a3da3c32c1
Commit dc427d50d96b15c9a64d7e78d97ce4d194622a63 enabled a number of extra
warning flags through configure.ac. The configure script will determine
dynamically if CC supports these flags before adding them to WARN_CFLAGS.
ioctlsort is compiled with CC_FOR_BUILD, rather than CC. Nevertheless,
the flags passed to this compilation also include WARN_CFLAGS (through
AM_CFLAGS). This is incorrect: in a cross-compilation use case, CC
and CC_FOR_BUILD are not the same. The former is the cross-compiler,
the latter is the host compiler. Both may be of different versions
and support different warning flags.
In particular, this posed a problem when cross-compiling with a host
compiler gcc 4.1, which does not support all the new flags:
/usr/bin/gcc -DHAVE_CONFIG_H -I./linux/arm -I./linux/arm -I./linux
-I./linux -I. -I. -I/host-sysroot/usr/include -Wall -Wempty-body
-Wformat-security -Wignored-qualifiers -Winit-self -Wlogical-op
-Wmissing-parameter-type -Wnested-externs -Wold-style-declaration
-Wold-style-definition -Wsign-compare -Wtype-limits -Wwrite-strings -O2
-I/host-sysroot/usr/include -DIOCTLSORT_INC=\"ioctls_all0.h\" -c -o
ioctlsort0.o ./ioctlsort.c
cc1: error: unrecognized command line option "-Wempty-body"
cc1: error: unrecognized command line option "-Wignored-qualifiers"
cc1: error: unrecognized command line option "-Wlogical-op"
cc1: error: unrecognized command line option "-Wmissing-parameter-type"
cc1: error: unrecognized command line option "-Wold-style-declaration"
cc1: error: unrecognized command line option "-Wtype-limits"
make[2]: *** [ioctlsort0.o] Error 1
* Makefile.am (AM_CFLAGS_FOR_BUILD, AM_CPPFLAGS_FOR_BUILD): New
variables.
(ioctlsort_CPPFLAGS): Use AM_CPPFLAGS_FOR_BUILD instead of AM_CPPFLAGS.
(ioctlsort_CFLAGS): Use AM_CFLAGS_FOR_BUILD instead of AM_CFLAGS.
(ioctlsort_LDFLAGS): Use AM_LDFLAGS_FOR_BUILD instead of AM_LDFLAGS.
* m4/ax_prog_cc_for_build.m4 (AX_PROG_CC_FOR_BUILD): Redirect
WARN_CFLAGS and gl_unknown_warnings_are_errors, call st_WARN_CFLAGS,
substitute WARN_CFLAGS_FOR_BUILD.
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
158 lines
5.2 KiB
Plaintext
158 lines
5.2 KiB
Plaintext
# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_prog_cc_for_build.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_PROG_CC_FOR_BUILD
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#
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# DESCRIPTION
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#
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# This macro searches for a C compiler that generates native executables,
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# that is a C compiler that surely is not a cross-compiler. This can be
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# useful if you have to generate source code at compile-time like for
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# example GCC does.
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#
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# The macro sets the CC_FOR_BUILD and CPP_FOR_BUILD macros to anything
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# needed to compile or link (CC_FOR_BUILD) and preprocess (CPP_FOR_BUILD).
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# The value of these variables can be overridden by the user by specifying
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# a compiler with an environment variable (like you do for standard CC).
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#
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# It also sets BUILD_EXEEXT and BUILD_OBJEXT to the executable and object
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# file extensions for the build platform, and GCC_FOR_BUILD to `yes' if
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# the compiler we found is GCC. All these variables but GCC_FOR_BUILD are
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# substituted in the Makefile.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Paolo Bonzini <bonzini@gnu.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 8
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#modified for strace project
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AU_ALIAS([AC_PROG_CC_FOR_BUILD], [AX_PROG_CC_FOR_BUILD])
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AC_DEFUN([AX_PROG_CC_FOR_BUILD], [dnl
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AC_REQUIRE([AC_PROG_CC])dnl
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AC_REQUIRE([AC_PROG_CPP])dnl
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AC_REQUIRE([AC_EXEEXT])dnl
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AC_REQUIRE([AC_CANONICAL_HOST])dnl
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dnl Use the standard macros, but make them use other variable names
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dnl
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pushdef([ac_cv_prog_CPP], ac_cv_build_prog_CPP)dnl
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pushdef([ac_cv_prog_gcc], ac_cv_build_prog_gcc)dnl
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pushdef([ac_cv_prog_cc_works], ac_cv_build_prog_cc_works)dnl
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pushdef([ac_cv_prog_cc_cross], ac_cv_build_prog_cc_cross)dnl
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pushdef([ac_cv_prog_cc_g], ac_cv_build_prog_cc_g)dnl
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pushdef([ac_cv_prog_cc_stdc], ac_cv_build_prog_cc_stdc)dnl
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pushdef([ac_cv_prog_cc_c11], ac_cv_build_prog_cc_c11)dnl
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pushdef([ac_cv_prog_cc_c99], ac_cv_build_prog_cc_c99)dnl
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pushdef([ac_cv_prog_cc_c89], ac_cv_build_prog_cc_c89)dnl
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pushdef([ac_cv_exeext], ac_cv_build_exeext)dnl
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pushdef([ac_cv_objext], ac_cv_build_objext)dnl
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pushdef([ac_exeext], ac_build_exeext)dnl
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pushdef([ac_objext], ac_build_objext)dnl
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pushdef([CC], CC_FOR_BUILD)dnl
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pushdef([CPP], CPP_FOR_BUILD)dnl
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pushdef([CFLAGS], CFLAGS_FOR_BUILD)dnl
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pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl
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pushdef([LDFLAGS], LDFLAGS_FOR_BUILD)dnl
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pushdef([WARN_CFLAGS], WARN_CFLAGS_FOR_BUILD)dnl
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pushdef([host], build)dnl
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pushdef([host_alias], build_alias)dnl
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pushdef([host_cpu], build_cpu)dnl
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pushdef([host_vendor], build_vendor)dnl
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pushdef([host_os], build_os)dnl
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pushdef([ac_cv_host], ac_cv_build)dnl
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pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl
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pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl
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pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
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pushdef([ac_cv_host_os], ac_cv_build_os)dnl
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pushdef([am_cv_prog_cc_c_o], am_cv_build_prog_cc_c_o)dnl
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pushdef([am_cv_CC_dependencies_compiler_type], am_cv_build_CC_dependencies_compiler_type)dnl
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pushdef([gl_unknown_warnings_are_errors], gl_build_unknown_warnings_are_errors)dnl
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st_SAVE_VAR([ac_c_decl_warn_flag])
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st_SAVE_VAR([ac_c_preproc_warn_flag])
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st_SAVE_VAR([ac_c_werror_flag])
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st_SAVE_VAR([ac_compile])
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st_SAVE_VAR([ac_compiler_gnu])
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st_SAVE_VAR([ac_cpp])
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st_SAVE_VAR([ac_cv_c_compiler_gnu])
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st_SAVE_VAR([ac_cv_c_decl_report])
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st_SAVE_VAR([ac_link])
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st_SAVE_VAR([ac_tool_prefix])
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st_SAVE_VAR([cross_compiling])
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cross_compiling=no
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AC_MSG_NOTICE([looking for a C compiler that generates native executables])
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AC_PROG_CC
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AC_PROG_CPP
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AC_EXEEXT
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st_WARN_CFLAGS
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st_RESTORE_VAR([cross_compiling])
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st_RESTORE_VAR([ac_tool_prefix])
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st_RESTORE_VAR([ac_link])
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st_RESTORE_VAR([ac_cv_c_decl_report])
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st_RESTORE_VAR([ac_cv_c_compiler_gnu])
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st_RESTORE_VAR([ac_cpp])
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st_RESTORE_VAR([ac_compiler_gnu])
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st_RESTORE_VAR([ac_compile])
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st_RESTORE_VAR([ac_c_werror_flag])
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st_RESTORE_VAR([ac_c_preproc_warn_flag])
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st_RESTORE_VAR([ac_c_decl_warn_flag])
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dnl Restore the old definitions
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dnl
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popdef([gl_unknown_warnings_are_errors])dnl
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popdef([am_cv_CC_dependencies_compiler_type])dnl
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popdef([am_cv_prog_cc_c_o])dnl
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popdef([ac_cv_host_os])dnl
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popdef([ac_cv_host_vendor])dnl
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popdef([ac_cv_host_cpu])dnl
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popdef([ac_cv_host_alias])dnl
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popdef([ac_cv_host])dnl
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popdef([host_os])dnl
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popdef([host_vendor])dnl
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popdef([host_cpu])dnl
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popdef([host_alias])dnl
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popdef([host])dnl
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popdef([WARN_CFLAGS])dnl
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popdef([LDFLAGS])dnl
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popdef([CPPFLAGS])dnl
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popdef([CFLAGS])dnl
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popdef([CPP])dnl
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popdef([CC])dnl
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popdef([ac_objext])dnl
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popdef([ac_exeext])dnl
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popdef([ac_cv_objext])dnl
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popdef([ac_cv_exeext])dnl
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popdef([ac_cv_prog_cc_c89])dnl
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popdef([ac_cv_prog_cc_c99])dnl
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popdef([ac_cv_prog_cc_c11])dnl
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popdef([ac_cv_prog_cc_stdc])dnl
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popdef([ac_cv_prog_cc_g])dnl
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popdef([ac_cv_prog_cc_cross])dnl
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popdef([ac_cv_prog_cc_works])dnl
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popdef([ac_cv_prog_gcc])dnl
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popdef([ac_cv_prog_CPP])dnl
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dnl Finally, set Makefile variables
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dnl
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BUILD_EXEEXT=$ac_build_exeext
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BUILD_OBJEXT=$ac_build_objext
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AC_SUBST(BUILD_EXEEXT)dnl
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AC_SUBST(BUILD_OBJEXT)dnl
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AC_SUBST([CFLAGS_FOR_BUILD])dnl
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AC_SUBST([CPPFLAGS_FOR_BUILD])dnl
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AC_SUBST([LDFLAGS_FOR_BUILD])dnl
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AC_SUBST([WARN_CFLAGS_FOR_BUILD])dnl
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])
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