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INSTALL: Add a note about backward compatibility and "make variables"

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Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5641)
This commit is contained in:
Richard Levitte 2018-03-16 10:47:36 +01:00
parent f58461791d
commit 80f2787717
1 changed files with 19 additions and 1 deletions
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20
INSTALL
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@ -536,7 +536,7 @@
these flags interact with those variables.
VAR=value
Assignment if environment variable for Configure. These
Assignment of environment variable for Configure. These
work just like normal environment variable assignments,
but are supported on all platforms and are confined to
the configuration scripts only. These assignments override
@ -587,6 +587,24 @@
./config -DFOO CPPFLAGS=-DBAR -DCOOKIE
Backward compatibility note:
To be compatible with older configuration scripts, the
environment variables are ignored if compiling / linking
flags are given on the command line, except for these:
AR, CC, CXX, CROSS_COMPILE, HASHBANGPERL, PERL, RANLIB, RC
and WINDRES
For example, the following command will not see -DBAR:
CPPFLAGS=-DBAR ./config -DCOOKIE
However, the following will see both set variables:
CC=gcc CROSS_COMPILE=x86_64-w64-mingw32- \
./config -DCOOKIE
reconf
reconfigure
Reconfigure from earlier data. This fetches the previous