[PATCH libdrm 1/7] meson, configure: add warning when using undefined preprocessor tokens

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Signed-off-by: Eric Engestrom <eric.engestrom@xxxxxxxxxx>
---
 configure.ac | 2 +-
 meson.build  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 35378b3384290f8e1e26..3fc4e7794cd974171c0a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -197,7 +197,7 @@ dnl skipped and all flags rechecked.  So there's no need to do anything
 dnl else.  If for any reason you need to force a recheck, just change
 dnl MAYBE_WARN in an ignorable way (like adding whitespace)
 
-MAYBE_WARN="-Wall -Wextra \
+MAYBE_WARN="-Wall -Wextra -Wundef \
 -Wsign-compare -Werror-implicit-function-declaration \
 -Wpointer-arith -Wwrite-strings -Wstrict-prototypes \
 -Wmissing-prototypes -Wmissing-declarations -Wnested-externs \
diff --git a/meson.build b/meson.build
index d7a50cf96f905b53d37a..a410627fbf16a2c6d748 100644
--- a/meson.build
+++ b/meson.build
@@ -203,7 +203,7 @@ if cc.has_function('open_memstream')
 endif
 
 warn_c_args = []
-foreach a : ['-Wall', '-Wextra', '-Wsign-compare', 
+foreach a : ['-Wall', '-Wextra', '-Wsign-compare', '-Wundef',
              '-Werror-implicit-function-declaration', '-Wpointer-arith',
              '-Wwrite-strings', '-Wstrict-prototypes', '-Wmissing-prototypes',
              '-Wmissing-declarations', '-Wnested-externs', '-Wpacked',
-- 
Cheers,
  Eric

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