Makefile.am: don't confuse CFLAGS and CFLAGS_FOR_BUILD

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>

1 files changed, 7 insertions, 0 deletions

diff --git a/m4/ax_prog_cc_for_build.m4 b/m4/ax_prog_cc_for_build.m4
index 114c9e759..9fddbf647 100644
--- a/m4/ax_prog_cc_for_build.m4
+++ b/m4/ax_prog_cc_for_build.m4
@@ -62,6 +62,7 @@ pushdef([CPP], CPP_FOR_BUILD)dnl
 pushdef([CFLAGS], CFLAGS_FOR_BUILD)dnl
 pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl
 pushdef([LDFLAGS], LDFLAGS_FOR_BUILD)dnl
+pushdef([WARN_CFLAGS], WARN_CFLAGS_FOR_BUILD)dnl
 pushdef([host], build)dnl
 pushdef([host_alias], build_alias)dnl
 pushdef([host_cpu], build_cpu)dnl
@@ -74,6 +75,7 @@ pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
 pushdef([ac_cv_host_os], ac_cv_build_os)dnl
 pushdef([am_cv_prog_cc_c_o], am_cv_build_prog_cc_c_o)dnl
 pushdef([am_cv_CC_dependencies_compiler_type], am_cv_build_CC_dependencies_compiler_type)dnl
+pushdef([gl_unknown_warnings_are_errors], gl_build_unknown_warnings_are_errors)dnl
 
 st_SAVE_VAR([ac_c_decl_warn_flag])
 st_SAVE_VAR([ac_c_preproc_warn_flag])
@@ -93,6 +95,8 @@ AC_PROG_CC
 AC_PROG_CPP
 AC_EXEEXT
 
+st_WARN_CFLAGS
+
 st_RESTORE_VAR([cross_compiling])
 st_RESTORE_VAR([ac_tool_prefix])
 st_RESTORE_VAR([ac_link])
@@ -107,6 +111,7 @@ st_RESTORE_VAR([ac_c_decl_warn_flag])
 
 dnl Restore the old definitions
 dnl
+popdef([gl_unknown_warnings_are_errors])dnl
 popdef([am_cv_CC_dependencies_compiler_type])dnl
 popdef([am_cv_prog_cc_c_o])dnl
 popdef([ac_cv_host_os])dnl
@@ -119,6 +124,7 @@ popdef([host_vendor])dnl
 popdef([host_cpu])dnl
 popdef([host_alias])dnl
 popdef([host])dnl
+popdef([WARN_CFLAGS])dnl
 popdef([LDFLAGS])dnl
 popdef([CPPFLAGS])dnl
 popdef([CFLAGS])dnl
@@ -147,4 +153,5 @@ AC_SUBST(BUILD_OBJEXT)dnl
 AC_SUBST([CFLAGS_FOR_BUILD])dnl
 AC_SUBST([CPPFLAGS_FOR_BUILD])dnl
 AC_SUBST([LDFLAGS_FOR_BUILD])dnl
+AC_SUBST([WARN_CFLAGS_FOR_BUILD])dnl
 ])