-# Copyright 1999-2017 Gentoo Foundation
+# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: flag-o-matic.eclass
# Return all the flag variables that our high level funcs operate on.
all-flag-vars() {
- echo {C,CPP,CXX,CCAS,F,FC,LD}FLAGS
+ echo {ADA,C,CPP,CXX,CCAS,F,FC,LD}FLAGS
}
# {C,CPP,CXX,CCAS,F,FC,LD}FLAGS that we allow in strip-flags
'-fstack-protector*' '-fsanitize*' '-fstack-check*' -fno-stack-check
-fbounds-check -fbounds-checking -fno-strict-overflow
-fno-PIE -fno-pie -nopie -no-pie -fno-unit-at-a-time
- -g '-g[0-9]' -ggdb '-ggdb[0-9]' '-gdwarf-*' gstabs -gstabs+
+ -g '-g[0-9]' -ggdb '-ggdb[0-9]' '-gdwarf-*' gstabs -gstabs+ -gz
-fno-ident -fpermissive -frecord-gcc-switches
'-fdiagnostics*' '-fplugin*'
'-W*' -w
# CPPFLAGS and LDFLAGS
'-[DUILR]*' '-Wl,*'
+
+ # Linker choice flag
+ '-fuse-ld'
)
# allow a bunch of flags that negate features / control ABI
-mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi
-mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel
-mstack-bias -mno-stack-bias -msecure-plt '-m*-toc' -mfloat-abi
- -mfix-r10000 -mno-fix-r10000 -mthumb -marm
+ -mfix-r4000 -mno-fix-r4000 -mfix-r4400 -mno-fix-r4400
+ -mfix-rm7000 -mno-fix-rm7000 -mfix-r10000 -mno-fix-r10000
+ -mr10k-cache-barrier -mthumb -marm
# gcc 4.5
-mno-fma4 -mno-movbe -mno-xop -mno-lwp
# gcc 4.9
-mno-avx512cd -mno-avx512er -mno-avx512f -mno-avx512pf -mno-sha
)
+
+ # Allow some safe individual flags. Should come along with the bug reference.
+ ALLOWED_FLAGS+=(
+ # Allow explicit stack realignment to run non-conformant
+ # binaries: bug #677852
+ -mstackrealign
+ )
}
# inverted filters for hardened compiler. This is trying to unpick
# Strip *FLAGS of everything except known good/safe flags. This runs over all
# flags returned by all_flag_vars().
strip-flags() {
+ [[ $# -ne 0 ]] && die "strip-flags takes no arguments"
local x y var
local ALLOWED_FLAGS
test-flag-PROG() {
local comp=$1
local lang=$2
- local flag=$3
+ shift 2
- [[ -z ${comp} || -z ${flag} ]] && return 1
+ if [[ -z ${comp} ]]; then
+ return 1
+ fi
+ if [[ -z $1 ]]; then
+ return 1
+ fi
+ # verify selected compiler exists before using it
+ comp=($(tc-get${comp}))
+ # 'comp' can already contain compiler options.
+ # 'type' needs a binary name
+ if ! type -p ${comp[0]} >/dev/null; then
+ return 1
+ fi
+
+ # Set up test file.
+ local in_src in_ext cmdline_extra=()
+ case "${lang}" in
+ # compiler/assembler only
+ c)
+ in_ext='c'
+ in_src='int main(void) { return 0; }'
+ cmdline_extra+=(-xc -c)
+ ;;
+ c++)
+ in_ext='cc'
+ in_src='int main(void) { return 0; }'
+ cmdline_extra+=(-xc++ -c)
+ ;;
+ f77)
+ in_ext='f'
+ # fixed source form
+ in_src=' end'
+ cmdline_extra+=(-xf77 -c)
+ ;;
+ f95)
+ in_ext='f90'
+ in_src='end'
+ cmdline_extra+=(-xf95 -c)
+ ;;
+
+ # C compiler/assembler/linker
+ c+ld)
+ in_ext='c'
+ in_src='int main(void) { return 0; }'
+ cmdline_extra+=(-xc)
+ ;;
+ esac
+ local test_in=${T}/test-flag.${in_ext}
+ local test_out=${T}/test-flag.exe
+
+ printf "%s\n" "${in_src}" > "${test_in}" || die "Failed to create '${test_in}'"
+
+ # Currently we rely on warning-free output of a compiler
+ # before the flag to see if a flag prduces any warnings.
+ # This has a few drawbacks:
+ # - if compiler already generates warnings we filter out
+ # every single flag: bug #712488
+ # - if user actually wants to see warnings we just strip
+ # them regardless of warnings type.
+ #
+ # We can add more selective detection of no-op flags via
+ # '-Werror=ignored-optimization-argument' and similar error options
+ # similar to what we are doing with '-Qunused-arguments'.
local cmdline=(
- $(tc-get${comp})
+ "${comp[@]}"
# Clang will warn about unknown gcc flags but exit 0.
# Need -Werror to force it to exit non-zero.
-Werror
- # Use -c so we can test the assembler as well.
- -c -o /dev/null
+ "$@"
+ # -x<lang> options need to go before first source file
+ "${cmdline_extra[@]}"
+
+ "${test_in}" -o "${test_out}"
)
- if "${cmdline[@]}" -x${lang} - </dev/null >/dev/null 2>&1 ; then
- "${cmdline[@]}" "${flag}" -x${lang} - </dev/null >/dev/null 2>&1
- else
- "${cmdline[@]}" "${flag}" -c -o /dev/null /dev/null >/dev/null 2>&1
+
+ if ! "${cmdline[@]}" &>/dev/null; then
+ # -Werror makes clang bail out on unused arguments as well;
+ # try to add -Qunused-arguments to work-around that
+ # other compilers don't support it but then, it's failure like
+ # any other
+ cmdline+=( -Qunused-arguments )
+ "${cmdline[@]}" &>/dev/null
fi
}
# @USAGE: <flag>
# @DESCRIPTION:
# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
-test-flag-CC() { test-flag-PROG "CC" c "$1"; }
+test-flag-CC() { test-flag-PROG "CC" c "$@"; }
# @FUNCTION: test-flag-CXX
# @USAGE: <flag>
# @DESCRIPTION:
# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
-test-flag-CXX() { test-flag-PROG "CXX" c++ "$1"; }
+test-flag-CXX() { test-flag-PROG "CXX" c++ "$@"; }
# @FUNCTION: test-flag-F77
# @USAGE: <flag>
# @DESCRIPTION:
# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
-test-flag-F77() { test-flag-PROG "F77" f77 "$1"; }
+test-flag-F77() { test-flag-PROG "F77" f77 "$@"; }
# @FUNCTION: test-flag-FC
# @USAGE: <flag>
# @DESCRIPTION:
# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
-test-flag-FC() { test-flag-PROG "FC" f95 "$1"; }
+test-flag-FC() { test-flag-PROG "FC" f95 "$@"; }
+
+# @FUNCTION: test-flag-CCLD
+# @USAGE: <flag>
+# @DESCRIPTION:
+# Returns shell true if <flag> is supported by the C compiler and linker, else returns shell false.
+test-flag-CCLD() { test-flag-PROG "CC" c+ld "$@"; }
test-flags-PROG() {
local comp=$1
[[ -z ${comp} ]] && return 1
- for x ; do
- test-flag-${comp} "${x}" && flags+=( "${x}" )
+ while (( $# )); do
+ case "$1" in
+ # '-B /foo': bug # 687198
+ --param|-B)
+ if test-flag-${comp} "$1" "$2"; then
+ flags+=( "$1" "$2" )
+ fi
+ shift 2
+ ;;
+ *)
+ if test-flag-${comp} "$1"; then
+ flags+=( "$1" )
+ fi
+ shift 1
+ ;;
+ esac
done
echo "${flags[*]}"
# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
test-flags-FC() { test-flags-PROG "FC" "$@"; }
+# @FUNCTION: test-flags-CCLD
+# @USAGE: <flags>
+# @DESCRIPTION:
+# Returns shell true if <flags> are supported by the C compiler and default linker, else returns shell false.
+test-flags-CCLD() { test-flags-PROG "CCLD" "$@"; }
+
# @FUNCTION: test-flags
# @USAGE: <flags>
# @DESCRIPTION:
# @DESCRIPTION:
# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
strip-unsupported-flags() {
+ [[ $# -ne 0 ]] && die "strip-unsupported-flags takes no arguments"
export CFLAGS=$(test-flags-CC ${CFLAGS})
export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
export FFLAGS=$(test-flags-F77 ${FFLAGS})
export FCFLAGS=$(test-flags-FC ${FCFLAGS})
- # note: this does not verify the linker flags but it is enough
- # to strip invalid C flags which are much more likely, #621274
- export LDFLAGS=$(test-flags-CC ${LDFLAGS})
+ export LDFLAGS=$(test-flags-CCLD ${LDFLAGS})
}
# @FUNCTION: get-flag
# @DESCRIPTION:
# Find and echo the value for a particular flag. Accepts shell globs.
get-flag() {
+ [[ $# -ne 1 ]] && die "usage: <flag>"
local f var findflag="$1"
# this code looks a little flaky but seems to work for
return 1
}
-has_m64() {
- die "${FUNCNAME}: don't use this anymore"
-}
-
-has_m32() {
- die "${FUNCNAME}: don't use this anymore"
-}
-
# @FUNCTION: replace-sparc64-flags
# @DESCRIPTION:
# Sets mcpu to v8 and uses the original value as mtune if none specified.
replace-sparc64-flags() {
+ [[ $# -ne 0 ]] && die "replace-sparc64-flags takes no arguments"
local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
# @FUNCTION: no-as-needed
# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
no-as-needed() {
+ [[ $# -ne 0 ]] && die "no-as-needed takes no arguments"
case $($(tc-getLD) -v 2>&1 </dev/null) in
*GNU*) # GNU ld
echo "-Wl,--no-as-needed" ;;
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