mirror of https://github.com/nirenjan/libx52.git
112 lines
4.1 KiB
Plaintext
112 lines
4.1 KiB
Plaintext
# ==============================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_ldflags.html
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# ==============================================================================
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#
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# SYNOPSIS
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#
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# AX_COMPILER_FLAGS_LDFLAGS([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
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#
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# DESCRIPTION
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#
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# Add warning flags for the linker to VARIABLE, which defaults to
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# WARN_LDFLAGS. VARIABLE is AC_SUBST-ed by this macro, but must be
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# manually added to the LDFLAGS variable for each target in the code base.
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#
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# This macro depends on the environment set up by AX_COMPILER_FLAGS.
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# Specifically, it uses the value of $ax_enable_compile_warnings to decide
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# which flags to enable.
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#
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# LICENSE
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#
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# Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk>
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# Copyright (c) 2017, 2018 Reini Urban <rurban@cpan.org>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 9
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AC_DEFUN([AX_COMPILER_FLAGS_LDFLAGS],[
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AX_REQUIRE_DEFINED([AX_APPEND_LINK_FLAGS])
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AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
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AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
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AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
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# Variable names
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m4_define([ax_warn_ldflags_variable],
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[m4_normalize(ifelse([$1],,[WARN_LDFLAGS],[$1]))])
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# Always pass -Werror=unknown-warning-option to get Clang to fail on bad
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# flags, otherwise they are always appended to the warn_ldflags variable,
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# and Clang warns on them for every compilation unit.
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# If this is passed to GCC, it will explode, so the flag must be enabled
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# conditionally.
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AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
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ax_compiler_flags_test="-Werror=unknown-warning-option"
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],[
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ax_compiler_flags_test=""
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])
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AX_CHECK_LINK_FLAG([-Wl,--as-needed], [
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AX_APPEND_LINK_FLAGS([-Wl,--as-needed],
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[AM_LDFLAGS],[$ax_compiler_flags_test])
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])
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AX_CHECK_LINK_FLAG([-Wl,-z,relro], [
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AX_APPEND_LINK_FLAGS([-Wl,-z,relro],
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[AM_LDFLAGS],[$ax_compiler_flags_test])
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])
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AX_CHECK_LINK_FLAG([-Wl,-z,now], [
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AX_APPEND_LINK_FLAGS([-Wl,-z,now],
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[AM_LDFLAGS],[$ax_compiler_flags_test])
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])
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AX_CHECK_LINK_FLAG([-Wl,-z,noexecstack], [
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AX_APPEND_LINK_FLAGS([-Wl,-z,noexecstack],
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[AM_LDFLAGS],[$ax_compiler_flags_test])
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])
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# textonly, retpolineplt not yet
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# macOS and cygwin linker do not have --as-needed
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AX_CHECK_LINK_FLAG([-Wl,--no-as-needed], [
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ax_compiler_flags_as_needed_option="-Wl,--no-as-needed"
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], [
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ax_compiler_flags_as_needed_option=""
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])
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# macOS linker speaks with a different accent
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ax_compiler_flags_fatal_warnings_option=""
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AX_CHECK_LINK_FLAG([-Wl,--fatal-warnings], [
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ax_compiler_flags_fatal_warnings_option="-Wl,--fatal-warnings"
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])
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AX_CHECK_LINK_FLAG([-Wl,-fatal_warnings], [
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ax_compiler_flags_fatal_warnings_option="-Wl,-fatal_warnings"
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])
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# Base flags
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AX_APPEND_LINK_FLAGS([ dnl
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$ax_compiler_flags_as_needed_option dnl
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$3 dnl
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],ax_warn_ldflags_variable,[$ax_compiler_flags_test])
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AS_IF([test "$ax_enable_compile_warnings" != "no"],[
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# "yes" flags
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AX_APPEND_LINK_FLAGS([$4 $5 $6 $7],
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ax_warn_ldflags_variable,
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[$ax_compiler_flags_test])
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])
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AS_IF([test "$ax_enable_compile_warnings" = "error"],[
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# "error" flags; -Werror has to be appended unconditionally because
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# it's not possible to test for
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#
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# suggest-attribute=format is disabled because it gives too many false
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# positives
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AX_APPEND_LINK_FLAGS([ dnl
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$ax_compiler_flags_fatal_warnings_option dnl
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],ax_warn_ldflags_variable,[$ax_compiler_flags_test])
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])
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# Substitute the variables
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AC_SUBST(ax_warn_ldflags_variable)
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])dnl AX_COMPILER_FLAGS
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