silent])
if test "$curl_cv_have_def___LCC__" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="LCC"
flags_dbg_all="-g"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all=""
flags_opt_yes=""
flags_opt_off=""
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_SGI_MIPS_C
dnl -------------------------------------------------
dnl Verify if compiler being used is SGI MIPS C.
AC_DEFUN([CURL_CHECK_COMPILER_SGI_MIPS_C], [
AC_REQUIRE([CURL_CHECK_COMPILER_SGI_MIPSPRO_C])dnl
AC_MSG_CHECKING([if compiler is SGI MIPS C])
CURL_CHECK_DEF([__GNUC__], [], [silent])
CURL_CHECK_DEF([__sgi], [], [silent])
if test "$curl_cv_have_def___GNUC__" = "no" &&
test "$curl_cv_have_def___sgi" = "yes" &&
test "$compiler_id" = "unknown"; then
AC_MSG_RESULT([yes])
compiler_id="SGI_MIPS_C"
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -Ofast"
flags_opt_yes="-O2"
flags_opt_off="-O0"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_SGI_MIPSPRO_C
dnl -------------------------------------------------
dnl Verify if compiler being used is SGI MIPSpro C.
AC_DEFUN([CURL_CHECK_COMPILER_SGI_MIPSPRO_C], [
AC_BEFORE([$0],[CURL_CHECK_COMPILER_SGI_MIPS_C])dnl
AC_MSG_CHECKING([if compiler is SGI MIPSpro C])
CURL_CHECK_DEF([__GNUC__], [], [silent])
CURL_CHECK_DEF([_COMPILER_VERSION], [], [silent])
CURL_CHECK_DEF([_SGI_COMPILER_VERSION], [], [silent])
if test "$curl_cv_have_def___GNUC__" = "no" &&
(test "$curl_cv_have_def__SGI_COMPILER_VERSION" = "yes" ||
test "$curl_cv_have_def__COMPILER_VERSION" = "yes"); then
AC_MSG_RESULT([yes])
compiler_id="SGI_MIPSPRO_C"
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -Ofast"
flags_opt_yes="-O2"
flags_opt_off="-O0"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_SUNPRO_C
dnl -------------------------------------------------
dnl Verify if compiler being used is SunPro C.
AC_DEFUN([CURL_CHECK_COMPILER_SUNPRO_C], [
AC_MSG_CHECKING([if compiler is SunPro C])
CURL_CHECK_DEF([__SUNPRO_C], [], [silent])
if test "$curl_cv_have_def___SUNPRO_C" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="SUNPRO_C"
flags_dbg_all="-g -s"
flags_dbg_yes="-g"
flags_dbg_off="-s"
flags_opt_all="-O -xO -xO1 -xO2 -xO3 -xO4 -xO5"
flags_opt_yes="-xO2"
flags_opt_off=""
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_TINY_C
dnl -------------------------------------------------
dnl Verify if compiler being used is Tiny C.
AC_DEFUN([CURL_CHECK_COMPILER_TINY_C], [
AC_MSG_CHECKING([if compiler is Tiny C])
CURL_CHECK_DEF([__TINYC__], [], [silent])
if test "$curl_cv_have_def___TINYC__" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="TINY_C"
flags_dbg_all="-g -b"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all=""
flags_opt_yes=""
flags_opt_off=""
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_WATCOM_C
dnl -------------------------------------------------
dnl Verify if compiler being used is Watcom C.
AC_DEFUN([CURL_CHECK_COMPILER_WATCOM_C], [
AC_MSG_CHECKING([if compiler is Watcom C])
CURL_CHECK_DEF([__WATCOMC__], [], [silent])
if test "$curl_cv_have_def___WATCOMC__" = "yes"; then
AC_MSG_RESULT([yes])
CURL_CHECK_DEF([__UNIX__], [], [silent])
if test "$curl_cv_have_def___UNIX__" = "yes"; then
compiler_id="WATCOM_UNIX_C"
flags_dbg_all="-g1 -g1+ -g2 -g3"
flags_dbg_yes="-g2"
flags_dbg_off=""
flags_opt_all="-O0 -O1 -O2 -O3"
flags_opt_yes="-O2"
flags_opt_off="-O0"
else
compiler_id="WATCOM_WINDOWS_C"
flags_dbg_all=""
flags_dbg_yes=""
flags_dbg_off=""
flags_opt_all=""
flags_opt_yes=""
flags_opt_off=""
fi
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CONVERT_INCLUDE_TO_ISYSTEM
dnl -------------------------------------------------
dnl Changes standard include paths present in CFLAGS
dnl and CPPFLAGS into isystem include paths. This is
dnl done to prevent GNUC from generating warnings on
dnl headers from these locations, although on ancient
dnl GNUC versions these warnings are not silenced.
AC_DEFUN([CURL_CONVERT_INCLUDE_TO_ISYSTEM], [
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_MSG_CHECKING([convert -I options to -isystem])
if test "$compiler_id" = "GNU_C" ||
test "$compiler_id" = "CLANG"; then
AC_MSG_RESULT([yes])
tmp_has_include="no"
tmp_chg_FLAGS="$CFLAGS"
for word1 in $tmp_chg_FLAGS; do
case "$word1" in
-I*)
tmp_has_include="yes"
;;
esac
done
if test "$tmp_has_include" = "yes"; then
tmp_chg_FLAGS=`echo "$tmp_chg_FLAGS" | "$SED" 's/^-I/ -isystem /g'`
tmp_chg_FLAGS=`echo "$tmp_chg_FLAGS" | "$SED" 's/ -I/ -isystem /g'`
CFLAGS="$tmp_chg_FLAGS"
squeeze CFLAGS
fi
tmp_has_include="no"
tmp_chg_FLAGS="$CPPFLAGS"
for word1 in $tmp_chg_FLAGS; do
case "$word1" in
-I*)
tmp_has_include="yes"
;;
esac
done
if test "$tmp_has_include" = "yes"; then
tmp_chg_FLAGS=`echo "$tmp_chg_FLAGS" | "$SED" 's/^-I/ -isystem /g'`
tmp_chg_FLAGS=`echo "$tmp_chg_FLAGS" | "$SED" 's/ -I/ -isystem /g'`
CPPFLAGS="$tmp_chg_FLAGS"
squeeze CPPFLAGS
fi
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_COMPILER_WORKS_IFELSE ([ACTION-IF-WORKS], [ACTION-IF-NOT-WORKS])
dnl -------------------------------------------------
dnl Verify if the C compiler seems to work with the
dnl settings that are 'active' at the time the test
dnl is performed.
AC_DEFUN([CURL_COMPILER_WORKS_IFELSE], [
dnl compilation capability verification
tmp_compiler_works="unknown"
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
]],[[
int i = 1;
return i;
]])
],[
tmp_compiler_works="yes"
],[
tmp_compiler_works="no"
echo " " >&6
sed 's/^/cc-fail: /' conftest.err >&6
echo " " >&6
])
dnl linking capability verification
if test "$tmp_compiler_works" = "yes"; then
AC_LINK_IFELSE([
AC_LANG_PROGRAM([[
]],[[
int i = 1;
return i;
]])
],[
tmp_compiler_works="yes"
],[
tmp_compiler_works="no"
echo " " >&6
sed 's/^/link-fail: /' conftest.err >&6
echo " " >&6
])
fi
dnl only do runtime verification when not cross-compiling
if test "x$cross_compiling" != "xyes" &&
test "$tmp_compiler_works" = "yes"; then
CURL_RUN_IFELSE([
AC_LANG_PROGRAM([[
# ifdef __STDC__
# include <stdlib.h>
# endif
]],[[
int i = 0;
exit(i);
]])
],[
tmp_compiler_works="yes"
],[
tmp_compiler_works="no"
echo " " >&6
echo "run-fail: test program exited with status $ac_status" >&6
echo " " >&6
])
fi
dnl branch upon test result
if test "$tmp_compiler_works" = "yes"; then
ifelse($1,,:,[$1])
ifelse($2,,,[else
$2])
fi
])
dnl CURL_SET_COMPILER_BASIC_OPTS
dnl -------------------------------------------------
dnl Sets compiler specific options/flags which do not
dnl depend on configure's debug, optimize or warnings
dnl options.
AC_DEFUN([CURL_SET_COMPILER_BASIC_OPTS], [
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
#
if test "$compiler_id" != "unknown"; then
#
tmp_save_CPPFLAGS="$CPPFLAGS"
tmp_save_CFLAGS="$CFLAGS"
tmp_CPPFLAGS=""
tmp_CFLAGS=""
#
case "$compiler_id" in
#
CLANG)
#
dnl Disable warnings for unused arguments, otherwise clang will
dnl warn about compile-time arguments used during link-time, like
dnl -O and -g and -pedantic.
tmp_CFLAGS="$tmp_CFLAGS -Qunused-arguments"
;;
#
DEC_C)
#
dnl Select strict ANSI C compiler mode
tmp_CFLAGS="$tmp_CFLAGS -std1"
dnl Turn off optimizer ANSI C aliasing rules
tmp_CFLAGS="$tmp_CFLAGS -noansi_alias"
dnl Generate warnings for missing function prototypes
tmp_CFLAGS="$tmp_CFLAGS -warnprotos"
dnl Change some warnings into fatal errors
tmp_CFLAGS="$tmp_CFLAGS -msg_fatal toofewargs,toomanyargs"
;;
#
GNU_C)
#
dnl turn implicit-function-declaration warning into error,
dnl at least gcc 2.95 and later support this
if test "$compiler_num" -ge "295"; then
tmp_CFLAGS="$tmp_CFLAGS -Werror-implicit-function-declaration"
fi
;;
#
HP_UX_C)
#
dnl Disallow run-time dereferencing of null pointers
tmp_CFLAGS="$tmp_CFLAGS -z"
dnl Disable some remarks
dnl #4227: padding struct with n bytes to align member
dnl #4255: padding size of struct with n bytes to alignment boundary
tmp_CFLAGS="$tmp_CFLAGS +W 4227,4255"
;;
#
IBM_C)
#
dnl Ensure that compiler optimizations are always thread-safe.
tmp_CPPFLAGS="$tmp_CPPFLAGS -qthreaded"
dnl Disable type based strict aliasing optimizations, using worst
dnl case aliasing assumptions when compiling. Type based aliasing
dnl would restrict the lvalues that could be safely used to access
dnl a data object.
tmp_CPPFLAGS="$tmp_CPPFLAGS -qnoansialias"
dnl Force compiler to stop after the compilation phase, without
dnl generating an object code file when compilation has errors.
tmp_CPPFLAGS="$tmp_CPPFLAGS -qhalt=e"
;;
#
INTEL_UNIX_C)
#
dnl On unix this compiler uses gcc's header files, so
dnl we select ANSI C89 dialect plus GNU extensions.
tmp_CFLAGS="$tmp_CFLAGS -std=gnu89"
dnl Change some warnings into errors
dnl #140: too many arguments in function call
dnl #147: declaration is incompatible with 'previous one'
dnl #165: too few arguments in function call
dnl #266: function declared implicitly
tmp_CPPFLAGS="$tmp_CPPFLAGS -we140,147,165,266"
dnl Disable some remarks
dnl #279: controlling expression is constant
dnl #981: operands are evaluated in unspecified order
dnl #1469: "cc" clobber ignored
tmp_CPPFLAGS="$tmp_CPPFLAGS -wd279,981,1469"
;;
#
INTEL_WINDOWS_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
LCC)
#
dnl Disallow run-time dereferencing of null pointers
tmp_CFLAGS="$tmp_CFLAGS -n"
;;
#
SGI_MIPS_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
SGI_MIPSPRO_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
SUNPRO_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
TINY_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
WATCOM_UNIX_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
WATCOM_WINDOWS_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
esac
#
squeeze tmp_CPPFLAGS
squeeze tmp_CFLAGS
#
if test ! -z "$tmp_CFLAGS" || test ! -z "$tmp_CPPFLAGS"; then
AC_MSG_CHECKING([if compiler accepts some basic options])
CPPFLAGS="$tmp_save_CPPFLAGS $tmp_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS $tmp_CFLAGS"
squeeze CPPFLAGS
squeeze CFLAGS
CURL_COMPILER_WORKS_IFELSE([
AC_MSG_RESULT([yes])
AC_MSG_NOTICE([compiler options added: $tmp_CFLAGS $tmp_CPPFLAGS])
],[
AC_MSG_RESULT([no])
AC_MSG_WARN([compiler options rejected: $tmp_CFLAGS $tmp_CPPFLAGS])
dnl restore initial settings
CPPFLAGS="$tmp_save_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS"
])
fi
#
fi
])
dnl CURL_SET_COMPILER_DEBUG_OPTS
dnl -------------------------------------------------
dnl Sets compiler specific options/flags which depend
dnl on configure's debug option.
AC_DEFUN([CURL_SET_COMPILER_DEBUG_OPTS], [
AC_REQUIRE([CURL_CHECK_OPTION_DEBUG])dnl
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
#
if test "$compiler_id" != "unknown"; then
#
tmp_save_CFLAGS="$CFLAGS"
tmp_save_CPPFLAGS="$CPPFLAGS"
#
tmp_options=""
tmp_CFLAGS="$CFLAGS"
tmp_CPPFLAGS="$CPPFLAGS"
CURL_VAR_STRIP([tmp_CFLAGS],[$flags_dbg_all])
CURL_VAR_STRIP([tmp_CPPFLAGS],[$flags_dbg_all])
#
if test "$want_debug" = "yes"; then
AC_MSG_CHECKING([if compiler accepts debug enabling options])
tmp_options="$flags_dbg_yes"
fi
if test "$want_debug" = "no"; then
AC_MSG_CHECKING([if compiler accepts debug disabling options])
tmp_options="$flags_dbg_off"
fi
#
if test "$flags_prefer_cppflags" = "yes"; then
CPPFLAGS="$tmp_CPPFLAGS $tmp_options"
CFLAGS="$tmp_CFLAGS"
else
CPPFLAGS="$tmp_CPPFLAGS"
CFLAGS="$tmp_CFLAGS $tmp_options"
fi
squeeze CPPFLAGS
squeeze CFLAGS
CURL_COMPILER_WORKS_IFELSE([
AC_MSG_RESULT([yes])
AC_MSG_NOTICE([compiler options added: $tmp_options])
],[
AC_MSG_RESULT([no])
AC_MSG_WARN([compiler options rejected: $tmp_options])
dnl restore initial settings
CPPFLAGS="$tmp_save_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS"
])
#
fi
])
dnl CURL_SET_COMPILER_OPTIMIZE_OPTS
dnl -------------------------------------------------
dnl Sets compiler specific options/flags which depend
dnl on configure's optimize option.
AC_DEFUN([CURL_SET_COMPILER_OPTIMIZE_OPTS], [
AC_REQUIRE([CURL_CHECK_OPTION_OPTIMIZE])dnl
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
#
if test "$compiler_id" != "unknown"; then
#
tmp_save_CFLAGS="$CFLAGS"
tmp_save_CPPFLAGS="$CPPFLAGS"
#
tmp_options=""
tmp_CFLAGS="$CFLAGS"
tmp_CPPFLAGS="$CPPFLAGS"
honor_optimize_option="yes"
#
dnl If optimization request setting has not been explicitly specified,
dnl it has been derived from the debug setting and initially assumed.
dnl This initially assumed optimizer setting will finally be ignored
dnl if CFLAGS or CPPFLAGS already hold optimizer flags. This implies
dnl that an initially assumed optimizer setting might not be honored.
#
if test "$want_optimize" = "assume_no" ||
test "$want_optimize" = "assume_yes"; then
AC_MSG_CHECKING([if compiler optimizer assumed setting might be used])
CURL_VAR_MATCH_IFELSE([tmp_CFLAGS],[$flags_opt_all],[
honor_optimize_option="no"
])
CURL_VAR_MATCH_IFELSE([tmp_CPPFLAGS],[$flags_opt_all],[
honor_optimize_option="no"
])
AC_MSG_RESULT([$honor_optimize_option])
if test "$honor_optimize_option" = "yes"; then
if test "$want_optimize" = "assume_yes"; then
want_optimize="yes"
fi
if test "$want_optimize" = "assume_no"; then
want_optimize="no"
fi
fi
fi
#
if test "$honor_optimize_option" = "yes"; then
CURL_VAR_STRIP([tmp_CFLAGS],[$flags_opt_all])
CURL_VAR_STRIP([tmp_CPPFLAGS],[$flags_opt_all])
if test "$want_optimize" = "yes"; then
AC_MSG_CHECKING([if compiler accepts optimizer enabling options])
tmp_options="$flags_opt_yes"
fi
if test "$want_optimize" = "no"; then
AC_MSG_CHECKING([if compiler accepts optimizer disabling options])
tmp_options="$flags_opt_off"
fi
if test "$flags_prefer_cppflags" = "yes"; then
CPPFLAGS="$tmp_CPPFLAGS $tmp_options"
CFLAGS="$tmp_CFLAGS"
else
CPPFLAGS="$tmp_CPPFLAGS"
CFLAGS="$tmp_CFLAGS $tmp_options"
fi
squeeze CPPFLAGS
squeeze CFLAGS
CURL_COMPILER_WORKS_IFELSE([
AC_MSG_RESULT([yes])
AC_MSG_NOTICE([compiler options added: $tmp_options])
],[
AC_MSG_RESULT([no])
AC_MSG_WARN([compiler options rejected: $tmp_options])
dnl restore initial settings
CPPFLAGS="$tmp_save_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS"
])
fi
#
fi
])
dnl CURL_SET_COMPILER_WARNING_OPTS
dnl -------------------------------------------------
dnl Sets compiler options/flags which depend on
dnl configure's warnings given option.
AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
AC_REQUIRE([CURL_CHECK_OPTION_WARNINGS])dnl
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
#
if test "$compiler_id" != "unknown"; then
#
tmp_save_CPPFLAGS="$CPPFLAGS"
tmp_save_CFLAGS="$CFLAGS"
tmp_CPPFLAGS=""
tmp_CFLAGS=""
#
case "$compiler_id" in
#
CLANG)
#
if test "$want_warnings" = "yes"; then
tmp_CFLAGS="$tmp_CFLAGS -pedantic"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [all extra])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [pointer-arith write-strings])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [shadow])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [inline nested-externs])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-declarations])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-prototypes])
tmp_CFLAGS="$tmp_CFLAGS -Wno-long-long"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [float-equal])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [no-multichar sign-compare])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [undef])
tmp_CFLAGS="$tmp_CFLAGS -Wno-format-nonliteral"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [endif-labels strict-prototypes])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [declaration-after-statement])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [cast-align])
tmp_CFLAGS="$tmp_CFLAGS -Wno-system-headers"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [shorten-64-to-32])
#
dnl Only clang 1.1 or later
if test "$compiler_num" -ge "101"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [unused])
fi
#
dnl Only clang 2.8 or later
if test "$compiler_num" -ge "208"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [vla])
fi
#
dnl Only clang 2.9 or later
if test "$compiler_num" -ge "209"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [shift-sign-overflow])
fi
#
dnl Only clang 3.2 or later
if test "$compiler_num" -ge "302"; then
case $host_os in
cygwin* | mingw*)
dnl skip missing-variable-declarations warnings for cygwin and
dnl mingw because the libtool wrapper executable causes them
;;
*)
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-variable-declarations])
;;
esac
fi
#
dnl Only clang 3.6 or later
if test "$compiler_num" -ge "306"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [double-promotion])
fi
#
dnl Only clang 3.9 or later
if test "$compiler_num" -ge "309"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [comma])
# avoid the varargs warning, fixed in 4.0
# https://bugs.llvm.org/show_bug.cgi?id=29140
if test "$compiler_num" -lt "400"; then
tmp_CFLAGS="$tmp_CFLAGS -Wno-varargs"
fi
fi
dnl clang 7 or later
if test "$compiler_num" -ge "700"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [assign-enum])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [extra-semi-stmt])
fi
fi
;;
#
DEC_C)
#
if test "$want_warnings" = "yes"; then
dnl Select a higher warning level than default level2
tmp_CFLAGS="$tmp_CFLAGS -msg_enable level3"
fi
;;
#
GNU_C)
#
if test "$want_warnings" = "yes"; then
#
dnl Do not enable -pedantic when cross-compiling with a gcc older
dnl than 3.0, to avoid warnings from third party system headers.
if test "x$cross_compiling" != "xyes" ||
test "$compiler_num" -ge "300"; then
tmp_CFLAGS="$tmp_CFLAGS -pedantic"
fi
#
dnl Set of options we believe *ALL* gcc versions support:
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [all])
tmp_CFLAGS="$tmp_CFLAGS -W"
#
dnl Only gcc 1.4 or later
if test "$compiler_num" -ge "104"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [pointer-arith write-strings])
dnl If not cross-compiling with a gcc older than 3.0
if test "x$cross_compiling" != "xyes" ||
test "$compiler_num" -ge "300"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [unused shadow])
fi
fi
#
dnl Only gcc 2.7 or later
if test "$compiler_num" -ge "207"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [inline nested-externs])
dnl If not cross-compiling with a gcc older than 3.0
if test "x$cross_compiling" != "xyes" ||
test "$compiler_num" -ge "300"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-declarations])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-prototypes])
fi
fi
#
dnl Only gcc 2.95 or later