Makefile: add a note about the NO_MMAP setting on IRIX and IRIX64

diff --git a/Makefile b/Makefile
index c956ce9437ed59ff5309e8bb3cb48d935ef2f51a..532be9dd9a75660377ee3c5c5977259798a2e8f5 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -841,6 +841,12 @@ ifeq ($(uname_S),IRIX)
        NO_MEMMEM = YesPlease
        NO_MKSTEMPS = YesPlease
        NO_MKDTEMP = YesPlease
+       # When compiled with the MIPSpro 7.4.4m compiler, and without pthreads
+       # (i.e. NO_PTHREADS is set), and _with_ MMAP (i.e. NO_MMAP is not set),
+       # git dies with a segmentation fault when trying to access the first
+       # entry of a reflog.  The conservative choice is made to always set
+       # NO_MMAP.  If you suspect that your compiler is not affected by this
+       # issue, comment out the NO_MMAP statement.
        NO_MMAP = YesPlease
        NO_EXTERNAL_GREP = UnfortunatelyYes
        SNPRINTF_RETURNS_BOGUS = YesPlease
@@ -855,6 +861,12 @@ ifeq ($(uname_S),IRIX64)
        NO_MEMMEM = YesPlease
        NO_MKSTEMPS = YesPlease
        NO_MKDTEMP = YesPlease
+       # When compiled with the MIPSpro 7.4.4m compiler, and without pthreads
+       # (i.e. NO_PTHREADS is set), and _with_ MMAP (i.e. NO_MMAP is not set),
+       # git dies with a segmentation fault when trying to access the first
+       # entry of a reflog.  The conservative choice is made to always set
+       # NO_MMAP.  If you suspect that your compiler is not affected by this
+       # issue, comment out the NO_MMAP statement.
        NO_MMAP = YesPlease
        NO_EXTERNAL_GREP = UnfortunatelyYes
        SNPRINTF_RETURNS_BOGUS = YesPlease