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add include guards

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alleviate risks of double inclusion (typically via transitive includes)
This commit is contained in:
Yann Collet
2023-08-27 16:12:06 -07:00
parent 1ec201c7b9
commit b69d06a810
1 changed files with 6 additions and 0 deletions
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6
lib/libzstd.mk
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@@ -8,6 +8,10 @@
# You may select, at your option, one of the above-listed licenses.
# ################################################################
# Ensure the file is not included twice
ifndef LIBZSTD_MK_INCLUDED
LIBZSTD_MK_INCLUDED := 1
##################################################################
# Input Variables
##################################################################
@@ -223,3 +227,5 @@ endif # BUILD_DIR
ZSTD_SUBDIR := $(LIBZSTD)/common $(LIBZSTD)/compress $(LIBZSTD)/decompress $(LIBZSTD)/dictBuilder $(LIBZSTD)/legacy $(LIBZSTD)/deprecated
vpath %.c $(ZSTD_SUBDIR)
vpath %.S $(ZSTD_SUBDIR)
endif # LIBZSTD_MK_INCLUDED