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m4: add NM_COMPILER_WARNING_FLAG() macro

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We used

  COMPILER_FLAG(LIBSYSTEMD_NM_CFLAGS, "-Wno-gnu-variable-sized-type-not-at-end")

to detect whether the flag is supported. However, that does not work with GCC since
version 4.4 due to https://gcc.gnu.org/wiki/FAQ#wnowarning.

Note that we already had NM_COMPILER_WARNING(), but that again does
something rather different.
This commit is contained in:
Thomas Haller 2022-08-11 10:56:59 +02:00
parent 3117198f15
commit 119d30145e
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1 changed files with 9 additions and 0 deletions
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9
m4/compiler_options.m4
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@ -29,8 +29,17 @@ AC_DEFUN([NM_COMPILER_FLAG], [
], [$4])
])
dnl Check whether a particular warning is supported. If yes, the flag
dnl is appended to [ENV-VAR].
dnl NM_COMPILER_WARNING_FLAG([ENV-VAR], [WARNING])
AC_DEFUN([NM_COMPILER_WARNING_FLAG], [
dnl "-Wno-*" requires special handling, see https://gcc.gnu.org/wiki/FAQ#wnowarning.
_NM_COMPILER_FLAG([-Wall $(printf '%s' "$2" | sed -e 's/^-W\(no-\|no-error=\)/-W/')], [], [eval "AS_TR_SH([$1])='$$1 $2'"], [])
])
dnl Check whether a particular warning is not emitted with code provided,
dnl append an option to disable the warning to a specified variable if the check fails.
dnl Note that this always either adds -W$2 or -Wno-$2, depending on whether it's supported.
dnl NM_COMPILER_WARNING([ENV-VAR], [WARNING], [C-SNIPPET])
AC_DEFUN([NM_COMPILER_WARNING], [
_NM_COMPILER_FLAG([-W$2], [$3], [eval "AS_TR_SH([$1])='$$1 -W$2'"], [eval "AS_TR_SH([$1])='$$1 -Wno-$2'"])