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Fixed m4/cf3_gcc_flags.m4 to actually test compiler flags #286

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Fixed m4/cf3_gcc_flags.m4 to actually test compiler flags #286

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0ff45ab
Fixed m4/cf3_gcc_flags.m4 to actually test compiler flags
craigcomstock Jul 29, 2026
a90a9e0
bump copyright year in m4/cf3_gcc_flags.m4
craigcomstock Jul 29, 2026
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11 changes: 10 additions & 1 deletion m4/cf3_gcc_flags.m4
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
#
# Copyright 2021 Northern.tech AS
# Copyright 2026 Northern.tech AS
#
# This file is part of CFEngine 3 - written and maintained by Northern.tech AS.
#
Expand Down Expand Up @@ -47,25 +47,31 @@ if test x"$GCC" = "xyes" && test x"$HP_UX_AC" != x"yes"; then
CF3_CFLAGS="$CF3_CFLAGS -std=gnu99 -g -Wall"
AC_MSG_RESULT(yes)

dnl Save CFLAGS to restore after using it to test for compiler flag support
save_CFLAGS="$CFLAGS"
AC_MSG_CHECKING(for -Wno-pointer-sign)
CFLAGS="-Wno-pointer-sign"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([int main() {}])],
[AC_MSG_RESULT(yes)
CF3_CFLAGS="$CF3_CFLAGS -Wno-pointer-sign"],
[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for -Werror=implicit-function-declaration)
CFLAGS="-Werror=implicit-function-declaration"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([int main() {}])],
[AC_MSG_RESULT(yes)
CF3_CFLAGS="$CF3_CFLAGS -Werror=implicit-function-declaration"],
[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for -Wunused-parameter)
CFLAGS="-Wunused-parameter"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([int main() {}])],
[AC_MSG_RESULT(yes)
CF3_CFLAGS="$CF3_CFLAGS -Wunused-parameter"],
[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for -Wno-incompatible-pointer-types)
CFLAGS="-Wno-incompatible-pointer-types"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([int main() {}])],
[AC_MSG_RESULT(yes)
CF3_CFLAGS="$CF3_CFLAGS -Wno-incompatible-pointer-types"],
Expand All @@ -78,6 +84,7 @@ if test x"$GCC" = "xyes" && test x"$HP_UX_AC" != x"yes"; then
dnl GCC irregularities checking for -Wno-* command-line options
dnl (command line is not fully checked until actual warning occurs)
AC_MSG_CHECKING(for -Wno-duplicate-decl-specifier)
CFLAGS="-Wno-duplicate-decl-specifier"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([#ifndef __clang__
# error Not a clang
#endif
Expand All @@ -90,3 +97,5 @@ else
fi

AC_SUBST([CF3_CFLAGS])
dnl restore CFLAGS
CFLAGS="$save_CFLAGS"
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